Die Schwalbe

89 problem(s) found in 2489 milliseconds (displaying 89 problem(s)). [COMMENTDATE>=20220810 AND NOT A='Beuthner, Richard' AND K='Nicht-Partiesatzmaterial'] [download as LaTeX]

1 - P0000034
Joachim Brügge
5468 Die Schwalbe 98 04/1986
P0000034
(13+12) C+
BP in 17,0
Wem gewidmet?
1. f4 a5 2. f5 a4 3. f6 a3 4. fxe7 axb2 5. exd8=S bxa1=S 6. Sxb7 Sf6 7. g4 Sxg4 8. Lb2 Se3 9. Sf3 Sc4 10. Lxg7 Lc5 11. Sa5 Lg1 12. Ld4 Lb7 13. Lf2 Tg8 14. Sd4 Lf3 15. c3 Sc6 16. Sc2 Tc8 17. Sb3 Sd4
play all play one stop play next play all
6S make "S"; 4L make "L"
"SL" = Sam Loyd
Ryan McCracken: Cooked...Nf6/Nh6 is one of many move defects. (2001-09-13)
Moldenhauer: Computerprüfung: Cooked Stevio 1.2 1 Sekunde.
Keine Lösung: BP 16.0, BP 16.5.
Beispiel Notation:1.f4 Sc6 2.Sf3 Sf6 3.f5 Tg8 4.g4 Sxg4 5.f6 a5 6.fxe7 a4 7.exd8=S a3
8.Sxb7 axb2 9.Sa5 bxa1=S 10.Lb2 Lb7 11.Lxg7 Lc5 12.Sd4 Se3 13.c3 Sc4 14.Sc2 Lg1
15.Ld4 Tc8 16.Lf2 Sd4 17.Sb3 Lf3.
Die Idee mit den Buchstaben SL im Diagramm finde ich super! (2023-05-20)
A.Buchanan: Yes I like the letter idea, which can only work in German. Do you think this was intentionally a non-unique PG? Given the triumphs of the unique PG genre, such problems do not impress, but it wouldn't be "cooked". Or maybe we should classify all non-unique PGs here as cooked? What do you think? (2023-05-21)
Henrik Juel: Testing gives the result 'cooked'
This problem is correct in the sense that all shortest proof games last 17.0 moves
Still the current C+ is rather misleading
I suggest no label, neither C+ nor cooked (2023-05-21)
Moldenhauer: Ich nehme an, dass die Absicht es Sam Loyd zu widmen, das Ziel war.
Deshalb für diese Ausführung C+. Wenn der Autor selbst angibt das es nur
einen Lösungsweg gibt ist die Aufgabe cooked. NUPG haben andere
Schachproblemfreunde festgestellt und als Schlüsselwort angegeben. Oder irre ich? (2023-05-21)
Olaf Jenkner: Machine translation is very poor as far as problem chess is concerned. (2023-05-23)
A.Buchanan: Hi Moldenhauser. Non-unique PGs are uncooked if 1) the move total is correct, (2) the intended theme appears in every shortest solution. For a problem like this where the theme is the final diagram, the second is vacuous. In 1986 some unique PGs were being already published, and I t can be difficult to discern the intention of the composer but I think this one was intended to be non-unique. I don’t think any non-unique PG can be classed as C+. (2023-05-23)
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Keywords: Non-standard material, Promotion, Non-Unique Proof Game, Symbolproblem Endstellung (SL)
Genre: Retro
Computer test: Computerprüfung: Cooked Stevio 1.2 1 Sekunde. Keine Lösung: BP 16.0, BP 16.5.
FEN: 2r1k1r1/2pp1p1p/8/8/2nn4/1NP2b2/P1NPPB1P/nN1QKBbR
Input: Gerd Wilts, 1995-06-03
Last update: A.Buchanan, 2023-05-23 more...
2 - P0000112
Dmitri W. Pronkin
Andrey Frolkin
6386v Die Schwalbe 113 10/1988
P0000112
(14+14) cooked
BP in 45.0
1. f4 g5 2. f5 g4 3. f6 g3 4. fxe7 gxh2 5. g4 d5 6. g5 d4 7. g6 d3 8. g7 dxc2 9. d4 f5 10. Lf4 c1=T 11. Lg3 Tc6 12. Dd3 Tg6 13. Da6 Sf6 14. g8=L c5 15. Lb3 c4 16. d5 Kf7 17. e8=T c3 18. Te4 c2 19. Ta4 c1=L 20. e4 Lf4 21. Sd2 h5 22. 0-0-0 h4 23. Te1 h3 24. Ld1 Th4 25. d6 L8h6 26. d7 Dh8 27. d8=T Le6 28. Tc8 S8d7 29. Tc2 Kg8 30. e5 Lf7 31. e6 Tf8 32. e7 Lb8 33. e8=S f4 34. Te7 f3 35. Se2 f2 36. Tg1 h1=S 37. b4 h2 38. Lh3 f1=S 39. b5 Sf2 40. b6 h1=L 41. bxa7 b6 42. a8=L Lb7 43. Th1 Lc8 44. Lag2 Se3 45. Lf1 S6e4
play all play one stop play next play all
Cook: 1. b4 c5 2. b5 c4 3. b6 c3 4. bxa7 d5 5. e4 d4 6. f4 d3 7. f5 dxc2 8. d4 g5 9. Lf4 c1=L 10. d5 g4 11. f6 g3 12. fxe7 gxh2 13. g4 c2 14. Lg3 Lf4 15. g5 c1=T 16. g6 Tc6 17. Dd3 f5 18. Sd2 h5 19. g7 Tg6 20. 0-0-0 Sf6 21. Te1 h4 22. d6 h3 23. g8=L Th4 24. Lb3 L8h6 25. Ld1 Kf7 26. d7 Dh8 27. d8=T Le6 28. Td4 Sbd7 29. e5 Tf8 30. e8=T Kg8 31. Tc8 Lf7 32. e6 b6 33. e7 Lb8 34. e8=S f4 35. Te7 f3 36. Se2 f2 37. Tg1 h1=S 38. Da6 h2 39. Lh3 f1=S 40. Ta4 Sf2 41. Tc2 h1=L
Michel Caillaud: cooked by Stelvio 0.93 :
1.b4 c5 2.b5 c4 3.b6 c3 4.bxa7 d5 5.e4 d4 6.f4 d3 7.f5 dxc2 8.d4 g5 9.Lf4 c1=L 10.d5 g4 11.f6 g3 12.fxe7 gxh2 13.g4 c2 14.Lg3 Lf4 15.g5 c1=T 16.g6 Tc6 17.Dd3 f5 18.Sd2 h5 19.g7 Tg6 20.0-0-0 Sf6 21.Te1 h4 22.d6 h3 23.g8=L Th4 24.Lb3 L8h6 25.Ld1 Kf7 26.d7 Dh8 27.d8=T Le6 28.Td4 Sbd7 29.e5 Tf8 30.e8=T Kg8 31.Tc8 Lf7 32.e6 b6 33.e7 Lb8 34.e8=S f4 35.Te7 f3 36.Se2 f2 37.Tg1 h1=S 38.Da6 h2 39.Lh3 f1=S 40.Ta4 Sf2 41.Tc2 h1=L... (2022-12-20)
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Keywords: Unique Proof Game, Move Length Record, Non-standard material, Castling, Promotion (tLTlTSsslL)
Genre: Retro
FEN: 1bb1Nrkq/3nRb2/Qp4rb/8/R3n2r/4n1BB/P1RNNn2/2KB1B1R
Reprints: 583 Ukrainisches Album 1986-1990
80 Shortest Proof Games 11/1991
Input: Gerd Wilts, 1995-06-03
Last update: Silvio Baier, 2023-03-02 more...
3 - P0000136
Dmitri W. Pronkin
Andrey Frolkin
6631v Die Schwalbe 117 06/1989
Preis
P0000136
(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 play one stop play next 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...
4 - P0000254
Leonid M. Borodatow
7642 Die Schwalbe 133 02/1992
P0000254
(16+10)
Welches waren die letzten 7 Einzelzüge, wenn dabei keine Zugwiederholungen vorkamen?
R: 1. 0-0-0# Ke4-d4 2. e5xf6ep+ f7-f5 3. Tg6-b6+ Kf5-e4 4. c7-c8=L
play all play one stop play next play all
Die von einigen Lösern angeführte Abweichung 2. f5-f6+ Kd4-e4 3. Lh6-g7+ (und mehrdeutig weiter) ließe sich durch die Erweiterung '... keine Zugwiederholungen und keine Pendelzüge ...' (mühsam) kitten. Beim Autor hieß es bei dieser ich-weiß-nicht-wie-vielten Fassung nur 'letzte 9 (!) Einzelzüge ohne Wiederholung).
HHS meint ohnehin, daß es das ganze auch ohne die einengende Zusatzbedingung schon gibt.
Das von einem Löser angegebene 1. Ld3-h7# Th1-h8 2. Lh8-g7 Tg1-h1 3. Se1-g3 g2-g1=T 4. Th7-h8=L scheitert allerdings an der Schlagbilanz.
Anton Baumann: Neufassung vergl. P0006288 (2023-01-06)
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Keywords: En passant, Last Moves?, Non-standard material, Castling (wl), Promotion (L), Valladao Task (WWW)
Genre: Retro
FEN: qrB2brr/Bp2p1BB/pR3P2/1Q6/2Pk1P2/B1p2R2/2P3N1/2KR1N2
Input: Gerd Wilts, 1995-06-03
Last update: Rainer Staudte, 2019-08-11 more...
5 - P0000404
Michel Caillaud
Die Schwalbe 80 04/1983
P0000404
(11+15) C+
BP in 45,0
1. Sf3 a5 2. Sd4 a4 3. Sb3 axb3 4. a3 Ta4 5. Ta2 bxa2 6. Tg1 axb1=S 7. Th1 Sc3 8. Tg1 Sd5 9. Th1 Sb6 10. Tg1 Sa8 11. Th1 b6 12. Tg1 La6 13. Th1 Dc8 14. Tg1 Db7 15. Th1 Df3 16. gxf3 h5 17. Lh3 h4 18. Le6 h3 19. La2 Lc4 20. Lb1 La2 21. b3 Thh4 22. Lb2 Thb4 23. Lf6 gxf6 24. Kf1 Lh6 25. Kg1 Kf8 26. Df1 Kg7 27. Dg2+ hxg2 28. h4 Kg6 29. Kh2 g1=S 30. Kg2 Lf4 31. h5+ Kg5 32. Th4 Lh2 33. Td4 Sh3 34. f4+ Kh4 35. Kf3 Sg5+ 36. Ke3 Kh3 37. h6 Kg2 38. h7 Kf1 39. h8=T Sh7 40. Kf3 Ke1 41. Kg2 Kd1 42. Kf1 Kc1 43. Ke1 Kb2 44. Kd1 Ka1 45. Kc1 Lg1
play all play one stop play next play all
Reto: This is now the new record for the longest computer tested SPG. Strategy seeking takes up all the time, playing the 800 strategies on the other hand is done within a few seconds. (2023-08-11)
Reto: With the upcoming v1.6, this is solved by Stelvio in around 20min. The improvement is due to the fact that the cage in the south-west is now detected (either the wRa1 is captured inside the cage or the wBc1 is captured at home) (2023-09-02)
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Keywords: Unique Proof Game, Move Length Record, Non-standard material (ss), Promotion (ssT)
Genre: Retro
Computer test: Stelvio 1.5 in about 2.5 days.
FEN: nn4nR/2pppp1n/1p3p2/8/rr1R1P2/PP6/b1PPPP2/kBK3b1
Input: Gerd Wilts, 1995-06-03
Last update: A.Buchanan, 2023-08-12 more...
6 - P0000411
Andrey Frolkin
4429 Die Schwalbe 82 08/1983
2. Lob
P0000411
(9+13) cooked
BP in 40,0
1. d4 e5 2. d5 f5 3. d6 Le7 4. dxe7 d5 5. e4 d4 6. Dg4 fxg4 7. c4 d3 8. c5 Dd6 9. b4 Kd7 10. cxd6 c5 11. b5 c4 12. b6 Sc6 13. e8=T d2+ 14. Ke2 c3 15. Kd3 d1=L 16. Sd2 Sd4 17. Tf8 Kc6 18. Tf4 exf4 19. e5 h5 20. e6 Lb3 21. e7 Lf7 22. bxa7 b5 23. e8=T b4 24. Te6 b3 25. Th6 gxh6 26. d7 b2 27. d8=T Lce6 28. Td5 Te8 29. Kc4 b1=L 30. a8=T Lh7 31. Ta3 c2 32. Tg3 Se7 33. a4 Thf8 34. a5 Sg6 35. a6 Sh8 36. a7 fxg3 37. a8=T gxh2 38. T8a3 Lhg8 39. Th3 gxh3 40. Se4 Lxd5+
play all play one stop play next play all
Cook: 1. b4 e5 2. d4 Le7 3. d5 f5 4. d6 h5 5. dxe7 d5 6. b5 Dd6 7. b6 Kd7 8. bxa7 b5 9. c4 b4 10. c5 d4 11. cxd6 c5 12. e8=T Sc6 13. Tf8 c4 14. e4 d3 15. Dg4 d2+ 16. Ke2 c3 17. Kd3 d1=L 18. Sd2 fxg4 19. Tf4 exf4 20. e5 Sd4 21. e6+ Kc6 22. e7 b3 23. e8=T b2 24. Te6 Lb3 25. Th6 Lf7 26. d7+ gxh6 27. d8=T Lce6 28. Td5 Te8 29. Kc4 b1=L 30. a8=T Lh7 31. Ta3 c2 32. Tg3 Se7 33. a4 Thf8 34. a5 Sg6 35. a6 Sh8 36. a7 fxg3 37. a8=T gxh2
38. T8a3 Lhg8 39. Th3 gxh3 40. Se4 Lxd5+
Moldenhauer: Computerprüfung: Cooked Stelvio 1.6 29:20:32 Stunden. (hh:mm:ss)
Da NUPG C+
Notation: 1.b4 e5 2.d4 Le7 3.d5 f5 4.d6 h5 5.dxe7 d5 6.b5 Dd6 7.b6 Kd7 8.bxa7 b5
9.c4 b4 10.c5 d4 11.cxd6 c5 12.e8=T Sc6 13.Tf8 c4 14.e4 d3 15.Dg4 d2+ 16.Ke2 c3
17.Kd3 d1=L 18.Sd2 fxg4 19.Tf4 exf4 20.e5 Sd4 21.e6+ Kc6 22.e7 b3 23.e8=T b2
24.Te6 Lb3 25.Th6 Lf7 26.d7+ gxh6 27.d8=T Lce6 28.Td5 Te8 29.Kc4 b1=L 30.a8=T Lh7
31.Ta3 c2 32.Tg3 Se7 33.a4 Thf8 34.a5 Sg6 35.a6 Sh8 36.a7 fxg3 37.a8=T gxh2
38.T8a3 Lhg8 39.Th3 gxh3 40.Se4 Lxd5+
3 schwarze Läufer stehen zum Schluss auf den weißen Felder d5, f7, g8. (2023-09-21)
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Keywords: Non-Unique Proof Game, Ceriani-Frolkin Theme (TTTTT), Non-standard material (ll), Promotion (TlTTlTT)
Genre: Retro
FEN: 4rrbn/5b2/2k4p/3b3p/2KnN3/7p/2p2PPp/R1B2BNR
Input: Gerd Wilts, 1995-06-03
Last update: James Malcom, 2023-09-22 more...
7 - P0000684
Simo Ylikarjula
2531 Die Schwalbe 52 08/1978
P0000684
(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 play one stop play next 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...
8 - P0000763
Lothar Finzer
1159 Die Schwalbe 24 12/1973
P0000763
(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 play one stop play next 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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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...
9 - P0001114
Michel Caillaud
3676 Die Schwalbe 71 10/1981
3. ehrende Erwähnung
P0001114
(13+12)
#1
Mars-Circe
Gerald Ettl: 1.h8D# (2023-04-03)
Gerald Ettl: die Stellung loest sich auf indem der sK nach b1 - g8 wandert und dann Sg5 weg zieht. Der wK kommt ueber g5 raus. (2023-04-03)
Michel Caillaud: The original stipulation is #1 (durch wen?).
As wPe2 cannot be captured on its file, the 4 white captures for 4 Pawns to promote to Knights are (a2)xb3, (e2)xf3 and (f2)xg3 2 times, and wPb2 was captured on its file by (Dd8)xb6.
As b3-b2 (before (a2xb3)) and c7-c6 (before (Dd8)xb6) cannot be immediately retracted, only bK and wSs can play the last moves.
As indicated by Gerald, bK has to go to g8 to unlock the position, freeing bSg5.
When Ka3-a2 is retracted, previous white move places the 6 white Knights on black squares; the resulting Retro-Opposition implies that black is to play in the diagram position.
1.b1S#! (1g8D#?) (2023-04-04)
Gerald Ettl: Danke Michel fuer Dein Erklärung.
Ich löse so auf, dass Schwarz am Rückzug ist:
R: 1.Kc1b1 Se4d6 2.Bb2b3 Sc5d3 3.Kb1a2 Sd3c1 4.Ka2b1 Sh1f2 5.Kb1a2 Sa4c5 6.Bb3b4 Sf5e3 7.Ka2a3 La1d4 8.Ka3a4 Sf2h1 9.Ka4a5 Sh1f2 10.Ka5b6 Sf2h1 11.Kb6c7 Sh1f2 12.Kc7d8 Sf2h1 13.Kd8e8 Sh1f2 14.Ke8f8 Sf2h1 15.Kf8g8 Sh1f2 16.Sg5f3 Kh6g5 17.Sb8a6 Sc5a4 18.Sa6c5 Sd6b5 19.Sc5b3 Sb5c7 20.Sb3a1 Sc7a6 21.Sa1b3 Sa6b8 22.Sb3a1 Sa4b6 23.Sa1b3 Sb6c8 24.Sb3a1 Sb8b7[+wBb7] 25.Sa1b3 Bb7a6[+sLb7] 26.Sb3a1 Sc8c7[+wBc7] 27.Lb7c8 Kg5h4 28.Sa1b3 Tg6g5 29.Sb3a1 Tg5f5 30.Sa1b3 Tf5f4 31.Tg7g5 Sf2h1 32.Tg5b5 Sh1f2 33.Tb5b8 Sf2h1 34.Bb4b5 Sh1f2 35.Bb5b7 Bc7b6[+sLc7] 36.Tb8a8 Tf4e4 37.Lc7f4 Sg3f5 38.Kg8f8 Sf2h3 39.Lf4h6 Sc1e2 40.Kf8e8 Se2g3 41.Lh6f8 Sf5h6 42.Sb3a1 Sh6g8 43.Sa1b3 Sg8g7[+wBg7] 44.Sb3a1 Bg7g6 45.Sa1b3 Bg6f5[+sTg6] 46.Tg6g8 Bf5f4 47.Tg8h8 Sg3f5 48.Sb3a1 Sf5h6 49.Sa1b3 Sh6g8 50.Sb3a1 Sg8g7[+wBg7] 51.Bg4g5 Bg7g6 52.Bf6g7[+wDf6] Lh5g4 53.Sa1b3 Bh7h6 54.Sb3a1 Bh6h5 55.Bg5h6[+wTg5]
warum geht das nicht? Den Zug b1S# habe ich vorher ueberhaupt nicht gesehen. (2023-04-04)
Gerald Ettl: Jetzt habe ich es gesehen: der wBa2 musste ja von a2 geschlagen haben. (2023-04-04)
comment
Keywords: Circe (Mars), Non-standard material, Promotion
Genre: Retro, Fairies
FEN: 1n6/p2ppprP/2p2pRK/2N2NnB/N3N1p1/6N1/1pPP4/B1k4N
Input: Gerd Wilts, 1995-06-03
Last update: A.Buchanan, 2019-02-03 more...
10 - P0001270
Matti Arvo Myllyniemi
142 Europe Echecs 84 01/1966
P0001270
(15+15) C+
BP in 9.5
1. e3 d5 2. Lc4 d4 3. Se2 d3 4. 0-0 dxc2 5. d4 Kd7 6. d5 Kd6 7. Dd4 Sd7 8. Ld2 c1=L 9. Lb4+ c5 10. dxc6ep+
play all play one stop play next play all
more ...
comment
Keywords: Unique Proof Game, En passant, Non-standard material (l), Castling (wk), Promotion (l), Valladao Task (sww)
Genre: Retro
Computer test: Ergänzung Stelvio 1.2 C+: Keine Lösung: BP 8.5, 9.0. 10. dxc6ep++ Doppelschach.
FEN: r1bq1bnr/pp1npppp/2Pk4/8/1BBQ4/4P3/PP2NPPP/RNb2RK1
Reprints: 92 Shortest Proof Games 11/1991
Input: Gerd Wilts, 1995-06-03
Last update: A.Buchanan, 2023-05-25 more...
11 - P0001427
Karl Fabel
Am Rande des Schachbretts 1947
P0001427
(13+14) C+
BP in 41,5
1. Sf3 a5 2. Sd4 a4 3. Sb3 axb3 4. a3 Ta4 5. Ta2 bxa2 6. Tg1 axb1=S 7. Th1 Sc3 8. Tg1 Sb5 9. Th1 Sa7 10. Tg1 b5 11. Th1 Lb7 12. Tg1 Ld5 13. Th1 La2 14. b3 h5 15. Lb2 h4 16. Lf6 h3 17. Lh4 Sf6 18. Da1 Sh5 19. Df6 Tf4 20. Da6 e6 21. Kd1 Dg5 22. Kc1 Dg3 23. hxg3 Lc5 24. gxf4 Le3 25. Lg3 Ke7 26. Lh2 Kf6 27. g3 Kf5 28. Lg2 Kg4 29. La8 Sbc6 30. Kb2 Tb8 31. Ta1 Lb1 32. Lg1 h2 33. Kc3 Kh3 34. Kd3 Kg2 35. Ke4 Kf1 36. Kf3 Ke1 37. Kg4 Kd1 38. Kg5 f6+ 39. Kg6 Kc1 40. Kf7 Sd8+ 41. Ke8 Kb2 42. Ta2+
play all play one stop play next play all
Sally: Eine eindeutige BwP., die lange Zeit den Längenreord hielt und, wenn auch mit langer Verzögerung, wesentlich zum Boom dieser Gattung in den letzten 15 Jahren beigetragen hat. Im-
mer noch eine faszinierende Aufgabe. Nr. KF-13 Schwalbe Okt. 2005. (2011-12-05)
Moldenhauer: Ergänzung: Keine Lösung: BP 40.5, BP 41.0. (2023-05-20)
comment
Keywords: Unique Proof Game, Move Length Record, Non-standard material, Promotion
Genre: Retro
Computer test: Stelvio 1.17, in 3h.
FEN: Br1nK3/n1pp2p1/Q3pp2/1p5n/5P2/PP2b1P1/RkPPPP1p/1b4B1
Reprints: 1366 FIDE Album 1945-1955 1964
301 Europe Echecs 200 07/1975
(VIII) feenschach 28 05-07/1975
feenschach 38 04-06/1977
78 Shortest Proof Games 11/1991
17a 64 Proof Games 2012
Input: Gerd Wilts, 1995-06-03
Last update: Reto, 2023-04-14 more...
12 - P0001569
Andrey Frolkin
439v Europe Echecs 310 10/1984
Lob
P0001569
(12+14) cooked
BP in 27,0
1. f4 h5 2. f5 h4 3. f6 h3 4. fxe7 f5 5. d4 Kf7 6. e8=T Kg6 7. Te6+ Kh5 8. Ta6 bxa6 9. Dd2 Lb7 10. e4 Lc6 11. e5 La4 12. e6 Sc6 13. e7 Db8 14. e8=T Db3 15. Te5 Te8 16. d5 Te6 17. dxe6 Lb4 18. Ta5 Lc3 19. Lb5 f4 20. e7 f3 21. e8=T f2+ 22. Ke2 f1=S 23. Tb8 Sxh2 24. Tb6 cxb6 25. Sf3 bxa5 26. Se5 Sf3 27. Sg4 Sfd4+
play all play one stop play next play all
Cook: 1. f4 h5 2. f5 h4 3. f6 h3 4. fxe7 f5 5. e4 Kf7 6. e8=T f4 7. Te6 f3 8. Ta6 bxa6 9. e5 Kg6 10. e6 Lb7 11. e7 Lc6 12. e8=T La4 13. Te5 Sc6 14. Ta5 Db8 15. d4 Db3 16. Lb5 f2 17. Ke2 f1=S 18. Sf3 Te8 19. Se5 Kh5 20. d5 Te6 21. dxe6 Sxh2 22. e7 Sf3 23. e8=T Lb4 24. Tb8 Lc3 25. Tb6 cxb6 26. Sg4 bxa5 27. Dd2 Sd4
more ...
comment
Keywords: Ceriani-Frolkin Theme (TTT), Unique Proof Game, Non-standard material, Promotion (s)
Genre: Retro
Computer test: Computerprüfung: Cooked Stelvio 1.11 1 Sekunde. Keine Lösung: BP 26.0, BP 26.5.
FEN: 6nr/p2p2p1/p1n5/pB5k/b2n2N1/1qb4p/PPPQK1P1/RNB4R
Reprints: 21 Shortest Proof Games 11/1991
Input: Gerd Wilts, 1995-06-03
Last update: A.Buchanan, 2023-05-08 more...
13 - P0001629
Andrey Frolkin
498 Europe Echecs 355/356 07-08/1988
2. ehrende Erwähnung
P0001629
(14+14) C+
BP in 26,5
1. Sc3 c5 2. Sd5 c4 3. Sxe7 c3 4. Sg6 hxg6 5. Sf3 Th5 6. Sd4 Ta5 7. Sb5 f5 8. Sa3 Df6 9. Sb1 La3 10. Tg1 d6 11. Th1 Ld7 12. Tg1 La4 13. Th1 Kd7 14. Tg1 Kc6 15. Th1 Kb5 16. Tg1 Sc6 17. Th1 Te8 18. Tg1 Te3 19. Th1 Td3 20. cxd3 c2 21. Tg1 cxd1=S 22. Th1 Sc3 23. Tg1 Se4 24. Th1 Dc3 25. Tg1 Sgf6 26. Th1 Se8 27. Tg1
play all play one stop play next play all
Moldenhauer: Computerprüfung: C+ Stelvio 1.11 1 Sekunde.
Keine Lösung: BP 25.5, BP 26.0. (2023-04-02)
comment
Keywords: Unique Proof Game, Non-standard material, Pendulum (T x15), Promotion, Impostor (S)
Genre: Retro
Computer test: Stelvio 1.11
FEN: 4n3/pp4p1/2np2p1/rk3p2/b3n3/b1qP4/PP1PPPPP/RNB1KBR1
Reprints: 502 Europe Echecs 358 10/1988
102 Shortest Proof Games 11/1991
Input: Gerd Wilts, 1995-06-03
Last update: James Malcom, 2023-05-02 more...
14 - P0001641
Francois Brassaud
510 Europe Echecs 367/368 07/1989
A. Hazebrouck gewidmet
P0001641
(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 play one stop play next 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 ...
comment
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...
15 - P0001750
Michel Caillaud
Markus Johannes Ott
3710 feenschach 63 12/1982
K. Widlert gewidmet
2. Preis
P0001750
(10+15) C+
BP in 24.5
1. Sf3 a5 2. Sd4 a4 3. Sb3 axb3 4. Sc3 bxc2 5. Se4 cxd1=S 6. Sg5 Se3 7. Sxh7 Sxf1 8. Sg5 Th5 9. Sh7 Tha5 10. Kd1 e5 11. Kc2 Lb4 12. Kd3 d6 13. Ke4 Sd7 14. Kf5 Sdf6+ 15. Kg5 Kd7 16. Tb1 Se8+ 17. Kg4 Kc6+ 18. Kf3 Kb5 19. Ke4 Ka4 20. Kd3 b5 21. Kc2 Lf5+ 22. Kd1 Lxb1 23. Ke1 f5 24. Sf6 gxf6 25. b3#
play all play one stop play next play all
13-zügiges Tempoverlustmanöver des wK.
Moldenhauer: Computerprüfung: C+ Stelvio 1.2 18 Sekunden.
Keine Lösung: BP 23.5, BP 24.0. (2023-05-12)
more ...
comment
Keywords: Unique Proof Game, Promenade (K), Non-standard material, Tempo Loss (K13), Promotion
Genre: Retro
Computer test: Euclide 0.93
FEN: r2qn1n1/2p5/3p1p2/rp2pp2/kb6/1P6/P2PPPPP/1bB1Kn1R
Reprints: 985 FIDE Album 1980-1982 1988
58 Shortest Proof Games 11/1991
3384 U.S. Problem Bulletin 102/103 07-10/1995
Input: Gerd Wilts, 1995-06-03
Last update: James Malcom, 2021-02-15 more...
16 - P0001870
Dmitri W. Pronkin
Rex Multiplex 1985
3. ehrende Erwähnung
P0001870
(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 play one stop play next 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...
17 - P0002241
Michel Caillaud
3817 feenschach 65 15/05/1983
1. ehrende Erwähnung
P0002241
(13+14) C+
BP in 34,0
1. f4 a5 2. f5 Ta6 3. f6 Tb6 4. fxg7 f5 5. h4 Sf6 6. g8=T Kf7 7. Tg6 Se8 8. Tc6 dxc6 9. h5 Dd4 10. h6 Dg7 11. hxg7 h5 12. g8=T h4 13. Tg4 h3 14. Ta4 h2 15. e4 Th3 16. La6 Ta3 17. d3 Kg8 18. Lh6 f4 19. Kd2 Lh3 20. g4 Lg2 21. Sh3 Sd7 22. Te1 h1=S 23. g5 Sg3 24. g6 Sf5 25. g7 Kh7 26. g8=T Sfd6 27. Tg5 Sc8 28. Tb5 cxb5 29. b3 bxa4 30. Kc3 Tb5 31. Sd2 Sdb6 32. Tc1 Sa8 33. Kc4 b6 34. c3 Tb4+
play all play one stop play next play all
Renny Bosch: This problem together with P0002238 and P0002243 form a lovely triad in each of which the rightmost three white pawns promote to a common target (Q's, R's, or B's) which subsequently get captured. Studying their similarities and differences, and what it took to make each one work, gives one a good appreciation of the art of SPG composition.

To see them all at once, enter
PROBID='P0002238' OR PROBID='P0002241' OR PROBID='P0002243'
into the search window on the home page.  (2008-03-23)
Moldenhauer: Computerprüfung: C+ Stelvio 1.11 00;56:06 Minuten. (hh:mm:ss)
Keine Lösung: BP 33.0, BP 33.5. (2023-04-19)
Reto: With Stelvio 1.33, solving time drops to 20sec (2023-06-10)
comment
Keywords: Ceriani-Frolkin Theme (TTT), Unique Proof Game, Non-standard material, Promotion (sTTT)
Genre: Retro
Computer test: Stelvio 1.33, 20sec
FEN: n1n1nb2/2p1p2k/Bp5B/p7/prK1Pp2/rPPP3N/P2N2b1/2RQR3
Reprints: 20 Shortest Proof Games 11/1991
Input: Gerd Wilts, 1995-06-03
Last update: Reto, 2023-06-19 more...
18 - P0002277
Karlheinz Bachmann
v Die Schwalbe 104, p. 217, 04/1987
1. ehrende Erwähnung
P0002277
(11+15) C+
BP in 48,0
1. Sf3 a5 2. Sd4 a4 3. Sb3 axb3 4. a3 Ta4 5. Ta2 bxa2 6. Tg1 axb1=S 7. Th1 Sc3 8. Tg1 Sd5 9. Th1 Sb6 10. Tg1 Sa8 11. Th1 b6 12. Tg1 La6 13. Th1 Dc8 14. Tg1 Db7 15. Th1 Df3 16. gxf3 h5 17. Lh3 h4 18. Le6 h3 19. La2 Lc4 20. Lb1 La2 21. b3 Sa6 22. Lb2 Sc5 23. Lf6 gxf6 24. Kf1 Lh6 25. Kg1 Kf8 26. Df1 Kg7 27. Dg2+ hxg2 28. h4 Kg6 29. Kh2 g1=S 30. Kg2 Lf4 31. h5+ Kg5 32. h6 Lg3 33. h7 Sh6 34. Th4 Tb8 35. Tb4 Tb7 36. f4+ Kh4 37. h8=T Sf3 38. Tg8 Se5 39. Tg5 Sg6 40. Kf3 Kh3 41. Ke3 Kg2 42. Te5 Kf1 43. Kf3 Ke1 44. Kg2 Kd1 45. Kf1 Kc1 46. Ke1 Kb2 47. Kd1 Ka1 48. Kc1 Sh8
play all play one stop play next play all
paul: Correction of P0000067. (2018-03-03)
Reto: The new length record for a fully tested SPG. (2023-09-18)
Olaf Jenkner: How long does it take with one core and how many cores did you use? (2023-09-18)
Reto: I used 15 seekers and 15 players, but not all of them are active all the time. My guess is that it takes about 7-10h single-threaded. (2023-09-19)
comment
Keywords: Unique Proof Game, Move Length Record, Non-standard material, Promotion (Tss)
Genre: Retro
Computer test: Stelvio 1.66 in 23min (heavily parallelized)
FEN: n6n/1rpppp2/1p3p1n/2n1R3/rR3P2/PP4b1/b1PPPP2/kBK5
Reprints: 82 Shortest Proof Games 11/1991
Input: Gerd Wilts, 1995-06-03
Last update: Reto, 2023-09-18 more...
19 - P0002337
Michel Caillaud
4019 Die Schwalbe 76 08/1982
Dr. Karl Fabel zum Gedenken
1. Preis
P0002337
(11+15) C+
BP in 47,0
1. Sf3 a5 2. Sd4 a4 3. Sb3 axb3 4. a3 Ta4 5. Ta2 bxa2 6. Tg1 axb1=S 7. Th1 Sc3 8. Tg1 Sd5 9. Th1 Sb6 10. Tg1 Sa8 11. Th1 b6 12. Tg1 La6 13. Th1 Dc8 14. Tg1 Db7 15. Th1 Df3 16. gxf3 h5 17. Lh3 h4 18. Le6 h3 19. La2 Lc4 20. Lb1 La2 21. b3 Thh4 22. Lb2 Thb4 23. Lf6 gxf6 24. Kf1 Lh6 25. Kg1 Kf8 26. Df1 Kg7 27. Dg2+ hxg2 28. h4 Kg6 29. Kh2 g1=S 30. Kg2 Lf4 31. h5+ Kg5 32. Th4 Lh2 33. Td4 Sh3 34. f4+ Kh4 35. Kf3 Sg5+ 36. Ke3 Kh3 37. h6 Kg2 38. h7 Kf1 39. h8=T Ke1 40. Th5 Sh7 41. Ta5 Kd1 42. Ta7 Kc1 43. Tb7 Ta7 44. Kd3 Sa6 45. Tb8 Kb2 46. Tf8 Ka1 47. Kc3 Lg1
play all play one stop play next play all
Henrik Juel: So Michel's proof game is not cooked; yet... (2019-09-10)
Reto: This is now the length record for a fully tested SPG. (2023-09-17)
Moldenhauer: Keine Lösung: BP 46.5. (2024-01-05)
more ...
comment
Keywords: Unique Proof Game, Move Length Record, Non-standard material (ss), Promotion (ssT)
Genre: Retro
Computer test: Stelvio 1.64 in around 20min (highly parallelized).
FEN: n4Rn1/r1pppp1n/np3p2/8/1r1R1P2/PPK5/b1PPPP2/kB4b1
Reprints: diagrammes 69 01-02/1985
989 FIDE Album 1980-1982 1988
81 Shortest Proof Games 11/1991
Input: Gerd Wilts, 1995-06-03
Last update: A.Buchanan, 2023-09-17 more...
20 - P0003969
Roger Diot
André Hazebrouck
RA163 diagrammes 73 09-10/1985
P0003969
(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...
21 - P0005547
Erich Bartel
Josef Haas
988 feenschach 16 08/1973
P0005547
(13+6) cooked
-1w -1s, dann h=1
b) wBd2 nach e4
a) R: 1. e7-e8=L Da8xSh1, dann Da8-f8 e7xf8=L=
b) R: 1. e7-e8=L g2xSh1=D, dann g2xh1=T e7-e8=S=
play all play one stop play next play all
Cook: R: 1. Kd2-e2 Df3xSh1, dann 1. Df3-f6 Bg5xf6=
A.Buchanan: In both candidate solutions, counting of wPs after retraction on means it must be an original unit uncaptured on h1 so can only be wS.
The solution for b) does not work for a) because, if one retracts two promoting moves, then wPs have captured 9/10 missing Black units, while Black has 1/2 accounted for by wBc1. However wPg & bPg passed one another, which requires two more captures by a single player.
In b) the exciting retraction Qa8xh8 is blocked, however now the free pawn captures to explain g-file are shifted from 1+1 to 2+0, so bPg can pass wPg. But the vacation of d2 allows a new cook. This is fixable by shifting wPb instead of wPd. We don't need to shift it to an adjacent file: the solution is still ok if the balance is 2+1.
So "b) wPb2 to b7" fixes the cook, and it's validated by deadpos. (2024-01-15)
comment
Keywords: Help retractor, Allumwandlung (Ld:tS), Non-standard material (L)
Genre: Retro, Fairies
Computer test: HC+ for a) & fix for b), HC- for original a) Deadpos v2.3 14-Jan-2024
FEN: 4B2k/3p1B2/3P2P1/6P1/6P1/6P1/1P1PKp1p/1R1R1Qbq
Reprints: 216 Hobelspäne (2) 26/08/2017
Input: Gerd Wilts, 1995-06-03
Last update: A.Buchanan, 2024-01-18 more...
22 - P0005906
Unto Heinonen
R202v The Problemist 05/1992
2. Preis
P0005906
(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 play one stop play next 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...
23 - P0005911
Unto Heinonen
2375 U.S. Problem Bulletin 01-02/1992
P0005911
(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 play one stop play next 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...
24 - P0007039
Andrey Frolkin
3406 U.S. Problem Bulletin 102/103 07-10/1995
P0007039
(12+16) C+
BP in 27,0
1. Sf3 a5 2. Sd4 a4 3. Sb3 axb3 4. a3 Ta4 5. Ta2 bxa2 6. Tg1 axb1=S 7. Th1 Sc3 8. Tg1 Se4 9. c3 Sg3 10. Dc2 Sh1 11. Dg6 hxg6 12. Kd1 Th5 13. Kc2 Sh6 14. Kd3 Td5+ 15. Ke3 e5 16. Kf3 Dh4 17. Ke3 Lc5+ 18. Kf3 La7 19. h3 b6 20. Ke3 La6 21. Kf3 Ld3 22. Ke3 Lf5 23. Kf3 e4+ 24. Ke3 Sg4+ 25. Kf4 Dh8 26. Kg5 f6+ 27. Kf4 g5+
play all play one stop play next play all
Moldenhauer: Computerprüfung: C+ Stelvio 1.11 5 Sekunden.
Keine Lösung: BP 26.0, BP 26.5. (2023-03-30)
comment
Keywords: Unique Proof Game, Promenade, Non-standard material, Pendulum (K x9), Promotion
Genre: Retro
Computer test: Stelvio 1.11
FEN: 1n2k2q/b1pp2p1/1p3p2/3r1bp1/r3pKn1/P1P4P/1P1PPPP1/2B2BRn
Input: Gerd Wilts, 1996-08-12
Last update: James Malcom, 2023-05-02 more...
25 - P0008537
Michel Caillaud
615v Europe Echecs 452 01/1997
P0008537
(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 play one stop play next 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...
26 - P0008800
Andrey Frolkin
9650 Die Schwalbe 165 06/1997
1.-2. Preis ex aequo
P0008800
(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 play one stop play next 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...
27 - P0008879
Arpad Molnar
R259 The Problemist 01/1997
P0008879
(10+9) cooked
Welches waren die letzten 16 Einzelzüge?

play all play one stop play next play all
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...
28 - P0009046
Peter Wong
9923 Die Schwalbe 169 02/1998
4. Preis
P0009046
(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 play one stop play next 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...
29 - P0569740
Karl Fabel
1192 Schachmatt 01/08/1948
P0569740
(11+10) C+
h#48 (nicht exakt!)
1. g4 Lxg4 2. Lg5 Lf3 3. Lh6 ... 4. Lf8 ... 5. Ld6 ... 6. Lc7 ... 7. La5 ... 8. Lb4 ... 9. La3 ... 10. Lc1 ... 11. Ld2 ... 12. Le1 ... 13. Lf2 ... 14. Lxg1 ... 15. Kg5 ... 16. Kh6 ... 17. Kg7 ... 18. Kf8 ... 19. Ke7 ... 20. Kd6 ... 21. Kc7 ... 22. Kb6 ... 23. Ka5 ... 24. Kb4 ... 25. Ka3 ... 26. Kb2 ... 27. Kc1 ... 28. Kd2 ... 29. Ke1 ... 30. Kxf1 ... 31. Ke1 Kxg1 32. Kd1 Kf1 33. Kc1 Ke1 34. Kb2 Kd1 35. Ka3 Kc1 36. Ka4 Kb1 37. Ka5 Ka2 38. Kb6 Ka3 39. Kc6 Ka4 40. Kd6 Kb5 41. Ke7 Kc6 42. Kf8 Kd6 43. Kg7 Ke6 44. Kh8 Kxf6 45. Kg8 Kg6 46. Kh8 f6 47. Kg8 f7+ 48. Kh8 f8=D,T#
play all play one stop play next play all
James Malcom: I don’t believe that the great Fabel, with his keen eye, would have not seen such a simply cook as the taking of Black’s c5 pawn. I suspect that a Black bishop was on d4 but was forgotten placing the problem in the database, or it was a misprint. I am changing this problem to not cooked for now. However, someone should check the original source in the event I am wrong, which is always a possibility. (2020-03-15)
Mario Richter: Hi, James, there's indeed a black bishop on d4. Original stipluation: "h#48 (nicht exakt!)"
A scan for some issues of 'Schachmatt' is available in the archive at stere.ro, see
www.stere.ro/wp-content/uploads/2014/06/stere_sah_istoria_sahului-1947-1949-Schachmatt1.pdf (2020-03-26)
Joost de Heer: Stupid question, but won't moving Bh3 to g4 add another halfmove? (2023-01-30)
Henrik Juel: Yes, Joost, but this would make the solution even less exact
0... Lf3,Lh3,Lh5 1.g4 Lxg4 etc. (2023-01-30)
Joost de Heer: @Henrik: So? This is an attempt at a non-unique (exact is something else) h# length record, the level of non-uniqueness is irrelevant. And as James pointed out, adding Kg4-f4 will add yet another move.
Only possible cooks are when white starts with 1... Bh5 2. g4 Be8 (so not capturing Pg4) but I don't see how that could lead to a quicker mate. (2023-01-31)
James Malcom: I double-checked that myself, Joost, and found that going around for wPg2 actually takes far longer, which would be required any PxB action to take place, but that takes far longer than the normal solution. I know Olaf's Gustav would check, since it C+ the h#111. (2023-01-31)
more ...
comment
Keywords: Non-standard material, Promotion in the mating move
Genre: h#
Computer test: Gustav 4.2 b: Es gibt kein kürzeres Matt
FEN: 8/8/5p2/2p1pPp1/2PbPk1b/2pBp1pB/2P1P1P1/5BRK
Input: hpr, 1999-03-31
Last update: Olaf Jenkner, 2023-01-31 more...
30 - P1000172
Andrey Frolkin
Andrej N. Kornilow
9 Die Schwalbe 169, p. 342, 02/1998
3. Preis
P1000172
(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
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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...
31 - P1000246
Andrej N. Kornilow
Alexander Kislyak
10666 Die Schwalbe 181 02/2000
P1000246
(15+15) C+
BP in 30,5
1. h4 a5 2. h5 a4 3. h6 a3 4. hxg7 axb2 5. Th6 Ta3 6. Tc6 Tf3 7. a4 h5 8. a5 h4 9. a6 h3 10. a7 h2 11. a8=D h1=D 12. Da5 Dh4 13. De5 Dd4 14. Ta5 Th4 15. Sa3 Sh6 16. g8=D b1=D 17. Dgg3 Dbb6 18. Dh2 Da7 19. g4 b5 20. g5 b4 21. g6 b3 22. g7 b2 23. g8=D b1=D 24. Dgg2 Dbb7 25. Lb2 Lg7 26. Da1 Kf8 27. Kd1 Kg8 28. Kc1 Kh7 29. Kb1 Dh8 30. Ka2 Lf8 31. Lc1
play all play one stop play next play all
Reto: This is a case where strategy analysis in Stelvio is in a certain sense optimal: Only 1 strategy remains after analysis, namely the one that belongs to the solution. (2023-04-25)
more ...
comment
Keywords: Unique Proof Game, Symmetrical position, Non-standard material (DDdd), Phoenix, Prenix, Ceriani-Frolkin Theme, Asymmetrical solution, Promotion (DDDddd)
Genre: Retro
Computer test: Computerprüfung: C+ Stelvio 1.11 1 Sekunde. Keine Lösung: BP 29.5, BP 30.0.
FEN: 1nb2b1q/qqpppp1k/2R4n/R3Q3/3q3r/N4r2/K1PPPPQQ/Q1B2BN1
Input: Gerd Wilts, 2000-08-01
Last update: A.Buchanan, 2023-04-26 more...
32 - P1000634
Michel Caillaud
R081 Probleemblad 03-04/2000
P1000634
(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 play one stop play next 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...
33 - P1008814
Unto Heinonen
10727 Die Schwalbe 182 04/2000
P1008814
(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 play one stop play next 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: du = Grasshopper (G), dl = 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...
34 - P1011929
Nicolas Dupont
Retros mailing list 31/12/2003
Lob
Gianni Donati 50th Jubilee Tourney
P1011929
(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 play one stop play next 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...
35 - P1012989
Hugo August
Sahovski vjesnik 1950
1. Preis
P1012989
(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 play one stop play next 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...
36 - P1013075
Richard J. Dunn
R344v The Problemist 01/2004
P1013075
(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 play one stop play next 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...
37 - P1014060
Nils Adrian Bakke
Hans Gruber
Rainer Staudte
8600v feenschach 146 03-05/2002
P1014060
(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 play one stop play next 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...
38 - P1015183
Valery Surkov
3722 Problemist Pribuzhya 25/12/1993
1. ehrende Erwähnung
Spezielle ehrende Erwähnung
P1015183
(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 play one stop play next 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...
39 - P1066789
Göran Wicklund
R259 Probleemblad 5 09-10/2004
5. Preis
P1066789
(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 play one stop play next 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...
40 - P1068020
Itamar Faybish
Problem Online 08/2005
8. Platz
Kategorie C
P1068020
(10+10) C+
BP in 15,0
1. f4 a5 2. f5 a4 3. f6 a3 4. fxe7 f6 5. exf8=S De7 6. Sxh7 Kd8 7. Sxf6 Txh2 8. Sxd7 Txh1 9. Sf8 Th3 10. gxh3 axb2 11. Lg2 bxc1=S 12. Lh1 Sxa2 13. Dc1 Sc3 14. Ta4 Sxe2 15. Da3 Sc1+
play all play one stop play next play all
Henrik Juel: Natch 3.1 found the solution, but did not conclude in some 5 hours (2018-12-22)
Moldenhauer: Computerprüfung: C+ Natch 3.3 2 Std. 55 Min. und Euclide 1.11 1 Std. 32 Min.
Keine Lösung in BP14, BP 14,5, BP 15,5. (2022-12-16)
comment
Keywords: Unique Proof Game, Promotion (Ss), Non-standard material (Ss)
Genre: Retro
Computer test: Stelvio 1.2, 22min
FEN: rnbk1Nn1/1pp1q1p1/8/8/R7/Q6P/2PP4/1Nn1K1NB
Input: Gerd Wilts, 2005-08-21
Last update: Reto, 2023-05-17 more...
41 - P1068230
Philippe Leroy
4922 Phénix 142 07-08/2005
Pascal Wassong gewidmet
P1068230
(13+16) C+
BP in 25,5
1. e3 h5 2. Lb5 Sh6 3. Lc6 dxc6 4. a4 Dd3 5. Ta3 Dh7 6. Td3 Lg4 7. Td6 f5 8. Tf6 exf6 9. e4 Lb4 10. e5 0-0 11. e6 Td8 12. e7 Td3 13. e8=L Tc3 14. d4 b5 15. d5 bxa4 16. d6 a3 17. d7 a2 18. d8=T a1=D 19. Td7 Da6 20. Tf7 Dd3 21. Ld7 a5 22. Le6 Sa6 23. La2 Td8 24. Te7+ Td5 25. Te6 Tdc5 26. Te8#
play all play one stop play next play all
Henrik Juel: Natch 3.1 did little in more than an hour
Stopped at position 1 (2018-12-22)
Moldenhauer: Computerprüfung: C+ Stevio 1.0 7:08:52 Stunden.
Keine Lösung: BP 24.5, BP 25.0. (2023-02-14)
more ...
comment
Keywords: Unique Proof Game, Non-standard material (d), Promotion (LTd), Phoenix (TL)
Genre: Retro
Computer test: Stelvio 2.0 in 12min
FEN: 4R1k1/2p3pq/n1p2p1n/p1r2p1p/1b4b1/2rq4/BPP2PPP/1NBQK1NR
Input: Gerd Wilts, 2006-01-22
Last update: Reto, 2023-12-19 more...
42 - P1070024
Thierry Le Gleuher
R312v Probleemblad 10-12/2007
P1070024
(9+15) C+
BP in 29.5
1. e3 h5 2. Dg4 hxg4 3. Sf3 gxf3 4. Le2 fxe2 5. Tf1 exf1=L 6. Sc3 Lc4 7. Sa4 Le6 8. Sb6 axb6 9. b3 Ta5 10. La3 Tg5 11. Lc5 bxc5 12. a3 b5 13. a4 Lb7 14. a5 Le4 15. a6 c6 16. a7 Sa6 17. f3 Db8 18. f4 Kd8 19. f5 Kc7 20. f6 L4f5 21. e4 Kd6 22. e5+ Kxe5 23. h3 Kf4 24. h4 Kg3 25. h5 Kh2 26. h6 Kg1 27. hxg7 Th1 28. c3 Dh2 29. c4 Dh8 30. 0-0-0+
play all play one stop play next play all
paul: Five times delayed ascension of wPawns. See P0000309, the previous record. (2010-05-10)
Vladimir Rey: Probably, cook: Natch 3.3 test, first 28 moves. (2023-01-24)
A.Buchanan: According to Reto, Stelvio indicates this is sound (2023-01-25)
Vladimir Rey: OK! Wrong cook (white king moves: Kd1,Ke1 and castling is impossible, 30. 0-0-0+!) (2023-01-25)
more ...
comment
Keywords: Unique Proof Game, Tempo Loss (BBBBB), Promotion (l), Non-standard material (l)
Genre: Retro
Computer test: Stelvio 1.4, 7min.
FEN: 5bnq/P2pppP1/n1p1bP2/1pp2br1/2P5/1P6/3P2P1/2KR2kr
Input: Gerd Wilts, 2008-09-08
Last update: Reto, 2023-06-28 more...
43 - P1080420
Thierry Le Gleuher
R284 Probleemblad 07-08/2005
P1080420
(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 play one stop play next 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...
44 - P1080525
Andrey Frolkin
Kostas Prentos
P0190 StrateGems 34 2006
1. Lob
P1080525
(14+12) C+
BP in 26,5
1. f4 h5 2. f5 h4 3. f6 h3 4. fxe7 hxg2 5. exf8=L Th3 6. Lc5 Tg3 7. Lb6 axb6 8. h4 Taa3 9. h5 Tac3 10. bxc3 Dh4 11. La3 f6 12. Lf8 d6 13. h6 Lf5 14. h7 Ld3 15. exd3 Kf7 16. Df3 Kg6 17. Se2 g1=S 18. h8=T Sh3 19. Th5 Sf4 20. Tb5 Se6 21. Tb2 Db4 22. Th8 Sh6 23. Dg2 Kh5 24. Sc1 g6 25. Lg7 c5 26. Tf8 Sf7 27. Lh8
play all play one stop play next play all
Henrik Juel: Natch 3.1 did little in half an hour
Stopped at pos. 38 (2018-12-25)
Henrik Juel: Stelvio 1.31 used 18 seconds on my PC (2023-06-13)
more ...
comment
Keywords: Anti-Pronkin (TL), Ceriani-Frolkin Theme (L), Unique Proof Game, Non-standard material, Interchange (LT), Promotion (LsT)
Genre: Retro
Computer test: KP: C+ Stelvio 1.0 (14 seconds)
FEN: 1n3R1B/1p3n2/1p1pnpp1/2p4k/1q6/2PP2r1/PRPP2Q1/RNN1KB2
Input: Gerd Wilts, 2009-01-10
Last update: A.Buchanan, 2023-03-20 more...
45 - P1080653
Thierry Le Gleuher
R312 Probleemblad 08/2006
P1080653
(9+16) C+
BP in 28,5
1. e3 h5 2. Dg4 hxg4 3. Sf3 gxf3 4. Le2 fxe2 5. Tf1 exf1=L 6. Sc3 Lc4 7. Sa4 Le6 8. Sb6 axb6 9. b3 Ta5 10. La3 Tg5 11. Lc5 bxc5 12. a3 b5 13. a4 Lb7 14. a5 Le4 15. a6 c6 16. a7 Sa6 17. f3 Db8 18. f4 Kd8 19. f5 Kc7 20. f6 L4f5 21. e4 Kd6 22. e5+ Kxe5 23. h3 Kf4 24. h4 Kg3 25. h5 Kh2 26. h6 Kh1 27. h7 Sh6 28. b4 Tg8 29. 0-0-0+
play all play one stop play next play all
Henrik Juel: Natch 3.1 did not find the solution in 4 hours
Although the last move is obvious, testing the first 28.0 moves does help much, because after a couple of hours thousands of solutions appear with [Ta1,Ke1] having moved
The problems shows five hesitating white pawns (a2-a3-a4 instead of a2-a4, etc.)
The author claimed that this was a record in 2006 (2018-12-25)
Moldenhauer: Computerprüfung: C+ Stelvio 1.11 00:01:10 Minute. (hh:mm:ss)
Keine Lösung: BP 27.5, BP 28.0. (2023-04-08)
more ...
comment
Keywords: Unique Proof Game, Promotion (l), Non-standard material (l)
Genre: Retro
Computer test: Stelvio 1.11
FEN: 1q3br1/P2ppppP/n1p1bP1n/1pp2br1/1P6/8/2PP2P1/2KR3k
Input: Gerd Wilts, 2009-01-19
Last update: Silvio Baier, 2023-08-15 more...
46 - P1094551
Frantisek Josef Prokop
v Nas rozhlas 19/04/1940
Spezialpreis
P1094551
(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 play one stop play next 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...
47 - P1097628
Eduard Schildberg
S52 Deutsche Schachzeitung 07/1923
Pauly-Selbstmatt-Turnier
5. ehrende Erwähnung
P1097628
(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 play one stop play next 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...
48 - P1240697
Dmitri Baibikow
C22 Length Records in Last Single Moves? 11/2009
P1240697
(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 play one stop play next 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)
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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...
49 - P1246053
Nicolas Dupont
FIDE Olympic Tourney 40 Istanbul 2012
ehrende Erwähnung
P1246053
(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 play one stop play next 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...
50 - P1248304
Filip S. Bondarenko
feenschach 1960
P1248304
(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 play one stop play next 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 - P1254216
Unto Heinonen
M13) Problemkiste (175) 02/2008
P1254216
(4+8) C+
ser-s+++++++15
Madrasi
1. Kg6 2. Kf7 3. Ke6 4. Ke5 5. Kd4 6. De8 7. b4 8. b5 9. b6 10. b7 11. b8=T 12. Tb7 13. Th7 14. Th3 15. Tg3 Sxf3+++++++
play all play one stop play next play all
Arnold Beine: Am Ende ist es ein Matt durch Siebenfachschach. (2022-10-26)
more ...
comment
Keywords: Seriesmover, Madrasi, Move Length Record, Non-standard material (5xd), under-promotion (T), Promotion (T)
Genre: Fairies
Computer test: C+, Jacobi v0.7.5
FEN: 8/8/5q2/3q3K/Q5q1/1Pq2Q2/5q1n/3q1k2
Input: Erich Bartel, 2012-11-24
Last update: A.Buchanan, 2022-10-30 more...
52 - P1254246
Unto Heinonen
K2899) Problemkiste (175) 02/2008
P1254246
(4+9) C+
ser-s+++++++18
Madrasi
1. b4 2. b5 3. b6 4. b7 5. b8=T 6. Te8 7. Te7 8. Th7 9. Th5 10. Tg5 11. Kd2 12. Kc3 13. Kd4 14. De1 15. Kc4 16. Kb5 17. Kc6 18. Kd6 Sxf5+++++++
play all play one stop play next play all
Arnold Beine: Am Ende ist es ein Matt durch Siebenfachschach. (2022-10-26)
more ...
comment
Keywords: Seriesmover, Move Length Record, Madrasi, Non-standard material (5xd), Excelsior, under-promotion (T), Promotion (T)
Genre: Fairies
Computer test: C+, Jacobi v0.7.5
FEN: 5q2/3q4/6q1/2q2Q2/5q1n/3q1k2/1P4r1/4K1Q1
Input: Erich Bartel, 2012-11-25
Last update: A.Buchanan, 2022-10-30 more...
53 - P1285805
Nicolas Dupont
Roberto Osorio 55 Jubilee Tourney (RO55JT) 31/12/2012
8. Lob
P1285805
(14+13) C+
BP in 36,5
1. h4 a5 2. h5 a4 3. h6 a3 4. hxg7 axb2 5. a4 b5 6. Sa3 b1=T 7. a5 Tb4 8. a6 Ta4 9. a7 b4 10. axb8=T b3 11. Tb4 b2 12. Tbh4 b1=T 13. g4 Tbb4 14. Lb2 e5 15. Db1 e4 16. Da2 e3 17. 0-0-0 exf2 18. e4 T8a6 19. Lc4 f1=T 20. e5 Tf5 21. e6 Tfa5 22. e7 f5 23. exf8=T+ Ke7 24. Tf6 f4 25. Tfh6 Sf6 26. g8=T f3 27. Tg5 f2 28. Tgh5 f1=T 29. g5 Tff5 30. g6 Tfb5 31. g7 d5 32. g8=T Le6 33. Tg2 Dg8 34. Tgh2 Dg2 35. d4 Thb8 36. Td3 T8b6 37. Tdh3
play all play one stop play next play all
Moldenhauer: Computerprüfung: C+ Stelvio 1.11 03:08:27 Stunden. (hh:mm:ss)
Keine Lösung: BP 35.5, BP 36.0. Stelvio 1.17 ist hier viel schneller. (2023-05-01)
more ...
comment
Keywords: Unique Proof Game, Touching Non-Contemporary Siblings, Non-standard material, Promotion (tTttTTtT), Castling
Genre: Retro
Computer test: Stelvio 1.17, 6:30min. Much faster than expected...
FEN: 8/2p1k2p/rr2bn1R/rr1p3R/rrBP3R/N6R/QBP3qR/2K3NR
Input: A.Buchanan, 2014-06-28
Last update: Reto, 2023-04-18 more...
54 - P1312965
Andrey Frolkin
Kislyak Theme: New Developments , p. 6, 2/12/2015
P1312965
(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...
55 - P1340218
Nicolas Dupont
R433 The Problemist 509, p. 23, 3/2011
1st Prize
The Problemist 2011-2012
P1340218
(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 play one stop play next 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...
56 - P1360129
Joaquim Crusats
8252 Phénix 287, p. 11266, 07-08/2018
P1360129
(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
P1360655
(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 play one stop play next 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 - P1362217
Arno Tüngler
F590 Problem Paradise 62, p. 16, 04-07/2013
P1362217
(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 play one stop play next 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...
59 - P1371439
Thierry Le Gleuher
R546 The Problemist 27-6, p. 229, 11/2019
P1371439
(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 play one stop play next 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...
60 - P1380050
Eric Angelini
Retros mailing list 18/9/2020
P1380050
(12+10) C+
BP in 20.5
1. a4 d5 2. a5 d4 3. a6 d3 4. axb7 dxc2 5. bxc8=S cxd1=S 6. Sb6 Sf6 7. Sa4 Se4 8. h4 f5 9. h5 f4 10. h6 f3 11. hxg7 fxg2 12. Sf3 g1=S 13. g8=S Sxe2 14. Sxe7 Sa6 15. Sd5 Sb4 16. Ta3 Sa2 17. Txh7 Df6 18. Txc7 Th3 19. Tc2 Lb4 20. Sd4 Tc8 21. Sb5
oder auch (Non-Unique Proof Game)
1. Sf3 Sa6 2. Sd4 Sb4 3. Sb5 Sf6 4. a4 Se4 5. Ta3 Sa2 6. a5 d5 7. a6 d4 8. axb7 d3 9. bxc8=S dxc2 10. Sb6 Tc8 11. Sa4 cxd1=S 12. h4 f5 13. h5 f4 14. h6 f3 15. hxg7 fxg2 16. g8=S g1=S 17. Sxe7 Sxe2 18. Sd5 Lb4 19. Txh7 Df6 20. Txc7 Th3 21. Tc2
play all play one stop play next play all
The fastest way to control a square 16 times

Superseded by P1381619
James Malcom: Eric pondered this question yesterday on the list and on Stack Exchange. After a bit, I came back with one in 25.5 moves, my best effort, and Eric beat it today with this. A fun challenge to compose. This game is surely optimal! (2020-09-18)
Henrik Juel: This game may well be a shortest game to reach the aim
Three men never moved to control c3, but it might be possible to find a game in 20.0 moves leading to a position, where c6 or f6 are controlled 16 times (2020-09-18)
James Malcom: I severely doubt that it can be done on c6 is 20.0, as there is no tempo to switch the parity with. But I'll look into such a game on f6. (2020-09-18)
Moldenhauer: Computerprüfung: C- oder Cooked Stelvio 1.5 in 1 Sekunde.
Keine Lösung: BP 20.0. Figurenstellung sieht einem "a" ähnlich. Angelini?
Notation: 1.Sf3 Sa6 2.Sd4 Sb4 3.Sb5 Sf6 4.a4 Se4 5.Ta3 Sa2 6.a5 d5 7.a6 d4
8.axb7 d3 9.bxc8=S dxc2 10.Sb6 Tc8 11.Sa4 cxd1=S 12.h4 f5 13.h5 f4 14.h6 f3
15.hxg7 fxg2 16.g8=S g1=S 17.Sxe7 Sxe2 18.Sd5 Lb4 19.Txh7 Df6 20.Txc7 Th3 21.Tc2 (2023-08-31)
comment
Keywords: Non-Unique Proof Game, Non-standard material (SSss), Promotion (SssS)
Genre: Retro
Computer test: Moldenhauer: Stelvio 1.5 Keine Lösung: BP 20.0
FEN: 2r1k3/p7/5q2/1N1N4/Nb2n3/R6r/nPRPnP2/1NBnKB2
Input: James Malcom, 2020-09-18
Last update: Olaf Jenkner, 2023-09-03 more...
61 - P1381619
Michel Caillaud
Retros mailing list 18/9/2020
P1381619
(12+13) C+
BP in 19.5
1. f4 h5 2. f5 h4 3. f6 h3 4. fxe7 hxg2 5. exf8=S Th6 6. Sh7 a5 7. Sc3 a4 8. e4 a3 9. e5 axb2 10. e6 b1=S 11. e7 Sxd2 12. Sh3 Se4 13. Sf2 f6 14. Sg4 Kf7 15. Dxd7 Ta6 16. Dd4 Sd7 17. e8=S gxf1=S 18. Sd5 Sfg3 19. Lg5 Sh5 20. Tf1
play all play one stop play next play all
The fastest way to control a square 16 times

Superseding of P1380050
Olaf Jenkner: Der Vorläufer wurde gekocht. Kann diese Aufgabe geprüft werden? (2023-08-31)
Moldenhauer: Computerprüfung: C- oder Cooked Stelvio 1.5 in 1 Sekunde.
Keine Lösung: BP 19.0.
Stelvio-Notation: 1.Sc3 a5 2.Sf3 Ta6 3.Se5 a4 4.Sg4 a3 5.e4 axb2 6.e5 b1=S 7.e6 Sxd2
8.f4 Se4 9.f5 h5 10.Lg5 Th6 11.f6 h4 12.fxe7 f6 13.exf8=S h3 14.e7 Kf7 15.Dxd7 hxg2
16.Dd4 Sd7 17.Sd5 gxf1=S 18.e8=S Sfg3 19.Tf1 Sh5 20.Sh7.
Bitte Olaf! (2023-09-01)
A.Buchanan: This problem and its antecedant are NOT cooked. They are non-unique proof games, and there is no intention of uniqueness. Whilst it's useful to identify a shortest solution, it is disrespectful and confusing to wave around the terms "C-" & "cooked". When we have verified that this problem has no solution in 18.0 or 18.5 moves, we can mark it as C+. (2023-09-02)
Olaf Jenkner: That's quiet confusing. See P0000404 with stipulation "BP in 45,0". The keyword is "Unique Proof Game".
This problem has the stipulation "BP in 19.5". The keyword is "Non-Unique Proof Game".
I don't believe that the dot makes the difference. (2023-09-03)
Henrik Juel: One way of limiting the confusion is to change the stipulation to
Length of shortest proof game?
C+ then means that this length is indeed 19.5 moves (2023-09-03)
A.Buchanan: A root problem is that animation engine reads the stipulation to decide what to do. (AND the details are undocumented.) So if we change the stipulation to something correct, we will lose the animation. Also, there is no Originalforderung field to keep track of the composer's intent. The comma dot is another linguistic challenge which could be addressed if we had multi-language support for stips like we do for source, composer, keyword & fairy piece. Obviously I'm very grateful for Gerd's work, but he has given no indication when, if ever, he will restart serious development work on PDB, so in the meantime we need to muddle through. In the meantime, the best we could do is rework the stipulation to add "(non-unique)" or "how many solutions?" etc. This edit can be done by screen-scraping in an automated way, if we can agree the principle (2023-09-03)
more ...
comment
Keywords: Non-Unique Proof Game, Non-standard material (SSss), Promotion (SSss), Move Length Record
Genre: Retro
Computer test: Moldenhauer: Stelvio 1.5 Keine Lösung: BP 19.0
FEN: 2bqN1n1/1ppn1kpN/r4p1r/3N2Bn/3Qn1N1/8/P1P4P/R3KR2
Input: James Malcom, 2020-11-07
Last update: Olaf Jenkner, 2023-09-03 more...
62 - P1404288
Viktor Sizonenko
4 Mystetski shakhy , p. 14, 2001
P1404288
(4+1)
#8
1. Kg6 Kd4 2. Kf5 Kc5 3. Ke5 Kb6 4. Kd6 Ka7 5. La5 Kb8 6. Lc7+ Ka7 7. Kc6 Ka8 8. Kb6#
1. ... Kd6 2. Kf6 Kc5 3. Ke5 usw.
play all play one stop play next play all
Henrik Juel: many duals (2022-09-12)
comment
Keywords: Non-standard material, Aristocrat, Rex solus (s)
Genre: n#
FEN: 8/7K/8/2kB4/2B5/8/8/4B3
Input: Rainer Staudte, 2022-09-12
Last update: Gunter Jordan, 2022-09-12 more...
63 - P1406369
Mirko Degenkolbe
10274 Seven Chess Notes 203, p. 20, 12/2022
Spezielle ehrende Erwähnung
P1406369
(5+2) C+
s#7
b)-Tb5
a) 1. Tb6+! Txb6+ 2. Dh5-h6 Ke5 3. Dc8-c3+ Ke4 4. Dh6-h7+ Tg6 5. Df7-f1 Kd5 6. Df1-d3+ Ke6 7. Dh7-g8+ Txg8#
b) 1. Dh5-g6+! Ke5 2. Df7-f6+ Kd5 3. Df6-d8+ Ke5 4. Dg6-g3+ Ke4 5. Dc8-c6+ Kf5 6. Dc6-f3+ Ke6 7. Dd8-c8# Txc8#
play all play one stop play next play all
(MD1842)
more ...
comment
Keywords: Model mate, Aristocrat, Miniature, Echomatt, Non-standard material, Minimal
Computer test: Gustav 4.1d
FEN: 1rQ1K3/5Q2/3k4/1R5Q/8/8/8/8
Input: Felber, Volker, 2022-12-02
Last update: Felber, Volker, 2023-02-19 more...
64 - P1406684
Udo Degener
Mirko Degenkolbe
12705 feenschach 250 10-12/2022
P1406684
(5+14)
h#3
0.1.1...
Nullstellung
a) sKg3->d3
b) sSd2->e5
c) sSd2->e1
a) 1. ... Sg5-f3 2. Kxe4 Sxd2+ 3. Ke5 Sh2-f3#
b) 1. ... Sh2-f3 2. Kg4 Sxe5+ 3. Kxg5 Sh4-f3#
c) 1. ... Sh4-f3 2. Kg2 Sxe1+ 3. Kg1 Sg5-f3#
play all play one stop play next play all
Meeraner, Urform, zyklisch, 3-fach, Themafiguren: wS & wS & wS

Meerane-Thema, Siebente Form (Sauberer Meerane-Zyklus mit drei Elementen) wahrscheinlich eine Erstdarstellung mit diesen Themasteinen: In einem Hilfsmatt mit (mindestens) drei Lösungen führt Weiß den Schlüssel aus. Der Mattzug von Lösung I. wird zum Schlüsselzug von Lösung II. Der Mattzug aus Lösung II. wird zum Schlüssel in Lösung III. Der Mattzug von Lösung III. wird zum Schlüssel von Lösung I. Zyklus AB – BC – CA der weißen Themazüge. Themafiguren: weißer Springer & weißer Springer & weißer Springer. Hier findet die Thematik auf nur einem Themafeld statt (f3).

Schlüsselzüge und Matts auf dem gleichen Feld.
(MD1848)
Henrik Juel: C+ Popeye 4.61 also (2022-12-13)
Henrik Juel: Obviously promoted material, white knight (2022-12-13)
comment
Keywords: Model mate (b+c), Meerane-Thema (7. Form), Non-standard material, x pieces move to one square
Computer test: Gustav 4.1d
FEN: 8/3bKp1q/1p5p/3r2Nn/3pPp1N/4b1k1/3n1p1N/7r
Input: Felber, Volker, 2022-12-13
Last update: Gunter Jordan, 2023-01-17 more...
65 - P1406936
Ilja S. Schumow
405 Wsemirnaja illjustrazija 19/06/1876
P1406936
(8+12)
#4
1. Se8! droht 2. Sxc7#
1. ... Tab4 2. Txg8 droht 3. Sxc7#
2. ... Taxa6 3. Sd6+ Tb8 4. Tgxb8#,Tbxb8#
1. ... Tcb4 2. Txg8 droht 3. Sxc7#
2. ... Taxa6 3. Sd6+ Tb8 4. Tgxb8#,Tbxb8#
1. ... Tab5 2. Txg8 droht 3. Sxc7#
2. ... Taxa6 3. Sd6+ Tb8 4. Tgxb8#,Tbxb8#
1. ... Tcb5 2. Txg8 droht 3. Sxc7#
2. ... Taxa6 3. Sd6+ Tb8 4. Tgxb8#,Tbxb8#
play all play one stop play next play all
Henrik Juel: C+ Popeye 4.61, except for the mate duals (2022-12-30)
comment
Keywords: Non-standard material
Genre: n#
FEN: k5b1/p1p1p1N1/P1r1r3/r1r1r3/r1r5/5B1P/5P1K/1R4R1
Input: Rainer Staudte, 2022-12-30
Last update: Gunter Jordan, 2022-12-30 more...
66 - P1408367
Udo Degener
Mirko Degenkolbe
1775 Augsburger Allgemeine 04/03/2023
P1408367
(11+12)
#2
zwei weiße Damen
1. Sd5! droht 2. Sb6#, 2. Se7#
1. ... Daxd5 2. Da8#
1. ... Sbxd5 2. Dxb7#
1. ... cxd5 2. Dxd7#
1. ... Tdxd5 2. Dh8#
1. ... exd5 2. Lxd7#
1. ... Sfxd5 2. Tf8#
1. ... Lgxd5 2. Tg8#
1. ... Thxd5 2. h8=D,T#
play all play one stop play next play all
Lösung:
1.Sd5! (droht 2.Sb6 & 2.Se7#)
1. ...D axd5 2.Da8#
1. ...S bxd5 2.Dxb7#
1. ... cxd5 2.Dxd7#
1. ...T dxd5 2.Dh8#
1. ... exd5 2.Lxd7#
1. ...S fxd5 2.Tf8#
1. ...L gxd5 2.Tg8#
1. ...T hxd5 2.h8D,T#

Nach Ausführung des Schlüsselzuges wird der weiße Springer von acht verschiedenen schwarzen Figuren geschlagen. Jede Figur führt ihre Parade von einer anderen Linie aus. Somit ist hier das Maximum erreicht.
Klassischer Zweizüger. Task.
(MD1886)
Henrik Juel: C+ Popeye 4.61, except for double threat (2023-03-19)
comment
Keywords: Obvious promotion (Lg2), Non-standard material
Genre: 2#
Computer test: Gustav 4.1d
FEN: 2k5/1pPp3P/2pPpN2/2N4r/Qn1r1n1p/7B/qQ4bK/5RR1
Input: Felber, Volker, 2023-03-19
Last update: Felber, Volker, 2023-03-19 more...
67 - P1409087
Valery Surkov
F4 7ShahMat 03/09/2021
P1409087
(5+2)
s#3
3.1...
1. Da5! Dxe8 2. Dd7+ Dxd7 3. Lb7+ Dxb7#

1. Df6! Dxe8 2. Ld7+ Dxd7 3. Db7+ Dxb7#

1. Ddd4! Dxe8 2. Lb7+ Kc7+ 3. Db8+ Dxb8#
play all play one stop play next play all
SCHRECKE: C+, popeye 4.87 (2023-04-28)
comment
Keywords: Change of Sacrifices (DL-LD-D), Non-standard material, Aristocrat, Minimal (d), Miniature, Corner mate
Genre: s#
FEN: K1kqR3/Q7/2BQ4/8/8/8/8/8
Input: Rainer Staudte, 2023-04-28
Last update: Gunter Jordan, 2023-04-28 more...
68 - P1409792
Hilmar Ebert
1398 Landeszeitung für die Lüneburger Heide 15/10/1994
Godehard Murkisch gewidmet
zum 20 000. Lebenstag
(am 31. Oktober 1994)
P1409792
(4+2) C+
#8
3 wS
1. Sc6! Kh2 2. Se5 Kh3 3. Sd3 Kh2 4. Sf2 Kg1 5. Sfg4 Kh1 6. Sh4 Kg1 7. Sf3+ Kh1 8. Sf2#
play all play one stop play next play all
Das bislang zuglängste Drei-Springer-Mattproblem, in dessen Lösung der wK nicht eingreift.

H. Ebert: "Der große Wagen" als Sternbild der ersten fünf Springerzüge.
more ...
comment
Keywords: Minimal, Miniature, Non-standard material
Genre: n#
Computer test: Juel: Popeye 4.61
FEN: 8/8/8/N2p1N2/3K4/4N2k/8/8
Reprints: 35 Problemschach-Jahrbuch D 1994, p. 22, 1994
Input: Dieter Berlin, 2023-05-18
Last update: Dieter Berlin, 2023-05-18 more...
69 - P1409983
Andrey Frolkin
Werner Keym
1.67 Eigenartige Schachprobleme , p. 196, 2010
P1409983
(10+2)
Letzter Zug?
R: 1. g3xBh4 h5-h4 and e.g. 2. Kf4-g5 Kh4-h3
play all play one stop play next play all
Compare P0000999 with more non-standard material
more ...
comment
Keywords: Economy record (Last Move? Type A), Last Move? (BxB), Non-standard material (L), Type A, Type B (a fortiori), Economy record (Last Move? Type B), Minimal
Genre: Retro
FEN: 8/1p5P/6PP/5BK1/6PP/5B1k/6NP/8
Input: A.Buchanan, 2023-05-28
Last update: A.Buchanan, 2023-05-31 more...
70 - P1410458
Josef Moravec
Narodni Listy 16/11/1913
P1410458
(5+2)
#2
1. 0-0 Kc2 2. Dg2#
1. ... Ka2 2. Dh2#
1. ... Sxe3 2. Dc1#
play all play one stop play next play all
Henrik Juel: 1.0-0 zz
1... Kc2/Ka2/Sxe3 2.Dg2/Dh2/Dc1#
all the other variations are dualstic (2023-06-21)
comment
Keywords: Castling key, Castling (wk), Non-standard material, Aristocrat, Minimal (s), Miniature, pin-mate (D-S, D-S)
Genre: 2#
FEN: 6Q1/2Q5/8/8/2n5/4R3/1k6/4K2R
Reprints: 73 Böhmische Schachminiaturen 1922
Input: Rainer Staudte, 2023-06-21
Last update: Gunter Jordan, 2023-06-22 more...
71 - P1410459
Josef Moravec
347 Narodni Listy 1913
P1410459
(5+2)
#2
1. 0-0 Kc2 2. Dg2#
1. ... Ka2 2. Dh2#
1. ... Se3 2. Dc1#
play all play one stop play next play all
Henrik Juel: 1.0-0 zz
1... Kc2/Ka2/Se3 2.Dg2/Dh2/Dc1#
duals in all other variations (2023-06-21)
comment
Keywords: Castling key, Castling (wk), Non-standard material, Aristocrat, Minimal (s), Miniature, pin-mate (D-S, D-S)
Genre: 2#
FEN: 6Q1/2Q5/8/8/2n5/7R/1k6/4K2R
Input: Rainer Staudte, 2023-06-21
Last update: Gunter Jordan, 2023-06-22 more...
72 - P1411042
Marko Ylijoki
feenschach 2022
P1411042
(3+15) C+
h#5
0.4.1...
1) 1. ... g8=S 2. Lf5 Sh6 3. Kd5 Sg8 4. Td4 Kb5 5. Le6 Sf6#
2) 1. ... g8=D+ 2. Kc3+ Dc4+ 3. Kb2 Dxd3 4. Ka1 Dxd6 5. Tb1 Dxa3#
3) 1. ... g8=T 2. Lc2 Tb8 3. Kb3 Txb6 4. Ka4 Tb5 5. Lb3 Txa5#
4) 1. ... g8=L+ 2. Kd4+ Lc4 3. Ke4 Lb5 4. Sc4 Lxd7 5. Ld4 Lc6#
play all play one stop play next play all
Yuri Bilokin: you can see 1.Bg6 g8=Q+ 2.Kc5 Qb3 3.Rd4 Qb5#
1.Bh7 g8=Q+ 2.Kc5 Qb3 3.Rd4 Qb5#
1.Bd4 Kxa5 2.Bf8 gxf8=Q 3.d5 Qxb4#
1.Bf8 gxf8=Q 2.Bd4 Kxa5 3.d5 Qxb4# (2023-07-29)
comment
Keywords: Non-standard material
Genre: h#
Computer test: Gustav 4.1d
FEN: r7/p2p2P1/Kb1b4/n3p1p1/1rk2pP1/p2bp3/8/3n4
Input: Felber, Volker, 2023-07-21
Last update: Felber, Volker, 2023-07-21 more...
73 - P1411659
Gyula Bebesi
v Problemas 1962
P1411659
(8+14) cooked
h#2
1. exd3ep Lg8+ 2. d5 cxd6ep#
1. axb3ep bxc6+ 2. b5 cxb6ep#
play all play one stop play next play all
PRA means one problem two parts
Cook: R: 1. Kf6-e5 Ld6-f8+
see P0003365
Henrik Juel: Intention:
White captured axSb and [Lc8]
If last move was b2-b4: 1.axb3ep bxc6+ 2.b5 cxb6ep#
If last move was d2-d4: 1.exd3ep Lb8+ 2.d5 cxd6ep# (2023-08-08)
Henrik Juel: Cook: last move could also be Kf6-e5
correction, e.g., move Sh3 to h5 (2023-08-08)
A.Buchanan: Good catch Henrik - I should have looked at this one more carefully! Luckily it admits an easy fix, but there is still the non-standard material. (2023-08-08)
Henrik Juel: I should have thought of a better birthday greeting, Andrew, but there you are (2023-08-08)
comment
Keywords: Partial Retro Analysis (PRA), En passant as key (2), En passant as mating move (2), Non-standard material (L), Superseded by (P1413906)
Genre: h#, Retro
Computer test: HC+ Popeye v4.87 & simple retro-logic
FEN: 3r1b2/1p1p3B/B1r3p1/1PP1Kp2/pPkPp3/p1p4n/N7/2q5
Reprints: Schach-Echo , p. 324, 08/1984
23 125 ausgewählte Schachprobleme , p. 10, 1985
2 Problemas 44, p. 1456, 10/2023
Input: A.Buchanan, 2023-08-08
Last update: A.Buchanan, 2023-12-04 more...
74 - P1411660
Andrew Buchanan
Retudin
James Malcom
puzzling.stackexchange.com 01/08/2023
P1411660
(8+5) C+
s#5
1. b4 h5 2. b5 h4 3. b6 h3 4. b7 h2 5. b8=B Lxg7#
play all play one stop play next play all
more ...
comment
Keywords: Dummy Pawn, Golden Age (Dummy Pawn), Economy record (dummy pawn excelsior), Excelsior, Non-standard material (TL)
Genre: s#
Computer test: C+ Popeye v4.87
FEN: 2R1R2b/3kp1R1/7p/2P5/8/8/BP6/KB5p
Input: A.Buchanan, 2023-08-08
Last update: A.Buchanan, 2023-12-18 more...
75 - P1413567
Allan Bell
C8350 The Problemist 03/1993
P1413567
(6+1)
#4
1. Sac3! Kc5 2. Sa8 Kd4 3. Sac7 Kc5 4. Se6#
play all play one stop play next play all
SCHRECKE: C+, Gustav 4.2e, Brute Force (2023-11-18)
comment
Keywords: Non-standard material (SSS), Miniature, Rex solus (s)
Genre: n#
FEN: 5K2/8/1N6/3NN3/N1Nk4/8/8/8
Input: Rainer Staudte, 2023-11-18
Last update: Gunter Jordan, 2023-11-18 more...
76 - P1413568
Vladimir Kozhakin
Albert S. Schachnasarjan
908 Kudesnik 63 25/07/2000
Thematurnier
Lob
P1413568
(5+2)
#4
1. Sf4! Ke4xf4 2. Dh4+ Sg4 3. Kd3 Ke5 4. Dg5#
1. ... Ke4xd4 2. Db4+ Sc4 3. Kf3 Ke5 4. Dc5#
play all play one stop play next play all
SCHRECKE: C+, Gustav 4.2e, Brute Force (2023-11-18)
comment
Keywords: Non-standard material (S), Sacrifice key (S,S), Miniature, Minimal (s), Symmetrical position (nach Schlüssel)
Genre: n#
FEN: 4N3/4Q3/8/3Nn3/3Nk3/8/4K3/8
Input: Rainer Staudte, 2023-11-18
Last update: Gunter Jordan, 2023-11-18 more...
77 - P1413569
Walentin A. Simonow
902 Kudesnik 63 25/07/2000
Thematurnier
Lob
P1413569
(5+2)
#4
1. Ke5! Kxf1 2. Sf4 Kg1 3. Th3 Kf1 4. Th1#
1. ... Kxd1 2. Sd4 Kc1 3. Tb3 Kd1 4. Tb1#
play all play one stop play next play all
SCHRECKE: C+, Gustav 4.2e, Brute Force (2023-11-18)
comment
Keywords: Non-standard material (S), Sacrifice key (S,S), Minimal (b), Miniature, Variation Asymmetry
Genre: n#
FEN: 8/8/4p3/8/4K3/4R3/4N3/3NkN2
Input: Rainer Staudte, 2023-11-18
Last update: Gunter Jordan, 2023-11-18 more...
78 - P1413570
Aleksandr Oleynik
901 Kudesnik 63 25/07/2000
Thematurnier
1. Ehrende Erwähnung
P1413570
(4+2)
#4
1. Sc5! droht 2. Sd3#
1. ... Kb2 2. Sd3+ Ka1 3. Sd4 c1=D,c1=T 4. Sb3#
3. ... c1=S 4. Sc2#
2. ... Ka3 3. Sd4 c1=D,c1=T 4. Sdb5#
play all play one stop play next play all
Henrik Juel: C+ Popeye 4.61 (except for two double mate threats) (2023-11-18)
comment
Keywords: Non-standard material (S), Minimal, Miniature
Genre: n#
FEN: 8/8/8/8/N1K5/2N2N2/2p5/2k5
Input: Rainer Staudte, 2023-11-18
Last update: Rainer Staudte, 2023-11-18 more...
79 - P1413571
Wiktor Wolkow
Vladimir Kozhakin
907 Kudesnik 63 25/07/2000
Thematurnier
2. Ehrende Erwähnung
P1413571
(5+1)
#4
1. Sbc6! Kc4 2. Sd2+ Kc3 3. Kd1 Kd3 4. Tb3#
2. ... Kc5 3. Se4+ Kc4 4. Tb4#
1. ... Kd6 2. Sg5 Kc5 3. Se4+ Kc4 4. Tb4#
play all play one stop play next play all
SCHRECKE: C+, Gustav 4.2e, Brute Force (2023-11-18)
comment
Keywords: Non-standard material (S)
Genre: n#
FEN: 1N6/1R2N3/8/2k5/8/5N2/4K3/8
Input: Rainer Staudte, 2023-11-18
Last update: Rainer Staudte, 2023-11-18 more...
80 - P1413581
Klaus-Peter Zuncke
4/45 Schach (Borowitschi) 4 12/1991
P1413581
(5+1)
#4
1. Sb3! Ka2 2. Sfd2 Ka3 3. Sc2+ Ka2 4. Sc1#
3. ... Ka4 4. Sc3#
play all play one stop play next play all
SCHRECKE: C+, Gustav 4.2e, Brute Force (2023-11-19)
comment
Keywords: Non-standard material (SS), Miniature
Genre: n#
FEN: 8/8/8/8/8/8/8/1kNNNN1K
Input: Rainer Staudte, 2023-11-19
Last update: Rainer Staudte, 2023-11-19 more...
81 - P1413582
Edgar D. Holladay
2150 U.S. Problem Bulletin 75 01/1991
P1413582
(5+1)
#4
b)verschiebe alles ein Feld nach links oben
a) 1. Se5! Kb2 2. Se4 Kb1 3. Sd3 Ka2 4. Sc3#
2. ... Ka2 3. Sd3 Kb1 4. Sc3#
2. ... Kc1 3. Sd3 Kb1 4. Sc3#
3. ... Kd1 4. Sc3#,Sf2#

b) 1. Sd6! Ka3 2. Sa1 Kb4 3. Sc2+ Ka5 4. Sc4#
2. ... Kb2 3. Sc4+ Kxa1 4. Sb3#
3. ... Kc1 4. S5b3#,Sd3#
play all play one stop play next play all
Henrik Juel: C+ Popeye 4.61, except for mate duals (2023-11-19)
comment
Keywords: Non-standard material (SS), Miniature, Aristocrat
Genre: n#
FEN: 8/8/8/8/2NN4/2k1K3/2NN4/8
Input: Rainer Staudte, 2023-11-19
Last update: Rainer Staudte, 2023-11-19 more...
82 - P1413585
Edgar D. Holladay
233a Ideal-Mate Review 6 11/1983
P1413585
(4+1)
#5
1. Sc5! Kb8 2. Ka6 Kc8 3. S7e6 Kb8 4. Sd7+ Kc8 5. Sab6#
4. ... Kxa8 5. Sc7#
play all play one stop play next play all
Henrik Juel: C+ Popeye 4.61 (2023-11-19)
comment
Keywords: Non-standard material (S)
Genre: n#
FEN: N7/k1NN4/8/1K6/8/8/8/8
Input: Rainer Staudte, 2023-11-19
Last update: Rainer Staudte, 2023-11-19 more...
83 - P1413586
Werner Speckmann
Skakbladet 1971
P1413586
(4+3)
#2
1. Dce3+! Ka8 2. Dea3#
1. ... Ka6 2. Da4#
1. ... Db6 2. Dfa3#
play all play one stop play next play all
SCHRECKE: C+, popeye 4.89 (2023-11-20)
comment
Keywords: Non-standard material (DDd)
Genre: 2#
FEN: 1q3Q2/kq6/8/8/4Q3/2Q5/K7/8
Input: Rainer Staudte, 2023-11-19
Last update: Rainer Staudte, 2023-11-19 more...
84 - P1413588
Leonid Ivanovich Kubbel
Turnier des belorussischen DSO Spartak 1933
1. Preis
P1413588
(3+4)
#2
1. Dg7! a1=D 2. Dxa1#
1. ... Ka7 2. Da5#
1. ... Th8,T~ 2. Dgxb7# 2. Ddxb7#
1. ... Td8 2. Dgxb7#
play all play one stop play next play all
Henrik Juel: duals after 1... Th8,Tg8,Tf8,Te8,Tc8 (2023-11-20)
comment
Keywords: Non-standard material, Miniature
Genre: 2#
FEN: kr6/1n6/8/3Q4/8/8/p2K4/6Q1
Input: Rainer Staudte, 2023-11-20
Last update: Rainer Staudte, 2023-11-20 more...
85 - P1414063
Andrew Buchanan
The Puzzling Side of Chess 228 31/10/2023
P1414063
(14+2)
Dead position, with check, maximizing the number of legal but unplayable moves.

20 legal but unplayable moves.
Black just played c6xd5+ or exd5+, not d6-d5? which would have ended the game in prior dead position.
Henrik Juel: The position is displayed by clicking on one of the five animation symbols and then moving the cursor (2023-12-14)
Henrik Juel: ... and then moving the cursor up (2023-12-14)
A.Buchanan: I think the phrase "legal but unplayable" is happier than "impossible", so I will use the former (2023-12-14)
A.Buchanan: Have reverted to the mode in which PDB shows the diagram directly, rather than having to click animation. (2023-12-16)
more ...
comment
Keywords: Construction record, Minimal, Dead Position, Type C, Non-standard material (TTLSSSS)
Genre: Retro, Mathematics
FEN: B5Bk/2NRN3/1N3N2/R2p2R1/2KR1N2/4N3/6Q1/8
Input: A.Buchanan, 2023-12-14
Last update: A.Buchanan, 2023-12-16 more...
86 - P1414564
Erich Bartel
Mario Richter
I Problemkiste , p. 313, 01/2007
EB correction MR
P1414564
(13+6) C+
-1w -1s, dann h=1
R: d7-d8=D g2xSh1=L, dann 1. gxh1=T dxe8=S=
play all play one stop play next play all
See P0005542.
A.Buchanan: WinChloe incorrectly reports this as M.Rittirsch. But what is the true source & date of this correction? Obviously, it wasn't F.Lapya. (2024-01-19)
Adrian Storisteanu: I'd would have put a wB (instead of the wQ) on d8 -- a subtler non-standard material?!... (2024-01-19)
Adrian Storisteanu: (... Ooops, but then no 'AUW'.) (2024-01-19)
comment
Keywords: Help retractor, Allumwandlung (Dl:tS), Non-standard material (D)
Genre: Retro, Fairies
Computer test: HC+ Deadpos v2.3 14-Jan-2024 + simple retro-logic
FEN: 3Qn2k/7P/6P1/8/8/P4P2/RPPP1p1p/RQK2Bbb
Input: A.Buchanan, 2024-01-18
Last update: A.Buchanan, 2024-01-20 more...
87 - P1414667
Hans Klimek
Deutsche Schachzeitung 01/1981
P1414667
(4+1)
#5
1. Kf6! Kf8 2. Se6+ Kg8 3. Kg6 Kh8 4. Sf7+ Kg8 5. Sf6#
2. ... Ke8 3. Sd6#
1. ... Kd8 2. Se6+ Kc8 3. Sd6+ Kb8 4. Sc6+ Ka8 5. Sc7#
2. ... Ke8 3. Sd6#
play all play one stop play next play all
Henrik Juel: C+ Popeye 4.61 (2024-01-25)
comment
Keywords: Non-standard material
Genre: n#
FEN: 4k3/6K1/8/4N3/4NN2/8/8/8
Input: Rainer Staudte, 2024-01-25
Last update: Rainer Staudte, 2024-01-25 more...
88 - P1414719
Daniele Gatti
F364 SuperProblem (Website) 14/01/2024
P1414719
(5+2) C+
s#8
1. Df5+ Ke7 2. Dc7+ Ke8 3. Da4+ Db5 4. De6+ Kf8 5. Dd8+ De8+ 6. Kh7 Dxd8 7. Df6+ Dxf6 8. Dg7+ Dxg7#
play all play one stop play next play all
more ...
comment
Keywords: Non-standard material, Checking key, Miniature, Minimal (d), Aristocrat, Cross check, Pinning, Unpinning, Sacrifice of white pieces
Genre: s#
Computer test: SCHRECKE: Gustav 4.2e
FEN: 8/8/4k1K1/8/8/6Q1/4q3/Q4QQ1
Input: Rainer Staudte, 2024-01-31
Last update: Dieter Berlin, 2024-01-31 more...
89 - P1416092
Herman Menkis
5773 Ideal-Mate Review 98 1993
P1416092
(4+2)
h#3
0.2.1.1.1.1
1. ... Kc2 2. Kd4+ Kd2 3. Tc4 Se6#
1. ... Kc3 2. Td6 Sd7+ 3. Kd5 Se7#
play all play one stop play next play all
SCHRECKE: C+, popeye 4.89 (2024-03-29)
comment
Keywords: Non-standard material (S)
Genre: h#
FEN: 8/8/2r2NN1/2k3N1/8/1K6/8/8
Input: Rainer Staudte, 2024-03-29
Last update: Rainer Staudte, 2024-03-29 more...
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