Chess Problem Database Server

135 problem(s) found in 4176 milliseconds (displaying 100 problem(s)). [COMMENTDATE>=20200919 AND NOT K='Hilfsrückzüger' AND NOT K='Umwandlung' AND K='Nicht-Partiesatzmaterial'] [download as LaTeX]

1 - P0000136
Dmitri W. Pronkin
Andrey Frolkin
6631v Die Schwalbe 117 06/1989
Preis

(14+14)
BP in 57.5

1. a4 h5 2. a5 h4 3. a6 h3 4. axb7 hxg2 5. h4 d5 6. h5 d4 7. h6 d3 8. h7 dxc2 9. d4 a5 10. Lh6 c1=T 11. e4 Tc5 12. Se2 Th5 13. e5 c5 14. e6 Sc6 15. b8=T a4 16. Tb4 a3 17. Ta4 c4 18. b4 c3 19. b5 c2 20. b6 c1=T 21. b7 Tc4 22. b8=T Da5+ 23. Tbb4 Lb7 24. S1c3 0-0-0 25. exf7 e5 26. Tc1 Lc5 27. f8=T a2 28. Tf3 a1=T 29. Sa2 g1=T 30. Tfa3 Tg6 31. f4 Te6 32. f5 g5 33. f6 g4 34. f7 g3 35. f8=T g2 36. Tf5 g1=T 37. Lf8 Tg7 38. Sg3 e4 39. Ld3 e3 40. 0-0 e2 41. Tcc3 e1=T 42. Lc2 T1e3 43. d5 Tdd7 44. d6 Tdf7 45. d7+ Kb8 46. Dd6+ Ka8 47. Dc7 Sge7 48. d8=T+ Sc8 49. Tdd3 Thg8 50. h8=T Tae1 51. Th6 T1e2 52. T1f2 Tce4 53. Kf1 Ld4 54. Tfc5 Se5 55. Sf5 Sc4 56. Sd6 Sb2 57. Tbc4 Sb6 58. Db8+
play all

Der absolute KBP-Längenrekord.

See P1338946 cooked.
paul: Compare with P0002278 & P0002279 (2010-04-30)
Mu-Tsun Tsai: This one is by far the toughest retro I've ever solved. Very little certain information can be determined by structural consideration alone, even with long and complicated argument. It took me five days to complete solving this. (2012-07-22)
A.Buchanan: @Mu-Tsun: that's an interesting data point - thanks for posting. (2017-09-07)
Henrik Juel: The current record is 58.5 moves in a proof game problem by the authors + Keym, Die Schwalbe 2017 (2017-09-07)
Henrik Juel: I just learned that the 58.5 move proof game has been cooked... (2017-09-07)
A.Buchanan: In retrospect, my earlier comment about "interesting data point" is a bit weak. It's actually great that for such an extreme problem, someone took substantial time to independently validate it. It's like doing science: people want to do their own new stuff, and are unwilling to take the time to validate what's already been claimed. This one has survived 30+ years, and maybe the use of constraints e.g. in Jacobi can eventually allow it to be HC+. (2021-05-29)
Olaf Jenkner: This problem is the current record, because P1338946 (58.5 moves) has been cooked. (2021-11-25)
Reto: This is C+ up to 51.0 moves with Stelvio 2.0. This ties the record for partial testing of an SPG. Took 1200 CPU hours of strategy seeking (finding 378 0+0 strategies) and another 13h of strategy playing these strategies. If this can ever be completely solved, then it needs to be the case that all strategies have 0+0 free moves, otherwise playing is utterly hopeless.
@Andrew: There is absolutely no way a brute-force based program like Jacobi ever stands a chance at solving something like this, no matter how many conditions you add. (2023-12-14)
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Keywords: Unique Proof Game, Move Length Record, Non-standard material (TTTTTTtttttt), Castling, Aristocrat, Superseded by (P1397486)
Genre: Retro
FEN: kQ3Br1/1b3rr1/1n1Nr2R/q1R4r/R1Rbr3/R1RRr3/NnB1rR2/5K2
Reprints: 584 Ukrainisches Album 1986-1990
86 Shortest Proof Games 11/1991
(6) diagrammes 103 10-12/1992
H18 FIDE Album 1989-1991 1997
feenschach 137, p. 368, 08-09/2000
Input: Gerd Wilts, 1995-06-03
Last update: James Malcom, 2021-12-25 more...

2 - P0000684
Simo Ylikarjula
2531 Die Schwalbe 52 08/1978

(15+15) cooked
BP in 18,0

NL: 1. d4 d6 2. Kd2 Le6 3. g4 f5 4. g5 Lf7 5. g6 Sd7 6. e4 Db8 7. gxf7+ Kd8 8. Kc3 g5 9. Kc4 g4 10. Kd5 Lg7 11. Ke6 Kc8 12. f8=L g3 13. Kf7 g2 14. Ke8 gxf1=L 15. e5 Lg2 16. Se2 d5 17. Lg5 Lh3 18. e6
Die Autorlösung wurde nie publiziert und ist unbekannt.
play all

Moldenhauer: Computerprüfung: C+ NUPG cooked Stelvio 1.11 in 1 Sekunde.
Keine Lösung: BP 17.0. BP 17.5 cooked.
Beispiel BP 18.0: 1.d4 Sa6 2.Kd2 Sb8 3.Kc3 d6 4.e4 Le6 5.Se2 Sd7 6.e5 Db8 7.g4 Kd8
8.g5 f5 9.g6 Lf7 10.gxf7 Kc8 11.Kc4 g5 12.Kd5 Lg7 13.Ke6 d5 14.f8L g4 15.Kf7 g3
16.Ke8 g2 17.Lg5 gxf1L 18.e6 Lh3
Beispiel BP 17.5: 1.d4 Sa6 2.Kd2 Sc5 3.Ke3 d5 4.Kf4 Le6 5.Ke5 Kd7 6.e4 Db8
7.g4 Kc8 8.g5 f5 9.g6 Lf7 10.gxf7 Sd7+ 11.Ke6 g5 12.Se2 Lg7 13.e5 g4 14.Lg5 g3
15.f8L g2 16.Kf7 gxf1L 17.Ke8 Lh3 18.e6 (2023-05-07)
comment

Keywords: Non-Unique Proof Game, Non-standard material
Genre: Retro
FEN: rqk1KBnr/pppnp1bp/4P3/3p1pB1/3P4/7b/PPP1NP1P/RN1Q3R
Input: Gerd Wilts, 1995-06-03
Last update: A.Buchanan, 2014-05-20 more...

3 - P0000763
Lothar Finzer
1159 Die Schwalbe 24 12/1973

(12+12) C+
#3

Schwarz hat keinen letzten Zug, daher beginnt er (und setzt in 3 Zügen matt):
1. ... T3d2+ 2. Lexd2 Txd2+ 3. Lxd2 Ta1#,Db3#; 3. Lb2 Txb2#,Db3#; 3. Kb1 Txc1#
Verführung: 1. Ta5+? Kxb4 2. Sc6+ Kc4 3. Tc5#
play all

Die Umwandlung aller 16 Bauern in schwarzfeldrige Läufer bzw. in Türme erforderte alle 8 Schlagfälle, und zwar so, daß alle Umwandlungsfiguren auf schwarzen Feldern entstanden. Deshalb kann zuletzt auch keine schwarze UW erfolgt sein.

Joaquim Crusats: Can anyone explain the intention? (2013-01-06)
Henrik Juel: The eight white pawns captured the four missing black officers and promoted on b8, d8, f8, and h8; the eight black pawns captured the four missing white officers and promoted on a1, c1, e1, and g1.
If White had the move, 1.Ta5+? Kxb4 2.Sc6+ Kc4 3.Tc5 would mate in three.
But Black has no last move, so he has the move and mates in three by 1... T3d2+ 2.Lexd2 Txd2+ 3.Kb1 Txc1# (2013-01-06)
A.Buchanan: This is one of a number of problems which had been given both "No legal last move for..." & "Whose move?" keywords. These should correspond respectively to two situations: (1) Codex Article 15 where we add or remove a single move from the beginning of the solutions, but the mating party remains the same. (2) A kind of one-sided duplex, where who moved last implies who delivers the mate (or other final move).
So at most one of the two keyword forms can ever logically apply to a problem. Therefore I have removed the incorrect "No legal last move for Black" keyword.
We might replace "Whose move?" by "Halfduplex", which is related to the Popeye option. What do you think? (2023-11-28)
A.Buchanan: This is a nice problem. There are some final move duals for the actual solution, but all missing units are needed to justify promotions (2023-11-28)
Henrik Juel: Halfduplex is a bit too technical for my taste, although it describes the goings on well (2023-11-28)
A.Buchanan: Thanks Henrik - I'll leave the term "Whose move?" as it is then. (2023-11-28)
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comment

Keywords: Non-standard material (LLLLLLLLtttttttt), Whose move?, Aristocrat
Genre: Retro, 3#
Computer test: HC+ Popeye v4.87 (subject to final move duals) with simple retro logic
FEN: 8/N7/8/2R1B1B1/kB1BrBrB/2qrrrrr/K7/2BrBrBr
Input: Gerd Wilts, 1995-06-03
Last update: A.Buchanan, 2023-11-28 more...

4 - P0001641
Francois Brassaud
510 Europe Echecs 367/368 07/1989
A. Hazebrouck gewidmet

(13+14) cooked
KBP?

1. h4 e5 2. h5 Ke7 3. h6 Kd6 4. hxg7 Kc5 5. Th6 Kb4 6. Tc6 h5 7. e4 h4 8. Ke2 h3 9. Kf3 Th4 10. Le2 Sh6 11. g8=L f6 12. Lb3 h2 13. c4 h1=S 14. Dc2 Sg3 15. fxg3 a5 16. g4 a4 17. g5 axb3 18. g6 bxc2 19. g7 cxb1=T 20. g8=D
play all

Cook: 1. c2-c4 a7-a6 2. e2-e4 e7-e6 3. f2-f4 h7-h5 4. Dd1xh5 Ke8-e7 5. Dh5-b5 Th8-h4 6. Ke1-e2 Th4-g4 7. h2-h4 a6xb5 8. h4-h5 b5-b4 9. h5-h6 Ke7-d6 10. h6-h7 Kd6-c5 11. Th1-h6 Tg4-h4 12. h7-h8=D g7-g6 13. Dh8-c3 b4xc3 14. Ke2-f3 c3-c2 15. f4-f5 c2xb1=T 16. f5xg6 Kc5-b4 17. g6-g7 e6-e5 18. Th6-c6 f7-f6 19. Lf1-e2 Sg8-h6 20. g7-g8=D (H. Juel)

more ...
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Keywords: Allumwandlung, Ceriani-Frolkin Theme (Ls), Unique Proof Game, Non-standard material
Genre: Retro
Computer test: Euclide 1.01 Moldenhauer: Computerprüfung: Cooked Stelvio 1.11 2 Sekunden. Keine Lösung: BP 18.5, BP 19.0. KBP = 19.5.
FEN: rnbq1bQ1/1ppp4/2R2p1n/4p3/1kP1P2r/5K2/PP1PB1P1/RrB3N1
Reprints: 135 Shortest Proof Games 11/1991
Input: Gerd Wilts, 1995-06-03
Last update: A.Buchanan, 2023-04-15 more...

5 - P0001870
Dmitri W. Pronkin
Rex Multiplex 1985
3. ehrende Erwähnung

(14+10)
BP in 29,5

1. Sf3 e5 2. Sd4 Dg5 3. Sc6 De3 4. fxe3 h5 5. Kf2 h4 6. De1 h3 7. Kg3 Th4 8. Df2 Ta4 9. Df4 hxg2 10. h4 dxc6 11. h5 Sd7 12. h6 Sb6 13. h7 Ld7 14. h8=T 0-0-0 15. T8h6 Le8 16. Tf6 Tdd4 17. exd4 Lc5 18. dxc5 g1=L 19. cxb6 Lc5 20. bxa7 La3 21. bxa3 g5 22. Lb2 g4 23. Kh4 g3 24. Ld4 g2 25. Sc3 g1=S 26. Tb1 Sh3 27. Tb6 Sf2 28. Ta6 Sd1 29. Lf2 b6 30. a8=D+
play all

Moldenhauer: Computerprüfung: C+ Stelvio 2.0 02:29:09 Stunden. (hh:mm:ss) (2023-12-23)
comment

Keywords: Ceriani-Frolkin Theme (Tls), Unique Proof Game, Non-standard material, Castling, Allumwandlung (DTls)
Genre: Retro
FEN: Q1k1b1n1/2p2p2/Rpp2R2/4p3/r4Q1K/P1N5/P1PPPB2/3n1B1R
Reprints: 136 Shortest Proof Games 11/1991
Input: Gerd Wilts, 1995-06-03
Last update: Kevin Begley, 2011-05-18 more...

6 - P0003969
Roger Diot
André Hazebrouck
RA163 diagrammes 73 09-10/1985

(12+12)
#1
KBP?

Henrik Juel: 1... Txa2#, not 1.Dxb2? -1.Td1xSe1 Sf3 -2.Te1 h7 -3.Td1 Sh4 -4.Te1 Sf5 -5.Td1 Sh6 -6.Te1 Sg4xPh6 -7.Td1 Sf2 -8.Te1 Sd1 -9.h5 Kc1 -10.h4 Ld3 -11.h3 Kc2 -12.h2 Sf2 -13.Td1, retract sLd3 to c8, b7-b6, etc. Black promoted b2-b1=T and f2xTg1=L. The shortest proof game is rather long! (2003-12-19)
Moldenhauer: Histogramm Stelvio 1.2 128/0k bei BP 37.0.
Kein Histogramm bei BP 36.0, BP 36.5. Computerprüfung wird sehr lange dauern
da eine 5+1 auch nach 5 Stunden noch nicht fertig ist! Nur 49 Strategien sind
unter 5+1. Vielleicht kommt aber das "cooked" früher dazwischen. (2023-05-10)
comment

Keywords: Whose move?, Non-standard material, Non-Unique Proof Game
Genre: Retro
FEN: N7/2Pp2p1/1prp3p/b1p5/1b6/PPP5/QrkPP1P1/Kb2RB2
Input: Gerd Wilts, 1995-06-03
Last update: A.Buchanan, 2014-05-21 more...

7 - P0004199
Werner Frangen
Problem 41-44, p. 52, 03/1957

(14+10) cooked
#5

1. axb6ep+ Kb5 2. bxc7+ Tb6 3. 0-0-0 ...
play all

K. Fabel: "Von Interesse ist, dass diese strittige Idee [Beweis des e.p.-Schlagrechts durch spätere Ausführung der Rochade] auch im direkten Mattproblem dargestellt werden kann, vergl. das Diagramm [diese Aufgabe P0004199]. (Vielleicht ist diese Aufgabe noch nicht korrekt doch es wird nicht schwer sein, sie zu verbessern). Falls Schwarz zuletzt Bb6-b5, Tb6-c6 oder Lb6-c7 gezogen hat, ergibt sich, dass Weiss im letzten oder vorletzten Zug den K oder T bewegt haben muss. Falls jedoch K und T noch nicht gezogen haben, muss b7-b5 der letzte Zug gewesen sein. Weiss spielt daher 1. ab6e.p.+ Kb5 2. bc7+ Tb6. Jetzt könnte Weiss mit Dxb6 sofort mattsetzen, aber er muss ja den e.p.-Schlag noch legalisieren. Daher 3. 0-0-0! und Matt erst im 5. Zuge."
Cook: 1. Sxc7+!
1. Lxc7!

Innerhalb des 2. Teils einer Artikelserie "Die Konventionen im Problemschach" von Karl Fabel.
A.Buchanan: The retro logic is fine, but forward play is savagely cooked. I wonder about changing wSc8 to sS. The retro stuff still works OK, indeed sSc8 is a fourth thematic unit to retract in the try. Ignoring proof of ep legality, there is a unique #4 beginning with ep, and no #5. Promising: but when can we interpolate w000? Any solution must begin 1. axb6ep+ Kb5. There are now numerous #4, but none include w000, so I think we must stick with the still unique line beginning 2. Dxc8 thr 3. 0-0-0. There are 3 black defenses to refute this. 2. ... Txb6,axb3,d5. So maybe #6 needed for White to prevail? (2022-03-28)
A.Buchanan: But if we shift to #6 then 1. Sxc7!,Qxc8+! mate without ep. Can anyone retrieve the original diagram for this one, please? (2022-03-28)
Mario Richter: The position here is identical to the original diagram, but it should be regarded more as a schematic example than a "real problem". Fabel in his quote above: "... perhaps the problem is still not correct, but it should be easy to improve it ..." (2022-03-28)
Henrik Juel: unfortunately K. Fabel forgot to give the easy correction... (2022-03-28)
A.Buchanan: Thanks for this. Valery Liskovetz, an AP expert, was kind enough to send a pdf of the relevant Problem issue, so I can confirm. It's easy enough to remove the two cooks (e.g. sTc8) but the difficulty is in validation of the intended solution. Is there any "exact" option in Popeye that forces the solution to include a waiting move? The actual solution might be expected to be included in that set. (2022-03-29)
Henrik Juel: Yes, Andrew
'stip exact-#5' would disregard #4 as a solution, I believe (2022-03-29)
A.Buchanan: Even with the "exact", it's still very complicated to investigate. I think this kind of problem requires an engine feature to disallow any mate or pat if the specified castling has not been executed. Gazing at the 20,000 lines of output, I don't think sTc8 works as 1. axb6ep+ Kb5 2. Qb7 bxa3! threatens axb2+ after castling. I wonder if the board might be flipped left-right except for wK, but I haven't explored this. (2022-05-31)
comment

Keywords: a posteriori (AP) (Type Petrovic), En passant as key, Castling (wg), Non-standard material (TLL)
Genre: Retro, n#
FEN: NQNB4/B1brpp2/k1rp4/Ppp5/Rp6/BP6/RPP5/R3K3
Reprints: (8) Problem 101-102 09/1966
(52) Problem 144-147 12/1971
Input: Gerd Wilts, 1995-06-03
Last update: A.Buchanan, 2022-03-29 more...

8 - P0005649
Andrey Frolkin
(10) Die Schwalbe 59 10/1979

(12+10)
Ist die Rochade zulässig?

R: 0-0! Kb6xc7 1. Ld8xc7+ Lf4-d6 2. Sb1-a3 De5-c7 3. Lg5-d8+ Da1-e5 3. Sd2-b1 Dc3-a1+ 4. Sf1-d2 Dg3-c3+ 5. Lf6-g5 Ld6-f4 6. Lc3-f6 Lb4-d6 7. c7xDb8=T Dg1-g3 8. Sg3-f1 g2-g1=D+ 9. Se4-g3 g3-g2 10. d6xDc7 g4-g3 11. Sd2-e4 g5-g4 12. Sf1-d2 g7-g5 13. d5-d6 Dg3-c7 14. Ld2-c3 Dg1-g3 15. Se3-f1 g2-g1=D+ 16. Lc3-d2 g3-g2 17. Sf1-e3 g4-g3 18. Sg3-f1 g5-g4 19. Se4-g3 g6-g5 20. Sd2-e4 h7xSg6 21. c7xDb8=T Lb4-a3 22. d6xDc7 Dg8-d8 23. Sf1-d2 Dg1-g8 24. Sg3-f1 g2-g1=D+ 25. Se4-g3 g3-g2 26. Sd2-e4 g4-g3 27. d5-d6 Dg3-c7 28. Sf1-d2 Dg1-g3 29. Se3-f1 g2-g1=D+ 30. Sf5-e3 g5-g4 31. Sd4-f5 g3-g2 32. Sb3-d4 Kc5-b6 33. Sd2-b3+ g4-g3 34. Sf1-d2 Dg3-b8 35. Tb8-a8 g7-g5 36. c7xDb8=T g5-g4 37. b6xDc7 Dg1-g3 38. Se3-f1 g2-g1=D+ 39. Sc4-e3 g6-g5 40. Sa3-c4 g3-g2 41. Sb1-a3 g4-g3 42. Sd2-b1 Dg3-c7 43. Sf1-d2 Dg1-g3 44. Ld2-c3 g2-g1=D 45. Lc3-d2 f3xLg2 46. Se3-f1 e4xTf3 47. Sc4-e3 Kd6-c5 48. Sa3-c4+ h7xSg6 49. Sb1-a3 Ke7-d6 50. Sf4-g6+ Ke8-e7 51. Lf1-g2 f5xDg4 52. g2xTh3 Th6-h3 53. Sd2-b1 e5-e4 54. Lb2-c3 Tf6-h6 55. Tc3-f3 Tf8-f6 56. Sh3-f4 Th8-f8 57. Sg1-h3 f7-f5 58. Sc4-d2 Sc5-a4 59. Sa3-c4 Se4-c5 60. Td3-c3 Lf8-b4+ 61. Td1-d3 Sf6-e4 62. Ta1-d1 Sg8-f6 63. Sb1-a3 e7-e5 64. Lc1-b2 Dc7-b8 65. b5-b6 Dd8-c7 66. b4-b5 c7-c6 67. b2-b4 Sc6-a5 68. Dd4-g4 Sb8-c6 69. Dd1-d4 Ta8-a7 70. d4-d5 a7-a6 71. d2-d4
play all

hans: 4 Q-promotions on g1 and captured on b8 and c7. Sf1 for shield, so 0-0 is legal. (2010-04-30)
Hans-Jürgen Manthey: R: 0. O-O ! Kb6xc7 1. Ld8xc7+ Lf4-d6 2. Sb1-a3 De5-c7 3. Lg5-d8+ Da1-e5 3. Sd2-b1 Dc3-a1+ 4. Sf1-d2 Dg3-c3+ 5. Lf6-g5 Ld6-f4 6. Lc3-f6 Lb4-d6 7. c7xDb8=T Dg1-g3 8. Sg3-f1 g2-g1=D+ 9. Se4-g3 g3-g2 10. d6xDc7 g4-g3 11. Sd2-e4 g5-g4 12. Sf1-d2 g7-g5 13. d5-d6 Dg3-c7 14. Ld2-c3 Dg1-g3 15. Se3-f1 g2-g1=D+ 16. Lc3-d2 g3-g2 17. Sf1-e3 g4-g3 18. Sg3-f1 g5-g4 19. Se4-g3 g6-g5 20. Sd2-e4 h7xSg6 21. c7xDb8=T Lb4-a3 22. d6xDc7 Dg8-d8 23. Sf1-d2 Dg1-g8 24. Sg3-f1 g2-g1=D+ 25. Se4-g3 g3-g2 26. Sd2-e4 g4-g3 27. d5-d6 Dg3-c7 28. Sf1-d2 Dg1-g3 29. Se3-f1 g2-g1=D+ 30. Sf5-e3 g5-g4 31. Sd4-f5 g3-g2 32. Sb3-d4 Kc5-b6 33. Sd2-b3+ g4-g3 34. Sf1-d2 Dg3-b8 35. Tb8-a8 g7-g5 36. c7xDb8=T g5-g4 37. b6xDc7 Dg1-g3 38. Se3-f1 g2-g1=D+ 39. Sc4-e3 g6-g5 40. Sa3-c4 g3-g2 41. Sb1-a3 g4-g3 42. Sd2-b1 Dg3-c7 43. Sf1-d2 Dg1-g3 44. Ld2-c3 g2-g1=D 45. Lc3-d2 f3xLg2 46. Se3-f1 e4xTf3 47. Sc4-e3 Kd6-c5 48. Sa3-c4+ h7xSg6 49. Sb1-a3 Ke7-d6 50. Sf4-g6+ Ke8-e7 51. Lf1-g2 f5xDg4 52. g2xTh3 Th6-h3 53. Sd2-b1 e5-e4 54. Lb2-c3 Tf6-h6 55. Tc3-f3 Tf8-f6 56. Sh3-f4 Th8-f8 57. Sg1-h3 f7-f5 58. Sc4-d2 Sc5-a4 59. Sa3-c4 Se4-c5 60. Td3-c3 Lf8-b4+ 61. Td1-d3 Sf6-e4 62. Ta1-d1 Sg8-f6 63. Sb1-a3 e7-e5 64. Lc1-b2 Dc7-b8 65. b5-b6 Dd8-c7 66. b4-b5 c7-c6 67. b2-b4 Sc6-a5 68. Dd4-g4 Sb8-c6 69. Dd1-d4 Ta8-a7 70. d4-d5 a7-a6 71. d2-d4 (2021-07-17)
comment

Keywords: Ceriani-Frolkin Theme, Castling, Non-standard material
Genre: Retro
FEN: RRb5/rpBp4/pkpb4/n7/n7/N6P/P1P1PP1P/4K2R
Reprints: (17) diagrammes 15 07-09/1994
Input: Gerd Wilts, 1995-06-06
Last update: James Malcom, 2021-07-17 more...

9 - P0005906
Unto Heinonen
R202v The Problemist 05/1992
2. Preis

(12+15) C+
BP in 26.0

1. Sf3 a5 2. Sd4 a4 3. Sb3 axb3 4. Sc3 bxc2 5. Se4 cxd1=L 6. Sg5 Lb3 7. Sxh7 Lc4 8. Sg5 Th5 9. Sh7 Tha5 10. Kd1 d5 11. Kc2 Kd7 12. Kc3 Ke6 13. Kd4 Kf5 14. Ke3 Le6 15. Kf3 Sd7 16. Kg3 Tc8 17. Kh4 g5+ 18. Kh3 Lg7 19. Kg3 Le5+ 20. Kf3 Ld6 21. Ke3 Kg4 22. Kd4 c5+ 23. Kc3 Db6 24. Kc2 Db4 25. Kd1 b5 26. Ke1 Dxd2+
play all

paul: Correction of P1001275 (2010-05-08)
A.Buchanan: Does it have to end in a check which is in some sense a defect if unnecessary. Can it be 24. … Db3+ 25. Kd1 b5 26. Ke1 b4 (2023-06-13)
Joost de Heer: 24... Qb3+ 25. Kd1 is illegal. (2023-06-13)
A.Buchanan: Well clearly 24... Qxb2+ then same idea (2023-06-13)
comment

Keywords: Unique Proof Game, Promenade (K), Non-standard material, Tempo Loss (K17)
Genre: Retro
Computer test: Stelvio 1.33, 1min
FEN: 2r3n1/3npp1N/3bb3/rppp2p1/2b3k1/8/PP1qPPPP/R1B1KB1R
Reprints: 3388 U.S. Problem Bulletin 102/103 07-10/1995
Input: Gerd Wilts, 1995-06-26
Last update: Reto, 2023-06-12 more...

10 - P0005911
Unto Heinonen
2375 U.S. Problem Bulletin 01-02/1992

(13+16) cooked
BP in 34,5

1. Sc3 h5 2. Se4 h4 3. Sg3 hxg3 4. h4 Th5 5. Th2 gxh2 6. Tb1 hxg1=S 7. Ta1 Sh3 8. Tb1 Sf4 9. Ta1 Sd5 10. Tb1 Sb4 11. Ta1 Td5 12. Tb1 g5 13. Ta1 Lg7 14. Tb1 Ld4 15. Ta1 Lb6 16. Tb1 c5 17. Ta1 Dc7 18. Tb1 De5 19. Ta1 Ld8 20. Tb1 b6 21. Ta1 La6 22. Tb1 Lc4 23. Ta1 a6 24. Tb1 Ta7 25. Ta1 Tc7 26. Tb1 Tc6 27. Ta1 Tf6 28. Tb1 d6 29. Ta1 Kd7 30. Tb1 Ke6 31. Ta1 Kf5 32. Tb1 Kg4 33. Ta1 Tf5 34. Tb1 Sf6 35. Ta1
play all

Korrektur siehe P0008426.
James Malcom: What is the cook? (2023-05-02)
more ...
comment

Keywords: Unique Proof Game, Non-standard material, Pendulum (T x30), Superseded by (P0008426)
Genre: Retro
FEN: 1n1b4/4pp2/pp1p1n2/2prqrp1/1nb3kP/8/PPPPPPP1/R1BQKB2
Reprints: (12) feenschach 117 11/1995
Input: Gerd Wilts, 1995-06-26
Last update: James Malcom, 2023-05-02 more...

11 - P0006242
Harold Holgate Cross
5553 FEENSCHACH 09-10/1961

(12+15)
#1
b) Be2 nach e3

Mario Richter: vgl. P1011972 (dort sLa3 statt sTa3) (2020-09-23)
comment

Keywords: Castling, Non-standard material
Genre: Retro
FEN: 8/2ppp2p/1p6/1p6/brPN4/rqP3PP/nbrPPP1r/RNk1K2R
Input: Gerd Wilts, 1995-08-14
Last update: Gerd Wilts, 2004-09-12 more...

12 - P0006632
Anatolii Vasylenko
(2) Die Schwalbe 159, p. 364, 06/1996
2. Preis Ceriani-Gedenkturnier, 2. Abteilung

(6+2)
#2
UW-Figuren in der Diagrammstellung sind 1) zulässig 2) unzulässig

1) 1. Tc8 Kxf8 2. Lf6#
2) 1. ... Kxd8 2. Kf7 g6 3. Se6# 1. ... Kxf8 2. Te7 Kg8 3. Te8#
play all

Henrik Juel: C+ Popeye 4.61
It is obvious that if Ld8 is not a promoted pawn then Black has the move (2021-12-26)
more ...
comment

Keywords: Non-standard material, Minimal, Homebase, No legal last move for Black
Genre: Retro, 2#
FEN: 3BkN2/2R3p1/1P4K1/6P1/8/8/8/8
Reprints: 3 Problemist Yuga 3-4, p. 37, 01-06/1997
feenschach 137 08-09/2000
Input: Gerd Wilts, 1996-07-11
Last update: A.Buchanan, 2021-12-27 more...

13 - P0006638
Alexander Hildebrand
(37) Die Schwalbe 159, p. 366, 06/1996
2. Lob Ceriani-Gedenkturnier, 2. Abteilung

(5+2)
#2
UW-Figuren in der Diagrammstellung sind 1) zulässig 2) unzulässig

1) 1. Lxg1 Kxg1 2. Ta1#
2) 1. ... Lxh2 2. Txh2+ Kg1 3. Ta1#
1. ... Lf2+ Kxf2 2. Kxh2 Th8#
1. ... Lxe3 2. Ta1+ Lg1 3. Txg1#
play all

Henrik Juel: C+ Popeye 4.61 (2022-01-02)
comment

Keywords: Non-standard material, Minimal, Miniature, No legal last move for Black
Genre: Retro
FEN: R7/8/8/8/8/4P1K1/R6B/6bk
Input: Gerd Wilts, 1996-07-11
Last update: Mario Richter, 2022-01-02 more...

14 - P0006639
Alexander Hildebrand
(40) Die Schwalbe 159, p. 366, 06/1996
3. Lob Ceriani-Gedenkturnier, 2. Abteilung

(5+2)
#1
UW-Figuren in der Diagrammstellung sind 1) zulässig 2) unzulässig

1) 1. Se3#
2) 1. ... Txf1 2. Tfg3#, 1. ... Txh1 2. Thg3#
play all

Henrik Juel: C+ Popeye 4.61 (2022-01-02)
comment

Keywords: Non-standard material, Aristocrat, Minimal, Miniature, No legal last move for Black
Genre: Retro
FEN: 8/8/6K1/8/8/5R1R/6k1/5NrN
Input: Gerd Wilts, 1996-07-11
Last update: Mario Richter, 2022-01-02 more...

15 - P0007793
Gerd Wilts
1318 Rochade Europa 09/1996
2. ehrende Erwähnung
Informalturnier 1996-1997
Übriges Märchenschach

(13+13)
Welches waren die letzten 25 Einzelzüge?

R: 1. Sc5-b7+ f2-f3 2. Sa6-c5 c6-c7 3. Sc7-a6+ c5-c6 4. f6-f5 c4-c5 5. f7-f6 c2-c4 6. c4xTb3 Tc3-b3 7. c5-c4 b3-b4 8. c6-c5 Lb4-a3 9. a3-a2 Tc5-c3 10. a4-a3 Th5-c5 11. b5xLa4 Th8-h5 12. b6-b5 h7-h8=T 13. b7-b6
play all

PR Jörg Kuhlmann 03/1999

Henrik Juel: Next retraction is not unique: 13... g6xTLh7 (2020-11-26)
comment

Keywords: Ceriani-Frolkin Theme, Last Moves?, Non-standard material
Genre: Retro
FEN: 1bRqrb2/pnPRn1p1/3Kp3/P4p2/1P1k4/Bp1P1P2/p2P2P1/2N1N3
Input: Gerd Wilts, 1996-09-03
Last update: Marcin Banaszek, 2020-11-26 more...

16 - P0008537
Michel Caillaud
615v Europe Echecs 452 01/1997

(14+9) C+
BP in 21,5

1. d3! Sc6 2. d4 Se5 3. dxe5 Sf6 4. exf6 Tg8 5. fxg7 f6! 6. gxf8=S Tg3 7. hxg3 f5 8. Th6 f4 9. Td6 exd6 10. Se6 Dh4 11. Sc5 Dh3 12. gxh3 h6! 13. Lg2 h5 14. Lc6 dxc6 15. Kf1 Le6 16. Kg2 Lb3 17. axb3 0-0-0 18. Ta6 Td7 19. Tb6 a6! 20. Sa4 a5 21. Ta6 c5 22. Ta8#
play all

Vladimir Rey: C+ Natch 3.2 - Solution found: 1. Positions analysed: 51578. Resolution time: 5 h 33 mn 32.84 s. (2020-05-08)
Vladimir Rey: Check please: Keywords Tempo Loss. (2022-09-05)
comment

Keywords: Unique Proof Game, Castling, Tempo Loss (Bbb), Non-standard material (S), Cross-capture
Genre: Retro
Computer test: Natch 3.2
FEN: R1k5/1ppr4/3p4/p1p4p/N4p2/1P4PP/1PP1PPK1/1NBQ2N1
Reprints: H14 FIDE Album Annexe 1995-1997 2004
Input: Gerd Wilts, 1997-01-02
Last update: A.Buchanan, 2020-05-08 more...

17 - P0008800
Andrey Frolkin
9650 Die Schwalbe 165 06/1997
1.-2. Preis ex aequo

(14+15) C+
KBP?
UWF sind in der Diagrammstellung
a) erlaubt
b) nicht erlaubt

a) 1. d4 e5 2. Lf4 Dg5 3. e3 f6 4. La6 bxa6 5. h4 Lb7 6. h5 Lxg2 7. h6 Lh3 8. hxg7 h5 9. Se2 Sh6 10. g8=L Lg7 11. Ld5 Tf8 12. Lb7 Sc6 13. Tf1 Td8 14. Lc8 Kf7
b) 1. h4 e5 2. h5 Dg5 3. h6 f6 4. hxg7 h5 5. d4 Sh6 6. g8=L Lg7 7. Lc4 Tg8 8. La6 bxa6 9. Lf4 Lb7 10. e3 Lxg2 11. Se2 Lh3 12. Lg2 Kf7 13. Lb7 Sc6 14. Tf1 Td8 15. Lc8
play all

Moldenhauer: Computerprüfung: a) C+ Stelvio 1.11 1 Sekunde.
Keine Lösung: BP 13.0, BP 13.5. KBP = 14.0.
b) Stelvio 1.11 hat noch keine Funktion dafür.
Die Lösung zu b) ist wegen 6. g8=L nicht korrekt. (2023-05-10)
Henrik Juel: The given solution to part b) is (probably) correct
During the play White promotes to L, but this L is captured later, so it is not in the diagram position (2023-05-10)
Moldenhauer: Danke Henrik Juel! Der Läufer ist wieder geschlagen worden und somit nicht in der Diagrammstellung.
Das Schlüsselwort "Non-standard material" deutet auch darauf hin. Also Lösung b) korrekt! (2023-05-10)
comment

Keywords: Unique Proof Game, Non-standard material
Genre: Retro
FEN: 2Br1r2/p1pp1kb1/p1n2p1n/4p1qp/3P1B2/4P2b/PPP1NP2/RN1QKR2
Reprints: Die Schwalbe 193 02/2002
Input: Gerd Wilts, 1997-06-23
Last update: Gerd Wilts, 2004-08-09 more...

18 - P0008879
Arpad Molnar
R259 The Problemist 01/1997

(10+9) cooked
Welches waren die letzten 16 Einzelzüge?

Cook: R: 1. a4xSb3+ Lb8-c7 2. d6xSc5 Ld8-b6 3. b6xSa5 e7xTd8=L

Gerald Ettl: Weiss jemand wie die Autorloesung geplant war? (2023-09-28)
comment

Keywords: Last Moves? (16), Non-standard material
Genre: Retro
FEN: 8/p1Bp1ppp/RBR5/pBpP4/1kP5/Rp6/1PK5/8
Input: Gerd Wilts, 1998-06-26
Last update: Gerd Wilts, 2006-10-08 more...

19 - P0008935
Tivadar Kardos
Arpad Molnar
3217 Probleemblad 05/1997

(16+10) C+
#1

1. ... Sxb6 Sxc7#
1. ... axb6 Dxa8#
1. ... bxa6 Tb8#
1. ... bxc6 Dc8#
1. ... cxb6 Sxd6#
1. ... dxc5 Td8#
1. ... d5 f7#
1. ... Sxe7 Txe7#
1. ... Sxf6 Sxf6#
1. ... Dxg7 Sxg7#
1. ... Dxh7 gxh7#
1. ... Dxg6 Lxg6#
1. ... Dxh5 Txg8#
play all

BTM but for every move there’s a unique mate

A.Buchanan: This one is really nice (2021-11-26)
more ...
comment

Keywords: Non-standard material (TT), No legal last move for Black
Genre: Retro
Computer test: C+ Popeye v4.87 edit
FEN: n3k1n1/ppp1P1RR/QRPpNPPq/1PB1pKpB/4N1P1/3R4/8/8
Input: Gerd Wilts, 1998-06-26
Last update: A.Buchanan, 2021-11-26 more...

20 - P0009046
Peter Wong
9923 Die Schwalbe 169 02/1998
4. Preis

(15+14) C+
BP in 23.0

1. e4 a5 2. Ke2 a4 3. Kf3 a3 4. Kg4 axb2 5. a4 Ta6 6. a5 Ta7 7. a6 Ta8 8. a7 Sc6 9. Ta6 Sb8 10. Th6 g6 11. axb8=S Lg7 12. Sa6 Lc3 13. dxc3 Kf8 14. Dd4 De8 15. Da4 Kg7 16. Lc4 Df8 17. Se2 Dd8 18. Td1 Kf8 19. Td6 Ke8 20. Tf6 e6 21. Sd2 Se7 22. Sf3 Sc6 23. Sfg1 Sb8
play all

Je 3zügiger Tempoverlust von sTa8 und sDd8, dazu Platzwechsel (wSb1 nach g1, sSg8 nach b8) und Switchback (sSb8 und sKe8). Hervorragend!

Moldenhauer: Computerprüfung: C+ Stelvio 1.11 in 1 Sekunde.
Keine Lösung: BP 22.0, BP 22.5. (2023-03-27)
comment

Keywords: Unique Proof Game, Non-standard material, Switchback (sk), Tempo Loss (t3s2d3), Impostor (Ss)
Genre: Retro
Computer test: Stelvio 1.11
FEN: rnbqk2r/1ppp1p1p/N3pRpR/8/Q1B1P1K1/2P5/1pP1NPPP/2B3N1
Reprints: feenschach 141 06/2001
(70) Parallel Strategy 2004
H52 FIDE Album 1998-2000 2007
Input: Gerd Wilts, 1998-06-26
Last update: Silvio Baier, 2023-04-05 more...

21 - P1000172
Andrey Frolkin
Andrej N. Kornilow
9 Die Schwalbe 169, p. 342, 02/1998
3. Preis

(14+14) cooked
KBP?

1. a4 h5 2. a5 h4 3. a6 h3 4. axb7 hxg2 5. h4 a5 6. h5 a4 7. h6 a3 8. h7 a2 9. Th6 Ta3 10. Sh3 Sa6 11. b8=D g1=D 12. Db4 Dg5 13. Dh4 Da5 14. b4 g5 15. 15. b5 g4 16. b6 g3 17. b7 g2 18. b8=D g1=D 19. Dbb4 Dgg5 20. Dbg4 Dgb5 21. c4 f5 22. Tf6 Tc3 23. dxc3 exf6 24. Le3 Ld6 25. Sd2 Se7 26. Tb1 Tg8 27. h8=S a1=S 28. Sg6 Sb3 29. Sgf4 Sbc5 30. Sg2 Sb7 31. f4 c5 32. Lg1 Lb8 33. e3 d6 34. Le2 Ld7 35. Sf1 Sc8 36. Dd2 De7 37. Kd1
play all

Cook: NL
1. d3 a5 2. Le3 a4 3. Sd2 a3 4. g4 Ta4 5. g5 Tc4 6. dxc4 b5 7. g6 b4 8. gxh7 b3 9. h4 bxa2 10. b4 e6 11. b5 g5 12. b6 g4 13. b7 g3 14. h5 g2 15. h6 Sa6 16. Th5 f6 17. Tb1 a1=S 18. Sh3 g1=D 19. b8=D Dg5 20. c3 Db5 21. Tf5 c5 22. Df4 Ld6 23. Dg4 Lb8 24. f4 Se7 25. Lg1 a2 26. e3 Sb3 27. Le2 a1=D 28. Sf1 Sa5 29. Dd2 Sb7 30. Kd1 Tg8 31. h8=S Da5 32. Sg6 exf5 33. Sh4 d6 34. Sg2 Ld7 35. h7 Sc8 36. h8=D De7 37. Dh8-h4 (Henrik Juel)

Moldenhauer: Computerprüfung: Cooked Stelvio 1.31 00:06:21 Minuten. (hh:mm:ss)
Keine Lösung: BP 36.0.
Beispiel Stelvio: 1.c3 a5 2.d3 a4 3.Le3 a3 4.Sd2 Ta4 5.Tb1 Tc4 6.dxc4 Sa6 7.g4 b5
8.g5 b4 9.g6 b3 10.gxh7 bxa2 11.b4 a1=S 12.b5 a2 13.b6 Sb3 14.h4 g5 15.h5 g4
16.h6 g3 17.Th5 g2 18.Sh3 g1=D 19.b7 Dg5 20.b8=D Db5 21.Tf5 c5 22.Df4 a1=D 23.Dg4 Sa5
24.f4 Sb7 25.Lg1 Daa5 26.e3 e6 27.Le2 Ld6 28.Sf1 Lb8 29.Dd2 Se7 30.Kd1 Tg8
31.h8=S d6 32.Sg6 Ld7 33.Sh4 Sc8 34.Sg2 De7 35.h7 f6 36.h8=D exf5 37.Dhh4 (2023-06-20)
more ...
comment

Keywords: Unique Proof Game, Symmetrical position, Non-standard material, Symmetrical solution
Genre: Retro
FEN: 1bn1k1r1/1n1bq3/n2p1p2/qqp2p2/2P2PQQ/2P1P2N/3QB1N1/1R1K1NB1
Reprints: feenschach 141 06/2001
Input: Gerd Wilts, 2000-08-01
Last update: Alfred Pfeiffer, 2018-12-19 more...

22 - P1000634
Michel Caillaud
R081 Probleemblad 03-04/2000

(12+13) C+
BP in 40,5

1. d4 h5 2. d5 h4 3. d6 h3 4. dxc7 hxg2 5. h4 a5 6. h5 a4 7. h6 a3 8. h7 axb2 9. hxg8=T Th4 10. a4 Tg4 11. Thh8 Ta5 12. Sh3 Tah5 13. a5 d5 14. a6 d4 15. a7 Dd5 16. a8=T Sd7 17. Tb8 g1=L 18. Taa8 Lh2 19. Sa3 b1=T 20. e4 Tb6 21. e5 Tbh6 22. e6 Sb6 23. exf7+ Kd7 24. c4 e5 25. c5 Ld6 26. f8=T e4 27. Te8 Ldg3 28. c6+ Kd6 29. Lb5 Le6 30. c8=T e3 31. c7 e2 32. Ld7 exd1=L 33. Kf1 d3 34. f4 d2+ 35. f5 dxc1=D 36. f6 De3 37. f7 La4 38. f8=T Lf7 39. Tcd8 D3e6 40. c8=T Lb5+ 41. Sc4+
play all

Henrik Juel: Natch 3.1 found nothing in an hour (2018-12-14)
more ...
comment

Keywords: Unique Proof Game, Non-standard material (TTTTTTtlld), Ornament
Genre: Retro
Computer test: C+ in about 56h using Stelvio 1.11 and lots of RAM (Reto)
FEN: RRRRRRRR/1p1B1bp1/1n1kq2r/1b1q3r/2N3r1/6bN/7b/5K2
Reprints: H37 FIDE Album Annexe 1998-2000 2009
Input: Gerd Wilts, 2000-08-01
Last update: A.Buchanan, 2023-03-13 more...

23 - P1000740
Michel Caillaud
R095 Probleemblad 07-08/2000

(16+12) C+
BP in 16,0

1. b4 Sh6 2. b5 Sf5 3. b6 h6 4. bxa7 Th7 5. axb8=L Ta6 6. d4 Te6 7. d5 b6 8. d6 Lb7 9. dxe7 Lf3 10. exf8=L Lh5 11. L8a3 c5 12. L1f4 Ke7 13. Lbd6+ Kf6 14. Lf8 Da8 15. Lb8 Kg5 16. Lc1 Kg4
play all

Zyklischer Platzwechsel der 3 wLL.

paul: The problem obtained 3rd Prize in tourney. Reprints: H34, FIDE Album 1998-2000, H2 p.266, The Problemist Nov. 2007, p.187, feenschach 170 Nov. 2007. (2021-10-05)
more ...
comment

Keywords: Unique Proof Game, Interchange (LLL), Non-standard material (LL)
Genre: Retro
Computer test: Resolution time : 1.98 s., Natch 2.3 Copyright (C) 1997,98,99,2001,2002,2003,2004 Pascal Wassong
FEN: qB3B2/3p1ppr/1p2r2p/2p2n1b/6k1/8/P1P1PPPP/RNBQKBNR
Input: Gerd Wilts, 2000-10-02
Last update: A.Buchanan, 2021-10-05 more...

24 - P1001097
Michel Caillaud
R121 Probleemblad 01/2001
Special Prize 2001

(12+13) C+
h#2

1. cxb6 d6 2. bxc5 Txb8#
1. La7 Lxa7 2. 0-0-0? Tb8#
play all

Castling is impossible because, if black can still castle, the diagram position is draw due to the 50-move rule!
White captures: axb, bxc, exf. Black captures: hxg, gxf, exd, dxc. Promotions: a1=T, b1=T, h8=X. The position can only be unblocked by unpromoting White piece on h8. This can only be wRb5. wK must go to c6 to unpin wR. The journey is via g3, h2, e1, b2, & a3.The 50 white moves are: 34 by wK (screens on c8 [with careful step on a2 to let bB pass] then g8), 11 by wB6 (to e3 to exchange place with bB then screen on a7), 3 by wR (promotion on h8), 2 by wBa4.

more ...
comment

Keywords: Non-standard material (tt), 50 move rule, Cant Castler
Genre: Retro, h#
Computer test: Popeye WINDOWS-32Bit-Version 3.65 (2048 KB) Popeye 4.61 (also)
FEN: rb2k3/2p2p1K/1B6/1RPP1PP1/B1Prbrp1/1Prp1p2/2p2P2/N7
Reprints: Probleemblad , p. 220-227, 12/2010
Input: Gerd Wilts, 2001-02-11
Last update: A.Buchanan, 2020-10-10 more...

25 - P1004002
Noam D. Elkies
R0094 StrateGems 17 01-03/2002
Richard Stanley gewidmet

(14+15) C+
BP in 23.5

1. Sc3 d5 2. Sxd5 h6 3. Se3 Dd3 4. Tb1 Dh7 5. Sf5 a5 6. e3 a4 7. Dh5 a3 8. Ke2 axb2 9. a4 Ta6 10. a5 Tg6 11. a6 c5 12. a7 c4 13. a8=T c3 14. Ta6 cxd2 15. Tb6 d1=T 16. Ld2 Sf6 17. La5 Td8 18. c3 Sbd7 19. Kd3 Dg8 20. Kd4 Th7 21. Lb5 Dh8 22. La4 Sg8 23. Kd5 f6 24. Ke6= patt
play all

James Malcom: Is this the record for the longest PG ending in stalemate? (2020-11-13)
A.Buchanan: There are no shorter ones in PDB without a promotion ("=" can mean promotion or draw). Coming at 41.5 by Guus Rol there is P1011937, ending in draw by 3Rep. (2020-11-13)
more ...
comment

Keywords: Unique Proof Game, Non-standard material (Tt)
Genre: Retro
Computer test: Natch 3.1 (15 min.)
FEN: 2brkbnq/1p1np1pr/1R2Kprp/B4N1Q/B7/2P1P3/1p3PPP/1R4NR
Input: Gerd Wilts, 2002-04-05
Last update: James Malcom, 2021-11-09 more...

26 - P1008814
Unto Heinonen
10727 Die Schwalbe 182 04/2000

(14+10)
s#31
Madrasi

1. LIc4+ LId4+ 2. LIc6+ LIb6+ 3. Sc4+ LId4+ 4. Sa3+ LIb6+ 5. Gc4+ LId4+ 6. Gc2+ LIb6 7. Lc4+ LId4+ 8. Ld5+ LIb6+ 9. Lc4+ LId4+ 10. LIa2+ LIb6+ 11. Lc4+ LId4+ 12. Le2+ 13. Gc4+ LId4+ 14. Gf1+ 15. LIc4+ LId4+ 16. LIc2+ 17. Lc4+ LId4+ 18. Ld5+ 19. Gc4+ 20. Ga2+ 21. Sc4+ 22. Sd2+ 23. Lc4+ 24. Ld3+ 25. Gac4+ 26. Ge2+ 27. Sc4+ 28. Sa3+ 29. Lc4+ LId4+ 30. Ld5+ LIb6+ 31. LIc4+ LId4#
play all

Man beachte: alle 62 Züge sind Schachgebote ohne Schlagfall! Ein interessanter Mechanismus, bei dem die Räder wunderbar ineinandergreifen. Er schnurrt reibungslos wie eine Präzisionsuhr, nur leider nicht monoton im Uhrzeigersinn, so d aß es doch etwas braucht, bis man die Abläufe begriffen hat (WW).

Anton Baumann: Informalturnier 2000: 1. Preis (PR: Jörg Kuhlmann) (2023-09-26)
comment

Keywords: Madrasi, Consecutive checks (62), Non-standard material
Pieces:

= Grasshopper (G),

= Lion (LI)
Genre: Fairies
FEN: *3Q5*2Q1/p4*3Q2/*3q6*2Q/P1*2Q1*2Q2p/K*3q2r1*2Q1/1pk1*2q3/*2Qp*3QNB3/1*2Q1*2q4
Input: Gerd Wilts, 2003-07-01
Last update: James Malcom, 2021-07-30 more...

27 - P1011929
Nicolas Dupont
Retros mailing list 31/12/2003
Lob
Gianni Donati 50th Jubilee Tourney

(10+15)
BP in 29,5

1. Sf3 e5 2. Sd4 exd4 3. Sc3 dxc3 4. h4 cxb2 5. Th3 bxa1=L 6. Tg3 Lb2 7. Tg6 hxg6 8. a4 Th5 9. a5 Txa5 10. h5 Ta1 11. h6 a5 12. hxg7 Sh6 13. g8=L a4 14. Lh7 a3 15. Lg8 a2 16. Lh7 L8a3 17. Lg8 Ke7 18. Lh7 Kd6 19. Lg8 Kc5 20. Lh7 Kb4 21. Lg8 c5 22. Lh7 Da5 23. Lg8 b6 24. Lh7 Lb7 25. Lg8 Lf3 26. Lh7 Sc6 27. Lg8 Te8 28. Lh7 Te4 29. Lg8 Se5 30. Lh7
play all

A six-fold oscillation by the theme Bishop, made necessary because no one else can move. Compare with Satoshi Hashimoto, Problem Paradise 1999. (PR Gianni Donati)

Silvio Baier: Kann noch nicht komplett getestet werden, aber die Version 12. h7 a4 13. hxg8=L a3 14. Lh7 a2 15. Lg8 La3 16. Lh7 Ke7 17. Lg8 Kd6 18. Lh7 Kc5 19. Lg8 Kb4 20. Lh7 c5 21. Lg8 Qa5 22. Lh7 b6 23. Lg8 Lb7 24. Lh7 Lf3 25. Lg8 Sc6 26. Lh7 Re8 27. Lg8 Te4 28. Lh7 Se5 29. Lg8 ist C+ (Stelvio 1.5) (2023-08-18)
comment

Keywords: Unique Proof Game, Pendulum (L x12), Round Trip, Non-standard material
Genre: Retro
FEN: 8/3p1p1B/1p4pn/q1p1n3/1k2r3/b4b2/pbPPPPP1/r1BQKB2
Input: Gerd Wilts, 2004-01-01
Last update: James Malcom, 2023-05-04 more...

28 - P1012989
Hugo August
Sahovski vjesnik 1950
1. Preis

(14+12)
BP in 21,0

1. h3 h6 2. Th2 a6 3. a4 Ta7 4. a5 h5 5. Ta4 Th6 6. Tf4 Tb6 7. axb6 Sc6 8. bxa7 Sb8 9. axb8=L Sf6 10. La7 Sd5 11. Le3 Sc3 12. dxc3 a5 13. Dd3 a4 14. Led2 a3 15. e3 a2 16. Le2 a1=L 17. Lg4 hxg4 18. Ke2 g3 19. Kf3 gxh2 20. Ke4 h1=L 21. Ke5 f6+
play all

No. 928 HN
Mario Richter: My assumption: a record construction for the ratio g/f with f=number of uniquely determined last moves, g=length of the shortest proof game (s. Fairy Chess Review No.9 28.Nov.1949, p.69 for an explanation), here we have 42/19 (2012-07-16)
Moldenhauer: Computerprüfung: C+ Stelvio 1.11 1 Sekunde.
BP 21.0 cooked da NUPG C+.
Keine Lösung: BP 20.0, BP 20.5, BP 21.5, BP 22.0 cooked.
Beispiel BP 21.0: 1. a4 Sa6 2. a5 Sb8 3.Ta4 Sf6 4. Tf4 Sd5 5. h3 Sb6
6. Th2 a6 7. axb6 Ta7 8. bxa7 h5 9. axb8=L Th6 10. La7 Tc6 11. Le3 Tc3
12. dxc3 a5 13. Dd3 a4 14. Led2 a3 15. e3 a2 16. Le2 a1=L 17. Lg4 hxg4
18. Ke2 g3 19. Kf3 gxh2 20. Ke4 h1=L 21. Ke5 f6+ (2023-03-24)
A.Buchanan: I think it's perhaps a little disrespectful to describe the problem is "cooked" when there is no intention for the PG to be solution to be unique. It's certainly good to know that there is no shorter solution. (2023-03-25)
comment

Keywords: Non-Unique Proof Game, Non-standard material
Genre: Retro
FEN: 2bqkb2/1pppp1p1/5p2/4K3/5R2/2PQP2P/1PPB1PP1/bNB3Nb
Input: Henri Nouguier, 2004-01-11
Last update: A.Buchanan, 2023-03-25 more...

29 - P1013075
Richard J. Dunn
R344v The Problemist 01/2004

(15+15) C+
BP in 16,5

1. d4 Sc6 2. d5 Sd4 3. Lf4 Sxe2 4. Lg3 Sc1 5. La6 c6 6. c4 Da5+ 7. Sc3 Kd8 8. f4 Kc7 9. f5+ Kb6 10. f6 Kc5 11. fxg7 Sf6 12. g8=T Se4 13. Tg4 Sd2 14. Se4+ Kd4 15. Sc5+ Ke3 16. Td4 Sf1+ 17. Td2
play all

First version had Sf1 on b1.
Moldenhauer: Computerprüfung: C+ Euclide 1.11 eindeutige Lösung
gekocht bei BP 17.0 und bei BP 16.0 Umwandlungsfehler (2022-08-21)
comment

Keywords: Unique Proof Game, Non-standard material (T)
Genre: Retro
Computer test: Stelvio 1.2, 2sec
FEN: r1b2b1r/pp1ppp1p/B1p5/q1NP4/2P5/4k1B1/PP1R2PP/R1nQKnNR
Input: Gerd Wilts, 2004-02-04
Last update: Reto, 2023-05-19 more...

30 - P1013924
Hans Gruber
184 32'er 07-08/1990

(2+3) C+
h#2
b)Db1->c2

a) 1. Dg1 Kf4 2. Dbe1 Df3#
b) 1. Df1 Kf4 2. Dce2 Dg3#
play all

more ...
comment

Keywords: Aristocrat, Minimal, Miniature, Non-standard material, Bahnung (dd 16 9 a)
Genre: h#
Computer test: Popeye 4.87
FEN: 8/8/8/5K2/8/3Q4/5k2/1qq5
Input: Hans Gruber, 2004-05-01
Last update: Rainer Staudte, 2022-04-15 more...

31 - P1014060
Nils Adrian Bakke
Hans Gruber
Rainer Staudte
8600v feenschach 146 03-05/2002

(10+7)
s#9

1. Df2+? Tf3!
1. Df3+! Txf3 2. Def7+ Txf7 3. Deg7+ Txg7 4. Ddg8+ Txg8 5. Df2+ Lxf2 6. De8+ Kxe8 7. Dd8+ Kxd8 8. Dc8+ Kxc8 9. Dc7+ Kxc7#
play all

Rainer Staudte: In feenschach sollte nach 2012 eine Korrektur dieser Aufgabe erschienen sein. Wer kann diese finden? (2022-08-10)
Henrik Juel: Popeye 4.61 with 'opt non 0 1 thr 0' found no flaws (2023-06-12)
Vaclav Kotesovec: Gustav 4.2e (Lösezeit: 25 : 12 : 21 : 12,11 d, Hashtables: 350000 MB). Brute force, but with an error message "NICHT ALLE WEISSEN ZUEGE WURDEN GEPRUEFT" (Gustav has only room for 126 white moves), so not 100% C+, but C+ with high probability. (2024-03-23)
more ...
comment

Keywords: Opferminimal, Non-standard material (DDDDDDDD)
Genre: s#
Computer test: a) die letzten 7 Züge sind C+ (Volltest) b) mit der Popeye-Option "nichttr 0 1" C+ c) mit der Gustav-Option "42 U-" C+
FEN: K4k2/Q6Q/Q3Q1p1/p2QQ1Q1/Qpp1Q3/6r1/8/4b3
Input: Hans Gruber, 2004-05-01
Last update: Vaclav Kotesovec, 2024-03-23 more...

32 - P1015183
Valery Surkov
3722 Problemist Pribuzhya 25/12/1993
1. ehrende Erwähnung
Spezielle ehrende Erwähnung

(4+3)
s#3

1. Dd2 droht 2. Dc1+ Lxc1 3. Db2+ Lxb2#
1. ... Lxd2 2. Dc5+ Lb4 3. Dc3+ Lxc3#
1. ... Lf8 2. Dbb4+ Lxb4 3. Dc3+ Lxc3#
1. ... Lg7+ 2. Dc3+ Lxc3+ 3. Db2+ Lxb2#
play all

1211
SCHRECKE: C+, popeye 4.87 (2023-09-25)
comment

Keywords: Miniature, Non-standard material
Genre: s#
FEN: 8/3Q4/7b/1Q6/8/k7/p7/K2B4
Input: Selbstmatt-Miniaturen/Reflexmatt-Miniaturen, 2004-05-01
Last update: Rainer Staudte, 2023-10-28 more...

33 - P1066789
Göran Wicklund
R259 Probleemblad 5 09-10/2004
5. Preis

(16+11) C+
BP in 29,5

1. h4 Sc6 2. h5 Sd4 3. h6 Sb5 4. hxg7 h5 5. Th3 h4 6. Tg3 h3 7. a4 h2 8. a5 h1=D 9. a6 Dh2 10. axb7 a5 11. bxa8=T Lb7 12. Ta4 Lc6 13. Th4 a4 14. d4 a3 15. d5 a2 16. d6 a1=S 17. dxc7 Sb3 18. Ta1 Sa3 19. c8=T La4 20. Ta8 Db8 21. f4 Kd8 22. f5 Kc7 23. f6 Kb6 24. fxe7 Sf6 25. e8=T Ld6 26. Tc8 Te8 27. g8=T Te7 28. Tge8 Lc7 29. Tgg8 Dd6 30. Th1
play all

Zyklischer Platzwechsel sechs weißer Türme.

more ...
comment

Keywords: Unique Proof Game, Non-standard material, Interchange (TTTTTT), Impostor (TT)
Genre: Retro
Computer test: Moldenhauer: Computerprüfung: C+ Stelvio 1.11 00:05:59 Minuten. (hh:mm:ss) keine Lösung: BP 28.5, BP 29.0.
FEN: RqR1R1R1/2bprp2/1k1q1n2/8/b7/nn6/1PP1P1P1/RNBQKBNR
Reprints: (18) StrateGems 10-12/2007
(80) Die Schwalbe 250A 08/2011
Input: Gerd Wilts, 2004-10-17
Last update: Silvio Baier, 2023-08-15 more...

34 - P1067894
Gerald Irsigler
12643 Die Schwalbe 212 04/2005

(12+12) C+
26 konsekutive Schachgebote mit Umwandlungsfiguren

1. Dgh5+ Deh4+ 2. Dhxh4+ Ddxh4+ 3. Dcxh4+ Dhxh4+ 4. Dbxh4+ Dhxh4+ 5. Daxh4+ Dhxh4+ 6. Dg3+ Ddxg3+ 7. Dxg3+ Dhxg3+ 8. Dxg3+ Dxg3+ 9. Kf1+ Dgf2+ 10. Dexf2+ Ddxf2+ 11. Dfxf2+ Dxf2+ 12. Txf2+ Txf2+ 13. Txf2+ Txf2+
play all

James Malcom: I've looked at the source on page 42: https://www.dieschwalbe.de/hefte/schwalbe_212_April_2005.pdf
And the solution on page 53: https://www.dieschwalbe.de/hefte/schwalbe_215_Oktober_2005.pdf

The diagram and solution match exactly. Where is the mistake, or perhaps there was a misprint of some kind? (2021-02-06)
Mario Richter: White's first move is 1. Dh5+!, not 1. Dh4+! (2021-02-06)
comment

Keywords: Consecutive checks (26), Construction task, Non-standard material, Aristocrat, Superseded by (P1386254)
Genre: Fairies
Computer test: rawbats
FEN: 5R1q/5R1q/5Q1q/6Q1/QQQqq3/qQQqQ3/rrqqQK1k/8
Input: Gerd Wilts, 2005-05-21
Last update: Mario Richter, 2021-02-06 more...

35 - P1080420
Thierry Le Gleuher
R284 Probleemblad 07-08/2005

(14+13) C+
BP in 20,5

1. Sc3 f5 2. Sd5 Sf6 3. Sxe7 Sd5 4. Sg6 De7 5. a3 Dxa3 6. e4 d6 7. Se2 Kd7 8. Sc3 Kc6 9. Sb1 Sd7 10. Lb5+ Kxb5 11. e5 Ka4 12. e6 b5 13. e7 S7b6 14. exf8=S Ld7 15. Sxh7 Taf8 16. Sg5 Th4 17. Sh3 Tb4 18. Dg4 Le8 19. Dd4 f4 20. Sg1 Tf5 21. Sf8
play all

Henrik Juel: Cyclical shift by three white knights.
Sf8 is [Sb1], Sb1 is [Sg1], Sg1 is a promotee from f8 (2014-08-20)
Moldenhauer: Computerprüfung: C+ Stelvio 1.0 2 Sekunden.
Keine Lösung: BP 19.5, BP 20.0. (2023-03-02)
more ...
comment

Keywords: Unique Proof Game, Non-standard material
Genre: Retro
Computer test: Stelvio 1.0
FEN: 4bN2/p1p3p1/1n1p4/1p1n1r2/kr1Q1p2/q7/1PPP1PPP/RNB1K1NR
Reprints: (13) StrateGems 10-12/2007
Input: Gerd Wilts, 2009-01-06
Last update: Silvio Baier, 2023-03-03 more...

36 - P1094551
Frantisek Josef Prokop
v Nas rozhlas 19/04/1940
Spezialpreis

(14+5)
s#5

1. Sh1 gxh1=L 2. Sc8+ Kd5 3. Se7+ Kd6 4. Sf5+ Kd5 5. Lf3+ Lxf3#
1. Sh1 gxh1=T 2. Sc4+ Kd5 3. Lf3+ Kd4 4. Dg1+ Txg1 5. Dg7+ Sxg7#
1. Sh1 g1=L 2. Sc4+ Kd5 3. a8=D+ Kd4 4. De3+ Lxe3 5. Dg7+ Sxg7#
1. Sh1 g1=S 2. Dc3 Se2 3. Sc8+ Kd5 4. Dc5+ Ke4 5. Sg3+ Sxg3#
2. ... Sf3 3. Sc8+ Kd5 4. Dc4+ Ke5 5. Dg7+ Sxg7#
play all

Kaputte Urfassung siehe P1081412.

Anton Baumann: kürzer nach 1. - g1=S 2.Dc3 Sf3,Sxh3 3.Db4+ Ke5 4.Dg7+ Sxg7#
U-DL nach 1. - g1=L 2.Sc4+ Kd5 3.a8=D,L .. (2023-12-29)
comment

Keywords: Non-standard material (D), under-promotion (sllt)
Genre: s#
FEN: 3B4/P1RP1Q1p/1N1kn2R/6pK/6B1/7P/1PP2Np1/4Q3
Reprints: 11a Zauber des Schachdiagramms 1968
Input: Frank Müller, 2009-11-20
Last update: A.Buchanan, 2023-12-29 more...

37 - P1097628
Eduard Schildberg
S52 Deutsche Schachzeitung 07/1923
Pauly-Selbstmatt-Turnier
5. ehrende Erwähnung

(7+6)
s#8

1. Lc3 droht 2. Da7+ Lxa7 3. Tb2+ Ka1 4. Txg2+ Kxb1 5. Tb2+ Ka1 6. Tb5+ Ka2 7. Sc1+ Ka3 8. Ta5+ Txa5#
1. Lc3 droht 2. Tb2+ Ka1 3. Txg2+ Kxb1 4. Tb2+ Ka1 5. Tb5+ Ka2 6. Sc1+ Ka3 7. Da7+ Lxa7 8. Ta5+ Txa5#
1. Lc3 Lf2,Le3,Ld4 2. Da7+ Lxa7 3. Tb2+ Ka1 4. Txg2+ Kxb1 5. Tb2+ Ka1 6. Tb5+ Ka2 7. Sc1+ Ka3 8. Ta5+ Txa5#
1. ... Lc5 2. Tb2+ Ka1 3. Txg2+ Kxb1 4. Tb2+ Ka1 5. Tb5+ Ka2 6. Sc1+ Ka3 7. Da7+ Lxa7 8. Ta5+ Txa5#
play all

Anton Baumann: ausser bei 1. - Le3 differenzieren die angegebenen Gegenzüge die beiden Drohungen. Zu ergänzen ist die Fortsetzung nach 1. - La7, denn nur wegen dieser Parade ist der sLh3 erforderlich!
1. ... La7! 2.Tb2+ Ka1 3.Txg2+ Kxb1 4.Tb2+ Ka1 5.Df1+ Lxf1 6.Tb5+ Ka2 7.Sc1+ Ka3 8.Ta5+ Txa5# (2023-11-28)
more ...
comment

Keywords: Non-standard material
Genre: s#
FEN: K7/5Q2/8/1R1rB3/6P1/3N3b/k5p1/1N4bb
Input: Frank Müller, 2010-01-04
Last update: Olaf Jenkner, 2020-03-09 more...

38 - P1102766
Gunter Jordan
228 Opfer-Opfer-Matt 10/2005

(10+9) C+
h#18
0.1...

1. ... Kh2 2. Lf1 b3 3. Lg2 b4 4. Lxh1 Kxh1 5. Ka7 Lh2 6. Kb8 Kg1 7. Kc8 Kf1 8. Kd8 Ke1 9. Ke8 Kd1 10. Kf8 Kc1 11. Kg7 Kb2 12. Kf6 Kc3 13. Ke5 Kxd3 14. Kxd5 Ke3 15. Kxc6 Kf4 16. d5 Kxg4 17. Kd6 Kf5 18. c6 g4#
play all

Anton Baumann: C+ Gustav 4.1d (2021-03-29)
Henrik Juel: Position is legal, but Lg1 is a promoted pawn (2021-03-29)
comment

Keywords: Obvious promotion, Non-standard material (L)
Genre: h#
FEN: 8/2p1p3/1kPpP3/1p1P4/6p1/3p1pP1/1P1PbPK1/6BN
Input: Frank Müller, 2010-04-06
Last update: James Malcom, 2021-03-29 more...

39 - P1134538
Werner Speckmann
2695 Schach 17, p. 268, 09/1957
1. Preis
Wettkampf Westfalen-Berlin

(4+3)
#5

1. Sg6! Lb4 2. Sge5 Lf8 3. Sd7 Lfc5 4. Sdb6+ Lxb6 5. Sd6#
2. ... La7 3. Sf7 Lac5 4. Sfd6+ Lxd6 5. Sb6#
play all

G4
Henrik Juel: C+ Popeye 4.61 (except for late double threats) (2020-12-21)
comment

Keywords: Non-standard material (l)
Genre: n#
FEN: 2k2b2/2P5/2K5/8/2Nb3N/8/8/8
Input: Felber, Volker, 2010-09-11
Last update: Rainer Staudte, 2023-11-18 more...

40 - P1178762
Colin V. Vaughan
9 feenschach 32 01-03/1976

(15+2)
14 freiwillige Doppelschach-Matts mit Umwandlungsfiguren

more ...
comment

Keywords: Einzügerrekord (B1d4/D), Non-standard material (TTLSSSSS)
Genre: Mathematics
FEN: K2R2B1/3N4/2p1N3/RN1k1NR1/2N1N3/3N4/B2R2Q1/8
Input: HBae, 2010-10-26
Last update: A.Buchanan, 2020-12-13 more...

41 - P1180287
Karl Hermann Schwarz
R427 feenschach 21 04/1974

(14+13)
42 konsekutive Schachgebote mit Umwandlungsfiguren

1. Sed3+ Kf1+ 2. Lg2+ Sxg2+ 3. Tf4+ Sxf4+ 4. Lg2+ Sxg2+ 5. Tf4+ Sxf4+ 6. Lg2+ Sxg2+ 7. Tf4+ Sxf4+ 8. Lg2+ Sxg2+ 9. Tf4+ Sxf4+ 10. Lg2+ Sxg2+ 11. Sf4+ Te2+ 12. Scxe2+ Dc1+ 13. Sxc1+ Te2+ 14. Scxe2+ Dc1+ 15. Sxc1+ Sc4+ 16. Dxc4+ Td3+ 17. Scxd3+ Lc1+ 18. Txc1+ Lxc1+ 19. Dxc1+ Dd1+ 20. Dxd1+ Se1+ 21. De2+ Txe2+
play all

Dr. Zagler schreibt hierzu in fs-21: "Nur einem extremen Zufall ist es zuzuschreiben, daß diese Rekordstellung von Dr. Schwarz nicht verschollen blieb. Erhalten habe ich sie von dem Münchener Schachfreund und Partiespieler S. Rathgeber, dem sie vor über 20 Jahren gezeigt wurde, als er noch ein Schüler war und in Stuttgart lebte. Er hat sie sich damals notiert und seither aufbewahrt. Durch ein beiläufiges Gespräch ist diese Angelegenheit nun doch noch ans Tageslicht gekommen."

Autor: Dr. Schwarz
HBae: Autor unklar, welcher Schwarz ? (2010-11-15)
Henrik Juel: 'Dr. Schwarz' may well be a pseudonym.
The position is legal, but just barely so. (2010-11-15)
Olli Heimo: The current record is 51, look at http://www.xs4all.nl/~timkr/chess2/diary.htm
item 378.

378. 25 March 2008: New record by Alexey Khanyan - 51 consecutive checks (2010-11-16)
HBae: Thank You Olli (2010-11-17)
Mario Richter: The author might have been Dr. Karl Hermann Schwarz.

The position has some interesting features:
- With Black to move, there are 43 consecutive checks: 1. ... Rh3-d3+ 2.Nc1xd3+ Kf2-f1+ 3.Be4-g2+ Nf4xg2+ 4.Rd4-f4+ Ng2xf4+ 5.Bd5-g2+ Nf4xg2+ 6.Rc4-f4+ Ng2xf4+ 7.Bc6-g2+ Nf4xg2+ 8.Rb4-f4+ Ng2xf4+ 9.Bb7-g2+ Nf4xg2+ 10.Ra4-f4+ Ng2xf4+ 11.Ba8-g2+ Rh2xg2+ 12.Ne1xg2+ Qc7-c1+ 13.Nd3xc1+ Re7-e2+ 14.Nc1xe2+ Qc8-c1+ 15.Ne2xc1+ Re8-e2+ 16.Nc1xe2+ Bb2-c1+ 17.Ne2xc1+ Nd6-c4+ 18.Qa6xc4+ Qh5-e2+ 19.Nc1xe2+ Ba3-c1+ 20.Ne2xc1+ Nf4-d3+ 21.Qc4-f4+ Bh6xf4+ 22.Ng2-e3+ Bf4xe3+
- slightly modified (if the bQ is put on g1 instead of h5), then with WTM 44 consecutive checks are possible. (2010-11-17)
James Malcom: The current record is 54, achieved in 2013: P1386254 (2021-02-06)
comment

Keywords: Consecutive checks (42), Construction task, Non-standard material, Aristocrat, Superseded by (P1386254)
Genre: Fairies
FEN: B1q1r3/1Bq1r3/Q1Bn3b/3B3q/RRRRBn2/b6r/1b1K1k1r/R1N1N3
Input: HBae, 2010-11-15
Last update: James Malcom, 2021-02-06 more...

42 - P1181666
Noam D. Elkies
Tim Krabbé's Website (267) 16/11/2004

(13+13)
#10

1. Ddxe5+ Ddxe5+ 2. Dcxe5+ Dcxe5+ 3. Dbxe5+ Dbxe5+ 4. Daxe5+ Dfxe5+ 5. Dfxe5+ Dgxe5+ 6. Dgxe5+ Dhxe5+ 7. Dhxe5+ Tcxe5+ 8. Txe5+ Txe5+ 9. Txe5+ Dxe5+ 10. Dxe5#
mit Zugumstellungen
play all

https://timkr.home.xs4all.nl/chess2/diary_14.htm

Automatische Zugfolge (No-brainer)
PS 23 November: Some readers wondered (I did, too) whether the position of the 10-move no-brainer is legal. It is, says Elkies: "One pawn capture on a side yields three promotable pawns (a6xb7 and c3xd2, with White promoting bbc and Black add); and two piece captures on a side give four more promoting pawns (e6xf7, g6xh7, promote ffhh; f3xe2, h3xg2, promote eegg)."

Henrik Juel: The position is indeed legal, but Noam's explanation of seven white and seven black promotions might be clarified
By 'pawn capture' he means PxP, and by 'piece capture' he means that an officer is captured by a pawn
e6xLf7 and g6xLh7 are not both possible here, as the two missing black officers have different square colors, but the latter capture could be g5xLh6 after Black has played Ph7-h5 (2018-11-02)
James Malcom: See the 3 ply longer P1181668. (2021-02-06)
more ...
comment

Keywords: Aristocrat, No-brainer, Consecutive checks (19), Construction task, Non-standard material
Genre: n#
FEN: 1q2B2q/2q1B1q1/3qkq2/qrr1rRRQ/3QKQ2/2Q3Q1/1Q2n2Q/Q3n3
Input: HBae, 2010-12-04
Last update: James Malcom, 2021-02-07 more...

43 - P1181668
Aleksey Khanyan
Tim Krabbé's Website #267 24/01/2008

(13+13)
#12

1. ... Sdf4+ 2. Texf4+ Se2xf4+ 3. Tdxf4 Se6xf4+ 4. Tbxf4+ Sg2xf4+ 5. Taxf4+ Sg6xf4+ 6. Tf3xf4+ Sh3xf4+ 7. Tgxf4+ Sh5xf4+ 8. Thxf4+ Kxf4+ 9. Dhe5+ Tgxe5+ 10. D1xe5+ Texe5+ 11. D8xe5+ Dcxe5+ 12. Daxe5#
play all

https://timkr.home.xs4all.nl/chess2/diary_14.htm

Automatische Zugfolge (No-brainer) mit Zugumstellungen

Henrik Juel: sKf5 is in check from wTf3, so it is Black to move
With 11 white moves to reach mate, the stipulation should read #11, and the conventional numbering is 0... Sf4+ .. 11.Dxe5# (2020-04-19)
Henrik Juel: The missing men are wLLS and sPPP
8+5 promotions have happened, after the needed 3+2 pawn captures, e.g.
wPaxPb, wPcxPd, wPexPf, sPgxL, sPhxL
(The position would still be legal with one white light officer added to the diagram) (2020-04-19)
Henrik Juel: It may be that the 'conventional' numbering would ruin the PDB animation... (2020-04-19)
James Malcom: See the earlier 19 ply P1181666. (2021-02-06)
VL: My version of this problem, stipulated ###1, with wRf3 shifted to e3 was published in my article “Completely unavoidable mate” (The Problemist, v.24, No.6, November 2013; Pr.No.7), where ### denotes a CU-mate introduced in the article. (2021-02-09)
more ...
comment

Keywords: Non-standard material, No-brainer, Consecutive checks (22), Aristocrat, Construction task, Construction record, Move Length Record
Genre: n#
FEN: 4Q2Q/4r3/4n1n1/1bbK1krn/RR1RR1RR/2qn1R1n/4n1nN/Q3Q3
Input: HBae, 2010-12-04
Last update: James Malcom, 2021-02-07 more...

44 - P1183971
Dmitri Baibikow
680 Shakhmatnaya Kompozitsiya 98, p. 62, 12/2010
1. Preis

(13+12)
Were any diagrams repeated during the game?

R: 1. ... Df8xDg8# 2. Db8-a8 Lb7-c8 (*) 3. Dd8-b8 La8-b7 4. Dc8-d8 Lb7-a8 5. Db8-c8 (*) Lc8-b7 6. Db2-b8 Lb7-c8 7. De2-b2 Lc8-b7 8. Df3-e2 Lb7-c8 9. De2xBf3 Lc8-b7 10. Db2-e2 Lb7-c8 11. Db6-b2 Lc8-b7 12. Db8-b6 Lb7-c8 (*) 13. Dd8-b8 La8-b7 14. Dc8-d8 Lb7-a8 15. Db8-c8 (*) Lc8-b7 16. b7-b8=D f4-f3 17. b6-b7 Lb7-c8 18. a5xSb6 Sc4-b6 19. a4-a5 Se3-c4 20. a3-a4 Sf5-e3 21. a2-a3 Sh6-f5 22. Dh7-g8 Sg8-h6+ 23. Dh6-h7 Lc8-b7 24. Dh7-h6 Th6-g6 25. De4-h7 Tg6-h6+ 26. De2-e4 Lb7-c8 27. Db2-e2 La8-b7 28. Db8-b2 Lb7-a8 (*) 29. Dd8-b8 La8-b7 30. Dc8-d8 Lb7-a8 31. Db8-c8 (*) Lc8-b7 32. b7-b8=D f5-f4 33. b6-b7 b7xDc6 34. Da4-c6+ Kc6-d6 35. Sb5-a7++
play all

Pairs of repeated diagrams marked (*)

Nikolai Beluhov: Throughout the game, three different positions had to be repeated two times each (with the other side on the move) in order for the position to be formed.
The theme of loss-of-tempo-motivated position repetition was deeply explored by Luigi Ceriani (1894-1969) and is present in many of his works, including numerous ortho-reconstructions.
I only know of two twofold implementations: P1183992 by Ceriani himself (possibly a version by N. Plaksin or A. Kuznetsov of P0002948) and P0005418 by S. Volobuev (with a "#1" stipulation which determines the side to move in the diagram position). D. Baibikov's problem presents the first ever threefold implementation. (2011-01-02)
A.Buchanan: “fake game array” (FPI) is another special case of Ceriani’s player inversion (2021-02-24)
A.Buchanan: This is a wonderful problem. The repeated diagrams are where wDb8 & sLb7. There are sequences e.g. n. Db8~ Lb7-c8 (*) n+1. Dd8-b8 La8-b7 n+2. Dc8-d8 Lb7-a8 n+3. Db8-c8 (*) La8-b7. Need to ensure that over this sL shifts from c8 to a8, otherwise there are unnecessary additional repeated diagrams. Have fixed the solution given above. (2021-02-24)
A.Buchanan: “Position” is diagram + the move + castling rights + e.p. status. What is repeated is a diagram. Given that the stipulation was in Russian originally, I dare to change the stipulation here... (2021-02-25)
more ...
comment

Keywords: Tempo Loss, Last Moves?, Type C, Non-standard material (l)
Genre: Retro
FEN: Q1b1B1qK/N1pPRRr1/p1pkPBr1/3p2Pb/3P2p1/3p2P1/5P2/8
Input: Nikolai Beluhov, 2011-01-02
Last update: A.Buchanan, 2021-02-25 more...

45 - P1186631
Yuri Lebedev
Andrey Frolkin
574 Shakhmatnaya Kompozitsiya 84, p. 62, 10/2008

(16+9)
Retract wPf4 to its starting square in 11 retromoves

R: 1. Lh5xTg4+ Sg7-f5 2. g3xBf4 f5-f4 3. Sc1xLe2 Td4-g4 4. Sg4xSf2+ Se4-f2+ 5. f2xDe3+ Kf4-f3 6. g2-g3+
play all

Hans-Jürgen Manthey: R: 1. Lh5xTg4+ Sg7-f5 2. g3xf4 f5-f4 3. Sc1xLe2 Td4-g4 4. Sg4xf2+ Se4-f2+ 5. f2xDe3+ Kf4-f3 6. g2-g3+ Lf3-e2+ 7. Sh2-c1 Te2-d2 8. Lb2-c3 Lc3-e1 9. Sf6-g4 Te1-e2 10. Le2-d1 Sd2-e4 11. La3-b2 c5-c4 12. e5xd6 c7-c5 13. Lb2-a3 Tb1-e1 14. La3-b2 Tb8-b1 15. Ta1-f1 Sb1-d2 16. Sh7-f6 b2-b1=S 17. Dd1-g1 b3-b2 18. Lf1-e2 f7-f5 19. Lg4-h5 Tb4-d4 20. Ld7-g4 Th8-b8 21. Lc6-d7 Da7-e3 22. La8-c6 Db8-a7 23. a7-a8=L Dd8-b8 24. a6-a7 Tb8-b4 25. a5-a6 b4-b3 26. e4-e5 b5-b4 27. a4-a5 b7-b5 28. Ta5-g5 Se6-g7 29. Ta8-a5 Sd4-e6 30. a7-a8=T Sc6-d4 31. e2-e4 h5-h4 32. Kh4-h3 Lg4-f3 33. Sg5-h7 Lc8-g4 34. Sf3-g5 Kf5-f4 35. Lc1-a3 Lg7-c3 36. Sg1-f3 Ke6-f5 37. Kg5-h4 Kd7-e6 38. Kf4-g5 Ke8-d7 39. Ke3-f4 Sg8-h6 40. Kd2-e3 h7-h5 41. Ke1-d2 Lf8-g7 42. d2-d3 g7-g6 43. Sc3-a2 d7-d6 44. a2-a4 Ta8-b8 45. a6-a7 Sb8-c6 46. a5-a6 Ta6-a8 47. b4xa5 Ta8-a6 48. b2-b4 a7-a5 49. Sb1-c3 (2021-07-19)
more ...
comment

Keywords: Non-standard material (TL), Constrained problem
Genre: Retro
FEN: 8/4p3/3P2pn/5nR1/2p2PBp/2BPPk1K/2PrNN1P/3BbRQR
Input: Nikolai Beluhov, 2011-02-05
Last update: A.Buchanan, 2021-07-20 more...

46 - P1240697
Dmitri Baibikow
C22 Length Records in Last Single Moves? 11/2009

(12+10) cooked
Last 46 single moves?

R: 1. Tc3xDc2 h5xSg4 2. Se5-g4 h6-h5 3. Sf3-e5 h7-h6 4. Se1-f3 Dd1-c2 5. Sc2-e1 Df1-d1 6. g5-g6 f2-f1=D 7. g4-g5 f3-f2 8. g3-g4 g4xSf3 9. Se5-f3 g5-g4 10. Sd7-e5 g6-g5 11. Sc5-d7 g7-g6 12. Sa4-c5 Sd1-b2 13. Sb2-a4 Sf2-d1 14. f5-f6 Sh3-f2 15. f4-f5 Sg1-h3 16. f3-f4 g2-g1=S 17. f2-f3 f3xDg2 18. Dh3-g2 f4-f3 19. Dc8-h3 f5-f4 20. Da8-c8 f6-f5 21. a7-a8=D f7-f6 22. a6-a7 a7xDb6 23. Kc5-b5 La5-b4
play all

Cook: alternative Auflösung (mri, PDB 03.07.2023)
R: 1. Tc3xDc2 g5-g4 2. f5-f6 f6xSg5 3. Sf3-g5 f7-f6 4. Se1-f3 Dd1-c2 5. Sc2-e1 Dg1-d1 6. g5-g6 g2-g1=D 7. g4-g5 h3xDg2 8. Dg3-g2 h4-h3 9. Db8-g3 h5-h4 10. Da8-b8 h6-h5 11. a7-a8=D h7-h6 12. a6-a7 a7xSb6 13. Kc5-b5 La5-b4 14. Kd5-c5 Da4-b3 15. Ke5-d5 Sd6-c4 16. Kf4-e5 Se8-d6 17. Kg3-f4 Lb5-d3 18. Le7-a3 Sd3-b2 19. Ta3-c3 Kb2-c1 20. Td1-d2 Sc1-d3 21. Th1-d1 Sd2-b1 22. Kg2-g3 Sf1-d2 23. Se1-c2 Sf6-e8 24. g3-g4 f2-f1=S 25. Sf3-e1 c2-c1=S 26. d2xTe3 Tc3-e3 27. Sg1-f3 Tc8-c3 28. Kf1-g2 Ld7-b5 29. Le6-a2 Th8-c8 30. Ta1-a3 Sg8-f6 31. f4-f5 f3-f2 32. c3xBd4 Kb3-b2 33. Lh3-e6 g4xDf3 34. La3-e7 g5-g4 35. Lc1-a3 g7-g5 36. b2xTc3 Tc8-c3 37. Df2-f3 Ta8-c8 38. De1-f2 Lc8-d7 39. d3xBe4 c3-c2 40. f3-f4 Kb4-b3 41. c2xSd3 Dd7-a4 42. Dd1-e1 Kc5-b4 43. Sc4-b6 Kd6-c5 44. Sa3-c4 Ke7-d6 45. Sb1-a3 Ke8-e7 46. Ke1-f1 Sc5-d3 47. Lf1-h3 Lb4-a5 48. a5-a6 Sa6-c5 49. a4-a5 Sb8-a6 50. g2-g3 Dd8-d7 51. f2-f3 c4-c3 52. Sf3-g1 Lf8-b4 53. Sg1-f3 e5-e4 54. Sf3-g1 d5-d4 55. Sg1-f3 c5-c4 56. Sf3-g1 e7-e5 57. Sg1-f3 d7-d5 58. a3-a4 c7-c5 59. a2-a3

Gerald Ettl: Die Stellung ist falsch. wTc2 auf c3 und +sDc2 (2023-07-02)
Gerald Ettl: Bzw. vielleicht ist die Stellung richtig, aber dann stimmt die Lösungsangabe und Forderung nicht. (2023-07-02)
Mario Richter: Hallo Gerald, Type C heißt: ein K muß im Schach stehen, also ist das Diagramm wohl richtig. Die Originalforderung war "Last 46 single moves?" (nicht ... 45 ...) - da hat wohl jemand den einleitenden schachbietenden Zug vergessen. (2023-07-03)
more ...
comment

Keywords: Last Moves? (45), Non-standard material (s), Type C, Superseded by (P1353149)
Genre: Retro
FEN: 8/1p6/1p3PP1/1K6/1bnPP1p1/Bq1bP3/BnRRP2P/1nk5
Input: Gerd Wilts, 2012-06-04
Last update: A.Buchanan, 2023-07-05 more...

47 - P1243621
Alessandro Cuppini
1053 Umenie 64 09/2002

(11+4) C+
s#7

1. g8=L Kxf5 2. Lh5 Kxe4 3. Lg4 Kxd3 4. Lf3 Kxc2 5. Le2 Kxb1 6. Ld3 Kxa2 7. Ldh7 b1=S,L,T,D#
play all

Non-standard rather than obtrusive force. Obtrusive implies accidental (e.g. wLa8 bBb7). Here those wS are thematic
SCHRECKE: C+, Gustav 4.1d, Brute Force (2020-12-19)
comment

Keywords: Non-standard material (SSSSS)
Genre: s#
FEN: 3N3K/6P1/6k1/5N2/4N3/pP1N4/NpN5/bN1B4
Input: Frank Müller, 2012-06-30
Last update: Marcin Banaszek, 2020-12-21 more...

48 - P1246053
Nicolas Dupont
FIDE Olympic Tourney 40 Istanbul 2012
ehrende Erwähnung

(13+11) C+
BP in 30,5

1. h4 a5 2. h5 a4 3. h6 a3 4. hxg7 h5 5. c4 Th6 6. c5 Tb6 7. c6 h4 8. cxb7 c5 9. e4 Sc6 10. b8=S c4 11. Sxd7 c3 12. Se5 Lf5 13. Sf3 Lg6 14. e5 f5 15. e6 Sf6 16. g8=S c2 17. Sxe7 cxb1=L 18. Sd5 Le4 19. Sc3 Dd3 20. Sb1 0-0-0 21. e7 h3 22. e8=S h2 23. Sc7 hxg1=L 24. Sb5 Lh2 25. Sg1 Dc2 26. f3 Td3 27. Kf2 Tb3 28. axb3 a2 29. S5a3 axb1=S 30. Ta2 Sc3 31. Sb1
play all

Henrik Juel: Natch 3.1 did nothing in half an hour
Stopped while searching for pos. 1 (2018-12-30)
Moldenhauer: Computerprüfung: Keine Lösung BP 29.5, BP 30.0 mit Stelvio 1.11. (2023-04-24)
comment

Keywords: Unique Proof Game, Pronkin Theme (SSS), Non-standard material
Genre: Retro
Computer test: Stelvio 1.17, 5:05min
FEN: 2k2b2/8/1rn2nb1/5p2/4b3/1Pn2P2/RPqP1KPb/1NBQ1BNR
Input: Gerd Wilts, 2012-08-03
Last update: Reto, 2023-04-18 more...

49 - P1247054
Manfred Mündel
2056 Freie Presse (Chemnitz) 02/02/1979

(8+4) C+
#2

1. Sf5+! Kc4 2. Se5#
1. ... Kd3 2. Sd6#
1. ... Kxd5 2. Dc6#
1. ... Ke4 2. Sfe7#
play all

more ...
comment

Keywords: Plus flights, Non-standard material (S), Checking key
Genre: 2#
Computer test: SCHRECKE: popeye 4.87
FEN: 3R4/1K1N4/6Q1/1p1N3n/3k4/4N3/3r1B2/3B4
Input: Felber, Volker, 2012-08-16
Last update: Dieter Berlin, 2023-04-28 more...

50 - P1248304
Filip S. Bondarenko
feenschach 1960

(3+8) C+
Gewinn
#21

1. Dd8+ Td6 2. Db7+ Tcc6 3. Da5+ T4c5 4. Db3+ Tdc4 5. Dd2+ Ted4 6. Df3+ Tee4 7. Dg5+ e5 8. Df7+ Te6 9. Dd8+ Tcd6 10. Db7+ Tcc6 11. Da5+ T4c5 12. Db3+ Tdc4 13. Dd2+ Ted4 14. Df3+ e4 15. Dg5+ Te5 16. Df7+ Tde6 17. Dd8+ Tcd6 18. Db7+ Tcc6 19. Da5+ T4c5 20. Db3+ Tdc4 21. Dd2#
play all

Henrik Juel: Several round-trips by the white queens secure the mate (2022-01-15)
Mu-Tsun Tsai: See also P1360655 (2023-06-15)
more ...
comment

Keywords: Consecutive checks (21), Non-standard material
Genre: n#, Studies
Computer test: C+ Gustav 4.2a
FEN: 8/7Q/2r1p3/2rkr3/2rrr2Q/7K/8/8
Reprints: 806 Magyar Sakkelet 04/1969
Input: Nikolai Beluhov, 2012-09-13
Last update: James Malcom, 2023-06-15 more...

51 - P1268624
Rolf Uppström
7546 Springaren 09/1993
nach Karl Fabel (1952)

(2+16) C+
#11

1. Kf8 g6 2. Ke7 Dh3 3. Kd6 Dh4 4. Ke6 Dh3 5. Ke7 Dh4 6. Kf8 Dh3 7. Kg7 Dh4 8. Kxg6 Dh3 9. Kxg5 Dh4+ 10. Kxh4 Sh6 (bel) 11. Se5#
10. ... Sc1 (bel) Sd4#
play all

A.Buchanan: The only nearby white square which can’t be checked profitably is e6 but 3. Ke6? Sg~+! discovered check. So the triangle can only be navigated in one direction (2021-05-09)
more ...
comment

Keywords: Minimal, Non-standard material (l)
Genre: n#
Computer test: C+ Gustav 4.1d
FEN: 8/4K1p1/2N5/6pp/4ppnq/4pkp1/4nrrb/5bb1
Input: Frank Müller, 2013-04-26
Last update: A.Buchanan, 2021-05-09 more...

52 - P1299317
Ottó Titusz Bláthy
149e Fata Morgana 1922

(4+15)
s#150*

James Malcom: How would one even begin to approach solving this, along with its compatriot P1299316? (2020-11-20)
comment

Keywords: Sea Snake, Non-standard material (l)
Genre: s#
FEN: 4k3/7K/7p/1p4p1/5ppr/6pb/n2B1prb/3N1Bbn
Input: Frank Müller, 2015-03-15
Last update: A.Buchanan, 2020-11-21 more...

53 - P1312965
Andrey Frolkin
Kislyak Theme: New Developments , p. 6, 2/12/2015

(11+12)
Release the position

Henrik Juel: Solution by author
Retract: -1…Qb7-c8+ -2.a7-a8=B Bc4-a6 -3.a6-a7 Qb1-b7 -4.a5-a6 b2-b1=Q 5.a4-a5 b3-b2 -6.a3-a4 a4xSb3! These 11 single moves were unique ones. -7.Sd4-b3 Bc3-a1 -8.Sb5-d4 Rd1-d3 -9.Sd6-b5 Ra1-d1 -10.Se8-d6 a2-a1=R -11.Sg7-e8 B~ -12.Se8xRg7 Rh7-g7 -13.Qh8-g8 B -14.Kg8-f8 B~ -15.Sd6-e8 B~ … -20.b7-b8=S … -24.b2-b4 b3xRa2! (b3xQa2?) -25.Ra1-a2 … -30.Rf8-a8(b8) Re8-e7 -31.a2-a3! Ra8-e8
The “mobile part” of the upper cage has been released, but the “immovable part” – on the squares e5, e6, f5,
f6, f7, g4, g5, g6, h5 – is yet to be released.
-32.Re8-f8 Ra5-a8 -33.e7-e8=R! ~ -34.d6xSe7 (d6xQe7 is also possible) Sc6-e7+ -35.~ e7-e6. (2015-12-04)
James Malcom: Shortest proof game: 1. Nc3 a5 2. Nd5 a4 3. Nf6+ gxf6 4. e4 Bh6 5. Be2 b5 6. h4 Nc6 7. h5 Ne5 8. d4 Ng6 9. hxg6 Bf4 10. Bh5 Be5 11. Bg5 h6 12. Nf3 hxg5 13. Kd2 Ba6 14. Re1 Bh2 15. e5 Kf8 16. e6 Kg7 17. Re5 g4 18. Rg5 f5 19. Ne5 f6 20. Qf3 Ra7 21. Qa8 fxe5 22. d5 b4 23. Re1 b3 24. Re4 Kh6 25. Rb4 Rh7 26. Rb8 Qf8 27. Kc3 Qg7 28. Rf8 Bc4 29. Rf6 Qf7 30. exf7 e6 31. d6 Ne7 32. Kb4 Bd5 33. Kb5 Rb7+ 34. Ka6 Rb4 35. Qh8 Rc4 36. dxe7 Rc6+ 37. Kb7 Rb6+ 38. Kc8 Bc4 39. Kd8 Bf4 40. Ke8 Bd2 41. Kf8 Bc3 42. Kg8 Rb8+ 43. e8=R Rd8 44. Rf8 Re8 45. a3 Re7 46. Rb8 Bb4 47. Rb5 Ba5 48. Rd5 Bc3 49. Rd1 Bd5 50. Ra1 Bc4 51. Ra2 bxa2 52. b4 Bd4 53. b5 a1=R 54. b6 Rd1 55. b7 Rd3 56. b8=N Ba1 57. Nc6 Ba6 58. Na7 Bb5 59. Nc8 Ba6 60. Nd6 Bb5 61. Ne8 Ba6 62. Kf8 Bc4 63. Qg8 Rg7 64. Nxg7 Bb5 65. Ne8 Bc4 66. Nd6 Bb5 67. Ne4 Ba6 68. Nd2 Bc4 69. Nb3 axb3 70. a4 b2 71. a5 b1=Q 72. a6 Qb7 73. a7 Ba6 74. a8=B Qc8+ (2023-02-11)
Bob Baker: Proof game in 71.0 posted in a chess.com forum by EvinSung (screen name): 1. d4 h6 2. Bg5 hxg5 3. h4 f6 4. e4 Kf7 5. e5 Kg6 6. e6 b5 7. h5+ Kh6 8. Qf3 Nc6 9. Kd2 Ne5 10. Kc3 Rb8 11. Qa8 Bb7 12. Kb4 Bf3 13. Nc3 Bg4 14. Re1 Ng6 15. hxg6+ Bh3 16. Be2 Rb6 17. Bh5 Qe8 18. Nf3 Qf7 19. exf7 Bf5 20. Re6 Bd3 21. Rhe1 Rd6 22. R1e5 g4 23. Rg5 f5 24. Nd5 Be2 25. Nf6 gxf6 26. Ne5 fxe5 27. Rf6 e6 28. Ka5 Rd5 29. Ka6 Rd6+ 30. Kb7 Rc6 31. d5 Bc5 32. d6 Ne7 33. dxe7 Rh7 34. Qh8 Bc4 35. Kc8 Rd6 36. Kd8 Rc6 37. Ke8 Rd6 38. Kf8 Rb6 39. Kg8 Rb8+ 40. e8=R a5 41. Rf8 Re8 42. a3 Re7 43. Rb8 a4 44. Rb6 b4 45. Rd6 b3 46. Rd1 Bd4 47. Ra1 Bc3 48. Ra2 bxa2 49. b4 Bb2 50. b5 a1=R 51. b6 Rb1 52. b7 Rc1 53. b8=N Bc3 54. Nc6 Ba1 55. Nd4 Rd1 56. Nb5 Rd2 57. Nd6 Rd3 58. Ne8 Rd4 59. Kf8 Rd5 60. Qg8 Rg7 61. Nxg7 Rd6 62. Ne8 Rd5 63. Nd6 Rd4 64. Nb5 Rd2 65. Nd4 Rd3 66. Nb3 axb3 67. a4 b2 68. a5 b1=Q 69. a6 Qb7 70. a7 Ba6 71. a8=B Qc8+ (2024-02-02)
comment

Keywords: Kislyak Theme, Non-standard material
Genre: Retro
FEN: B1q2KQ1/2pprP2/b3pRPk/4ppRB/6p1/3r4/2P2PP1/b7
Input: A.Buchanan, 2015-12-04
Last update: A.Buchanan, 2015-12-04 more...

54 - P1340218
Nicolas Dupont
R433 The Problemist 509, p. 23, 3/2011
1st Prize
The Problemist 2011-2012

(12+14) C+
PG in 32.5

1. e4 h5 2. Dg4 hxg4 3. b4 Th3 4. b5 Td3 5. b6 g3 6. bxa7 b5 7. h4 b4 8. h5 b3 9. h6 b2 10. h7 bxa1=L 11. Th6 Lc3 12. Tc6 dxc6 13. e5 Sd7 14. e6 Sb6 15. exf7+ Kd7 16. h8=T e5 17. Th1 Lc5 18. f8=D e4 19. Df3 e3 20. Dd1 e2 21. f4 exd1=L 22. f5 Lh5 23. f6 Ke6 24. f7 Dd6 25. f8=D Ld7 26. Df3 Tf8 27. Dd1 Tff3 28. a8=T Sf6 29. Tb8 Sa8 30. Sa3 La7 31. Tb1 c5 32. Ta1 La4 33. Sb1
play all

Duplicate Diagram: P1214056

Judge's comment [Kostas Prentos]: "This is not the first quadruple Pronkin in a proof game; Nicolas has published a few, already. It is the first time that one of the four thematic pieces, the wQ, is captured at home, and is replaced by a new Pronkin Queen. The promoted black Bishops are an effective, but unpleasant alternative to the standard method of doubled pawns that usually come with this theme. In this case, the capture on d1 is thematic, and that on a1, forgivable, considering that it takes 5 moves to reestablish the Rook on a1. On the plus side, all the surviving white army has resumed the initial position."
Henrik Juel: diagram error: black king is missing (2018-12-30)
Moldenhauer: Nach obiger Notation die
FEN: n7/b1p3p1/3qkn2/2p4b/b7/2br1rp1/P1PP2P1/RNBQKBNR
Diagramm müsste noch geändert werden! (2023-06-18)
James Malcom: Fixed. (2023-06-19)
Moldenhauer: Computerprüfung: C+ neue Stellung Stelvio 1.31
ursprüngliche FEN: n7/b1p3p1/2bqkn2/2p4b/b7/3r1rp1/P1PP2P1/RNBQKBNR keine Lösung!
neue FEN mit UPG Lösung 2 Min.: n7/b1p3p1/3qkn2/2p4b/b7/2br1rp1/P1PP2P1/RNBQKBNR
Jetzt muss jemand prüfen ob die ursprünglichen FEN falsch waren! Eingabefehler?
Diese Möglichkeit habe ich nicht. James kannst Du bitte? Danke!!!
Dann wäre noch das Diagramm auf die neuen FEN zu ändern.
Beim Start steht der Läufer noch auf c6. (2023-06-20)
James Malcom: Dug through the online The Problemist archive: https://www.theproblemist.org/mags.pl?type=tp
Issue 3/2011, p. 23.
The diagram now matches the publication and solution. (2023-06-20)
Henrik Juel: C+ Stelvio 1.13 (2023-06-20)
Henrik Juel: ... and no solution in 32.0 moves (2023-06-20)
Henrik Juel: should be Stelvio 1.31 of course, sorry (2023-06-20)
comment

Keywords: Unique Proof Game, Non-standard material (ll), Homebase (w), Pronkin Theme (DDTT), Ceriani-Frolkin Theme (D), Future Proof Game
Genre: Retro
Computer test: Stelvio 1.13
FEN: n7/b1p3p1/3qkn2/2p4b/b7/2br1rp1/P1PP2P1/RNBQKBNR
Input: A.Buchanan, 2017-09-27
Last update: Silvio Baier, 2023-08-15 more...

55 - P1347216
Philippe Rouzaud
RIFACE 2017
1. Lob

(12+16) C+
KBP in 15,0
Weißer Längstzüger
Weißer Ohneschlag

paul: 1.Sa3 d5 2.Sc4 d×c4 3.Sf3 Qd3 4.Sd4 Kd8 5.Sb3 c×b3
6.h4 b×c2 7.Rh3 c×d1=B 8.Re3 Ba4 9.Re6 Be8 10.Ra6 Qd7
11.Rh6 g6 12.a4 Bg7 13.Ra3 Be5 14.Rh3 Bg3 15.Rh1 Bh2 (2021-08-19)
comment

Keywords: Unique Proof Game, No-capture chess (w), Maximummer (w), Non-standard material (l), RIFACE Retro Composition Tourney (2017)
Genre: Retro, Fairies
FEN: rnbkb1nr/pppqpp1p/6pR/8/P6P/8/1P1PPPPb/2B1KB1R
Reprints: Phénix 279-280, p. 10967, 11-12/2017
Input: A.Buchanan, 2018-02-24
Last update: A.Buchanan, 2020-10-05 more...

56 - P1360129
Joaquim Crusats
8252 Phénix 287, p. 11266, 07-08/2018

(14+12)
Resolve the position

Joaquim Crusats: ?1.Sg6-h8 Bh7-g8 (1) ?2.Se7/h4-g6 Bg8-h7+ ?3.Sf5-e7/h4 Bh7-g8 (2) ?4.Sd6-f5 Bg8-h7+ ?5.Se4-d6 Bh7-g8 (3) ?6.Sc5-e4 Bg8-h7+ ?7.Sd3-c5 Bh7-g8 (4) ?8.Sb4-d3 Bg8-h7+ ?9.Sc2-b4 Bh7-g8 (5) ?10.Sa3-c2 Bg8-h7+ ?11.Sc2xPa3 Bh7-g8 (6) ?12.Sb4-c2 Bg8-h7+ ?13.Sd3-b4 Bh7-g8 (7) ?14.Sc5-d3 Bg8-h7+ ?15.Se4-c5 Bh7-g8 (8) ?16.Sd6-f5 Bg8-h7+ ?17.Sf5-d7 Bh7-g8 (9) ?18.Se7/h4-f5 Bg8-h7+ ?19.Sg6-e7/h4 Bh7-g8 (10) ?20.Sh8-g7 Bg8-h7+ ?21.h7?h8=S a4-a3 ?22.h6?h7 a5-a4 ?23.h5?h6 h6xSg5 ?24.Se4-g5 Bh7-g8 (11); then e.g.: ?25.Sd2-e4 Bg8-h7+ ?26.Sb3-d2 a7/a6-a5 ?27.Sc1-b3 Kd2-d1 (12) ?28.h4-h5 Ke3-d2 ?29.Kc2-b1 etc.

Full both ways stair walk of the wS (unavoidable).
12 screenings.

White balance: 14 + gxf + hxg = 16 bPb7?b1=R
Black balance: 12 + bxc + cxd + dxe + a-bP = 16 wPh2?h8 (2023-10-03)
comment

Keywords: Non-standard material (t)
Genre: Retro
FEN: 6bN/5p2/4P3/3Pp1p1/2Pp1PP1/2p2prB/P3PrRb/RK1krQB1
Input: A.Buchanan, 2019-01-25
Last update: A.Buchanan, 2019-01-25 more...

57 - P1360655
A. Bantegnie
8239 Phénix 287 2018

(8+13) C+
#27

1. Deb5+! Td5 2. Dc7+ Ted6 3. De8+ Tfe6 4. Dg7+ Tff6 5. Dh5+ T4f5 6. Dg3+ Tef4 7. Dhe2+ De4 8. Dxe4+ Tbxe4 9. Dc3+ Tdd4 10. Dbb5+ T6d5 11. Dc7+ Ted6 12. De8+ Tfe6 13. Dg7+ Tff6 14. Dh5+ T4f5 15. Dg3+ Tef4 16. Dhe2+ Tde4 17. Dxe4+ Taxe4 18. Dc3+ Tdd4 19. Db5+ T6d5 20. Dc7+ Ted6 21. De8+ Tfe6 22. Dg7+ Tff6 23. Dh5+ T4f5 24. Dg3+ Tef4 25. De2+ Tde4 26. Dxe4+ Kxe4 27. De3#
play all

Mu-Tsun Tsai: See also P1248304 (2023-06-15)
comment

Keywords: Non-standard material, Consecutive checks (27)
Genre: n#
Computer test: V. Kotesovec: Gustav 4.0 f, Lösezeit: 22 : 11 : 39 : 23,46 d
FEN: 1n6/K7/Qp1rrr2/4kr2/rr1qrr2/N1Q5/r1P1QP2/1Q6
Input: Vaclav Kotesovec, 2019-02-04
Last update: Mu-Tsun Tsai, 2023-06-15 more...

58 - P1361903
Olaf Jenkner
2019/18 Schach in Schleswig-Holstein 03/2019

(5+3) C+
s#9

1. Dhxh2+! Kf1 2. Dhg1+ Ke2 3. Dcc4+ Kf3 4. Dgd1+ Kg2 5. Dcd5+ Kh3 6. D4d3+ Kh4 7. De1+ Kh5 8. Ke4+ Kg4 9. Df4+ Dxf4#
1. ... Kf3 2. Dh5+ Kg2 3. Ddg6+ Kf1 4. Dh1+ Ke2 5. Dde4+ Kd2,Kf2 6. Deg2+ Kd3,Ke3 7. Dhh3+ Kd4 8. D2g4+ Kd5 9. De5+ Dxe5#
play all

Die beiden Varianten sollten auf jeden Fall nachgespielt werden.
„Vier weiße Damen, das ist starker Tobak, auch wie sie mit dem schwarzen König auf dem Parkett herumspringen. Die Echo-Epaulettenmatts mit Funktionswechsel der weißen Damen auf c7 und d6 als Block und Selbstmatterzwinger sind witzig. Schade, dass die weiße Dame auf h8 in den Mattbildern unbeteiligt herumsteht“ (Stephen Rothwell).
„ein Selbstmatt mit schweren Waffen“ (Claus Grupen).
Anton Baumann: C+ Gustav 4.2a (2021-11-25)
comment

Keywords: Non-standard material, Echomatt, Epaulettenmatt, Checking key
Genre: s#
FEN: 1q5Q/2Q5/3Q4/5K2/3Q4/8/6kp/8
Input: Olaf Jenkner, 2019-03-03
Last update: Marcin Banaszek, 2021-11-29 more...

59 - P1362217
Arno Tüngler
F590 Problem Paradise 62, p. 16, 04-07/2013

(9+15) C+
ser-A=>B in 387
Stellung B: wKa6 wLa8 wBf3d3c4f5g7c6a7
sKh8 sTb2e4d5 sLh1e6 sSc1f8 sBa3 (9+9)

1. Ka5-a6 2. b3xc4 3. Lb5-a4 4. La4-d1 5. Ld1-e2 6. Le2-f1 7. Lf1-h3 8. Lh3-g4 9. Lg4-h5 10. Lh5-e8 11. Le8-d7 12. Ld7-c8 13. Lc8xb7 14. Lb7-c8 15. Lc8-d7 16. Ld7-e8 17. Le8-h5 18. Lh5-g4 19. Lg4-h3 20. Lh3-f1 21. Lf1-e2 22. Le2-d1 23. Ld1-a4 24. La4-b5 25. Ka6-a5 26. Ka5-a4 27. Lb5-a6 28. La6-c8 29. Lc8-d7 30. Ld7-e8 31. Le8-h5 32. Lh5-g4 33. Lg4-h3 34. Lh3-f1 35. Lf1-e2 36. Le2-d1 37. Ld1-b3 38. Ka4-b4 39. Kb4-c3 40. Lb3-c2 41. Kc3-d2 42. Kd2-d1 43. Lc2-a4 44. La4-b5 45. Lb5-a6 46. La6-c8 47. Lc8-d7 48. Ld7-e8 49. Le8-h5 50. Lh5-g4 51. Lg4-h3 52. Lh3-f1 53. Lf1-e2 54. Kd1-e1 55. Ke1-f1 56. Le2-d1 57. Ld1-a4 58. La4-b5 59. Lb5-a6 60. La6-c8 61. Lc8-d7 62. Ld7-e8 63. Le8-h5 64. Lh5-g4 65. Lg4-h3 66. Lh3-g2 67. Kf1-g1 68. Kg1-h2 69. Kh2-h3 70. Lg2-f1 71. Lf1-e2 72. Le2-d1 73. Ld1-a4 74. La4-b5 75. Lb5-a6 76. La6-c8 77. Lc8-d7 78. Ld7-e8 79. Le8-h5 80. Lh5-g4 81. Kh3-h4 82. Kh4-h5 83. Lg4-h3 84. Lh3-f1 85. Lf1-e2 86. Le2-d1 87. Ld1-a4 88. La4-b5 89. Lb5-a6 90. La6-c8 91. Lc8-d7 92. Ld7-e8 93. Le8-g6 94. Kh5-g5 95. Kg5-f6 96. Lg6-f7 97. Kf6-e7 98. Ke7-e8 99. Lf7-h5 100. Lh5-g4 101. Lg4-h3 102. Lh3-f1 103. Lf1-e2 104. Le2-d1 105. Ld1-a4 106. La4-b5 107. Lb5-a6 108. La6-c8 109. Lc8-d7 110. Ke8xd8 111. Kd8-e8 112. Ld7-c8 113. Lc8-a6 114. La6-b5 115. Lb5-a4 116. La4-d1 117. Ld1-e2 118. Le2-f1 119. Lf1-h3 120. Lh3-g4 121. Lg4-h5 122. Lh5-f7 123. Ke8-e7 124. Ke7-f6 125. Lf7-g6 126. Kf6-g5 127. Kg5-h5 128. Lg6-e8 129. Le8-d7 130. Ld7-c8 131. Lc8-a6 132. La6-b5 133. Lb5-a4 134. La4-d1 135. Ld1-e2 136. Le2-f1 137. Lf1-h3 138. Lh3-g4 139. Kh5-h4 140. Kh4-h3 141. Lg4-h5 142. Lh5-e8 143. Le8-d7 144. Ld7-c8 145. Lc8-a6 146. La6-b5 147. Lb5-a4 148. La4-d1 149. Ld1-e2 150. Le2-f1 151. Lf1-g2 152. Kh3-h2 153. Kh2-g1 154. Kg1-f1 155. Lg2-h3 156. Lh3-g4 157. Lg4-h5 158. Lh5-e8 159. Le8-d7 160. Ld7-c8 161. Lc8-a6 162. La6-b5 163. Lb5-a4 164. La4-d1 165. Ld1-e2 166. Kf1-e1 167. Ke1-d1 168. Le2-f1 169. Lf1-h3 170. Lh3-g4 171. Lg4-h5 172. Lh5-e8 173. Le8-d7 174. Ld7-c8 175. Lc8-a6 176. La6-b5 177. Lb5-a4 178. La4-c2 179. Kd1-d2 180. Kd2-c3 181. Lc2-b3 182. Kc3-b4 183. Kb4-a4 184. Lb3-d1 185. Ld1-e2 186. Le2-f1 187. Lf1-h3 188. Lh3-g4 189. Lg4-h5 190. Lh5-e8 191. Le8-d7 192. Ld7-c8 193. Lc8-a6 194. La6-b5 195. Ka4-a5 196. Ka5-a6 197. Ka6-b7 198. Kb7xb8 199. Kb8-b7 200. Kb7-a6 201. Ka6-a5 202. Ka5-a4 203. Lb5-a6 204. La6-c8 205. Lc8-d7 206. Ld7-e8 207. Le8-h5 208. Lh5-g4 209. Lg4-h3 210. Lh3-f1 211. Lf1-e2 212. Le2-d1 213. Ld1-b3 214. Ka4-b4 215. Kb4-c3 216. Lb3-c2 217. Kc3-d2 218. Kd2-d1 219. Lc2-a4 220. La4-b5 221. Lb5-a6 222. La6-c8 223. Lc8-d7 224. Ld7-e8 225. Le8-h5 226. Lh5-g4 227. Lg4-h3 228. Lh3-f1 229. Lf1-e2 230. Kd1-e1 231. Ke1-f1 232. Le2-d1 233. Ld1-a4 234. La4-b5 235. Lb5-a6 236. La6-c8 237. Lc8-d7 238. Ld7-e8 239. Le8-h5 240. Lh5-g4 241. Lg4-h3 242. Lh3-g2 243. Kf1-g1 244. Kg1-h2 245. Kh2-h3 246. Lg2-f1 247. Lf1-e2 248. Le2-d1 249. Ld1-a4 250. La4-b5 251. Lb5-a6 252. La6-c8 253. Lc8-d7 254. Ld7-e8 255. Le8-h5 256. Lh5-g4 257. Kh3-h4 258. Kh4-h5 259. Lg4-h3 260. Lh3-f1 261. Lf1-e2 262. Le2-d1 263. Ld1-a4 264. La4-b5 265. Lb5-a6 266. La6-c8 267. Lc8-d7 268. Ld7-e8 269. Le8-g6 270. Kh5-g5 271. Kg5-f6 272. Lg6-f7 273. Kf6-e7 274. Ke7-e8 275. Lf7-h5 276. Lh5-g4 277. Lg4-h3 278. Lh3-f1 279. Lf1-e2 280. Le2-d1 281. Ld1-a4 282. La4-b5 283. Lb5-a6 284. La6-c8 285. Lc8-d7 286. Ke8-d8 287. Kd8xc7 288. Kc7-d8 289. Kd8-e8 290. Ld7-c8 291. Lc8-a6 292. La6-b5 293. Lb5-a4 294. La4-d1 295. Ld1-e2 296. Le2-f1 297. Lf1-h3 298. Lh3-g4 299. Lg4-h5 300. Lh5-f7 301. Ke8-e7 302. Ke7-f6 303. Lf7-g6 304. Kf6-g5 305. Kg5-h5 306. Lg6-e8 307. Le8-d7 308. Ld7-c8 309. Lc8-a6 310. La6-b5 311. Lb5-a4 312. La4-d1 313. Ld1-e2 314. Le2-f1 315. Lf1-h3 316. Lh3-g4 317. Kh5-h4 318. Kh4-h3 319. Lg4-h5 320. Lh5-e8 321. Le8-d7 322. Ld7-c8 323. Lc8-a6 324. La6-b5 325. Lb5-a4 326. La4-d1 327. Ld1-e2 328. Le2-f1 329. Lf1-g2 330. Kh3-h2 331. Kh2-g1 332. Kg1-f1 333. Lg2-h3 334. Lh3-g4 335. Lg4-h5 336. Lh5-e8 337. Le8-d7 338. Ld7-c8 339. Lc8-a6 340. La6-b5 341. Lb5-a4 342. La4-d1 343. Ld1-e2 344. Kf1-e1 345. Ke1-d1 346. Le2-f1 347. Lf1-h3 348. Lh3-g4 349. Lg4-h5 350. Lh5-e8 351. Le8-d7 352. Ld7-c8 353. Lc8-a6 354. La6-b5 355. Lb5-a4 356. La4-c2 357. Kd1-d2 358. Kd2-c3 359. Lc2-b3 360. Kc3-b4 361. Kb4-a4 362. Lb3-d1 363. Ld1-e2 364. Le2-f1 365. Lf1-h3 366. Lh3-g4 367. Lg4-h5 368. Lh5-e8 369. Le8-d7 370. Ld7-c8 371. Lc8-a6 372. La6-b5 373. Ka4-a5 374. Ka5-a6 375. Lb5-a4 376. La4-d1 377. Ld1-e2 378. Le2-f1 379. Lf1-h3 380. Lh3-g4 381. Lg4-h5 382. Lh5-e8 383. Le8-d7 384. Ld7-c8 385. Lc8-b7 386. Lb7-a8 387. h6xg7+
play all

B-Stellung: wKa6 wLa8 wBf3d3c4f5g7c6a7 sKh8 sTb2e4d5 sLh1e6 sSc1f8 sBa3 (9+9)
Moldenhauer: Computerprüfung: C+ Jacobi v0.7.6 beta1 in 36 Min. 55 Sek. PG demolition mode = Brute Force
heuristic mode 7 Sek. (2022-08-28)
comment

Keywords: Seriesmover, A to B, Move Length Record, Non-standard material
Genre: Fairies
FEN: 1b1n1n1k/Pnp3r1/2P1b2P/KB1r1P2/2q1r3/pP1P1P2/1r6/2n4b
Reprints: G41 FIDE Album 2013-2015 2019
Input: Arno Tüngler, 2019-03-08
Last update: Alfred Pfeiffer, 2019-10-09 more...

60 - P1362648
Jan Golha
Ivan Skoba
ChessProblems.ca 30.06.2012
7. Platz
Section 1
3. Thematurnier

(1+14)
pSer-A=>B in 89
Vogtländer Schach
Stellung B: wKh6 sKe6 sTd4d5e4e5 sLg6 sSa1a8 sBf4f7g3

1. Kg2-f1 ... 2. Kf1-e1 ... 3. Ke1-d1+ Ke3-d3 4. Kd1-c1 ... 5. Kc1-b2 ... 6. Kb2-a3 ... 7. Ka3-a4+ Kd3-c4 8. Ka4-a5+ Kc4-c5 9. Ka5-a6 ... 10. Ka6-b7 ... 11. Kb7-c8 ... 12. Kc8-d8+ Kc5-d6 13. Kd8-e8+ Kd6-e6 14. Ke8-f8 ... 15. Kf8-g7 ... 16. Kg7xh8+ Lg8-h7 17. Kh8-g7 ... 18. Kg7-f8 ... 19. Kf8-e8 ... 20. Ke8-d8+ Ke6-d6 21. Kd8-c8 ... 22. Kc8-b7 ... 23. Kb7-a6 ... 24. Ka6-a5+ Kd6-c5 25. Ka5-a4+ Kc5-c4 26. Ka4-a3 ... 27. Ka3-b2 ... 28. Kb2-c1 ... 29. Kc1-d1+ Kc4-d3 30. Kd1-e1+ Kd3-e3 31. Ke1-f1 ... 32. Kf1-g2 ... 33. Kg2xh3+ Th6-g6 34. Kh3-g2 ... 35. Kg2-f1 ... 36. Kf1-e1 ... 37. Ke1-d1+ Ke3-d3 38. Kd1-c1 ... 39. Kc1-b2 ... 40. Kb2-a3 ... 41. Ka3-a4+ Kd3-c4 42. Ka4-a5+ Kc4-c5 43. Ka5-a6 ... 44. Ka6-b7 ... 45. Kb7-c8 ... 46. Kc8-d8+ Kc5-d6 47. Kd8-e8+ Kd6-e6 48. Ke8-f8 ... 49. Kf8-g7+ Tg6-h6 50. Kg7xh6 ... 51. Kh6-g5+ f6-f5 52. Kg5-h6 ... 53. Kh6-g7 ... 54. Kg7-g8+ Lh7-g6 55. Kg8-f8 ... 56. Kf8-e8 ... 57. Ke8-d8+ Ke6-d6 58. Kd8-c8 ... 59. Kc8-b7 ... 60. Kb7-a6 ... 61. Ka6-a5+ Kd6-c5 62. Ka5-a4+ Kc5-c4 63. Ka4-a3 ... 64. Ka3-b2 ... 65. Kb2-c1 ... 66. Kc1-d1+ Kc4-d3 67. Kd1-e1+ Kd3-e3 68. Ke1-f1 ... 69. Kf1-g2 ... 70. Kg2-h3 ... 71. Kh3-g4+ f5-f4 72. Kg4-h3 ... 73. Kh3-g2 ... 74. Kg2-f1 ... 75. Kf1-e1 ... 76. Ke1-d1+ Ke3-d3 77. Kd1-c1 ... 78. Kc1-b2 ... 79. Kb2-a3 ... 80. Ka3-a4+ Kd3-c4 81. Ka4-a5+ Kc4-c5 82. Ka5-a6 ... 83. Ka6-b7 ... 84. Kb7-c8 ... 85. Kc8-d8+ Kc5-d6 86. Kd8-e8+ Kd6-e6 87. Ke8-f8 ... 88. Kf8-g7 ... 89. Kg7-h6 a=>b
play all

paul: Checked by Jacobi. (2021-12-08)
comment

Keywords: Parry Series, Vogtländer Chess, A to B, Non-standard material, Rex solus (w)
Genre: Fairies
FEN: n5br/5p2/5p1r/3rr3/3rr3/4k1pr/6K1/n7
Input: Arno Tüngler, 2019-03-23
Last update: Alfred Pfeiffer, 2019-03-23 more...

61 - P1371439
Thierry Le Gleuher
R546 The Problemist 27-6, p. 229, 11/2019

(13+12)
Last 102 single moves?
Duplex

BTM: R: 1. Lc2-b1 Kg1-f1 2. Lb1-c2 Tf1-f2 3. Lc2-b1 Tf2-f3 4. Lb1-c2 Tf3-g3 5. Lc2-b1 Tg3-h3 6. Th3-h2 Th2-h1 7. Lb1-c2 Kh1-g1 8. Lc2-b1 Tg1-f1 9. Lb1-c2 Tf1-f2 10. Lc2-b1 Tf2-f3 11. Lb1-c2 Tf3-g3 12. Tg3-h3 Th3-h2 13. Lc2-b1 Kh2-h1 14. Lb1-c2 Th1-g1 15. Lc2-b1 Kg1-h2 16. Lb1-c2 Th2-h1 17. Lc2-b1 Kh1-g1 18. Lb1-c2 Tg1-f1 19. Lc2-b1 Tf1-f2 20. Lb1-c2 Tf2-f3 21. Tf3-g3 Tg3-h3 22. Lc2-b1 Th3-h2 23. Lb1-c2 Kh2-h1 24. Lc2-b1 Th1-g1 25. Lb1-c2 Kg1-h2 26. Lc2-b1 Th2-h1 27. Lb1-c2 Kh1-g1 28. Lc2-b1 Tg1-f1 29. Lb1-c2 Tf1-f2 30. Tf2-f3 Tf3-g3 31. Lc2-b1 Tg3-h3 32. Lb1-c2 Th3-h2 33. Lc2-b1 Kh2-h1 34. Lb1-c2 Th1-g1 35. Lc2-b1 Tg1-f1 36. Tf1-f2 Lf2-e1 37. Te1-f1 Tf1-g1 38. Lb1-c2 Tg1-h1 39. Lc2-b1 Kh1-h2 40. Lb1-c2 Th2-h3 41. Lc2-b1 Th3-g3 42. Lb1-c2 Lg3-f2 43. Lc2-b1 Tf2-f1 44. Lb1-c2 Tf1-g1 45. Lc2-b1 Kg1-h1 46. Lb1-c2 Th1-h2 47. Lc2-b1 Kh2-g1 48. Lb1-c2 Tg1-h1 49. Lc2-b1 Kh1-h2 50. Lb1-c2 Th2-h3 51. h3-h4 Lh4-g3 52. Lc2-b1
52. ... Tg3-f3 53. Lb1-c2 Tf3-f2 54. Lc2-b1 Tf2-f1 55. Lb1-c2 Tf1-g1 56. Lc2-b1 Kg1-h1 57. Lb1-c2 Th1-h2 58. h2-h3 Th3-g3 59. Lc2-b1 Lg3-h4 60. Lb1-c2 Th8-h3
play all

Editor's comment: Do not be put off by the length of R546: there is a repeated sequence of moves.
James Malcom: Solution? Also, is this an Othoreconstrution? (2023-05-30)
Henrik Juel: Here is the solution from the May 2020 issue (from www.theproblemist.org , which is a treasure of info, althoug I find it hard to navigate)
R546 (Le Gleuher): Retroanalysis: The wPs captured the 4 missing black units.
Thus, wPb4 comes from b2, and (Pa2) promoted to the extra wR on a8 with (Pa7)
letting it pass by switching to the b file (first capture of the 3 missing white units).
(Pb7) must have promoted to a rook on a1 or c1 (second capture). (Ph7) must
have moved onto the g file (third and final capture) in order to be captured. Thus
(Pc7) and (Pe7) promoted to rooks on the c and e files, respectively. It is not
possible to immediately take back a4xb3 or c2xd3. The retro-move e4xf5 is
forbidden since then the bP which promoted on e1 cannot retract to e5. Black can
only move in the southeast cage, while White’s bishop is free to oscillate between
c2 and b1.
Black to move: back 1.Bc2-b1 Kg1-f1 2.Bb1-c2 Rf1-f2 3.Bc2-b1 Rf2-f3
4.Bb1-c2 Rf3-g3 5.Bc2-b1 Rg3-h3 6.Rh3-h2 Rh2-h1 7.Bb1-c2 Kh1-g1 8.Bc2-b1
Rg1-f1 9.Bb1-c2 Rf1-f2 10.Bc2-b1 Rf2-f3 11.Bb1-c2 Rf3-g3 12.Rg3-h3 Rh3-h2
13.Bc2-b1 Kh2-h1 14.Bb1-c2 Rh1-g1 15.Bc2-b1 Kg1-h2 16.Bb1-c2 Rh2-h1
17.Bc2-b1 Kh1-g1 18.Bb1-c2 Rg1-f1 19.Bc2-b1 Rf1-f2 20.Bb1-c2 Rf2-f3
21.Rf3-g3 Rg3-h3 22.Bc2-b1 Rh3-h2 23.Bb1-c2 Kh2-h1 24.Bc2-b1 Rh1-g1
25.Bb1-c2 Kg1-h2 26.Bc2-b1 Rh2-h1 27.Bb1-c2 Kh1-g1 28.Bc2-b1 Rg1-f1
29.Bb1-c2 Rf1-f2 30.Rf2-f3 Rf3-g3 31.Bc2-b1 Rg3-h3 32.Bb1-c2 Rh3-h2
33.Bc2-b1 Kh2-h1 34.Bb1-c2 Rh1-g1 35.Bc2-b1 Rg1-f1 36.Rf1-f2 Bf2-e1
37.Re1-f1 Rf1-g1 38.Bb1-c2 Rg1-h1 39.Bc2-b1 Kh1-h2 40.Bb1-c2 Rh2-h3
41.Bc2-b1 Rh3-g3 42.Bb1-c2 Bg3-f2 43.Bc2-b1 Rf2-f1 44.Bb1-c2 Rf1-g1
45.Bc2-b1 Kg1-h1 46.Bb1-c2 Rh1-h2 47.Bc2-b1 Kh2-g1 48.Bb1-c2 Rg1-h1
49.Bc2-b1 Kh1-h2 50.Bb1-c2 Rh2-h3 51.h3-h4 Bh4-g3 52.Bc2-b1
then 52…Rg3-f3 (or 52...Bg3-h4 53.Bb1-c2 Bh4-g3…) 53.Bb1-c2 Rf3-f2 54.Bc2-b1 Rf2-f1 55.Bb1-c2
Rf1-g1 56.Bc2-b1 Kg1-h1 57.Bb1-c2 Rh1-h2 58.h2-h3 Rh3-g3 59.Bc2-b1 Bg3-h4 60.Bb1-c2 Rh8-h3 etc…
The diagram position is a draw and the last 103 single moves are determined.
White to move: back 1…Kg1-f1 …
51.h3-h4 Bh4-g3 52.Bc2-b1 then the same… Here, there are 99 single moves between the diagram position and the retro-move h3-h4. Of course, trying to insert another manoeuvre in the solution would lead to an overshoot of the 101 single moves, which would be incompatible with the 50 moves rule. Here only 102 last single moves are determined.
So, we have a D25/102, a new record for last single moves for ‘D’ type (Duplex) with 25 pieces (It is also
the overall record for Duplex). With black to move, the same diagram is also a record with 25 pieces (B25/103) (2023-05-30)
comment

Keywords: Last Moves?, Non-standard material, 50 move rule
Genre: Retro
FEN: 8/6p1/8/5PP1/1P3pRP/1p1PPrrr/n2pRrPR/1BNKbk1r
Input: A.Buchanan, 2020-01-05
Last update: Mario Richter, 2023-05-30 more...

62 - P1378722
Daniele Gatti
1901 Gaudium 214 30/11/2019

(9+2) C+
s#12

1. Kf1! Dxf8 2. Th4+ Dh6 3. Tc8+ Kh7 4. Tfh5 Dxh5 5. Tg7+ Kh6 6. Tge7 Dxh4 7. Tg6+ Kh5 8. Tc5+ Dg5 9. Th3+ Kxg6 10. Tc6+ Kf5 11. Tf3+ Df4 12. Te1 Dxf3#
play all

Olaf Jenkner: vergleiche P1238256 (2022-03-09)
more ...
comment

Keywords: Aristocrat, Unpinning, Epaulettenmatt, Pinning, Minimal (d), Non-standard material, Model mate, Sacrifice of white pieces, Opferhäufung
Genre: s#
Computer test: A. Baumann: Gustav 4.2 a
FEN: 5Rqk/2R5/6R1/5R2/6R1/4R3/4K1R1/6R1
Input: Gunter Jordan, 2020-08-03
Last update: Olaf Jenkner, 2022-03-09 more...

63 - P1379376
James Malcom
(30) MatPlus.net Forum 26/8/2020

(13+13) C+
BP in 11.0
(-:

1. f4 b5 2. f5 b4 3. f6 b3 4. fxe7 bxc2 5. exf8=B cxb1=L 6. Da4 Ke7 7. Dh4+ Ke6 8. g4 Se7 9. Lg2 Txf8 10. Lb7 Sc6 11. Lxc8 Tb8
play all

Henrik Juel: What is the joke, James?
Natch 3.1 found no solution (2020-08-26)
James Malcom: The solution has now been added in, Henrik.

This PG has two purposes.
1) It is another exploration of what themes be realized with the dummy pawn involves.
2) It is also to push the boundaries of how long a dummy pawn PG can be made. (2020-08-27)
Henrik Juel: Thanks, James
Apparently you also extended the proof game; the one I tested was in 10.5
The solution shows the Schnoebelen theme, by the way (2020-08-27)
Henrik Juel: You forgot to remove wPf2 from the diagram position (2020-08-27)
James Malcom: Removed, and yes I did manage to find a way to extend it by a ply, in theme for its purpose. The version is also C+. (2020-08-27)
A.Buchanan: I think sLb1 is kind of anti-Belfort Any way to replace it with a Phoenix/Prenix knight? (2020-08-27)
Henrik Juel: Strictly speaking, this is not Belfort, which requires two units to stand away
As Andrew suggests, if sLb1 were a black knight, we would have Belfort (2020-08-27)
A.Buchanan: It's limiting to just talk about Belfort Theme - one historical tourney which had a fiddly constraint about the number of pieces exhibiting the property. Want really to talk more generally about Belfort *Effect*, which is a property of a single unit (2022-01-26)
comment

Keywords: Belfort (L), Dummy Pawn, Schnoebelen Theme, Golden Age (Dummy Pawn), Ceriani-Frolkin Theme (B), Prentos Theme (B), Unique Proof Game, Non-standard material (l)
Genre: Retro
Computer test: Jacobi v.0.7.5
FEN: 1rBq1r2/p1ppnppp/2n1k3/8/6PQ/8/PP1PP2P/RbB1K1NR
Input: James Malcom, 2020-08-26
Last update: A.Buchanan, 2023-08-04 more...

64 - P1380320
James Malcom
www.chess.com 9/7/2020

(9+9)
#5

1. Kd3! droht 2. Ke4 ... 3. Kf3 ... 4. Lxg2#,Lxg4#
1. ... Sh5 2. Txh5 b5 3. e8=T! b4 4. Te6 Sxe5+,S~ 5. Txe5#,Tx~#
1. ... Se6,Sf5 2. Lxe6,Lxf5 b5 3. e8=L! b4 4. Lh5 Lf6,L~ 5. Lhxg4#
1. ... b5 2. e8=L! Se6,Sf5 3. Lxe6,Lxf5 b4 4. Lh5 Lf6,L~ 5. Lhxg4#
play all

https://www.chess.com/forum/view/more-puzzles/a-challenging-mate-in-5-can-you-find-the-first-move?page=1

http://matplus.net/start.php?px=1601166179&app=forum&act=posts&fid=gen&tid=2507

Henrik Juel: Correct key, but damaged by multiple threats and duals, e.g.
1.Kd3 thr. 2.e8=DTLS,Ke4 (2020-09-27)
James Malcom: Typo fixed. And Henrik, the threats are not the point here. The point here is how the different play of the Black knight changes White's promotions. (2020-09-27)
A.Buchanan: It's a beautiful idea, still looking for its rendering though as the many duals and the obstreperous wL are quite distracting (2020-09-28)
James Malcom: There aren't any duals in full-length variations, though. The extra bishop is indeed annoying, but unfixable so far. (2020-09-28)
A.Buchanan: There are still some trivial duals in the mating move, but yes. This problem is trying to ignore threats: you can see that the computer solution. The solution is much more coherent with "nosh noth" switched on. So when are the cases, Henrik, when you switch those options on? It would be event better if one was able to switch threats on for the 4th move. This underscores that there should be a Popeye option for any white move "noth" is self-selecting, depending upon the number of variations. (2020-09-29)
Henrik Juel: Andrew, I use the Popeye option 'nosh' when the output without them is overwhelmingly large
The 'not' option is tricky, and usually expands the output; in some cases it shows apparent duals that are not real ones, when you apply the rule that dualistic play should be ignored, when it appears after black moves that do not prevent the threat
In the case of multiple threats things get messy, like in this problem, as I recall (2020-09-29)
more ...
comment

Keywords: under-promotion (T, L), Changed mates, Non-standard material (L)
Genre: n#
FEN: 2B4R/4P1n1/1p6/4P3/6nb/1P2p2k/2K1Pprp/5B1N
Reprints: MatPlus.net Forum 10/7/2020
Input: James Malcom, 2020-09-27
Last update: James Malcom, 2020-09-29 more...

65 - P1380878
Gilbert S. Dobbs
155 The Problem (Pittsburgh) 14 27/06/1914

(3+4) C+
#2

1. Df7! droht 2. De2#
1. ... f3,Lf3 2. De6#
1. ... d3,Ke5 2. Ddxf4#
1. ... Kf3 2. Dfxf4#
play all

Henrik Juel: Two white queens (2020-10-13)
more ...
comment

Keywords: Non-standard material, Flight giving and taking key
Genre: 2#
Computer test: Popeye 4.61
FEN: 8/K7/5Q2/8/3pkp2/8/3Q4/7b
Input: Rainer Staudte, 2020-10-13
Last update: Mario Richter, 2021-01-31 more...

66 - P1380879
Gilbert S. Dobbs
154 The Problem (Pittsburgh) 14 27/06/1914
dedicated to William E. Rudolph

(3+3)
#3

1. De1!

Henrik Juel: Ruined by duals after 1... Kd4,Kc2,f6 (2020-10-13)
comment

Keywords: Non-standard material
Genre: 3#
FEN: 4Q3/4Kp2/8/7n/7Q/3k4/8/8
Input: Rainer Staudte, 2020-10-13
Last update: Mario Richter, 2021-01-31 more...

67 - P1381190
Ulrich Auhagen
A Deutsche Schachzeitung 02/1986

(4+1) C+
#2

1. Dg8! Ke5 2. Dd4#
1. ... Ke7 2. Ddd8#
play all

more ...
comment

Keywords: Non-standard material, Rex solus (s), just one species
Genre: 2#
Computer test: Popeye 4.61
FEN: 8/8/5k2/8/8/4K3/Q7/1Q1Q4
Input: Rainer Staudte, 2020-10-21
Last update: Alfred Pfeiffer, 2020-10-21 more...

68 - P1381377
Gerhard Josten
Tim Krabbé's Website AD 131

(10+16) C+
#13

1. Kc4! cxd6 2. Sc3+ Sxc3 3. Dh1+ f3 4. Dxh4+ Tf4 5. Dhh7+ f5 6. Dxb7+ Dxb7 7. Dxb7+ d5+ 8. Dxd5+ Scxd5 9. Sxd5 Sxd5 10. Te3+ Sdxe3+ 11. Dxe3+ Sxe3+ 12. Txe3+ dxe3 13. d3#
play all

ONSTERFELIJKE WOESTHEID-https://timkr.home.xs4all.nl/admag/woest.htm

Anton Baumann: C+ Gustav 4.1d (2020-11-10)
comment

Keywords: Opferminimal, Non-standard material
Genre: n#
FEN: 1q4r1/1bp2pQ1/3Q4/1Kp1pr2/1n1pkp1p/RQ1RN3/nbnP4/QN6
Input: James Malcom, 2020-10-29
Last update: Olaf Jenkner, 2020-11-10 more...

69 - P1381630
Erik Richter
B Deutsche Schachzeitung , p. 422, 12/1975

(4+4) C+
#2

1. f8=S! Scd5,Sa8,Sc6,Sb5,Sa6,Se6,Se8 2. Se6#
1. ... Sc6 2. Sxc6#
1. ... Sed5,Sf5,Seg6,Sg8,Sc8 2. Sc6#
1. ... Sf7,Shg6 2. Sexf7#
play all

more ...
comment

Keywords: Non-standard material, under-promotion key (S)
Genre: 2#
Computer test: popeye 4.85
FEN: 3k3n/2n1nP2/3N4/4N3/8/8/8/K7
Input: Rainer Staudte, 2020-11-08
Last update: Alfred Pfeiffer, 2020-11-09 more...

70 - P1381764
Daniele Gatti
Best Problems 89, p. 194, 1/2019

(12+11)
#22
b) sLa3->b8: s#22

a) 1. Th8+! Kxh8 2. Txh3+ Kg8 3. Th8+ Kxh8 4. Txh2+ Kg8 5. Th8+ Kxh8 6. Th1+ Kg8 7. Th8+ Kxh8 8. Th1+ Kg8 9. Th8+ Kxh8 10. Th1+ Kg8 11. Th8+ Kxh8 12. Th1+ Kg8 13. Th8+ Kxh8 14. Th1+ Kg8 15. Th8+ Kxh8 16. Th1+ Kg8 17. Th8+ Kxh8 18. Dh1+ Kg8 19. Dh7+ Kf8 20. Dh8+ Ke7 21. Dxg7+ Kd6,Kd8 22. Dc7#

b) 1. Th8+! Kxh8 2. Txh3+ Kg8 3. Th8+ Kxh8 4. Txh2+ Kg8 5. Th8+ Kxh8 6. Th1+ Kg8 7. Th8+ Kxh8 8. Th1+ Kg8 9. Th8+ Kxh8 10. Th1+ Kg8 11. Th8+ Kxh8 12. Th1+ Kg8 13. Th8+ Kxh8 14. Th1+ Kg8 15. Th8+ Kxh8 16. Th1+ Kg8 17. Th8+ Kxh8 18. Dh1+ Kg8 19. Dh7+ Kf8 20. Dh8+ Ke7 21. Dxg7+ Kd6,Kd8 22. Dc7+ Lxc7#
play all

http://www.bestproblems.it/bppdf/BP2019(complete).pdf

"... details are everything ..."

Henrik Juel: Popeye 4.61 with 'opt thr 0' found no flaws in part a (2020-11-12)
Henrik Juel: ... and with 'opt thr 0 non 0 1' no flaws in part b (2020-11-12)
comment

Keywords: Task (Construction), Non-standard material, Räumung and Bahnung, Checking key
Genre: n#
FEN: q3r1k1/6p1/1K2p1P1/3rp3/7R/b4pRn/5R1p/QRRRRRR1
Input: James Malcom, 2020-11-12
Last update: Rainer Staudte, 2020-11-12 more...

71 - P1382903
Andrey Frolkin
Andrew Buchanan
2 Die Schwalbe 360-1, p. 737, 12/2020

(14+12)
Erster Zug des wTf6?

R: 1. Tf1xBf6! b6xSa5 2. 0-0! a7xSb6 3. Lf1-e2 Kd4-e5,Kf4-e5 4. e2-e3+
play all

James Malcom: How does this work exactly? What forbids the rook from just making some random tempi move in a game that leads to this position? (2020-12-12)
Mario Richter: James, think of time pressure. In the diagram, Black has only two retractions (a7xSb6xSa5). The only way to unlock the position is the retraction of e2-e3.
Little hint: castling is considered as a king m,opve ... (2020-12-12)
Henrik Juel: By now there are so many clues revealed for this fine retro that I dare to give a retroplay despite the Byzantine dating, in this case indicating an ongoing solving competition
R: 1.Tf1xPf6 b6xSa5 2.0-0 a7xSb6 3.Lf1-e2 Kd4,Kf4 4.e2-e3+ etc.
Incidentally, TxP is not the first move, but the last... (2020-12-12)
Henrik Juel: I missed the from square in the retraction by the black king, sorry
3... Kd4-e5,Kf4-e5 (2020-12-12)
A.Buchanan: Ha, there is no solving competition for these either. But it's to avoid Gerd's solving competition protection algorithm picking up false positives (2020-12-12)
A.Buchanan: TxP happens to be the last move, but it's also the first effective move of the rook, as it is considered to be a *passenger* in the castling, and not to have moved yet. Otherwise can't get first move of a rook fixed if it capturing (except possibly by DP logic). See the explanatory article: https://www.dieschwalbe.de/download/artikel/Passenger_Rooks.pdf (2020-12-12)
A.Buchanan: Your solution is completely correct, Henrik! (2020-12-12)
comment

Keywords: Economy record (First move), Type A, First Move? (TxB), Castling in the retro play (wk), Non-standard material (l), Castling (wk)
Genre: Retro
FEN: 5b1n/1p2prBP/P2PrRQb/p2pk1pR/7p/3PP3/1P2B1PP/6K1
Reprints: 2 Die Schwalbe Online 12/2020
Input: A.Buchanan, 2020-12-12
Last update: A.Buchanan, 2023-08-15 more...

72 - P1382904
Andrey Frolkin
Andrew Buchanan
3 Die Schwalbe 360-1, p. 737, 12/2020

(14+10)
Erster Zug des wTf6?

R: 1. Lg2-f3 b4-b3 2. Tf1xSf6! b5-b4 3. 0-0! b6-b5 4. Lf1-g2 Kf4-g5,Kh4-g5 5. g2-g3+
play all

Henrik Juel: Oh, I was confused by the LLLLl, which should be TLLLLl, I believe
R: 1.Lg2-f3 b4-b3 2.Tf1xSf6! b5-b4 3.0-0 b6-b5 4.Lf1-g2 Kf4-g5,Kh4-g5 5.g2-g3+ (2020-12-12)
A.Buchanan: Thanks for the catch. I copied the diagrams straight from the article FEN, so should be clean of transcription errors, but then I put in the non-standard material field by hand & eye, so could be other errors as here. (2020-12-12)
A.Buchanan: Your move sequence is again correct! :D (2020-12-12)
more ...
comment

Keywords: Economy record (First move), Type A, First Move? (TxS), Castling in the retro play (wk), Non-standard material (TLLLLl), Castling (wk)
Genre: Retro
FEN: 3bRBB1/2ppBQRp/3ppRBb/6kB/6p1/1p3BP1/4P2P/6K1
Reprints: 3 Die Schwalbe Online 12/2020
Input: A.Buchanan, 2020-12-12
Last update: A.Buchanan, 2023-08-15 more...

73 - P1382906
Andrey Frolkin
Andrew Buchanan
4 Die Schwalbe 360-1, p. 738, 12/2020

(14+9)
Erster Zug des wTf8?

R: 1. Tf1xLf8! e4-e3 2. 0-0! e5-e4 3. Lf1-g2 e6-e5 4. g2xBh3 h4-h3 and e.g. 5. d4-d5 h5-h4 6. Le4-c6 h6-h5 7. c7-c8=L! h7-h6 8. c6-c7 c7xLb6
play all

Henrik Juel: Good motivation for TxL
R: 1.Tf1xLf8! e4-e3 2.0-0 e5-e4 3.Lf1-g2 e6-e5 4.g2xPh3 h4-h3 and e.g.
5.d4-d5 h5-h4 6.Le4-c6 h6-h5 7.c7-c8=L! h7-h6 8.c6-c7 c7xLb6
f7xTg8=L happened early (2020-12-12)
comment

Keywords: Economy record (First move), Type A, First Move? (TxL), Castling in the retro play (wk), Non-standard material (LL), Castling (wk)
Genre: Retro
FEN: k1B2RQ1/Pp1pp1p1/rpB3N1/pN1P4/8/4p2P/2P1P1BP/6K1
Reprints: 4 Die Schwalbe Online 12/2020
www.thbrand.de 13/12/2020
Input: A.Buchanan, 2020-12-12
Last update: A.Buchanan, 2023-08-15 more...

74 - P1382907
Andrey Frolkin
Andrew Buchanan
5 Die Schwalbe 360-1, p. 738, 12/2020

(13+12)
Erster Zug des wTf6?

R: 1. Tf1xTf6 c3-c2 2. Lf3-a8 c4-c3 3. 0-0 c5-c4 4. Lg2-f3 c6-c5 5. Lf1-g2 Kf4-g5,Kh4-g5 6. g2-g3+
play all

Hans-Jürgen Manthey: 1. Lg2-a8 c3-c2 2. Tf1xTf6 c4-c3 3. O-O ??? (Rochade nicht möglich wegen sTf6 !)

mögliche Lösung:
1. Tf1xTf6 c3-c2 2. Lf3-a8 c4-c3 3. O-O c5-c4 4. Lg2-f3 c6-c5 5. Lf1-g2 Kf4-g5 6. g2-g3+ Sg5-h7 7. Ld3-g6 Se4-g5 8. Th7-g7 Dg6-f7 9. f7-f8L Tf5-f6 10. Le5-h8 Lf8-h6 11. Lh4-e7 Dg5-g6 12. La7-e5 Tf6-f5 13. Lb8-a7 Th6-f6 14. Lf6-d8 Sc5-e4 15. Lb2-f6 Dd8-g5 16. Lf2-h4 Kg5-f4 17. f6-f7 Sa6-c5 18. Te7-h7 Th8-h6 19. f5-f6 Kh6-g5 20. La3-b2 Kg7-h6 21. Lf7-e8+ Kf6-g7 22. Lc1-a3 Kg7-f6 23. b7-b8L h7-h5 24. La7-f2 Kf6-g7 25. Lb8-a7 Kg7-f6 26. b6-b7 Kf6-g7 27. b7-b8L Kg7-f6 28. Te8-e7 Df6-d8 29. Ta8-e8 g5-g4 30. Le8-f7 f7xSe6 31. Sf4-e6+ Sb8-a6 32. Ta1-a8 Dd8-f6 33. e7-e8L Kf6-g7 34. e6-e7 Ke7-f6 35. b5-b6 g6-g5 36. b6-b7 g7-g6 37. c4xLb5 La6-b5 38. c2-c4 Lc8-a6 39. La6-d3 Ke8-e7 40. Lb7-a6 Ke7-e8 41. La8-b7 Ke8-e7 42. a7-a8L Ke7-e8 43. d5xTe6 Te3-e6 44. a6-a7 Ke8-e7 45. a5-a6 Ke7-e8 46. a4-a5 Ke8-e7 47. a2-a4 Ta3-e3 48. Sh3-f4 Ta8-a3 49. Sg1-h3 b7xSc6 50. Sa7-c6 Sc6-b8 51. Sb5xa7 e7xDd6 52. Dh6-d6 Sb8-c6 53. Dd2-h6 Sc6-b8 54. Dd1-d2 Sb8-c6 55. f4-f5 Sc6-b8 56. f2-f4 Sb8-c6 57. d4-d5 Sc6-b8 58. d2-d4 Sb8-c6 59. Sc3-b5 Sc6-b8 60. Sb1-c3 Sb8-c6 61. b5-b6 Sc6-b8 62. b4-b5 Sb8-c6 63. b2-b4 (2020-12-14)
more ...
comment

Keywords: Economy record (First move), Type A, First Move? (TxT), Castling in the retro play (wk), Non-standard material (LLLLL), Castling (wk)
Genre: Retro
FEN: B2BBBnB/2ppBqRn/3ppRBb/6kp/6p1/6P1/2p1P2P/6K1
Reprints: 5 Die Schwalbe Online 12/2020
Input: A.Buchanan, 2020-12-12
Last update: A.Buchanan, 2023-08-15 more...

75 - P1382908
Andrey Frolkin
Andrew Buchanan
6 Die Schwalbe 360-1, p. 738, 12/2020

(11+14)
Erster Zug des wTf6?

R: 1. Tf1xDf6 b3xLc2 2. Le4-c2 and e.g. 2. ... c5-c4 3. Lf3-e4 c6-c5 4. 0-0 b4-b3 5. Lg2-f3 b5-b4 6. Lf1-g2 Kf4-g5 7. g2-g3+
play all

more ...
comment

Keywords: Economy record (First move), Type A, First Move? (TxD), Castling in the retro play (wk), Non-standard material (L), Castling (wk)
Genre: Retro
FEN: 3BBn2/2pRBrPn/3pQRrb/3pp1kp/2p3p1/6P1/2p1P2P/6K1
Reprints: 6 Die Schwalbe Online 12/2020
Input: A.Buchanan, 2020-12-12
Last update: A.Buchanan, 2023-08-15 more...

76 - P1382910
Andrey Frolkin
Andrew Buchanan
8 Die Schwalbe 360-1, p. 740, 12/2020

(16+6)
Erster Zug des wTf3?

R: 1. Tf1xBf3+! f4-f3 2. f3xBe4+ e5-e4 3. 0-0! Kg2-g3
play all

Henrik Juel: White captured TxPf3+, axbxcxd, bxcxd, cxd, fxPe, g5xh6, and h6xg7-g8=L
R: 1.Tf1xPf3+ f4-f3 2,f3xPe4+ e5-e4 3.0-0 Kg2-g3 (2020-12-12)
comment

Keywords: Economy record (First move), Type C, First Move? (TxB), Castling in the retro play (wk), Non-standard material (DTLL), Castling (wk)
Genre: Retro
FEN: 3N4/ppp4P/4NBpB/5BQp/4P1BR/R3QRk1/3PP3/6K1
Reprints: 8 Die Schwalbe Online 12/2020
Input: A.Buchanan, 2020-12-12
Last update: A.Buchanan, 2023-08-15 more...

77 - P1382914
Andrey Frolkin
Andrew Buchanan
12c Die Schwalbe 360-1, p. 741, 12/2020

(16+8)
Erster Zug des wTf2?

R: 1. Tf1xDf2+ Dg3-f2+ 2. Lf2xBb6 b7-b6 3. 0-0! Dh2-g3
play all

Minor correction: sBd7->c6 wSb2->wL
Henrik Juel: Not R: 1.Tf1xDf2+ Dg3-f2+ 2.Lf2xPb6 b7-b6 3.0-0 Dh2-g3,
because White can no longer uncapture hxgxh
What was the intention? (2020-12-13)
A.Buchanan: Attempted repair to avoid accidentally retro-blocking c8 (2020-12-23)
Hans-Jürgen Manthey: mögliches Retrospiel: 1. Tf1xDf2# Dg3-f2 2. Lf2xb6+ b7-b6 3. O-O Dh2-g3 4. Se3-g2 Dg2-h2 5. Sc4-e3 Dh2-g2 6. Tg1-g4 Dg2-h2 7. Sa3-c4 Dh2-g2 8. g4-g5 Dg2-h2 9. Lb6-f2 Dh2-g2 10. Ld8-b6 Ke3-f3 11. d7-d8L Kd4-e3 12. Sc3-e2+ Kc5-d4 13. Le2-d1 Kd6-c5 14. Lf1-e2 Tf2-d2 15. Tg2-g1 Tf3-f2 16. Td2-g2 Se2-c1 17. Td1-d2 Te3-f3 18. Tb1-d1 Te6-e3 19. Lc1-b2 Th6-e6 20. f2-f4 Th8-h6 21. g2-g4 Sf4-e2 22. Se2-f3 Sd5-f4 23. Sg1-e2 Ke6-d6 24. Df4-h4 Ta8-h8 25. Da4xBf4 f5-f4 26. Da5-a4 Db8-h2 27. g4xTh5 h4-h3 28. b2-b3 Sb3-a1 29. Dd8xBa5 Sc5-b3 30. Df8-d8 a7-a5 31. Dh8xLf8 f7-f5 32. d6-d7 Kd7-e6 33. e5xBd6 Sf6-d5 34. Dh7-h8 Ke8-d7 35. De4-h7 Sg8-f6 36. Ta1-b1 Dd8-b8 37. Sb1-a3 Th8-h5 38. h3xLg4 h5-h4 39. h2-h3 Lc8-g4 40. De2-e4 h7-h5 41. e4-e5 c7-c6 42. d2-d3 Sa6-c5 43. Dd1-e2 d7-d6 46. e3-e4 Sb8-a6 47. e2-e3 (2020-12-25)
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Keywords: Economy record (First move), Type C, First Move? (TxD), Castling in the retro play (wk), Non-standard material (S), Castling (wk)
Genre: Retro
FEN: 8/4p1p1/1Bp5/6PP/5PRQ/1P1P1k1p/PBPrNRN1/n1nB2K1
Reprints: 12 Die Schwalbe Online 12/2020
Input: A.Buchanan, 2020-12-12
Last update: A.Buchanan, 2023-08-15 more...

78 - P1382915
Andrey Frolkin
Andrew Buchanan
13 Die Schwalbe 360-1, p. 741, 12/2020

(15+10)
Erster Zug des wTf3?

R: 1. Tf1xDf3+! Sf2-h1 2. 0-0! Se4-f2 and e.g. 3. Sf2-h3 Lh3-g4 4. Lg4-h5 Th5-g5 5. g5-g6 Th6-h5 6. Lh5-g4
play all

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comment

Keywords: First Move? (TxD), Type C, Castling in the retro play (wk), Non-standard material (t), Castling (wk)
Genre: Retro
FEN: 8/4p2p/6P1/5PrB/5pbb/1PPPkRRN/1PPr2Pr/2BQ2Kn
Reprints: 13 Die Schwalbe Online 12/2020
Input: A.Buchanan, 2020-12-12
Last update: A.Buchanan, 2023-08-15 more...

79 - P1383157
Mike Curtis
105 Schach , p. 49, 09/2020
Lobende Erwähnung
Corona Kompositionsturnier 2020

(10+6)
#4

1. Lxf3! Tdxf3 2. Ta1+ Ta3 3. Txa3+ Txa3 4. Txa3#
1. ... Tfxf3 2. Th8+ Tf8 3. Txf8+ Txf8 4. Txf8#
play all

Dieses Problem konkurrierte um den Sonderpreis, aber leider ist der Td1 überflüssig. Die verrückte Diagrammstellung musste jedoch verewigt werden!

Henrik Juel: C+ Popeye 4.61 (but many duals in short variations) (2020-12-20)
comment

Keywords: Capture key, Non-standard material
Genre: n#
FEN: k7/3R1r1R/8/1R1R1r1B/8/1r1r1r1R/8/1R1R1R1K
Input: Rainer Staudte, 2020-12-20
Last update: Rainer Staudte, 2020-12-20 more...

80 - P1383163
Collin Colbow
160 Schach , p. 50, 09/2020
Lobende Erwähnung
Corona Kompositionsturnier 2020

(4+1) C+
#5

1. Lh5 Kc8 2. Kc6 Kd8 3. Lh3 Ke7 4. Lg7 Kd8 5. Lf6#
2. ... Kb8 3. Le5+ Ka7 4. Le2 Ka8 5. Kb6#
3. ... Kc8 4. Lh3+ Kd8 5. Lf6#
play all

more ...
comment

Keywords: Non-standard material, Rex solus (s), Aristocrat
Genre: n#
Computer test: Popeye 4.61
FEN: 3k4/8/3K4/8/8/2B5/6B1/3B4
Input: Rainer Staudte, 2020-12-20
Last update: Alfred Pfeiffer, 2020-12-21 more...

81 - P1383238
Nikolay S. Zinovyev
14195 Ideal-Mate Review 93-94 01/2004

(5+1) C+
#9

1. Kc6! Kd4 2. Sc5 Ke5 3. Se4 Kd4 4. Sf2 Ke5 5. Sh3 Kd4 6. Shf4 Ke5 7. Sg2 Kd4 8. Se1 Ke5 9. Sf3#
play all

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comment

Keywords: Non-standard material, Rex solus (s), Stalemate dissolution
Genre: n#
Computer test: Gustav 4.1d, Brute Force
FEN: 8/1N4N1/8/2KNk3/8/3P4/8/8
Input: Rainer Staudte, 2020-12-23
Last update: Alfred Pfeiffer, 2020-12-23 more...

82 - P1384466
Nicolas Dupont
The Problemist 2017-2018
1. Preis

(15+13) C+
BP in 25,5

Henrik Juel: Solution
1. Bf2-f4 Bg7-g5 2. Bf4-f5 Bg5-g4 3. Bf5-f6 Bg4-g3
4. Bf6xe7 Bg3xh2 5. Bg2-g4 Bf7-f5 6. Bg4-g5 Bf5-f4
7. Bg5-g6 Bf4-f3 8. Bg6-g7 Ke8-f7 9. Be7-e8=T Sg8-e7
10. Bg7-g8=S Se7-g6 11. Sg8-f6 Th8-g8 12. Bc2-c4 Sg6-h8
13. Bc4-c5 Tg8-g3 14. Bc5-c6 Lf8-g7 15. Bc6xd7 Bc7-c5
16. Ba2-a4 Dd8-c7 17. Bd7-d8=T Sb8-d7 18. Ba4-a5 Sd7-b6
19. Ba5-a6 Lc8-d7 20. Ba6xb7 Ba7-a5 21. Bb7-b8=S Ba5-a4
22. Sb8-c6 Ta8-b8 23. Te8-g8 Sb6-a8 24. Sf6-e8 Tb8-b3
25. Td8-b8 Ba4-a3 26. Sc6-d8 (2020-12-31)
Henrik Juel: C++ Euclide 1.01 (2020-12-31)
comment

Keywords: Unique Proof Game, Non-standard material (TTSS)
Genre: Retro
Computer test: Stelvio 1.2, 25sec
FEN: nR1NN1Rn/2qb1kbp/8/2p5/8/pr3pr1/1P1PP2p/RNBQKBNR
Input: fs/hg, 2020-12-30
Last update: Reto, 2023-05-18 more...

83 - P1388234
Jozef Lozek
575 PAT 27 12/1999

(13+11) C+
#19

1. Lb7+! Kxb7 2. Lxc6+ Kc8 3. Lb7+ Kxb7 4. Lxd5+ Kc8 5. Lb7+ Kxb7 6. Lxe4+ Kc8 7. Lb7+ Kxb7 8. Lxf3+ Kc8 9. Lb7+ Kxb7 10. Lxg2+ Kc8 11. Lb7+ Kxb7 12. Dh1+ Kc8 13. Da8+ Sb8 14. Dxb8+ Kd7 15. Db5+ Kc8 16. Da6+ Kd7 17. Dc6+ Kc8 18. Lxd6+ Dc7 19. Dxc7#
play all

Reprint: http://www.jurajlorinc.com/chess/or27we2.htm#uloha3

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comment

Keywords: Non-standard material, Checking key, Flight giving sacrifice key, Perpetual check, Sacrifice of white pieces, Line opening, x pieces move to one square (6 on b7), Switchback (k), corner to corner (D)
Genre: n#
Computer test: Gustav 4.1d
FEN: B1krN1KQ/p1Bnq3/2pb4/3pPP2/BN2n3/5p2/B5p1/1B1B3B
Input: James Malcom, 2021-04-07
Last update: Arnold Beine, 2021-04-07 more...

84 - P1389099
Silverbyte
Discord Chess Problems & Studies Server 4/4/2021
8. Platz
CP&S Discord Server Composition Tourney 0 {}

(9+7) C+
#3

1. Df4+ Sxf4 2. exf4+ Kf6 3. Ld4#
play all

more ...
comment

Keywords: Joke, Non-standard material (Ds), Ornament (mate position)
Genre: 3#
Computer test: Henrik Juel: C+ Popeye 4.61 C+ Popeye 4.61 1.Df4+ Sxf4 2.exf4+ Kf6 3.Ld4# joke: non-standard material ornament: mate position
FEN: 2q2n2/3bn3/2r1n3/4k3/2Q1B1Q1/2P1PK2/3RP3/6B1
Reprints: MatPlus.net Forum 4
Input: A.Buchanan, 2021-04-30
Last update: Alfred Pfeiffer, 2021-07-27 more...

85 - P1389106
Ethan Donaghue
Discord Chess Problems & Studies Server 4/4/2021
15. Platz
CP&S Discord Server Composition Tourney 0 {}

(15+10)
Gewinn
("White to move and win (-:)

Henrik Juel: 1.Da8# (2021-04-30)
comment

Keywords: Joke, Illegal position, Non-standard material (TTTLLdddddd)
Genre: Studies
FEN: 1k1q1q2/1pq3q1/1p6/2q3q1/3q1N2/5BBB/Q4PPP/RRB1RRKR
Reprints: MatPlus.net Forum 4/4/2021
Input: A.Buchanan, 2021-04-30
Last update: Alfred Pfeiffer, 2021-07-28 more...

86 - P1389698
Andrew Buchanan
Retros mailing list 04/2007
after Bernd Schwarzkopf

(12+10)
Last 15 single moves?
Duplex

See http://abrobecker.free.fr/chess/lengths.pdf
Henrik Juel: R: 1.h7-h8=L Lg1-h2 2.h6-h7 Lh2-g1 3.h5-h6 Lg1-h2 4.h4-h5 Lh2-g1 5.h3-h4 Lg1-h2 6.h2-h3 h3xLg2 7.Lh1-g2 h4-h3 8.Lg2-h1
R: 1... Lg1-h2 2.h7-h8=L Lh2-g1 3.h6-h7 Lg1-h2 4.h5-h6 Lh2-g1 5.h4-h5 Lg1-h2 6.h2-h4 h3xLg2 7.Lh1-g2 h4-h3 8.Lg2-h1 h5-h4 (2021-08-18)
comment

Keywords: Last Moves?, Type D, Non-standard material (l), Obvious promotion (Ll)
Genre: Retro
FEN: 7B/1p1p2p1/8/8/1P6/1PPPkPP1/NPK1bppb/NQn2b2
Reprints: VIII Length Records in Last Single Moves? 11/2009
Input: A.Buchanan, 2021-05-17
Last update: A.Buchanan, 2021-10-13 more...

87 - P1390557
Geir Sune Tallaksen Østmoe
Discord Chess Problems & Studies Server 02/05/2021
1. Platz
Discord Composition Tourney 1

(8+7)
#1

1. Sg4#

Coordinator Edderiofer: "A knight-wheel with four initially-pinned pieces being unpinned in four variations. With four unpins and a discovered check, this does necessitate a promoted piece of some sort, so this problem would likely only have been submittable to this competition (which specifically allowed for promoted pieces in the diagram). Well done!"
Henrik Juel: C+ Popeye 4.61 (2021-09-30)
more ...
comment

Keywords: Non-standard material (TL)
FEN: K2R2B1/7Q/2pbp3/3kN2R/2pn4/8/6r1/3R3B
Input: A.Buchanan, 2021-06-08
Last update: Alfred Pfeiffer, 2021-09-30 more...

88 - P1390559
Adrian Storisteanu
Discord Chess Problems & Studies Server 02/05/2021
Motto: "Broken record"
2.-3. Platz
Discord Composition Tourney 1

(10+6)
#1

1. Dxa1#

Henrik Juel: C+ Popeye 4.61 (2021-09-30)
more ...
comment

Keywords: Non-standard material (Dl), Aristocrat
FEN: K4Q2/2Q1b2b/4Q3/1Q4Q1/3k1b2/Q4Q2/b1Q5/b3Q3
Input: A.Buchanan, 2021-06-08
Last update: Alfred Pfeiffer, 2021-09-30 more...

89 - P1390561
Guus Rol
Andrew Buchanan
Discord Chess Problems & Studies Server 02/05/2021
5th Place
Discord Composition Tourney 1

(15+9)
#1

1. Dd2!#
1. 0-0-0?#
R: 1. Kc3-d3 De4-b4+ ( 2. Kd3-c3 Db4-e4 retro loop)
2. Kb2-c3 Lb4-a3+ ( 3. Kc3-b2 La3-b4+ retro loop)
3. Kb1-b2 Ta2-a1,Ta3-a1+
play all

Authors' solution: hey wait: so is there a dual? Well no. What was Black's last move? Let's look at all the captures & promotions first:
White: captured P promoted RRRRRBS
Black: captured QRRBBSS promoted -

bPs all on original columns: no black cross-captures. So 7 wPs captured once and promoted. The exception must have been poor wPh, because it can't get past bPh anyway, and was waylaid on its starting file by an officer. Other wPs captured as axb, bxc, cxd, dxc/e, exd, fxe, gxh before promoting.

The sequence of bP moves must have been one of:
(i) bPc6 (allows wPd to pass) then bPd5 (allows promoted rooks to escape) then bPe6 (when all the rooks are out, letting wPf to pass)
(ii) bPe6 then bPd5 then bPc6.

So which? In (i) the units promoting late on e8 & h8 must have been S & B, as the door was closed on escaping rooks. But e8 is a light square, and h8 is blocked by bPg7 which never moved. So neither could have promoted to B. Therefore it was option (ii), pawn move sequence roughly:
bPe6 & bPh6
gxh=R, fxe=R, dxe=R,
bPd5
exd=R, cxd=R
5 Rs all exit
bPc6
bxc=S
bPb6
axb=B

Bottom line: all the bP moves and captures were historical, and so it must be bK which just moved. We can now use Retractor 2 program from Theodore Hwa at http://xenon.stanford.edu/~hwatheod/retractor2/retractor.html to validate our manual analysis of the retro play, ignoring any suggestions which involve capture. So wRa had already moved: no castling now.

Henrik Juel: Black captured [Ph2] with an officer
The other white pawns captured all missing black men to promote seven times
Last move was not made by a black pawn as this would ruin the promotions, so it was Kc3-d3
Retroplay: 1... Kc3-d3 2.De4-b4+ Kb2-c3! 3.Lb4-a3+ Kb1-b2! 4.Ta3-a1+ or Ta2-a1+ (other K retractions just postpone the inevitable), so 1.0-0-0 is illegal
1.Dd2#
Good problem, maybe the best in the tourney (2021-06-08)
A.Buchanan: Thanks Henrik. Can you figure out which pawns promoted to which kind of officers on which squares? (2021-06-09)
Henrik Juel: No, I would expect there were several feasible promotion patterns
But the need to move [Pb7c7d7e7] very carefully can easily make your suggestion correct
Offhand I do not see the right sequence, so you are welcome to enlighten me (2021-06-10)
Henrik Juel: I think I got it
(promote [Pg2] to rook on h8 at some early time)
first e7-e6, promote [Pd2f2] to rooks on e8
then d7-d5, promote [Pc2e2] to rooks on d8
get all promoted rooks out
finally [Pb2] promotes to knight on c8 and [Pa2] to bishop on b8 (2021-06-10)
A.Buchanan: Exactly! If you try the other way round, there’s nowhere to promote B (2021-06-10)
comment

Keywords: Non-standard material (TTTTTLS), Cant Castler
Genre: Retro
Computer test: HC+ Popeye v4.85 Retractor v2.0 + thinking
FEN: 8/p4pp1/1pp1p2p/1RBpR3/RQ3RB1/BN1k4/2N3NR/R3K2R
Reprints: Facebook 28/05/2021
Input: A.Buchanan, 2021-06-08
Last update: A.Buchanan, 2021-06-11 more...

90 - P1390565
Marken Foo
Discord Chess Problems & Studies Server 02/05/2021
9. Platz
Discord Composition Tourney 1

(10+10)
#1

1. Dg4#

Henrik Juel: C+ Popeye 4.61 (2021-09-30)
more ...
comment

Keywords: Non-standard material
FEN: 2q3rQ/2Bp1nr1/b7/6Q1/p2k4/4NR2/3pP1K1/NQR1b3
Input: A.Buchanan, 2021-06-08
Last update: Alfred Pfeiffer, 2021-09-30 more...

91 - P1390685
Göran Wicklund
8800 Phénix 310-311, p. 12108, 09-10/2020

(16+12) C+
BP in 19.5

1. c4 a5 2. c5 a4 3. c6 a3 4. cxb7 c5 5. f4 Sc6 6. b8=T Lc8-a6 7. f5 Lc4 8. f6 Lb3 9. fxe7 c4 10. exf8=T= Ke7 11. h4 Kd6 12. h5 Df6 13. h6 Sge7 14. hxg7 h5 15. g8=T h4 16. Tg5 Tg8 17. Tgb5 Tg3 18. Tg8 Sg6 19. Tbf8 Td8 20. Tb8
play all

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comment

Keywords: Unique Proof Game, Non-standard material (TTT), Interchange (TTT), konsekutive Umwandlungen 3 (TTT)
Genre: Retro
Computer test: C+ Euclide 1.01
FEN: 1R1r1RR1/3p1p2/2nk1qn1/8/2p4p/pb4r1/PP1PP1P1/RNBQKBNR
Input: A.Buchanan, 2021-06-09
Last update: A.Buchanan, 2021-10-22 more...

92 - P1391114
Gerard Johan Bouma
Tim Krabbé's Website #102 17/03/2001
Gewidmet Tim Krabbe

(3+4)
#5
b) sBa7->g7

a) 1. Dg7? 0-0-0!

1. Dc5! Kd7,Kd8 2. Dd6+ Kc8 3. Dc6+ Kd8 4. Kf7 ... 5. Lf7#

b) 1. Dc5? Kd7,Kd8 2. Dd6+ Kc8 3. Dc6+ Kd8 4. Kf7 Ta7+!

1. Dxg7! Kd8 2. Ld6 Ta7 3. Dxa7 and mate in two
play all

https://timkr.home.xs4all.nl/chess2/diary_6.htm

KrabbéProudly presenting: a problem, dedicated to me, by the prominent Dutch composer Gerard Bouma, who has already often been very helpful when I wanted to illustrate the problem art in these pages.
Trying to solve these elegant miniature twins gave me a pleasure that I invite the reader to share. I did solve them (found the ways to mate Black in time), but I confess that I missed the wittiest point of the whole thing.
In a), 1.Qg7 (Kd8 2.Bd6 etc.) is defeated by O-O-O! Therefore: 1.Qc5 Kd7 2.Qd6+ Kc8 3.Qc6+ Kd8 4.Kf7 and 5.Be7 mate
In b), this doesn't work because Black has 4...Ra7+ Now, however, White can play 1.Qxg7 There follows 1...Kd8 2.Bd6 Ra7 3.Qxa7 and mate in two more moves. But can't Black castle here? That is what this problem is really about. He can't. If he could, his last move should have been with the Pf6. If it was f7-f6, then the white King, in its march to g8, would necessitate the black King to have been away from e8 temporarily. If the Pf6 captured to f6 in its last move (this is what I forgot), then the Bf8 must be a promoted Pf7 - also proving the black King must at some time have moved. No castling.
Thanks to those readers who sent me solutions - most of them entirely correct.

Duplicate Diagram: P1169710

A.Buchanan: See the duplicate diagram. Interesting if such a complementary twin only arrived 8 years later. (2021-06-27)
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comment

Keywords: Castling, Cant Castler, Miniature, Non-standard material (Retro play dependent)
Genre: n#, Retro
FEN: r3kBK1/p7/5p2/8/8/8/8/6Q1
Input: James Malcom, 2021-06-26
Last update: A.Buchanan, 2024-02-26 more...

93 - P1391301
Brian E. Chamberlain
R450 The Problemist 09/2012
dedicated to J.Ling

(12+14) C+
BP in 16.0

1. Sb1-c3 Sg8-f6 2. Sc3-d5 Sf6-e4 3. Sd5xe7 Se4xd2 4. Ke1xd2 a7-a5 5. Kd2-c3 a5-a4 6. Kc3-b4 Sb8-a6 7. Kb4-a5 Lf8xe7 8. e2-e4 0-0 9. Dd1-h5 f7-f5 10. Lf1-e2 f5-f4 11. Le2-g4 f4-f3 12. Sg1-e2 f3xe2 13. Th1-d1 Tf8-f3 14. Td1-d5 Tf3-a3 15. Td5-b5 e2-e1=L+ 16. b2-b4 a4xb3ep#
play all

more ...
comment

Keywords: Unique Proof Game, Valladao Task, Castling, En passant, under-promotion (l), Non-standard material (l)
Genre: Retro
Computer test: Euclide 1.01, no solution in 15.0
FEN: r1bq2k1/1pppb1pp/n7/KR5Q/4P1B1/rp6/P1P2PPP/R1B1b3
Input: A.Buchanan, 2021-07-03
Last update: Alfred Pfeiffer, 2021-11-26 more...

94 - P1391731
Mirko Degenkolbe
Frank Fiedler
Bulletin 07/2021
1. Platz, Abteilung Orthodox
Victory-Thematurnier zum virtuellen Sachsentreffen 2021
PR: Die Teilnehmer des TT.

(5+2) C+
#5
b) wBa4 statt wSa4

a) 1. Sa2! Kxa2 2. Sbc4 Ka1 3. Kxe4 Ka2 4. Sc3+ Ka1 5. Sb3#
b) 1. Sdc4+! Kb4 2. Kd4 e3 3. Sbd3+ Kxa4 4. Kc5 e2 5. Sdb2#
play all

(MD1510)

Formschönes „V“, Springeropfer im Gib-Nimm-Schlüssel und Mustermatt-Abschluss. (F. Fiedler)
Frank steuerte den Zwilling bei und wurde zum Mitautor.

Forderung: Konstruiere ein Schachproblem deiner Wahl (außer Märchenschach) in Gestalt eines V (=
Victory) und besiege das Coronavirus der zweiten Welle.

Das Turnier fand im Frühjahr 2021 statt. Initiator und Turnierleiter war erneut Matthias Hentschel.

Preisbericht in: Broschüre "Preisberichte C-Turnier und V-Turnier", udv (Udo Degener Verlag) 2021
Henrik Juel: C+ Popeye 4.61 (2021-07-15)
comment

Keywords: Symbol problem (V), Flight giving and taking key, Model mate, Minimal, Miniature, Non-standard material, Forsberg Twins, Knight sacrifice
Genre: s#
FEN: 8/8/8/8/N3p3/k3K3/1N1N4/2N5
Input: Felber, Volker, 2021-07-14
Last update: Alfred Pfeiffer, 2022-01-27 more...

95 - P1392138
Daniele Gatti
Phénix 316 03/2021
4. Lob
Yves Tallec Memorial

(14+9)
s#17

1. Lc3-d2+! Kc1-b1 2. 0-0+ Lb3-d1 3. Ta7xa1+ Kb1xa1 4. Tb7-a7+ Ka1-b1 5. Ta7-a1+ Kb1xa1 6. Tc7-a7+ Ka1-b1 7. Ta7-a1+ Kb1xa1 8. Td7-a7+ Ka1-b1 9. Ta7-a1+ Kb1xa1 10. Te7-a7+ Ka1-b1 11. Ta7-a1+ Kb1xa1 12. Tf7-a7+ Ka1-b1 13. Ta7-a1+ Kb1xa1 14. Tg7-a7+ Ka1-b1 15. Ta7-a1+ Kb1xa1 16. Th7-a7+ Ka1-b1 17. Le8-g6+ Th6xg6#
play all

Judge Michel Caillaud

Henrik Juel: Popeye 4.61 with 'opt thr 0 non 0 1' found no flaws (2021-07-26)
comment

Keywords: Non-standard material, Checking key
Genre: s#
FEN: 4B2r/RRRRRRRR/3b3r/3p4/1R1N4/1bB1p3/1p6/n1k1K2R
Input: Marcin Banaszek, 2021-07-26
Last update: Marcin Banaszek, 2022-08-08 more...

96 - P1392139
Daniele Gatti
Phénix 316 03/2021
5. Lob
Yves Tallec Memorial

(10+2) C+
s#20

1. Sf2-g4+! Kh6-g5 2. Sc5-e4+ Kg5-h4 3. Sg1-f3+ Kh4-h3 4. Sh5-f4+ Se2xf4 5. Se4-f2+ Kh3-g3 6. Sf2-h1+ Kg3-h3 7. Sf3-g1+ Kh3-h4 8. Se7-f5+ Kh4-g5 9. Sd4-f3+ Kg5-g6 10. Sg4-e5+ Kg6-f6 11. Se5-d7+ Kf6-g6 12. Sf5-e7+ Kg6-h6 13. Se7-g8+ Kh6-g6 14. Sf3-e5+ Kg6-g5 15. Sd6-e4+ Kg5-h4 16. Sg7-f5+ Kh4-h5 17. Se4-f6+ Kh5-g5 18. Sf6-h7+ Kg5-h5 19. Sf5-g7+ Kh5-h4 20. Se5-g6+ Sf4xg6#
play all

Judge Michel Caillaud

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comment

Keywords: Non-standard material, just one species, Aristocrat, Minimal (s)
Genre: s#
Computer test: Popeye 4.61, with 'opt thr 0 non 0 1' found no flaws
FEN: 7K/4N1N1/3N3k/2N4N/3N4/4N3/4nN2/6N1
Input: Marcin Banaszek, 2021-07-26
Last update: Marcin Banaszek, 2022-08-08 more...

97 - P1395012

8 International Solving Match 1946

(10+11) C+
#2

s. Anmerkung zu P1395005
Henrik Juel: White pawns on the diagram captured all five missing black men
Black pawns on the diagram captured five of the six missing white men, so there remains one black capture
A black promotion on a dark square is necessary
The missing two white and two black pawns originated on the a-file and either the b-file or the h-file
There are four possibilities to consider
1. [Pa2,Pb2,Pa7,Pb7] bxa, no long castling
2. [Pa2,Pb2,Pa7,Ph7] Yxa, no castlings
3. [Pa2,Ph2,Pa7,Pb7] bxa or Yxa, no long castling
4. [Pa2,Ph2,Pa7,Ph7] impossible
Conclusion: no long castling
Three solutions, 1.0-0,Kd1,Kf1 (2021-10-29)
A.Buchanan: Nice clear solution, Henrik! Pity the retro implications aren't more interesting.
Distinction between "obvious promotion" & "non-standard material".
Would be good to have keyword for intended "multiple solutions" outside h#, perhaps.
If author not given, maybe record as Anonymous? (2021-10-31)
Henrik Juel: I see little need for 'Anonymous'
Of course, someone must have composed each problem, and not stating an author just means that we don't know the name(s) (2021-10-31)
A.Buchanan: Hi Henrik. I had wondered about that argument, and then I thought: if the article didn't give a name, we should reflect that. Otherwise we are conflating with two other cases (1) PDB entry accidentally omits a known name, or (2) the name is unknown because we don't have the primary source. But up to you :) (2021-10-31)
comment

Keywords: Non-standard material (l), Cant Castler (wg), Quasi-symmetrical position
Genre: 2#, Retro
Computer test: HC+ Popeye v4.87 + trivial retro-logic
FEN: 4r3/2bprpb1/3pkp2/3p1p2/3P1P2/3P1P2/B2P1P2/R3K2R
Input: Mario Richter, 2021-10-29
Last update: A.Buchanan, 2021-10-31 more...

98 - P1395677
Bernhard Marik
3 International Solving Match 1948

(13+12)
#2

1. Da1,Dxb6,Dc3,Dd2,Df2
1. Ta1,Tb1,Tc1,Td1,Te1,Tf2,Tf3
1. Tg6
1. Lf8
1. Lg3
1. Sd4-b3+,Sd4-b5+,Sd4-c2+,Sd4-e2+,Sd4-f3+,Sd4xf5+,Sd4xe6+,Sd4-c6+
1. Sd6-c4+,Sd6-f7+
1. Sf6-d7+
1. Sf4-d3+
1. Sf4-e2+,Sf4-g2+,Sf4-h3+,Sf4-h5+,Sf4-g6+,Sf4xe6+,Sf4xd5+
1. axb8=D,axb8=T,axb8=L,axb8=S 1. bxa8=D,bxa8=T,bxa8=L,bxa8=S
play all

84 Punkte (42 Lösungen)
Die Falle hier für die Löser war, daß man denken könnte, die Stellung sei illegal.
Aber die Stellung ist legal.
1. e4 a5 2. e5 a4 3. d4 a3 4. d5 axb2 5. a4 h5 6. a5 h4 7. a6 h3 8. a7 hxg2 9. Ne2 g1=B 10. Ra6 f5 11. h4 f4 12. h5 f3 13. Bg2 fxg2 14. h6 Bh2 15. h7 g1=N 16. Rh6 c6 17. dxc6 b6 18. f4 Na6 19. f5 d6 20. exd6 Bb7 21. c4 Rb8 22. c5 Ba8 23. dxe7 Rb7 24. cxb7 Bb8 25. c6 Kf7 26. e8=N Ne7 27. Nbc3 b1=N 28. f6 Ke6 29. Bf4 Nb4 30. Qc1 Qd4 31. c7 Nbd5 32. Bh2 g6 33. f7 Qg7 34. Nf4+ Ke5 35. Nce2 Nf5 36. Nd4 Be7 37. Nf6 Rc8 38. f8=B Bd8 39. Be7 Nd2 40. h8=N Nh3 41. Nd7+ Ke4 42. Nf7 Nb4 43. Nh5 Kd5 44. Nd6 Ne4 45. Bg1 g5 46. Ndf6+ Ke5 47. Nf4 Nd5 48. Bh2 g4 49. Qb2 Nhg5 50. 0-0 Ne6

Henrik Juel: Each side has promoted to LSS, and Mario's proof game shows that you can even keep [Ke1,Th1] stationary until the very end (2021-11-10)
comment

Keywords: Non-standard material, Allumwandlung
Genre: 2#, Retro
FEN: bbrb4/PPP1B1q1/1p1NnN1R/3nkn2/3NnNp1/8/1Q5B/5RK1
Input: Mario Richter, 2021-11-10
Last update: Alfred Pfeiffer, 2021-11-11 more...

99 - P1397579
Frank Richter
Mirko Degenkolbe
1556 harmonie 97, p. 213, 03/2009
4. Lob

(3+12) C+
ser-h#26

1. Tgh3 2. Lg3 3. Th4 4. T2h3 5. Lh2 6. Lg1 7. Kh2 8. Kg3 9. Th1 10. T4h2 11. h4 12. h3 13. Kh4 14. Tg3 15. Thg2 16. h2 17. Th3 18. Kg3 19. Th6 20. Te6 21. Txe4 22. Te6 23. Th6 24. Th3 25. h5 26. h4 Se4#
play all

MD626
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comment

Keywords: Seriesmover, Non-standard material (t)
Genre: Fairies
Computer test: Popeye 4.61
FEN: 8/7p/8/6pp/4Pppb/2N2pr1/5prr/5K1k
Input: Felber, Volker, 2021-12-29
Last update: James Malcom, 2021-12-30 more...

100 - P1397776
Klaus-Peter Zuncke
3277 Kieler Nachrichten 18/02/1995

(5+1) C+
#4

1. Sd4! Kxd4 2. Tc3 Kd5 3. Sb2 Kd4 4. Td3#
1. ... Kd3 2. Sa5 Kxd4 3. Tc3 Kd5 4. Td3# 2. ... Ke3 3. Sab3 Kd3 4. Tc3#
play all

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comment

Keywords: Non-standard material, Aristocrat, Miniature, Flight giving sacrifice key, Rex solus
Genre: n#
Computer test: Juel: Popeye 4.61
FEN: 8/1N6/8/1N3K2/N7/4k3/2R5/8
Reprints: 453 Problemschach-Jahrbuch 1995 D , p. 180, 1996
Input: Rainer Staudte, 2022-01-02
Last update: Dieter Berlin, 2023-06-18 more...

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