Chess Problem Database Server

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

(14+14)
BP in 57.5

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

Der absolute KBP-Längenrekord.

See P1338946 cooked.
paul: Compare with P0002278 & P0002279 (2010-04-30)
Mu-Tsun Tsai: This one is by far the toughest retro I've ever solved. Very little certain information can be determined by structural consideration alone, even with long and complicated argument. It took me five days to complete solving this. (2012-07-22)
A.Buchanan: @Mu-Tsun: that's an interesting data point - thanks for posting. (2017-09-07)
Henrik Juel: The current record is 58.5 moves in a proof game problem by the authors + Keym, Die Schwalbe 2017 (2017-09-07)
Henrik Juel: I just learned that the 58.5 move proof game has been cooked... (2017-09-07)
A.Buchanan: In retrospect, my earlier comment about "interesting data point" is a bit weak. It's actually great that for such an extreme problem, someone took substantial time to independently validate it. It's like doing science: people want to do their own new stuff, and are unwilling to take the time to validate what's already been claimed. This one has survived 30+ years, and maybe the use of constraints e.g. in Jacobi can eventually allow it to be HC+. (2021-05-29)
Olaf Jenkner: This problem is the current record, because P1338946 (58.5 moves) has been cooked. (2021-11-25)
Reto: This is C+ up to 51.0 moves with Stelvio 2.0. This ties the record for partial testing of an SPG. Took 1200 CPU hours of strategy seeking (finding 378 0+0 strategies) and another 13h of strategy playing these strategies. If this can ever be completely solved, then it needs to be the case that all strategies have 0+0 free moves, otherwise playing is utterly hopeless.
@Andrew: There is absolutely no way a brute-force based program like Jacobi ever stands a chance at solving something like this, no matter how many conditions you add. (2023-12-14)
more ...
comment

Keywords: Unique Proof Game, Move Length Record, Non-standard material (TTTTTTtttttt), Castling, Aristocrat, Superseded by (P1397486)
Genre: Retro
FEN: kQ3Br1/1b3rr1/1n1Nr2R/q1R4r/R1Rbr3/R1RRr3/NnB1rR2/5K2
Reprints: 584 Ukrainisches Album 1986-1990
86 Shortest Proof Games 11/1991
(6) diagrammes 103 10-12/1992
H18 FIDE Album 1989-1991 1997
feenschach 137, p. 368, 08-09/2000
Input: Gerd Wilts, 1995-06-03
Last update: James Malcom, 2021-12-25 more...

2 - P0001427
Karl Fabel
Am Rande des Schachbretts 1947

(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

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...

3 - P0001634
Dmitri W. Pronkin
503v Europe Echecs 358 04/1989
5. Preis

(12+11) C+
BP in 31,0

1. b3 h5 2. La3 h4 3. Dc1 h3 4. Kd1 hxg2 5. h4 e5 6. h5 e4 7. h6 e3 8. h7 exf2 9. e4 f5 10. Se2 g1=L 11. Lg2 f1=L 12. e5 Lb6 13. d4 Lfc5 14. dxc5 f4 15. cxb6 f3 16. Df4 f2 17. Sc1 La6 18. Lc5 f1=L 19. a3 Lfb5 20. c4 Se7 21. cxb5 Tg8 22. hxg8=L g5 23. Lc4 d5 24. bxa6 Lf5 25. e6 Sc8 26. e7 Kf7 27. e8=L+ Kg8 28. Leb5 c6 29. Ta2 cxb5 30. Tc2 Sc6 31. Sa2 dxc4+
play all

paul: Correction of P0001580 (2010-09-25)
Silvio Baier: Mit 30....dc+ ist das C+ (Euclide 0.98, Retractor für den letzten Zug) (2011-07-08)
James Malcom: So this is fully C+? (2021-01-27)
Henrik Juel: No, another problem in 30.0 moves ending with 30. Tc2 dxc4+ is tested OK (2021-01-27)
more ...
comment

Keywords: Ceriani-Frolkin Theme (lllLL), Unique Proof Game, Promotion (lllLL)
Genre: Retro
Computer test: Computerprüfung: C+ Stelvio 1.11 65:30:51 Stunden. (hh:mm:ss) Keine Lösung: BP 30.0, BP 30.5.
FEN: r1nq2k1/pp6/PPn5/1pB2bp1/2p2Q2/PP6/N1R3B1/1N1K3R
Reprints: 580 Ukrainisches Album 1986-1990
26 Shortest Proof Games 11/1991
H25 FIDE Album 1986-1988 1995
(H25) Die Schwalbe 156, p. 237, 12/1995
feenschach 141 06/2001
Thema Danicum 105 2002
(C) Quartz 22 10-12/2002
H2 The Problemist 07/2010
(18) Die Schwalbe 250A 08/2011
Input: Gerd Wilts, 1995-06-03
Last update: A.Buchanan, 2023-05-08 more...

4 - P0001638
Michel Caillaud
507 Europe Echecs 364 04/1989
2. ehrende Erwähnung

(13+13) C+
BP in 24,5

1. f3 c6 2. Kf2 Db6+ 3. Kg3 Dxg1 4. h4 Dxf1 5. h5 Dxh1 6. h6 Dh5 7. hxg7 Sh6 8. g8=S Lg7 9. a4 Lc3 10. a5 f6 11. a6 Kf7 12. axb7 Kg6 13. Txa7 Sf7 14. Ta1 Ta4 15. Sh6 Sa6 16. b8=T Tf8 17. Tb4 Sh8 18. Th4 Tf7 19. Th1 Th4 20. Sg4 Sb4 21. Sf2 La6 22. Sh3 Ld3 23. Sg1 Kg5 24. Kf2 Lg6 25. Ke1
play all

Schlag von wSg1 und wTh1 auf ihren Ursprungsfeldern. Anschließend werden die beiden Orginalsteine durch UW-Steine ersetzt.

paul: The last moves are: 14.Ta1 Ta4 15.Sh6 Sa6 16.b8=T Tf8 17.Tb4 Sh8 18.Th4 Tf7 19.Th1 Th4 20. Sg4 Sb4 21. Sf2 La6 22. Sh3 Ld3 23. Sg1 Kg5 24. Kf2 Lg6 25. Ke1
Phoenix-Pronkin theme: wNg1 & wRh1 are promoted, here combined with wK-switchback. (2008-03-24)
more ...
comment

Keywords: Unique Proof Game, Pronkin Theme (TS), Switchback (KT)
Genre: Retro
Computer test: Euclide 0.96 Ergänzung: Stelvio 1.2. Keine Lösung: BP 23.5, BP 24.0.
FEN: 7n/3ppr1p/2p2pb1/6kq/1n5r/2b2P2/1PPPP1P1/RNBQK1NR
Reprints: 43 Shortest Proof Games 11/1991
H16 FIDE Album 1989-1991 1997
feenschach 141 06/2001
Input: Gerd Wilts, 1995-06-03
Last update: A.Buchanan, 2023-05-21 more...

5 - P0001750
Michel Caillaud
Markus Johannes Ott
3710 feenschach 63 12/1982
K. Widlert gewidmet
2. Preis

(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

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...

6 - P0002241
Michel Caillaud
3817 feenschach 65 15/05/1983
1. ehrende Erwähnung

(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

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...

7 - P0002257
Ulrich Ring
5674 feenschach 93 11-12/1989

(13+15) cooked
BP in 23,5

1. e4 h5 2. Dg4 hxg4 3. d4 Th3 4. d5 Tb3 5. Le3 b5 6. Lb6 axb6 7. h4 Ta4 8. h5 La6 9. h6 Dc8 10. h7 Db7 11. Th6 Da7 12. Tc6 dxc6 13. e5 Kd7 14. e6+ Kd6 15. exf7 Kc5 16. d6 e5 17. d7 e4 18. d8=D e3 19. Dd1 Ld6 20. f8=L g6 21. Lh6 e2 22. Lc1 Tf4 23. h8=T Kb4 24. Th1
play all

Cook: 1. e4 h5 2. Dg4 hxg4 3. d4 Th3 4. d5 Tb3 5. Le3 b5 6. Lb6 axb6 7. h4 Ta4 8. h5 La6 9. h6 Dc8 10. h7 Db7 11. Th6 Da7 12. Tc6 dxc6 13. e5 Kd7 14. e6+ Kd6 15. exf7 Kc5 16. d6 e5 17. d7 e4 18. d8=D g6 19. Dd1 Ld6 20. f8=L e3 21. Lh6 e2 22. Lc1 Tf4 23. h8=T Kb4 24. Th1

Alfred Pfeiffer: Die Korrekturfassung 5674v mit gleicher Forderung (fs-99, S.38): 1ss5/d1b5/lbb1b1b1/1bl5/k2t2b1/2t5/BBB2BB1/TSLDKLST soll die Duale der Urfassung (4-fach mögliches Ziehen von g7-g6) nicht mehr enthalten. (2014-11-06)
Henrik Juel: The correction mentioned by Alfred is still cooked, acc. to Euclide 1.01 (2017-11-24)
Joost de Heer: For correction see P1067393. (2023-08-18)
comment

Keywords: Unique Proof Game, Homebase (W), Pronkin Theme (DTL)
Genre: Retro
FEN: 1n4n1/q1p5/bppb2p1/1p6/1k3rp1/1r6/PPP1pPP1/RNBQKBNR
Reprints: 42 Shortest Proof Games 11/1991
Input: Gerd Wilts, 1995-06-03
Last update: Alfred Pfeiffer, 2014-11-06 more...

8 - P0002312
Kostas Prentos
5673 feenschach 93 11-12/1989

(14+11) cooked
BP in 17,5

1. e3 b5 2. Ld3 b4 3. Lg6 b3 4. axb3 hxg6 5. Ta5 Th3 6. Tb5 Tg3 7. hxg3 a5 8. Th8 a4 9. Dh5 a3 10. Se2 Ta4 11. bxa4 gxh5 12. b3 g6 13. Lb2 Lh6 14. Lg7 Lg5 15. Lh6 Lh4 16. gxh4 a2 17. Sg3 a1=T 18. Txg8#
play all

Cook: 1. h4 b6 2. Th3 La6 3. Ta3 h5 4. e3 Lxf1 5. Se2 a6 6. Sg3 Le2 7. Txa6 b5 8. Th6 Ta3 9. Txh8 Tc3 10. a4 Lxd1 11. Ta3 Lf3 12. Tb3 Lb7 13. Txb5 Ta3 14. b3 g6 15. Lb2 Lg7 16. Lxg7 Ta1 17. Lh6 Lc8 18. Txg8#

s. Version P0007474
HHS: "Die Auflösung erscheint zunächst nicht übermäßig schwierig - die TTT schlängeln sich durch die BB hindurch, dabei geht geht der Tg8 über a6, um einen der sB dort wiedererstehen zu lassen. Im 'Gegenzug' vollbringt der Lc8 ein Husarenstück - Dd1 und Lf1 gehen auf sein Konto - aber es funktioniert nicht: Der L kommt nicht über b5 hinweg, denn weder der wT noch der sB (der dort entsteht) haben Zeit, ihm Platz zu machen. Also muß man sich was anderes ausdenken: Die sBB kann man zu einem Überkreuzschlagen der wBBa- und b- ausnutzen: Das erleichtert die Rückführung der linken Türme. Aber das genügt noch nicht: Jetzt braucht Schwarz zuviel Züge. Man muß den Gedanken an den L-Streich aufgeben. Dann können die wFiguren ein analoges Spiel der sB oben rechts ermöglichen. Schwarz schafft die Zugzahl spielend, aber Weiß braucht genau 18 Züge, und das auch nur dann, wenn Tg8 direkt nach g3 kann. Aber was sollte dann der erste wRückzug sein? Bis jetzt hat man die sFiguren problemlos einfach in der NO-Ecke wiedererstehen lassen - man muß auch da einen komplizierteren Modus wählen und darf den wBh- nicht einfach zurückgehen lassen, sondern man muß ihm die Möglichkeit geben, ebenso wie sein sGegenüber den wT auf der h-Linie durchzulassen. Das ist kompliziert und knifflig, aber so und nur so klappt es [dies Wort in Gottes Ohr! HG]. Bestechend ist der Einbau der Verführungen, die immer nur um Haaresbreite scheitern." "Gefällt mir!" (WD als Prüfer) Diese ausgekochten und tollen Kreuzschlagmanöver fand aber leider nur HHS, da es doch eine NL gibt.
Henrik Juel: The content is concealed pawn captures
Despite no visible captures White captured a2xPb3xTa4 to open the a-line for [Ta1,Pa7], and h2xTg3xLh4 with black h7xLg6xDh5 to open the h-line for [Th1,Th8]
This makes life difficult for the human solver and for Natch 3.1, who tested the first 15.0 moves correct in 40 sec.
Testing the entire proof game would need more than a couple of hours by Natch (2018-12-08)
paul: See P0007474 as a version. (2020-11-03)
comment

Keywords: Unique Proof Game, Promotion (t)
Genre: Retro
FEN: 1nbqk1R1/2pppp2/6pB/1R5p/P6P/1P2P1N1/2PP1PP1/rN2K3
Reprints: 143 Shortest Proof Games 11/1991
Input: Gerd Wilts, 1995-06-03
Last update: Mario Richter, 2020-11-04 more...

9 - P0002554
Unto Heinonen
Probleemblad 1991
1. Preis

(16+16) cooked
BP in 43.0

1. h4 a5 2. Th3 Ta6 3. Tf3 Tg6 4. Sh3 Tg3 5. Sf4 Th3 6. g3 Th2 7. Lh3 Sh6 8. Le6 Sf5 9. Lc4 d5 10. Kf1 Th1+ 11. Kg2 Tg1+ 12. Kh3 Kd7 13. Kg4 h5+ 14. Kg5 Th6 15. a4 Tb6 16. T1a3 Kc6 17. Tac3 Tb3 18. Sg6 Ta3 19. b3 Ta2 20. La3 Dd6 21. Lc5 Sd7 22. La7 Sb6 23. Sh8 Kc5 24. La6+ Kb4 25. Tc5 g6 26. Sc3 Lg7 27. Se4 Lc3 28. Da1 Sd4 29. Kh6 Ld7 30. Kg7 Lb5 31. Kf8 Ld3 32. Ke8 Dc6+ 33. Kd8 Sc4 34. Kc8 Ka3 35. Kb8 Lb4 36. Ka8 De8+ 37. Lb8 Sb6+ 38. Ka7 Sa8 39. c4 Sc2 40. Df6 Sa1 41. Db6 Kb2 42. Sf6 Ta3 43. Sd7 Ka2
play all

Cook: NL
1. h4 a5 2. Th3 Ta6 3. Tf3 Te6 4. g3 Te3 5. Lh3 Sh6 6. Le6 Sf5 7. Lc4 d5 8. Kf1 Dd6 9. Kg2 Da6 10. Kh3 Kd7 11. Kg4 h5+ 12. Kg5 Th6 13. a4 Tb6 14. Ta3 Kc6 15. Tc3 Tb3 16. Sh3 Ta3 17. b3 Ta2 18. La3 Sd4 19. Lc5 Lf5 20. La7 Db6 21. Sf4 Kc5 22. Sg6 Kb4 23. Sh8 g6 24. La6 Lg7 25. Tc5 Db5 26. c4 Sc2 27. Sc3 Ka3 28. Se4 Lc3 29. Da1 Lb4 30. Df6 Tc3 31. Kh6 Kb2 32. Kg7 Ta3 33. Kf8 Sd7+ 34. Ke8 Ka2 35. Kd8 Sa1 36. Kc8 Sf8+ 37. Kb8 Sd7+ 38. Ka8 Tc1 39. Lb8 Sb6+ 40. Ka7 Sa8 41. Db6 Tg1 42. Sf6 De8 43. Sd7 Ld3 (Sebastian Natschke)

Henrik Juel: Very good, Sebastian (although not for the author...) (2019-06-17)
paul: Probably the cook of the year, because the problem is well known. Which is now the length record for a capture free proof game? (2019-07-16)
paul: The length record for a capture-free PG is now 40.5 moves by Th. le Gleuher (Phenix50/1997) (2019-07-16)
Mario Richter: The problem Paul was referring to is P0006623. So far it has resisted all my and rawbats' attempts to cook it, and I think that chances are high that it is indeed correct ... (2019-07-17)
James Malcom: See the correction P1386520 (2021-02-15)
more ...
comment

Keywords: Unique Proof Game, Move Length Record, Capture-free, Superseded by (P1386520)
Genre: Retro
FEN: nB2q2N/KppNpp2/BQ4p1/p1Rp3p/PbP4P/rP1b1RP1/k2PPP2/n5r1
Reprints: H17 FIDE Album 1989-1991 1997
feenschach 137 08-09/2000
Input: Gerd Wilts, 1995-06-03
Last update: A.Buchanan, 2022-11-28 more...

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

(13+16) cooked
BP in 34,5

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

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

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

11 - P0007474
Kostas Prentos
5673v feenschach 1989
1. ehrende Erwähnung

(11+14) cooked
BP in 15,0

1. a4 e6 2. Ta3 Ld6 3. Tb3 Lg3 4. Tb6 axb6 5. hxg3 Txa4 6. Th6 Ta1 7. Tg6 hxg6 8. Sa3 Th1 9. Sc4 Dh4 10. Sa5 bxa5 11. gxh4 b6 12. g3 Lb7 13. Lh3 Lg2 14. Lg4 Lh3 15. Lh5 gxh5
play all

Version zur inkorrekten P0002312
Cook: 1. a3 e6 2. h4 Lxa3 3. Sxa3 h5 4. Sb5 Th6 5. Ta6 Tf6 6. Tb6 Tf3 7. Sd4 Th3 8. Sc6 Txh1 9. Sxd8 axb6 10. Sc6 Ta1 11. Sa5 bxa5 12. g3 b6 13. Lg2 Lb7 14. Kf1 Lxg2+ 15. Ke1 Lh3

Kostas Prentos: Here is a computer tested correction: PG 12,5

1. a4 e6 2. Ta3 Ld6 3. Tb3 Lg3 4. Tb6 axb6 5. hxg3 Txa4 6. Th6 Ta1 7. Tg6 hxg6 8. Sa3 Th1 9. Sc4 Dh4 10. Sa5 bxa5 11. e3 b6 12. Dh5 gxh5 13. gxh4

C+ Euclide v1.11 (42 h 2 min 37 sec} (2022-12-08)
more ...
comment

Keywords: Unique Proof Game
Genre: Retro
Computer test: cooked by Stelvio 0.92
FEN: 1n2k1n1/2pp1pp1/1p2p3/p6p/7P/6Pb/1PPPPP2/r1BQK1Nr
Reprints: feenschach 115 01-09/1995
Input: Gerd Wilts, 1996-08-31
Last update: A.Buchanan, 2022-12-04 more...

12 - P0007482
Alexander Kislyak
6848v feenschach 116 10/1995
Peter Kniest zum Gedenken

(12+11) cooked
BP in 13.5

Autor: "Reines Epaulettenmatt durch Rochade (vgl. mit f-111/6634)."

Moldenhauer: Computerprüfung: C+ Stelvio 1.2 03:15:11 Stunden. (hh:mm:ss)
C+ Euclide 1.11 01:00:47 Stunde.
Stelvio und Euclide finden nur 1 Lösung! Warum cooked?
Keine Lösung: BP12.5, BP 13.0.
Notation: 1.a4 Sf6 2.a5 Tg8 3.a6 bxa6 4.Txa6 Lb7 5.Txf6 a5 6.Txf7 Sa6
7.Txf8+ Kxf8 8.h4 De8 9.h5 Dxh5 10.f3 Dxf3 11.Sh3 Da3 12.e3 Te8
13.Lxa6 Lc8 14.0–0+#
Epaulettenmatt durch Rochade ist OK. (2023-05-28)
comment

Keywords: Unique Proof Game, Castling
Genre: Retro
FEN: 2b1rkr1/2ppp1pp/B7/p7/8/q3P2N/1PPP2P1/1NBQ1RK1
Reprints: (2) Die Schwalbe 164 04/1997
Input: Gerd Wilts, 1996-08-31
Last update: James Malcom, 2021-01-24 more...

13 - P0007513
Friedrich Hariuc
2546 feenschach 43 08-11/1978

(13+13) C+
BP in 20,0
Welche Rochade(n) muß(müssen) ausgeführt werden?

1. g3 d6 2. Lg2 Ld7 3. Lc6 Dc8 4. Lb5 Lc6 5. Sf3 Sd7 6. 0-0 Sb6 7. Kh1 Dh3 8. Tg1 Df1 9. Sc3 Dxd1 10. Sd5 Dxc1 11. Sxe7 Dxa1 12. Sg6 Se7 13. Sxh8 Sg6 14. Kg2 Df1+ 15. Kxf1 Le7 16. Ke1 Kf8 17. Kd1 Kg8 18. Kc1 Tf8 19. Td1 Sa8 20. Se1 Lh1
play all

Moldenhauer: Computerprüfung: C+ Stelvio 2.1 ca. 30 Minuten. 3S/12P 64 GB Hash.
Der Cook ist keine Cook weil die Endstellung nicht mit dem Diagramm
zusammenstimmt. Letzter Zug Lf3?
Nur die weiße kleine Rochade fand wirklich statt.
Keine Lösung: BP 19.5. (2024-03-24)
A.Buchanan: Please forgive me for being stubborn, but I don't think just checking BP20.0 & BP19.5 is sufficient for C+. The test must include BP19.0 & BP18.5, and these should be very quick to test compared to the first two. They can be done first, which would allow for some short cooks to be identified more quickly. Maybe Stelvio could offer an option for this "fourfold" test, to save on typing, which is the main inconvenience? (2024-03-25)
Moldenhauer: Hi Andrew, diese Frage hatten wir schon einmal. Damals antwortete Reto darauf.
In der Dokumentation zu Stelvio 2.1, Seite 6 unten und Seite 7 oben, steht die Erklärung. (2024-03-25)
A.Buchanan: Thanks Moldenhauer. Yes, Reto responded today to say: "Actually 20 and 19.5 are sufficient, Stelvio always checks for any solutions of same parity, so 20 includes 19, 18, ... and 19.5 includes 18.5, 17.5... I can see your point with adding an option for automatic double checking, I've added it to my list."
That's great, so in my opinion the PDB C+ report needs to indicate that Stelvio has also tested for the shorter solutions of the same parity, as this is tool-dependent behaviour which future readers might not know. Ideally this statement would appear at the end of the Stelvio output, as a kind of "certificate" that could be copied to PDB.
A problem with this whole issue is that there are different choices being made by different people. It complicates things unnecessarily. I think C+ for a PG should mean that the three shorter lengths have also been explored. This should be doable without getting into the fraught question of whether a shorter solution cooks a PG, although in my opinion it does, whatever the parity: a PG is just a diagram. Conceptually to me, PG in x.y is just SPG, with a courtesy hint to the solver of what length they are looking for. (2024-03-26)
comment

Keywords: Unique Proof Game, Castling, Castling Paradox (wk hidden wdsk fake)
Genre: Retro
Computer test: C+ Stelvio 2.1 ca. 30 Minuten. 3S/12P 64 GB Hash
FEN: n4rkN/ppp1bppp/3p2n1/1B6/8/6P1/PPPPPP1P/2KRN2b
Input: Gerd Wilts, 1996-08-31
Last update: James Malcom, 2024-03-25 more...

14 - P0008204
Unto Heinonen
3230 U.S. Problem Bulletin 99/100 01-04/1995
1. Preis

(13+15) C+
BP in 27,0

1. g4 a5 2. g5 a4 3. g6 a3 4. gxh7 axb2 5. a4 bxa1=T 6. Lb2 g5 7. Lg7 b5 8. Lh6 Lg7 9. a5 Lc3 10. a6 Sf6 11. a7 Tg8 12. h8=S Lb7 13. Sg6 Lxh1 14. Sf4 Sc6 15. Sh5 Db8 16. f4 Db6 17. Sf3 0-0-0 18. a8=L Se5 19. Le4 Ta8 20. Lh7 La5 21. Sc3 g4 22. Da1 g3 23. Sd1 g2 24. Dd4 Tg3 25. Dg1 Th8 26. Sd4 Ta3 27. c3 Ta1
play all

D. Meinking: 1st Prize, USPB 1995-1997 (2002-07-06)
paul: The report of the judge G. Lauinger in StrateGems 19/2002 (2021-10-29)
comment

Keywords: Unique Proof Game, Interchange (ttt), Castling, Promotion
Genre: Retro
Computer test: C+ by Stelvio beta from Reto Aschwanden
FEN: r1k4r/2pppp1B/1q3n1B/bp2n2N/3N1P2/2P5/3PP1pP/r2NKBQb
Reprints: feenschach 153 10-12/2003
Input: Gerd Wilts, 1996-09-11
Last update: A.Buchanan, 2022-11-27 more...

15 - P0008568
Unto Heinonen
Springaren 1996
2. Preis

(13+12) C+
BP in 19,0

1. b4 c5 2. b5 Dc7 3. b6 Dg3 4. hxg3 h6 5. Txh6 axb6 6. Tc6 Txa2 7. Sa3 Txc2 8. Lb2 Tc4 9. Sc2 Tch4 10. e4 g6 11. Lc4 Lh6 12. Se2 Le3 13. dxe3 e6 14. Dd3 Se7 15. 0-0-0 0-0 16. Txc8 Sc6 17. Ta8 Th8 18. Ta1 Ta8 19. Th1 Sb8
play all

more ...
comment

Keywords: Unique Proof Game, Interchange (TTtt), Castling, Switchback (s)
Genre: Retro
Computer test: Resolution time : 1 h 24 mn 24.56 s., Natch 2.3 Copyright (C) 1997,98,99,2001,2002,2003,2004 Pascal Wassong
paul: Stelvio 2.0 found the solution in 2 minutes.
FEN: rn4kr/1p1pnp2/1p2p1p1/2p5/2B1P3/3QP1P1/1BN1NPP1/R1K4R
Reprints: Tim Krabbé's Website (57) 2000
feenschach 153 10-12/2003
H24 FIDE Album 1995-1997 2004
(79) Die Schwalbe 250A 08/2011
Input: Gerd Wilts, 1997-01-09
Last update: A.Buchanan, 2024-04-05 more...

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

(15+14) C+
BP in 23.0

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

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

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

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

17 - P0009164
Satoshi Hashimoto
PR16 Problem Paradise 12 01-03/1999
1. Preis

(13+14) C+
BP in 21,5

1. a4 Sc6 2. a5 Tb8 3. a6 bxa6 4. Ta4 Tb3 5. Th4 Tc3 6. dxc3 g5 7. Dd6 exd6 8. Le3 Df6 9. Sd2 Df3 10. exf3 g4 11. Ld3 g3 12. Se2 gxh2 13. Sg3 h5 14. Ke2 Lh6 15. Ta1 h1=T 16. Taa4 Ta1 17. Th1 Ta2 18. Ta1 Sd4+ 19. Ke1 Sb5 20. Tah4 c5 21. Th1 h4 22. Lf1
play all

Henrik Juel: Natch 3.1 made no progress after half an hour (2018-12-13)
Moldenhauer: Computerprüfung: C+ Stelvio 1.11 00:06:29 Minuten. (hh:mm:ss)
Keine Lösung: BP 20.5, BP 21.0. (2023-03-16)
comment

Keywords: Unique Proof Game, Pure Round Trip (TT)
Genre: Retro
Computer test: Stelvio 1.11, Natch
FEN: 2b1k1nr/p2p1p2/p2p3b/1np5/7p/2P1BPN1/rPPN1PP1/R3KB1R
Reprints: feenschach 153 10-12/2003
9 64 Proof Games 2012
Input: Gerd Wilts, 1999-02-27
Last update: Silvio Baier, 2023-03-20 more...

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

(14+14) cooked
KBP?

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

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

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

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

19 - P1000370
Paul Raican
7672v feenschach 131 01-05/1999
Lavinia gewidmet

(16+16) cooked
BP in 12,5
Platzwechselcirce

1. Sf3 Sc6 2. Sd4 Sxd4[+wSc6] 3. Sxd8[+sDc6] Dxc2[+wBc6] 4. f3 Dxc1[+wLc2] 5. Lxh7[+sBc2] cxd1=S[+wDc2] 6. Le4 Se3+ 7. Kf2 Dxf1[+wLc1]+ 8. Kxe3[+sSf2] Sxe4[+wLf2] 9. Kxd4[+sSe3] Dxf2[+wLf1] 10. dxe3[+sSd2] Dxe3[+wBf2]+ 11. Kd5 Dh6 12. Sxd2[+sSb1] Dxc6[+wBh6] 13. Sxc6[+sDd8]
play all

paul: démoli : 6.d3 Dh6 7.Fé4 D×ç6(h6) 8.C×ç6(Dd8) Cf2 9.Rd2 C×d3(f2) 10.R×d3(Cd2) C×é4(Fd2) 11.R×d4(Cd3) Cç1 12.F×ç1(Cd2) C×b1(Cd2) 13.Rd5 (2021-09-20)
more ...
comment

Keywords: Circe (Platzwechsel-), Unique Proof Game
Genre: Retro, Fairies
FEN: r1bqkbnr/ppppppp1/2N4P/3K4/4n3/5P2/PPQNPPPP/RnB2B1R
Reprints: feenschach 248 08-10/2001
feenschach 144, p. 310, 11-12/2001
Input: Gerd Wilts, 2000-08-01
Last update: A.Buchanan, 2021-09-21 more...

20 - P1000376
Manfred Rittirsch
7678 feenschach 131 01-05/1999

(11+14)
BP in 15,0
Isardam

1. d4 a5 2. Lh6 gxh6 3. h4 Lg7 4. Th3 Lxd4 5. Te3 Sf6 6. Te6 dxe6 7. e3 Sbd7 8. La6 bxa6 9. c4 Lb7 10. c5 Lxg2 11. c6 Dc8 12. cxd7+ Lc6 13. dxc8=L e5 14. Lh3 Sg8 15. Lf1 0-0-0
play all

Weiß kann im 13. Zug nicht dxe8 spielen, da das Feld e8 von Figuren aller vier Arten beobachtet ist.

paul: The last eight moves checked by Popeye 4.55:
a=b8 13 + 16
Isardam

1.Bf1-a6 b7*a6 2.c2-c4 Bc8-b7 3.c4-c5 Bb7*g2 4.c5-c6 Qd8-c8 5.c6*d7 + Bg2-c6 6.d7*c8=B e6-e5 7.Bc8-h3 Sf6-g8 8.Bh3-f1 0-0-0 a=b

solution finished. Time = 1:44:59 h:m:s (2010-12-26)
paul: And the first 12.5 verified by Jacobi. (2022-01-01)
comment

Keywords: Unique Proof Game, Isardam, Pronkin Theme (L), Switchback (s)
Genre: Retro, Fairies
FEN: 2kr2nr/2p1pp1p/p1b4p/p3p3/3b3P/4P3/PP3P2/RN1QKBN1
Reprints: H39 FIDE Album Annexe 1998-2000 2009
Input: Gerd Wilts, 2000-08-01
Last update: A.Buchanan, 2014-05-20 more...

21 - P1000406
Gianni Donati
8076 feenschach 135 01-05/2000
2. Preis

(14+15) C+
BP in 18,5

1. c3 d6 2. Da4+ Ld7 3. b3 Sf6 4. La3 Se4 5. Lc5 Sxd2 6. e4 Sxb1 7. Lb5 Sa3 8. 0-0-0 Sc2 9. Td5 Sa1 10. Te5 d5 11. Kb2 d4 12. Ka3 d3 13. Dd4 d2 14. Kb4 d1=L 15. a3 L1g4 16. Sf3 Lc6 17. Td1 Lc8 18. Td3 L6d7 19. Lxd7+
play all

Henrik Juel: This fine proof game by Gianni is faster to solve by hand than by computer
Last move was not 19.Lb5xPd7+, because Sa1 did an uneven number of moves; 18.Lb5xPd7+ fails, because White needs 19 moves, since Td1-d5 must happen early. So [Pd7] has promoted, and Black must play 1... d6 and 2... Dd7 or Ld7; only the latter works
Partially tested by Natch 3.1 in 18.0 moves with wLb5 and sDTLSPd7; only L works (2018-12-14)
more ...
comment

Keywords: Unique Proof Game, Pronkin Theme (l)
Genre: Retro
Computer test: Computerprüfung: C+ Euclide 1.11 nach 237 Std. 28 Min. Keine Lösung bei BP 17,5 , geprüft in 1 Min. Computerprüfung: C+ auch Stevio 1.11 00:27:56 Minuten. (hh:mm:ss) Keine Lösung: BP 18.0. 4994/419k Histogramm.
FEN: rnbqkb1r/pppBpppp/8/2B1R3/1K1QP3/PPPR1N2/5PPP/n7
Reprints: Quartz 25 07-09/2004
Input: Gerd Wilts, 2000-08-01
Last update: A.Buchanan, 2023-05-14 more...

22 - P1000447
Michel Caillaud
R5v Problemesis 10 08/1999
3. Preis

(15+14) C+
BP in 17,0

1. a4 a5 2. Ta3 Ta6 3. Tb3 Tc6 4. Tb6 g6 5. Ta6 Lh6 6. Ta8 Sa6 7. Txc8 Sb4 8. Ta8 Db8 9. Ta6 Kd8 10. Tb6 cxb6 11. f3 Tc8 12. Kf2 Sc6 13. b4 Dc7 14. bxa5 Ta8 15. a6 Kc8 16. a5 Dd8 17. Kg3 Sb8
play all

Richter H. Gruber "What a correction! Making the previously cooked R5 sound (hopefully), the author simultaneously improved it substantially : Instead of 'only' two, now we have three capture-free black circuits (Dd8, Ta8, Sb8). Everything is based on the need to capture sLc8, and it is achieved virtuously. It is not apparent that sTa8 and sSb8 have to move at all. This makes R5v clearly superior to a number of related tourney entries showing multiple switchbacks (cf. 3rd and 4th Hon. Men.). "

paul: Correction of P1000446 (2022-02-06)
Henrik Juel: There is a funny english error in the judge comment
He probably wanted to say that the author performed like a virtuoso, but wrote 'and it is achieved virtuously.', which has a completely different meaning (2022-02-06)
A.Buchanan: This is very impressive. (2022-02-07)
comment

Keywords: Unique Proof Game, Pure Round Trip (dst)
Genre: Retro
Computer test: Stelvio 1.2, 2:30min
FEN: rnkq2nr/1p1ppp1p/Pp4pb/P7/8/5PK1/2PPP1PP/1NBQ1BNR
Reprints: feenschach 141 06/2001
Input: Gerd Wilts, 2000-08-01
Last update: Reto, 2023-05-11 more...

23 - P1000474
Andrey Frolkin
Mikhailo Kozulya
P0055 StrateGems 10 04-06/2000
Thomas Volet gewidmet
2. Preis

(15+6) C+
BP in 17,5

1. e3 h5 2. Dg4 hxg4 3. Se2 Th3 4. Tg1 Tf3 5. gxf3 e5 6. Lg2 e4 7. fxe4 d5 8. exd5 Sc6 9. dxc6 Lb4 10. cxb7 Lc3 11. bxc3 Dd4 12. cxd4 Lf5 13. Sbc3 Kd7 14. Tb1 Te8 15. Tb2 Te5 16. dxe5 Sf6 17. exf6 Lh7 18. fxg7
play all

Weiße Bauern b2 und g2 schlagen diagonal über Kreuz nach g7 und b7.

more ...
comment

Keywords: Unique Proof Game, Volet Pawn (2)
Genre: Retro
Computer test: C+ Euclide 1.11 in 16 Std. 23 Min. Keine Lösung in BP 16,5, Zeit 50 Min. C+ Stelvio 1.4 in 17 seconds.
FEN: 8/pPpk1pPb/8/8/6p1/2N1P3/PRPPNPBP/2B1K1R1
Reprints: feenschach 153 10-12/2003
Input: Gerd Wilts, 2000-08-01
Last update: A.Buchanan, 2023-08-30 more...

24 - P1000475
Michel Caillaud
P0056 StrateGems 10 04-06/2000
4. Preis

(15+15) C+
BP in 18,5

1. a4 e5 2. a5 e4 3. Ta4 e3 4. Te4+ Se7 5. b4 Sbc6 6. Lb2 Sd4 7. Dc1 Sxe2 8. Lf6 Sg3 9. d4 Sgf5 10. Ke2 Sh6 11. Kf3 Shg8 12. Kg4 e2 13. Dh6 e1=S 14. Se2 Sd3 15. Sc1 Sc5 16. Ld3 Sa6 17. The1 Sb8 18. T1e3 a6 19. Txe7+
play all

Pronkin-Thema mit Platzwechsel: Sg8 wird auf e7 geschlagen, sSb8 wandert nach g8, umgewandelter sSe1 geht nach b8. Zyklischer Platzwechsel von sSb8, sSg8 und sBe7.

Henrik Juel: Partial testing with Natch 3.1
18.0 moves with sDTLSPe7 and wTd5; only sSe7 works (2018-12-14)
Mario Richter: @Henrik: Did you mean "... and wTe4"? (2018-12-15)
Henrik Juel: Yes, I did, Mario (2018-12-16)
more ...
comment

Keywords: Unique Proof Game, Pronkin Theme (s), Interchange
Genre: Retro
Computer test: Computerprüfung: C+ Stelvio 1.2 04:02:35 Stunden. (hh:mm:ss) Keine Lösung BP 17.5, BP 18.0. Checked by Stelvio 1.2 in about 5 hours.
FEN: rnbqkbnr/1pppRppp/p4B1Q/P7/1P1P2K1/3BR3/2P2PPP/1NN5
Reprints: (7) Quartz 21 07-09/2002
feenschach 153, p. 201, 10-12/2003
Input: Gerd Wilts, 2000-08-01
Last update: A.Buchanan, 2023-05-30 more...

25 - P1000488
Thierry Le Gleuher
P0030 StrateGems 04-06/1999
Sam Loyd gewidmet
3. Preis

(14+14) C+
BP in 25,5

1. d4 g5 2. Lf4 g4 3. Kd2 g3 4. hxg3 Sc6 5. Th6 Se5 6. Tb6 Sf3+ 7. exf3 axb6 8. Lc4 Ta3 9. Df1 Tc3 10. Sa3 h5 11. Te1 h4 12. Te6 h3 13. Tc6 dxc6 14. Ke2 Lf5 15. Le6 Da8 16. Lc8 e6 17. d5 Se7 18. d6 Sg6 19. d7+ Ke7 20. d8=T Th4 21. Td1 Sh8 22. Ta1 Kd8 23. Sb1 La3 24. Lc1 Tb4 25. Ld7 Le4 26. Dd1
play all

Hervorragend: Pronkin-Thema mit dem völlig eingeschlossenen wTa1, Switchback von Sb1, Lc1 und Dd1. Ein Rätsel im Geiste von Sam Loyd.

Henrik Juel: Natch 3.1 did nothing for an hour (2018-12-13)
Moldenhauer: Computerprüfung: C+ Stelvio 1.0 © Reto Aschwanden
33 Minuten, 1 Lösung, Notation OK.
Stelvio Histogramme/Strategien 40, vor der Lösung wegen der Lösezeit
mit Stelvio berechnet. (2023-02-08)
comment

Keywords: Unique Proof Game, Pronkin Theme (T), Switchback (SLD)
Genre: Retro
Computer test: Stelvio 1.0
FEN: q2k3n/1ppB1p2/1pp1p3/8/1r2b3/b1r2PPp/PPP1KPP1/RNBQ2N1
Reprints: feenschach 153 10-12/2003
A) Quartz 23 01-03/2004
H57 FIDE Album 1998-2000 2007
Input: Gerd Wilts, 2000-08-01
Last update: Silvio Baier, 2023-03-02 more...

26 - P1000563
Michel Caillaud
Noam Livnat
P0019 StrateGems Vol.1 10-12/1998
3. Preis

(16+15) cooked
BP in 21,5

1. c4 b5 2. Da4 b4 3. Db5 g6 4. a4 Lg7 5. Ta3 Kf8 6. Td3 d6 7. Txd6 a6 8. d3 Ta7 9. Lf4 Tb7 10. Le5 Tb6 11. f4 Tc6 12. Kf2 Tc5 13. Kg3 Td5 14. Kh4 Td4 15. g3 Te4 16. Lh3 Te3 17. Lg4 Tf3 18. Sh3 Tf2 19. Tf1 Tg2 20. Tf3 Tg1 21. Te3 Th1 22. Te4
play all

Treppenturm
Cook: Dual
7. ... Sa6 8. d3 Tb8 9. Lf4 Tb6 10. Le5 Tc6 11. f4 Tc5 12. Kf2 Td5 13. Kg3 Td4 14. Kh4 Te4 15. g3 Te3 16. Lh3 Tf3 17. Lg4 Tf1 18. Sh3 Te1 19. Tf1 Sb8 20. Tf3 Th1 21. Te3 a6 22. Te4 (Henrik Juel)

A.Buchanan: the authors fixed this in 1998 C+ with 1sbq1ksr/2p1ppbp/p2R2p1/1Q2B3/PpP1BP1K/3P1SP1/1P2P2P/R4S1r
16. Lg2 Te3 17. Le4 Tf3 18. Sd2 Tf2 19. Sgf3 Tg2 20. Ta1 Tg1 21. Sf1 Th1 (2023-02-04)
more ...
comment

Keywords: Unique Proof Game, Staircase (t)
Genre: Retro
FEN: 1nbq1knr/2p1ppbp/p2R2p1/1Q2B3/PpP1RPBK/3P2PN/1P2P2P/1N5r
Reprints: feenschach 153, p. 195, 10-12/2003
H30 FIDE Album Annexe 1998-2000 2009
Input: Gerd Wilts, 2000-08-01
Last update: Alfred Pfeiffer, 2018-12-19 more...

27 - P1000642
Satoshi Hashimoto
R048 Probleemblad 03/1999
3. Preis

(14+15) C+
BP in 23,0

1. e4 Sf6 2. Df3 Sh5 3. Df6 exf6 4. e5 Ld6 5. e6 0-0 6. e7 Sc6 7. e8=D Tb8 8. De4 Te8 9. Ld3 Te5 10. Se2 Tb5 11. 0-0 Tb3 12. axb3 Kf8 13. Ta6 bxa6 14. Da4 Tb5 15. Le4 Te5 16. d3 Te8 17. Lf4 Ke7 18. Sd2 Th8 19. Ta1 Ke8 20. Kf1 Lf8 21. Ke1 Se7 22. Sf1 c6 23. Lb8 Sg8
play all

Weiß und Schwarz haben klein rochiert, wTa1 stammt von h1, sTh8 stammt von a8.

Henrik Juel: Natch 3.1 did nothing in almost an hour (2018-12-13)
more ...
comment

Keywords: Unique Proof Game, Impostor (Tts), Switchback (Kkl), Castling, Promotion
Genre: Retro
Computer test: Moldenhauer: Computerprüfung: C+ Stelvio 1.11 84:43:01 Stunden. (hh:mm:ss) Keine Lösung: BP 22.0, BP 22.5. Oder auch Stelvio 2.1 in 25min.
FEN: 1Bbqkbnr/p2p1ppp/p1p2p2/7n/Q3B3/1P1P4/1PP1NPPP/R3KN2
Reprints: feenschach 153, p. 195, 10-12/2003
82 Die Schwalbe 250A, p. 260, 08/2011
7 64 Proof Games 2012
Input: Gerd Wilts, 2000-08-01
Last update: Reto, 2024-03-10 more...

28 - P1000709
Unto Heinonen
R022 Probleemblad 05/1998
1. Preis

(14+16) C+
BP in 23,0

1. Sf3 h5 2. Se5 Th6 3. Sg4 e5 4. a3 Lxa3 5. e4 Le7 6. Ta6 c5 7. Tc6 a5 8. Lb5 Ta6 9. La4 b5 10. Df3 Lb7 11. Tc8 Lxe4 12. Kd1 Lc6 13. Te1 d5 14. Te4 Sd7 15. Tf4 Sb6 16. Tf6 Kd7 17. Te6 f5 18. Da3 Lf6 19. Te8 Se7 20. d3 Ke6 21. Lg5 Dd6 22. Lh4 g5 23. Ted8 Sg6
play all

more ...
comment

Keywords: Unique Proof Game, Ornament
Genre: Retro
Computer test: Natch 3.1 Stelvio 2.0 solves this PG in 3 minutes.
FEN: 2RR4/8/rnbqkbnr/pppppppp/B5NB/Q2P4/1PP2PPP/1N1K4
Reprints: feenschach 153 10-12/2003
Input: Gerd Wilts, 2000-08-13
Last update: A.Buchanan, 2024-04-05 more...

29 - P1000920
Unto Heinonen
R063c Probleemblad 09-10/2000
2. Preis

(12+8)
BP in 18,5

1. a4 b5 2. axb5 Sa6 3. Txa6 d5 4. Tg6 hxg6 5. b4 Th3 6. La3 Tg3 7. hxg3 Sh6 8. Txh6 Lh3 9. gxh3 gxh6 10. Lg2 Lg7 11. Le4 Lc3 12. dxc3 a5 13. Kd2 dxe4 14. Kc1 e3 15. De1 Dd1+ 16. Kb2 0-0-0 17. bxa5 Td3 18. Ld6 exd6 19. cxd3
play all

5 Überkreuzschläge von Bauern.

Henrik Juel: Natch 3.1 did nothing in half an hour (2018-12-14)
paul: Correction of P1000629 (2022-10-12)
comment

Keywords: Unique Proof Game, Castling (sg), Cross-capture (5)
Genre: Retro
FEN: 2k5/2p2p2/3p2pp/PP6/8/2PPp1PP/1K2PP2/1N1qQ1N1
Reprints: feenschach 153, p. 195, 10-12/2003
H28 FIDE Album Annexe 1998-2000 2009
Input: Gerd Wilts, 2000-10-12
Last update: Alfred Pfeiffer, 2018-12-20 more...

30 - P1001146
Satoshi Hashimoto
(13) Probleemblad 03/1999

(14+16) C+
BP in genau 6,5

1. e3 Sf6 2. e4 Sxe4 3. Sa3 Sc3 4. Tb1 Sxb1 5. Sb5 Sa3 6. Sc3 Sc4 7. Sb1
play all

Mario Richter: brauchen wir wirklich zwei verschiedene Keywords - hier "Tempoverlustmanöver", bei z.B. P1007491 hingegen "Loss of tempo"? (2018-10-21)
Henrik Juel: Good point, Mario
Other things in the never-ending Keyword discussion include:
Tempoverlustmanöver is currently called the same in english and french, and has no definitions
Loss of tempo (Tempoverlust in german) is defined as
'With White to play, a sequence of moves to reach the same position with Black to play. (Help game, abbr .: TV)'
which makes little sense in proof games
In this problem [Pe2] goes e2-e3-e4 ('wasting' a move)
In P1007491 [Pc2] similarly goes c2-c3-c4-... and [Lc8] goes (among other things) c8-b7-a6-c8 ('triangulation') (2018-10-21)
Henrik Juel: There are many solutions in 6.0 moves, like
1.Sb1-c3 Sg8-f6 2.Pe2-e4 Sf6xe4 3.Sc3-a4 Se4-c3 4.Ra1-b1 Sc3xb1 5.Sa4-c3 Sb1-a3 6.Sc3-b1 Sa3-c4
Correction: Change the stipulation to
BP in exactly 6.5 (2024-03-10)
comment

Keywords: Unique Proof Game, Pure Round Trip (S), Homebase (w), Tempo Losing Manouevre (weP)
Genre: Retro
Computer test: (Natch 1.3 Copyright (C) 1997-1999 Pascal Wassong)
FEN: rnbqkb1r/pppppppp/8/8/2n5/8/PPPP1PPP/1NBQKBNR
Reprints: (2) Schweizerische Schachzeitung 05/2005
Input: Gerd Wilts, 2001-02-11
Last update: A.Buchanan, 2024-03-11 more...

31 - P1001272
Jasper van Atten
Probleemblad 1990-1991
2. Preis

(14+13) C+
BP in 24,0

1. d4 g5 2. d5 g4 3. d6 g3 4. dxe7 d5 5. e4 Kd7 6. e8=T d4 7. Te6 d3 8. Ta6 bxa6 9. e5 Kc6 10. e6 Sd7 11. e7 Tb8 12. e8=D Tb5 13. De3 Sc5 14. Dh5 Sb3 15. Db6+ cxb6 16. Le3 d2+ 17. Ke2 Lb4 18. Ld4 d1=L+ 19. Kd3 Lf3 20. gxf3 g2 21. Se2 g1=S 22. Sg3 Se2 23. Tg1 Sc3 24. bxc3 Lf5+
play all

Cerian-Frolkin-Thema, Allumwandlung (DTls)

more ...
comment

Keywords: Ceriani-Frolkin Theme (DTls), Unique Proof Game, Allumwandlung
Genre: Retro
Computer test: Resolution time : 46 mn 50.33 s., Natch 2.3 Copyright (C) 1997,98,99,2001,2002,2003,2004 Pascal Wassong
FEN: 3q2nr/p4p1p/ppk5/1r3b1Q/1b1B4/1nPK1PN1/P1P2P1P/RN3BR1
Reprints: feenschach 137 08-09/2000
(G) Quartz 26 10-12/2004
Input: Gerd Wilts, 2001-08-29
Last update: A.Buchanan, 2022-06-23 more...

32 - P1001275
Unto Heinonen
The Problemist 1991-1992
2. Preis

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

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
play all

17-zügige Wanderung des wK bis nach h3 zum Tempoverlust.

paul: Un dernier coup noir s'impose. Voir P0005906. (2010-05-08)
Moldenhauer: Computerprüfung: C+ Stelvio 1.0 1 Sekunde.
Keine Lösung: BP 24.5, BP 25.0. (2023-02-17)
Reto: There are in fact solutions in exactly 25.0 moves and Stelvio finds those. So the above comment is incorrect. (2023-06-12)
Moldenhauer: Danke für die Korrektur. In meiner Worddatei im Bildschirmausschnitt steht cooked,
also habe ich die Eingabe hier falsch gemacht. Sorry! (2023-11-05)
comment

Keywords: Unique Proof Game, Promenade (K), Tempo Loss (K17)
Genre: Retro
Computer test: Stelvio 1.0
FEN: 2r3n1/3npp1N/3bb3/rppp2p1/1qb3k1/8/PP1PPPPP/R1B1KB1R
Reprints: feenschach 137 08-09/2000
H25 FIDE Album Annexe 1992-1994 2003
Input: Gerd Wilts, 2001-08-29
Last update: Silvio Baier, 2023-03-02 more...

33 - P1003973
Michel Caillaud
R55 Problemesis 26 04/2002
2. Preis

(16+11) C+
BP in 18,0

1. d4 c5 2. d5 Db6 3. Dd4 Db3 4. axb3 f5 5. Ta6 f4 6. Tc6 f3 7. Sxf3 e5 8. Sxe5 a5 9. Sxd7 a4 10. bxa4 h5 11. b3 h4 12. Lb2 h3 13. Dh4 Sa6 14. f4 Sb4 15. Kf2 Sd3+ 16. Kg1 Se5 17. Sb8 Sd7 18. Sa6 Sb8
play all

Rundlauf des sSb8 in 6 Zügen.

Henrik Juel: Natch 3.1 found the solution quickly, but did not finish in more than an hour (2018-12-16)
Moldenhauer: Computerprüfung: C+ Stelvio 1.0 nach nur 1 Sekunde. (2023-02-09)
Henrik Juel: and no solution in 17.5 moves, so C++ Stelvio 1.0 (2023-02-09)
Henrik Juel: Fine motivation for the round trip: making room for white Sd7-b8-a6 (2023-02-09)
comment

Keywords: Unique Proof Game, Pure Round Trip (s)
Genre: Retro
Computer test: Stelvio 1.0
FEN: rnb1kbnr/1p4p1/N1R5/2pP4/P4P1Q/1P5p/1BP1P1PP/1N3BKR
Reprints: feenschach 153 10-12/2003
(H) Quartz 28 07-09/2005
Input: Gerd Wilts, 2002-03-31
Last update: Silvio Baier, 2023-03-02 more...

34 - P1003986
Dan Meinking
R0099 StrateGems 18 04-06/2002
5.-7. Preis ex aequo

(15+15) C+
BP in 20,0

1. g4 h5 2. Lg2 Th6 3. Le4 Td6 4. Lh7 g6 5. h4 Lg7 6. Th3 Ld4 7. Ta3 Lb6 8. c3 c5 9. Da4 Dc7 10. Dd4 Dc6 11. Dh8 Dh1 12. f3 f6 13. Kf2 Kf7 14. Sh3 Sh6 15. Dxc8 Dxc1 16. Dc6 Dc2 17. Ke1 Df5 18. De4 Sc6 19. Kd1 Th8 20. Kc1 Ke8
play all

Henrik Juel: Natch 3.1 did not find the solution in half an hour (2018-12-16)
more ...
comment

Keywords: Unique Proof Game
Genre: Retro
Computer test: Computerprüfung: C+ Stelvio 1.0 01:37:02 Stunde. Keine Lösung: BP 19.0, BP 19.5.
FEN: 5k1r/pp1pp2B/1bnr1ppn/2p2q1p/4Q1PP/R1P2P1N/PP1PP3/RNK5
Reprints: feenschach 153, p. 209, 10-12/2003
Input: Gerd Wilts, 2002-04-05
Last update: A.Buchanan, 2023-03-01 more...

35 - P1004001
Michel Caillaud
R0093 StrateGems 17 01-03/2002
Gianni Donati gewidmet
2.-4. Preis ex aequo

(16+16) C+
BP in 20,5

1. Sc3 e5 2. Sd5 Df6 3. Se7 d5 4. e4 Lf5 5. De2 Sd7 6. Da6 Td8 7. De6 Sb6 8. Dc8 Sh6 9. Sc6 Lb4 10. Da8 Lc3 11. Sb8 Td6 12. Lb5+ Kd8 13. Ld7 Tc6 14. Lc8 Tc5 15. Sd7 Dc6 16. Sf6 Te8 17. Sg4 Te6 18. Se3 Tg6 19. Sc4 Tg4 20. Sa3 Lg6 21. Sb1
play all

Spektakuläre Wanderung des wSb1 über e7 nach b8 und zurück zwecks Schachschutz.

Moldenhauer: Computerprüfung: C+ Stelvio 1.0 33:18 Minuten.
Keine Lösung BP 20.0, BP 19.5.
Bitte Notation richtigstellen: 19.Sc4 Tg5 (2023-02-13)
comment

Keywords: Unique Proof Game, Promenade (S), Capture-free
Genre: Retro
Computer test: Stelvio 1.0
FEN: Q1Bk4/ppp2ppp/1nq3bn/2rpp1r1/4P3/2b5/PPPP1PPP/RNB1K1NR
Reprints: feenschach 153 10-12/2003
Input: Gerd Wilts, 2002-04-05
Last update: Silvio Baier, 2023-03-02 more...

36 - P1004087
Reto Aschwanden
8618 feenschach 146 03-05/2002
2. Preis

(14+14) C+
BP in 18,5

1. a4 Sa6 2. Ta3 Sc5 3. Td3 a6 4. Td6 cxd6 5. h4 Da5 6. h5 b6 7. h6 Lb7 8. hxg7 Ld5 9. Th6 Sb7 10. Tf6 exf6 11. g4 Se7 12. g8=T Sg6 13. Tg7 Ke7 14. Txh7 Ke6 15. Th1 Th2 16. g5 Tg2 17. Th3 Lh6 18. Ta3 Th8 19. Ta1
play all

Zweimal Pronkin-Thema: beide wTT werden auf d6 bzw. f6 geschlagen, der aus der Umwandlung auf g8 entstandene Turm geht erst nach h1, dann nach a1 zurück.

Vladimir Rey: Update: 2. Preis (source: feenschach 182 2010) (2022-08-04)
comment

Keywords: Unique Proof Game, Pronkin Theme (T)
Genre: Retro
Computer test: Resolution time: Natch 3.3: 7sec, Euclide 1.11: 2sec, Stelvio 1.14: 3sec
FEN: 7r/1n1p1p2/pp1pkpnb/q2b2P1/P7/8/1PPPPPr1/RNBQKBN1
Reprints: idee & form 80 10/2003
Input: Gerd Wilts, 2002-05-10
Last update: Reto, 2023-03-22 more...

37 - P1004175
Rustam Ubaidullajew
11587 Die Schwalbe 196 08/2002
2. Preis

(14+16) C+
BP in 23,0

1. a4 g6 2. Ta3 Lg7 3. Tf3 Lxb2 4. Sa3 La1 5. Lb2 h5 6. Lg7 Th6 7. Lf8 Lh8 8. Da1 b5 9. Dg7 Lb7 10. Dh7 La1 11. Tf6 Lxg2 12. Sf3 Sa6 13. Tg1 Lh1 14. Lh3 Db8 15. Lf5 Db6 16. h3 0-0-0 17. Sh2 La8 18. Kf1 Kb7 19. Kg2 Sc5 20. Kf3 Ka6+ 21. Ke3 Lh1 22. Tg3 Ta8 23. Tf3 Sb7+
play all

Pendelmanöver der sLL.

Moldenhauer: Computerprüfung: C+ Euclide 1.11 in 9 Std. 5 Min. 37 Sek.
Notation OK. Nur eine Lösung! Keine Lösung in BP22.0 und BP 22.5. (2022-12-23)
comment

Keywords: Unique Proof Game, Pendulum (ll x2 x2)
Genre: Retro
Computer test: Stelvio 1.2, 1:40min
FEN: r4Bn1/pnpppp1Q/kq3Rpr/1p3B1p/P7/N3KR1P/2PPPP1N/b6b
Reprints: 264 Shakhmatnaya Kompozitsiya 47 2003
feenschach 161 09-11/2005
Input: Gerd Wilts, 2002-08-27
Last update: Reto, 2023-05-13 more...

38 - P1004211
Dan Meinking
R0115 StrateGems 20 10-12/2002
1. Preis

(12+14) C+
BP in 27,0

1. a4 Sc6 2. Ta3 Sd4 3. Tg3 Sb5 4. Tg6 hxg6 5. b3 Th3 6. Lb2 Te3 7. Lf6 e5 8. dxe3 Le7 9.
Dd6 cxd6 10. a5 Dxa5 11. Kd1 b6 12. Sf3 Lb7 13. Sfd2 Lf3 14. gxf3 Ld8 15. Lh3 Lc7 16. Le6
fxe6 17. Kc1 Kf7 18. Td1 Tf8 19. Sf1 De1 20. h4 a5 21. h5 a4 22. h6 a3 23. h7 a2 24. h8=T
a1=T 25. Th2 Ta7 26. Sc3 Sh6 27. Sa2 Kg8
play all

Henrik Juel: Natch 3.1 did little in an hour (2018-12-16)
Vladimir Rey: Fix: P0115 StrateGems; 10. a5 Dxa5+ (2023-01-21)
comment

Keywords: Unique Proof Game
Genre: Retro
Computer test: Stelvio 1.2, 58min
FEN: 5rk1/r1bp2p1/1p1ppBpn/1n2p3/8/1P2PP2/N1P1PP1R/2KRqN2
Reprints: feenschach 153 10-12/2003
Input: Gerd Wilts, 2002-10-05
Last update: Reto, 2023-05-10 more...

39 - P1004214
Gianni Donati
R0100c StrateGems 20 10-12/2002
5.-7. Preis ex aequo

(11+15) C+
BP in 22,5

1. Sf3 e5 2. Sd4 exd4 3. Sc3 dxc3 4. dxc3 g6 5. Le3 Lh6 6. Lb6 axb6 7. Dd4 Ta5 8. Td1 Lc1 9. Td3 Tg5 10. Tf3 d5 11. Tf6 Lg4 12. Td6 Lxe2 13. Td7 La6 14. Lb5 h5 15. Lc6 Sxc6 16. a4 Db8 17. Te7+ Kd8 18. Te4 h4 19. De5 h3 20. Tb4 Th4 21. Tb3 Sb4 22. Ta3 c6 23. Ta1
play all

wTa1 wandert nach d7 zum Schachschutz für den wLf1. 12zügier Rundlauf des wTa1.

Moldenhauer: Computerprüfung: C+ Stelvio 1.0 5 Sekunden.
Keine Lösung: BP 21.5, BP 22.0. (2023-02-18)
more ...
comment

Keywords: Unique Proof Game, Pure Round Trip (T), Check Protection
Genre: Retro
Computer test: Stelvio 1.0
FEN: 1q1k2n1/1p3p2/bpp3p1/3pQ1r1/Pn5r/2P4p/1PP2PPP/R1b1K2R
Reprints: feenschach 153 10-12/2003
Input: Gerd Wilts, 2002-10-05
Last update: Silvio Baier, 2023-03-02 more...

40 - P1004372
Dan Meinking
Kostas Prentos
P0118 StrateGems 21 01-03/2003
Spezialpreis

(11+13) C+
BP in 17,5

1. h4 b6 2. h5 La6 3. h6 Ld3 4. hxg7 h5 5. gxf8=S Th7 6. Se6 fxe6 7. Sc3 Kf7 8. Sd5 exd5 9. Th4 Ke6 10. Tc4 dxc4 11. c3 Kd5 12. Db3 cxb3 13. a3 Kc4 14. Ta2 bxa2 15. exd3 Kb3 16. Le2 a1=L 17. Ld1 Ka2 18. b3
play all

Der schwarze K verfolgt den sBf7.

Kostas Prentos: This version is cooked: 1. h4 g5 2. hxg5 b6 3. Th5 La6 4. b3 Ld3 5. exd3 Lg7 6. Df3 Lxa1 7. Dxf7+ Kxf7 8. Le2 Ke6 9. Ld1 Kd5 10. Lb2 Kc5 11. Ld4 Kb4 12. Sc3 Ka3 13. g6 Kb2 14. a3 hxg6 15. Sa2+ Kxa2 16. Lb2 Th7 17. Lc1 gxh5 18. c3

A correction was published in StrateGems, 2018 (No.82/Pg.92, P0118v): PG 17,5:
1. h4 b6 2. h5 Lb7 3. h6 Lf3 4. hxg7 Sc6 5. gxf8=S Tb8 6. Se6 fxe6 7. Th5 Kf7 8. Td5 exd5 9. exf3 Ke6 10. Lc4 dxc4 11. c3 Kd5 12. Db3 cxb3 13. a3 Kc4 14. Ta2 bxa2 15. Ke2 Kb3 16. Kd3 a1=L 17. Se2 Ka2 18. b3 (C+) (2022-12-08)
more ...
comment

Keywords: Unique Proof Game
Genre: Retro
Computer test: Natch 3.1
FEN: rn1q2n1/p1ppp2r/1p6/7p/8/PPPP4/k2P1PP1/b1BBK1N1
Reprints: feenschach 153 10-12/2003
Input: Gerd Wilts, 2003-01-02
Last update: James Malcom, 2020-11-14 more...

41 - P1004457
Michel Caillaud
837 Orbit 15 07/2002
2. Preis

(15+14) C+
BP in 14,0

1. d4 Sc6 2. Kd2 Se5 3. Ke3 Sf3 4. Sd2 Sxg1 5. f3 c6 6. Kf2 Db6 7. Ke1 Db3 8. axb3 f5 9. Ta5 f4 10. Tf5 d6 11. Txf8+ Kd7 12. Td8+ Ke6 13. Td7 Kf7 14. Tc7 Ke8
play all

Rundlauf der beide KK.

Vladimir Rey: Correct: 6. Kf2 Db6 (2022-07-27)
comment

Keywords: Unique Proof Game, Pure Round Trip (Kk)
Genre: Retro
Computer test: Resolution time : 1 mn 13.30 s., Natch 2.3 Copyright (C) 1997,98,99,2001,2002,2003,2004 Pascal Wassong
FEN: r1b1k1nr/ppR1p1pp/2pp4/8/3P1p2/1P3P2/1PPNP1PP/2BQKBnR
Reprints: feenschach 153 10-12/2003
Input: Gerd Wilts, 2003-02-01
Last update: Mario Richter, 2022-07-27 more...

42 - P1007296
Reto Aschwanden
11787 Die Schwalbe 199 02/2003
3. Preis

(13+14) C+
BP in 19,0

1. d4 h5 2. d5 h4 3. d6 Th5 4. dxc7 d5 5. c4 Dd7 6. c5 Dh3 7. c6 Lg4 8. c8=L Sh6 9. Ld7+ Sxd7 10. c7 Sf6 11. c8=L Sh7 12. Lf5 Txf5 13. e4 0-0-0 14. e5 Td6 15. e6 Ta6 16. exf7 e5 17. b3 La3 18. f8=L Lb2 19. La3 Txa3
play all

Drei wUW-LL werden geschlagen, hier aber nicht durch Bauern!

Henrik Juel: Natch 3.1 found the solution but did not finish testing in more than an hour (2018-12-18)
Henrik Juel: Stelvio 2.0 is slightly faster than Stelvio 1.14: 55 sec. (2024-02-04)
comment

Keywords: Ceriani-Frolkin Theme (LLL), Unique Proof Game, Prentos Theme (LLL), Promotion (LLL)
Genre: Retro
Computer test: Natch 3.3: 47min, Euclide 1.11: 30min, Stelvio 1.14: 1min20sec.
FEN: 2k5/pp4pn/7n/3ppr2/6bp/rP5q/Pb3PPP/RNBQKBNR
Reprints: feenschach 155 2004
H1-5 WCCI 2001-2004
11787 Die Schwalbe 211, p. 16, 02/2005
Input: Gerd Wilts, 2003-03-23
Last update: Reto, 2023-03-22 more...

43 - P1009501
Gerd Wilts
11986 Die Schwalbe 202 08/2003
Thierry Le Gleuher gewidmet
4. Preis

(12+13) C+
BP in 16,0

1. b4 h5 2. b5 Th6 3. b6 Tg6 4. bxa7 Txg2 5. axb8=S Txg1 6. Sxd7 Txh1 7. Se5 Lg4 8. Sf3 e6 9. Sg1 Lc5 10. Lh3 Ld4 11. Kf1 c5 12. Kg2 Dc7 13. Sf3 0-0-0 14. Se5 Kb8 15. Sd7+ Ka7 16. Sb8 Txb8
play all

paul: Tested by Euclide 1.11 (2020-02-26)
Henrik Juel: wPa2 promotes on b8 to S, which goes to g1 to screen and then back to b8, where it is captured
Besides CF and Pronkin, also Donati theme (away from and back to b8) (2020-02-26)
paul: Stelvio 2.0 solve it in few seconds. (2024-04-08)
comment

Keywords: Ceriani-Frolkin Theme (S), Unique Proof Game, Pronkin Theme (S)
Genre: Retro
FEN: 1r4n1/kpq2pp1/4p3/2p4p/3b2b1/7B/P1PPPPKP/RNBQ3r
Reprints: feenschach 155 2004
Input: Gerd Wilts, 2003-08-29
Last update: Gerd Wilts, 2005-05-14 more...

44 - P1011755
Gerd Wilts
FIDE Tagung 08/2003
1. - 3. Preis

(12+13) C+
BP in 19,0

1. a4 h5 2. Ta3 Th6 3. Tg3 Tc6 4. Tg6 fxg6 5. a5 Kf7 6. a6 Kf6 7. axb7 Sa6 8. b8=D Kg5 9. Db3 Sf6 10. De6 dxe6 11. Sc3 Dd3 12. cxd3 Ld7 13. Db3 Le8 14. Db8 Lf7 15. Dxf8 Td8 16. Sa2 Td7 17. Db8 Se8 18. Db3 Txc1 19. Dd1 Txd1
play all

TT: proof game with capture of Anti-Pronkin piece
paul: Stelvio 2.0 found the solution in few seconds. (2024-04-08)
comment

Keywords: Anti-Pronkin (D), Unique Proof Game
Genre: Retro
Computer test: (Natch 2.2 Copyright (C) 1997,98,99,2001,2002,2003 Pascal Wassong)
FEN: 4n3/p1prpbp1/n3p1p1/6kp/8/3P4/NP1PPPPP/3rKBNR
Reprints: feenschach 154 2004
idee & form 81 01/2004
Input: Gerd Wilts, 2003-09-28
Last update: Gerd Wilts, 2005-05-21 more...

45 - P1011792
Gerd Wilts
12046 Die Schwalbe 203 10/2003
Michel Caillaud gewidmet
1. Preis

(13+16) C+
BP in 23,5

1. b4 d6 2. Lb2 Kd7 3. Ld4 Ke6 4. Lb6 axb6 5. Sc3 Ta3 6. Se4 Th3 7. a4 Ke5 8. Ta3 Le6 9. Tf3 Sd7 10. Tf6 gxf6 11. a5 Lh6 12. a6 Le3 13. a7 Sh6 14. a8=T Te8 15. Ta1 Da8 16. g4 Da2 17. g5 Db1 18. Ta5+ bxa5 19. g6 Sb6 20. g7 Sa8 21. g8=T Lb6 22. Tg3 Sg8 23. Ta3 Lb3 24. Ta1
play all

Henrik Juel: C+ Stelvio 2.0, 19 seconds
No shorter solutions (2024-01-21)
Henrik Juel: Euclide 1.01 did not even find the solution in 10 minutes (2024-01-21)
Henrik Juel: ditto in some 6 hours, so Stelvio is the clear winner here (2024-01-21)
comment

Keywords: Unique Proof Game, Pronkin Theme (TT)
Genre: Retro
Computer test: Euclide 0.99
FEN: n3r1n1/1pp1pp1p/1b1p1p2/p3k3/1P2N3/1b5r/2PPPP1P/Rq1QKBNR
Reprints: feenschach 155 2004
(A) Die Schwalbe 233 10/2008
H68 FIDE Album 2001-2003 2011
mpk-Blätter 02/2012
Input: Gerd Wilts, 2003-10-19
Last update: Silvio Baier, 2012-04-10 more...

46 - P1017456
Andrey Frolkin
Kostas Prentos
feenschach 154 2004
2. Preis Retro-Kompositionsturnier

(13+14) C+
BP in 27,5

1. f4 e5 2. f5 e4 3. f6 e3 4. fxg7 exd2 5. Kf2 a5 6. e4 a4 7. e5 a3 8. e6 axb2 9. Sa3 b1=T 10. e7 Tb6 11. Tb1 d5 12. Tb5 d4 13. Lb2 d3 14. Da1 dxc2 15. Ld3 c1=T 16. Se2 Tb1 17. Tc1 d1=T 18. Tc4 Tdc1 19. Lc2 Dd1 20. Ke3 Dh1 21. Kd4 Td6+ 22. Kc5 c6 23. Kb6 Lh3 24. Kxb7 Kd7 25. e8=T Se7 26. g8=T Lh6 27. Tg7 Tdd1 28. Teg8
play all

Zyklischer Platzwechsel der sUWTTb1, c1, d1

Kostas Prentos: C+ Natch 3.3 (13 h 17 min 58 sec) (2022-12-08)
more ...
comment

Keywords: Unique Proof Game, Interchange
Genre: Retro
Computer test: KP: C+ Stelvio 1.0 tested this one in 1 min 46 sec.
FEN: rn4Rr/1K1knpRp/2p4b/1R6/2R5/N6b/PBB1N1PP/Qrrr3q
Reprints: Messigny 05/2004
Input: Gerd Wilts, 2004-06-03
Last update: A.Buchanan, 2023-03-20 more...

47 - P1017522
Michel Caillaud
Dirk Borst
feenschach 154 2004
1. Platz

(14+15)
BP in 11,5
AntiSuperCirce (Cheylan)

1. d4 c5 2. Lf4 Sc6 3. Lb8 d6 4. Dd3 Lg4 5. Dg6 hxg6[+wDd3] 6. Sa3 g5 7. 0-0-0 Da5 8. Sf3 De1 9. Sd2 Dxf1[Db1]+ 10. Kxb1[+wKe1] Lh6 11. Sdb1 Lc1 12. 0-0
play all

Richter: Beide weiße Rochaden! (Falscher Springer auf b1.)

paul: The solution is actually: 1.d4 c5 2.Bf4 Sc6 3.Bb8 d6 4.Qd3 Bg4 5.Qg6 hxg6 [bPg6-d7] 6.Sa3 g6 7.O-O-O Qa5 8.Sf3 Qe1 9.Sd2 Qxf1 [bQf1-b1]+ 10.Kxb1 [wKb1-e1] Bh6 11.Sdb1 Bc1 12.O-O (2021-11-30)
comment

Keywords: Circe (AntiSuper-), Unique Proof Game
Genre: Retro, Fairies
FEN: rB2k1nr/pp1ppp2/2np2p1/2p5/3P2b1/N7/PPP1PPPP/1NbR1RK1
Reprints: Andernach TT 2004
Input: Gerd Wilts, 2004-06-05
Last update: A.Buchanan, 2021-01-13 more...

48 - P1017525
Dirk Borst
feenschach 154 2004
4. Platz

(12+14)
BP in 8,5
AntiSuperCirce (Cheylan)

1. e4 h5 2. Lb5 Th6 3. Se2 Ta6 4. 0-0! Txa2 [Te1] 5. Ta6 Txd1 [Te1] 6. Td6 Txc1 [Th1]+ 7. Kxh1 [Kc1] exd6 [Bf6] 8. Td1 La3 9. Sxa3 [Sa2]
Falsche Rochade.
play all

paul: Cooked: 5…T×d1(Ta1) 6.Td6 e×d6(f6) 7.Td1 La3 8.S×a3(Sa2) T×c1(Th1)+ 9.K×h1(Kc1) (2021-12-01)
comment

Keywords: Circe (AntiSuper-), Unique Proof Game
Genre: Fairies, Retro
FEN: rnbqk1n1/pppp1pp1/5p2/1B5p/4P3/8/NPPPNPPP/2KR4
Reprints: Andernach TT 2004
Input: Gerd Wilts, 2004-06-05
Last update: A.Buchanan, 2015-02-25 more...

49 - P1017682
Unto Heinonen
Springaren 1997
3. Preis

(14+16) cooked
BP in 26,0

1. b4 Sh6 2. Lb2 Tg8 3. Lf6 gxf6 4. Sc3 Tg3 5. Tb1 Th3 6. g4 Sa6 7. Lg2 Tb8 8. Lc6 bxc6 9. g5 Tb5 10. g6 Tbh5 11. b5 Sg4 12. b6 Lh6 13. Tb5 Sb4 14. Tg5 La6 15. b7 Lb5 16. b8=L a6 17. La7 Da8 18. Le3 c5 19. g7 Dg2 20. g8=L Sc6 21. Tg7 Lg5 22. Sf3 h6 23. Lh7 Sb8 24. Le4 f5 25. Lb7 Sf6 26. Sd5 Sg8
play all

Cook: 1. Sb1-c3 b7-b6 2. Ta1-b1 Lc8-a6 3. b2-b4 La6-d3 4. b4-b5 Dd8-c8
5. Tb1-b4 Sb8-a6 6. Tb4-c4 Ta8-b8 7. Tc4-c5 b6xc5 8. Lc1-b2 Tb8-b6
9. g2-g4 Tb6-h6 10. b5-b6 Th6-h3 11. b6-b7 Sg8-h6 12. b7-b8=T Th8-g8
13. Tb8-b6 Sa6-b8 14. Lf1-g2 Dc8-a6 15. Tb6-f6 g7xf6 16. Lg2-b7 Tg8-g5
17. Sc3-d5 Tg5-h5 18. g4-g5 Ld3-b5 19. g5-g6 f6-f5 20. g6-g7 Da6-g6
21. Lb2-d4 Dg6-g2 22. g7-g8=T a7-a6 23. Tg8-g3 Sh6-g8 24. Ld4-e3 Lf8-h6
25. Tg3-g7 Lh6-g5 26. Sg1-f3 h7-h6

paul: First 22.5 moves tested with Euclide 1.11 (~11h) (2017-12-29)
Henrik Juel: Now things are OK, I think
Earlier the solution given was for a BP in 19, starting 1.b4 c5 (2017-12-29)
Olaf Jenkner: Yes, I overlooked the date of the first comment. I would not have asked. (2017-12-29)
more ...
comment

Keywords: Unique Proof Game, Pure Round Trip
Genre: Retro
Computer test: Reto: Cooked by Stelvio 1.11
FEN: 1n2k1n1/1BppppR1/p6p/1bpN1pbr/8/4BN1r/P1PPPPqP/3QK2R
Reprints: feenschach 153, p. 191, 10-12/2003
H16 FIDE Album Annexe 1995-1997 2004
Input: Gerd Wilts, 2004-08-06
Last update: Mario Richter, 2023-04-01 more...

50 - P1066780
Michel Caillaud
3755 Phénix 98 01/2001
1. Preis

(16+12) cooked
BP in 21,5

1. b4 g5 2. b5 g4 3. b6 g3 4. bxc7 b5 5. c4 Lb7 6. Sc3 Lf3 7. gxf3 b4 8. Lh3 b3 9. Lf5 b2 10. Lc2 b1=S 11. d3 Sd2 12. Sh3 Sf1 13. Dd2 g2 14. Dh6 g1=D 15. Ld2 Dg5 16. Tc1 Se3 17. Lb1 Sg4 18. 0-0 Df4 19. Tfd1 Se3 20. Le1 Sf1 21. Kxf1 Dd2 22. Txd2
play all

Zuerst schirmt der schwarze UWS auf f1 die schwarze UWD auf g1 ab, anschließend schirmt der Springer die Dame auf g4 ab, und schließlich werden beide geschlagen.
Cook: 1. b4 Sf6 2. c4 b6 3. Sc3 c5 4. bxc5 Lb7 5. cxb6 Lf3 6. gxf3 Sd5 7. Lh3 Se3 8. Lf5 Sf1 9. Lc2 g5 10. Sh3 g4 11. d3 g3 12. Dd2 g2 13. Dh6 g1=D 14. Ld2 Dg3 15. Tc1 Se3 16. Lb1 Dgc7 17. bxc7 Sd1 18. 0-0 Se3 19. Tfd1 Sd5 20. Kf1 Sf6 21. Le1 Sg8 22. Td2

Henrik Juel: Natch 3.1 did not even find the solution in an hour (2018-12-15)
Moldenhauer: Computerprüfung: Cooked Stelvio 1.2 296:36:23 Stunden. (hh:mm:ss)
Keine Lösung BP 20.5, BP 21.0. Histogramm 355767/10739k
Cooked bei 59917/922k. Die letzten 295850 Strategien wären sicher
schneller geprüft worden da die meisten großen Werte bereits waren.
Notations Beispiel: 1.b4 Sf6 2.c4 b6 3.Sc3 c5 4.bxc5 Lb7 5.cxb6 Lf3
6.gxf3 Sd5 7.Lh3 Se3 8.Lf5 Sf1 9.Lc2 g5 10.Sh3 g4 11.d3 g3 12.Dd2 g2
13.Dh6 g1D 14.Ld2 Dg3 15.Tc1 Se3 16.Lb1 Dgc7 17.bxc7 Sd1 18.0–0 Se3
19.Tfd1 Sd5 20.Kf1 Sf6 21.Le1 Sg8 22.Td2
oder wie vor bis 19. dann 20.Le1 Sf6 21.Kf1 Sg8 22.Td2 (2023-05-24)
comment

Keywords: Ceriani-Frolkin Theme (ds), Unique Proof Game, Castling, Promotion (sd), Homebase
Genre: Retro
FEN: rn1qkbnr/p1Pppp1p/7Q/8/2P5/2NP1P1N/P2RPP1P/1BR1BK2
Reprints: feenschach 161 09-11/2005
Input: Gerd Wilts, 2004-10-03
Last update: Silvio Baier, 2023-08-15 more...

51 - P1066801
Rustam Ubaidullajew
R074 Problem Paradise 10-12/2002
3. Preis

(14+16) C+
BP in 27,5

1. g4 d5 2. g5 Lg4 3. Lg2 f5 4. Le4 Kf7 5. Ld3 Kg6 6. Lb5 Kh5 7. Le8+ Kh4 8. Lh5 g6 9. Kf1 Lg7 10. Kg2 Le5 11. Df1 Lg3 12. f4 Sf6 13. Df3 Dg8 14. De4 dxe4 15. Sh3 Dc4 16. Tf1 Td8 17. Tf3 Se8 18. Ta3 Td3 19. Sc3 Tf3 20. Sd5 Tf1 21. Sf6 Txc1 22. Sg8 Th1 23. Tf1 Sd7 24. Tff3 Sb6 25. Tfb3 Sc8 26. e3 Ld1 27. Le2 b6 28. Lf1
play all

Henrik Juel: Natch 3.1 did hardly anything in almost an hour (2018-12-17)
Henrik Juel: Same after 4 hours (2018-12-17)
Moldenhauer: Computerprüfung: C+ Stelvio 1.11 120:10:08 Stunden. (hhh:mm:ss)
Keine Lösung: BP 26.5, BP 27.0. (2023-04-06)
Henrik Juel: Thanks, Moldenhauer
Your computer is very patient...
120 hours = 5 days! (2023-04-06)
comment

Keywords: Unique Proof Game, Pure Round Trip (L)
Genre: Retro
Computer test: Stelvio 1.2, 7:40h. The reduction in time is due to the fact that I had a lot of RAM at hand, which is very useful for this problem. There are only 8 strategies, but they take long to play.
FEN: r1n1n1N1/p1p1p2p/1p4p1/5pP1/2q1pP1k/RR2P1bN/PPPP2KP/3b1B1r
Reprints: feenschach 153 10-12/2003
Input: Gerd Wilts, 2004-10-17
Last update: Reto, 2023-05-13 more...

52 - P1067230
Rustam Ubaidullajew
1233 Orbit 21 01/2004
1. Preis

(14+15) C+
BP in 25,5

1. g3 g5 2. Lh3 Lg7 3. Lxd7+ Kxd7 4. Kf1 Ke6 5. Kg2 Kf5 6. Kf3 Le6 7. Ke3 Kg4 8. Sf3 Kh3 9. Sg1 Kg2 10. Df1+ Kxf1 11. Kf3 Ke1 12. Kg2 Kd1 13. Kf1 Ld4 14. Sf3 Lb6 15. Se1 c5 16. Kg2 Sc6 17. Kf3 Dd5+ 18. Ke3 Td8 19. Tg1 Dh1 20. Tg2 Lc8 21. Sf3 De1 22. Tg1 Td7 23. Th1 Sd8 24. Sg1 c4+ 25. Kf3 g4+ 26. Kg2
play all

Henrik Juel: Natch 3.1 did nothing in 3 hours (2018-12-20)
Henrik Juel: So difficult, and yet so simple
Count the black moves... (2018-12-20)
Moldenhauer: Computerprüfung: C+ Stelvio 1.0 06:31:34 Stunden.
Keine Lösung: BP 24.5, BP 25.0. (2023-02-15)
comment

Keywords: Unique Proof Game, Promenade (K), Switchback (S)
Genre: Retro
Computer test: Stelvio 1.0
FEN: 2bn2nr/pp1rpp1p/1b6/8/2p3p1/6P1/PPPPPPKP/RNBkq1NR
Reprints: feenschach 155, p. 292, Herb/2004
Input: Gerd Wilts, 2004-11-28
Last update: Silvio Baier, 2023-03-02 more...

53 - P1067393
Ulrich Ring
Joost de Heer
5674v feenschach 150 01-03/2004

(13+15) C+
BP in 23,5

1. e4 h5 2. Dg4 hxg4 3. d4 Th3 4. d5 Tc3 5. Le3 b5 6. Lb6 axb6 7. h4 Ta4 8. h5 La6 9. h6 Dc8 10. h7 Db7 11. Th6 Da7 12. Tc6 dxc6 13. e5 Kd7 14. e6 Kd6 15. exf7 e5 16. h8=T e4 17. Th1 Ke5 18. d6 g6 19. d7 Lb4 20. d8=D La5 21. Dd1 Td4 22. f8=L b4 23. Lh6 Lb5 24. Lc1
play all

Silvio Baier: C+ (Natch 2.4) (2009-07-15)
Henrik Juel: and no solution in 23.0 moves (Stelvio 1.4) (2023-08-18)
comment

Keywords: Unique Proof Game, Homebase (w), Pronkin Theme (DTL)
Genre: Retro
Computer test: Natch 2.4
FEN: 1n4n1/q1p5/1pp3p1/bb2k3/1p1rp1p1/2r5/PPP2PP1/RNBQKBNR
Input: Gerd Wilts, 2005-01-09
Last update: A.Buchanan, 2013-01-23 more...

54 - P1067404
Reto Aschwanden
8967 feenschach 152 07-09/2003

(11+15) C+
BP in 20,5

1. e3 h5 2. La6 bxa6 3. f4 Lb7 4. f5 Ld5 5. f6 Sc6 6. fxg7 f5 7. g4 Sf6 8. g8=D Tc8 9. De6 Lh6 10. Dd6 cxd6 11. g5 Da5 12. g6 Sd8 13. g7 Tc3 14. g8=L Lc4 15. Ld5 Da4 16. Lg2 0-0 17. Dg4 Kh8 18. Dg8 Txg8 19. Lf1 Txg1 20. d3 Txf1 21. Kd2
play all

Schlag der Pronkin- und Antipronkin-Themafigur.

Moldenhauer: Computerprüfung: C+ Stelvio 1.0 00:01:15 (hh:mm:ss).
Keine Lösung: BP 19.5, BP 20.0. (2023-03-01)
comment

Keywords: Anti-Pronkin (D), Unique Proof Game, Pronkin Theme (L)
Genre: Retro
Computer test: Solving time: Natch 3.3: 3:58h , Euclide 1.11: >10h, Stelvio 1.15: 1:40min
FEN: 3n3k/p2pp3/p2p1n1b/5p1p/q1b5/2rPP3/PPPK3P/RNB2r1R
Input: Gerd Wilts, 2005-01-09
Last update: Reto, 2023-03-29 more...

55 - P1067417
Unto Heinonen
Springaren 87, p. 184-190, 12/2001
1. Preis Springaren Summer Tourney 2001

(16+16)
BP in 23,0

1. e4 Sc6 2. Le2 Se5 3. Lh5 Sg6 4. Ke2 f5 5. Kf3 f4 6. Kg4 a5 7. Sf3 Ta6 8. Te1 Tc6 9. Te3 b6 10. Td3 La6 11. Td6 Le2 12. Tf6 e6 13. d3 La3 14. b4 Tc3 15. Lb2 Tb3 16. Le5 S8e7 17. Sc3 Tb1 18. Dd2 Tf1 19. Te1 Ld1 20. Te2 Sc6 21. Sg5 Sb8 22. Sf7 Se7 23. Dc1 Sg8
play all

Judge: Kjell Widlert
more ...
comment

Keywords: Unique Proof Game, Interchange (ss), Capture-free
Genre: Retro
FEN: 1n1qk1nr/2pp1Npp/1p2pR2/p3B2B/1P2PpK1/b1NP4/P1P1RPPP/2Qb1r2
Reprints: feenschach 153 10-12/2003
H64 FIDE Album 2001-2003 2011
Input: Gerd Wilts, 2005-01-09
Last update: A.Buchanan, 2021-05-08 more...

56 - P1067420
Michel Caillaud
StrateGems 2001
1. Preis

(12+16) C+
BP in 22,5

1. c4 h5 2. c5 Th6 3. c6 Txc6 4. a4 Txc1 5. Ta3 c5 6. Tc3 Da5 7. Sa3 Ta1 8. Tc1 Dc3 9. f4 a5 10. f5 Ta6 11. f6 Txf6 12. Sh3 b6 13. Sf4 La6 14. Kf2 Ld3 15. Ke3 Ta2 16. Sd5 Txf1 17. h4 f5 18. Th3 Th1 19. Tf3 Th2 20. Tf1 f4+ 21. Kf2 f3 22. Ta1 Lb1 23. Th1
play all

Rundlauf der beiden wTT.

Henrik Juel: Natch 3.1 made no progress after an hour (2018-12-15)
Moldenhauer: Computerprüfung: C+ Stelvio 1.0 3 Sekunden.
Keine Lösung: BP 21.5, BP 22.0. (2023-02-18)
comment

Keywords: Unique Proof Game, Pure Round Trip (TT)
Genre: Retro
Computer test: Stelvio 1.0
FEN: 1n2kbn1/3pp1p1/1p6/p1pN3p/P6P/N1q2p2/rP1PPKPr/Rb1Q3R
Reprints: feenschach 153, p. 201, 10-12/2003
Input: Gerd Wilts, 2005-01-09
Last update: Silvio Baier, 2023-03-02 more...

57 - P1067422
Olli Heimo
Suomen Tehtäväniekat 2001
Joose Norri gewidmet
1. Preis

(11+12) C+
BP in 25,5

1. e4 b5 2. e5 Lb7 3. e6 Lf3 4. gxf3 Sf6 5. Lg2 Se4 6. fxe4 a5 7. e5 Ta6 8. La8 b4 9. Sf3 b3 10. Tg1 bxc2 11. Tg6 cxb1=L 12. Th6 Le4 13. d3 a4 14. dxe4 a3 15. Dd6 axb2 16. a4 bxc1=L 17. a5 Le3 18. fxe3 exd6 19. 0-0-0 Le7 20. Tf1 0-0 21. Se1 Te8 22. Tff6 Lf8 23. e7 Sc6 24. e6 Sa7 25. e5 c6 26. e4
play all

Olli Heimo: Hi! Has anybody a strong enough computer for testing? In 2001 I tested the first 22,5 moves, it took 20 hours, but it does not prove anything. My current computer can check up to 23 moves in a reasonable time. Olli. (2015-02-25)
Henrik Juel: I am afraid that I cannot help you, Olli.
The keyword Albino looks strange in a proof game (2015-02-25)
Olli Heimo: This problem shows four different white pawns moves to e4. Perhaps Albino is a wrong term. In principle it could be possible to have five pawns reaching same square on fourth row, but I believe that it can not be done in a sound proofgame. (2015-02-26)
Moldenhauer: Computerprüfung: C+ Stelvio 1.0 12:07:15 Stunden.
Keine Lösung: BP 24.5, BP 25.0. (2023-02-17)
comment

Keywords: Unique Proof Game
Genre: Retro
Computer test: Stelvio 1.0
FEN: B2qrbk1/n2pPppp/r1ppPR1R/P3P3/4P3/8/7P/2K1N3
Reprints: feenschach 153 10-12/2003
Input: Gerd Wilts, 2005-01-09
Last update: Silvio Baier, 2023-03-03 more...

58 - P1067433
Rustam Ubaidullajew
The Ural's Problemist 2003
3. Preis

(16+15) C+
BP in 20,5

1. d3 c6 2. Ld2 Db6 3. La5 Db3 4. axb3 Sf6 5. Ta4 Sd5 6. Th4 Sb6 7. e4 Kd8 8. Ke2 Kc7 9. Kf3 Kd6 10. Kg3 Ke5 11. Dh5+ Ke6 12. Le2 Kd6 13. Dd5+ Kc7 14. Lh5 Kd8 15. Sf3 Ke8 16. Te1 Sc4 17. Te3 Se5 18. Se1 Sg4 19. Tf3 Sh6 20. Tf6 Sg8 21. f3
play all

Rundläufe von sK und sSg8, um ein Tempo zu verlieren.

more ...
comment

Keywords: Unique Proof Game, Pure Round Trip (sk), Tempo Loss (k9)
Genre: Retro
Computer test: Computerprüfung: C+ Stelvio 1.0 00:46:34 Minuten (hh:mm:ss). Keine Lösung: BP 19.5, BP 20.0.
FEN: rnb1kbnr/pp1ppppp/2p2R2/B2Q3B/4P2R/1P1P1PK1/1PP3PP/1N2N3
Reprints: feenschach 153 10-12/2003
Input: Gerd Wilts, 2005-01-09
Last update: A.Buchanan, 2023-03-02 more...

59 - P1067438
Michel Caillaud
WCCC Halkidiki 2004
2. Preis Sake TT

(20+12)
BP in 15,0
Crazyhouse

1. b4 a5 2. bxa5 Txa5 3. [+wBa7] Te5 4. a8=L d5 5. Lxb7 Kd7 6. [+wBa7] Ke6 7. a8=S Kf5 8. Sxc7 Le6 9. [+wBd7] Dc8 10. d8=T g6 11. Txd5 Lg7 12. [+wBd7] Lf6 13. d8=D Sd7 14. Dxe7 Sf8 15. [+wBb2] [+sBd7]
play all

James Malcom: I wonder if the newly placed wBb2 and sBd7 could be considered as imposters. (2021-06-27)
A.Buchanan: I think they are. This is not so hard a problem to solve. (2021-06-28)
more ...
comment

Keywords: Allumwandlung, Crazyhouse, Unique Proof Game, Promotion (x4 LSTD), Non-standard material (DTLS), Impostor (Bb)
Genre: Retro, Fairies
FEN: 2q2nnr/1BNpQp1p/4bbp1/3Rrk2/8/8/PPPPPPPP/RNBQKBNR
Reprints: feenschach 154 2004
H46 Phénix 02-03/2005
Input: Gerd Wilts, 2005-01-09
Last update: A.Buchanan, 2021-06-28 more...

60 - P1067873
Roberto Osorio
Jorge Joaquin Lois
StrateGems 2004
5. Preis

(15+13) C+
BP in 22,5

1. b3 g6 2. La3 Lg7 3. Ld6 Lc3 4. Lxc7 Sf6 5. Lxb8 Da5 6. h4 Da3 7. Lh2 a5 8. g3 Ta6 9. Lg2 Te6 10. Kf1 Te3 11. dxe3 d6 12. Dd3 Kd7 13. Da6 bxa6 14. La8 Lb7 15. Sf3 Tc8 16. Lg1 Tc4 17. Sh2 Tg4 18. f4 Kc6 19. Lf2 Kc5 20. Le1 Lf3 21. Ld2 Se4 22. Lc1 Sd2+ 23. Kg1
play all

paul: wBc1 circuit (2020-11-29)
more ...
comment

Keywords: Unique Proof Game
Genre: Retro
Computer test: Natch 3.1 (3 min.)
FEN: B7/4pp1p/p2p2p1/p1k5/5PrP/qPb1PbP1/P1PnP2N/RNB3KR
Reprints: feenschach 155, p. 296, Herb/2004
Input: Gerd Wilts, 2005-05-14
Last update: Alfred Pfeiffer, 2018-12-21 more...

61 - P1095829
Joost de Heer
Andernach TT 05/2007
4. Platz

(16+15) C+
BP in 10.5
Masand

1. h4 d6 2. Th3 Lg4 3. Tb3 Kd7 4. Tb6 axb6 5. Sc3 Ta3 6. Sa4 Th3 7. g3 Th1 8. Lh3! Kc6 9. Lg2+ [Th1=w] Kd7 10. Sh3 Ke8 11. 0-0
play all

Rochade mit einem Masand-Turm, verblüffend.

Joost de Heer: C+ Jacobi in 142 hour. (2021-01-24)
comment

Keywords: Unique Proof Game, Masand, Castling
Genre: Retro, Fairies
FEN: 1n1qkbnr/1pp1pppp/1p1p4/8/N5bP/6PN/PPPPPPB1/R1BQ1RK1
Reprints: feenschach 169 09-10/2007
Input: Gerd Wilts, 2009-12-11
Last update: James Malcom, 2021-01-24 more...

62 - P1113793
Per Olin
14580 Die Schwalbe 244 08/2010
Andrej Frolkin gewidmet
5. Lob

(9+16)
BP in 20
Chess960

LLTDKSTS:
1. Shg3 Se6 2. Sf5 Sc5 3. Sh6 gxh6 4. Se3 Tg4 5. Sd5 Tb4 6. Sb6 axb6 7. c4 La7 8. Lg6 fxg6 9. Da4 Sf7 10. Dc6 bxc6 11. b3 Lb7 12. Lf6 exf6 13. Tc3 De7 14. Te3 O-O-O 15. Te6 dxe6 16. O-O Td5 17. Tc1 Th5 18. Tc3 Sg5 19. Td3 Df7 20. Td6 cxd6
play all

Alain Brobecker: bbrqknrn/pppppppp/8/8/8/8/PPPPPPPP/BBRQKNRN

1. Nhg3 Ne6 2. Nf5 Nc5 3. Nh6 gxh6 4. Ne3 Rg4 5. Nd5 Rb4 6. Nb6 axb6 7. c4 Ba7 8. Bg6 fxg6 9. Qa4 Nf7 10. Qc6 bxc6 11. b3 Bb7 12. Bf6 exf6 13. Rc3 Qe7 14. Re3 O-O-O 15. Re6 dxe6 16. O-O Rd5 17. Rc1 Rh5 18. Rc3 Ng5 19. Rd3 Qf7 20. Rd6 cxd6 (2011-03-10)
Moldenhauer: Computerprüfung: C+ Jacobi v0.7.6 beta1 in 1 Std. 30 Min. PG demolition mode. BP19.5 keine Lösung. (2022-08-04)
comment

Keywords: Chess960, Unique Proof Game
Genre: Retro, Fairies
FEN: 2k5/bb3q1p/1ppppppp/2n3nr/1rP5/1P6/P2PPPPP/6K1
Reprints: 960/12 feenschach 189, p. 213, 11/2011
Input: Gerd Wilts, 2010-08-28
Last update: TBr, 2019-02-15 more...

63 - P1268232
Per Olin
64 feenschach 183, p. 381, 24/08/2010
dedicated to Hans Gruber 50

(10+15)
BP in 11.0
Chess960
PAS=TKLTDSSL

1. f3 d6 2. Dh4 Dc6 3. Sg3 Dc3 4. dxc3 Le6 5. Lh6 Lb3 6. Td5 gxh6 7. Tg5 hxg5 8. 0-0-0 gxh4 9. Td2 hxg3 10. Kd1 gxh2 11. g3 hxg1=D#
play all

paul: Jacobi tested the first 9 moves (~1 hour) (2018-01-30)
paul: With another device, I completely checked this (in 24 min) (2021-01-26)
Moldenhauer: Computerprüfung: C+ Jacobi v0.7.6 beta1 in 16 Std. 35 Min. PG demolition mode
exact solutions (1) (2022-08-07)
comment

Keywords: Chess960 (TKLTDSSL), Castling, Phoenix (D), Unique Proof Game
Genre: Retro, Fairies
FEN: rk1r1nnb/ppp1pp1p/3p4/8/8/1bP2PP1/PPPRP3/3K2qB
Reprints: 960/14 feenschach 189, p. 213, 11/2011
Input: Alfred Pfeiffer, 2013-04-23
Last update: A.Buchanan, 2020-12-22 more...

64 - P1382408
Thierry Le Gleuher
Gunter Jordan
Raúl Jordan
Roberto Osorio
15 feenschach 237, p. 224, 09-10/2019

(12+11) C+
BP in 9.5

1. d4 a5 2. d5 a4 3. d6 a3 4. dxc7 axb2 5. cxb8=D bxc1=D 6. Dxc8 Dg5 7. Dc4 Dxg2 8. Dxf7+ Kxf7 9. Lxg2 Ke8 10. Lf1
play all

Silvio-Baier-40-JT: Thema: Gesucht waren eindeutige orthodoxe Beweispartien mit weißer und schwarzer Homebasestellung, wobei auf jeder Seite ein Bauer umwandeln und von einer Figur (keinem Bauern) geschlagen werden sollte und zudem genau ein Stein eine zweizügige Rückkehr vollführt.

A.Buchanan: Can anyone send me the full results of this JT please? I have an unpublished one which is similar in theme, and I want to confirm that I’m not anticipated. I will load all problems into PDB if they’re not already here (2020-11-26)
comment

Keywords: Unique Proof Game, Homebase (2), Prentos Theme (Dd), Switchback (Lk), Ceriani-Frolkin Theme (Dd)
Genre: Retro
FEN: r2qkbnr/1p1pp1pp/8/8/8/8/P1P1PP1P/RN1QKBNR
Input: Gunter Jordan, 2020-11-25
Last update: A.Buchanan, 2021-02-20 more...

65 - P1382804
Silvio Baier
26 feenschach 237, p. 225, 09-10/2019

(9+9) C+
BP in 11.5

1. f4 c5 2. f5 c4 3. f6 c3 4. fxg7 cxb2 5. gxh8=D bxc1=T 6. Dxh7 Txc2 7. Dxg8 Txd2 8. Dg3 Txa2 9. Dxd7+ Sxd7 10. Txa2 Tb8 11. Dxb8 Sxb8 12. Ta1
play all

A.Buchanan: My personal opinion is that excelsior as a keword does not exist for proof games, as all promotions are excelsiors. I don't think under-promotion as a keyword exists for any genres except direct mates & studies. I haven't included promotion yet, but I'm happy to oblige. I also include Ceriani-Frolkin whenever I include Prentos. (2020-12-08)
comment

Keywords: Unique Proof Game, Homebase (2), Prentos Theme (Dt), Switchback (Ts), Promotion (Dt), Ceriani-Frolkin Theme (Dt)
Genre: Retro
FEN: 1nbqkb2/pp2pp2/8/8/8/8/4P1PP/RN2KBNR
Input: Gunter Jordan, 2020-12-08
Last update: A.Buchanan, 2021-02-20 more...

66 - P1384784
Bernd Graefrath
Roberto Osorio
48 feenschach 237, p. 227, 09-10/2019

(11+11) C+
BP in 9,0

1. a4 g5 2. a5 g4 3. a6 g3 4. axb7 gxh2 5. bxc8=D hxg1=S 6. Dxb8 Sxe2 7. Dxa7 Sxc1 8. Dxc1 Txa7 9. Dd1 Ta8
play all

Silvio-Baier-40-JT: Thema: Gesucht waren eindeutige orthodoxe Beweispartien mit weißer und schwarzer Homebasestellung, wobei auf jeder Seite ein Bauer umwandeln und von einer Figur (keinem Bauern) geschlagen werden sollte und zudem genau ein Stein eine zweizügige Rückkehr vollführt.

A.Buchanan: "genau ein Stein eine zweizügige Rückkehr vollführt" I don't understand this: "exactly one piece makes a two-move switchback?" Which piece is this? Structurally both sides seem to be making the same kinds of moves: 7 with the promoter, and then 2 with a capturer (2021-01-01)
more ...
comment

Keywords: Unique Proof Game, Homebase (2), Prentos Theme (Ds), Switchback (Dt), Promotion (Ds), Ceriani-Frolkin Theme (Ds)
Genre: Retro
FEN: r2qkbnr/2pppp1p/8/8/8/8/1PPP1PP1/RN1QKB1R
Input: Gunter Jordan, 2020-12-31
Last update: A.Buchanan, 2021-02-20 more...

67 - P1385721
Silvio Baier
74 feenschach 237, p. 230, 09-10/2019

(10+9) C+
BP in 11.0

1. c4 f5 2. c5 f4 3. c6 f3 4. cxb7 fxg2 5. bxc8=T gxh1=D 6. Txc7 Dxg1 7. Txd7 Dg6 8. Txa7 Dxd2+ 9. Sxd2 Txa7 10. Tb1 Dxb1 11. Sxb1 Ta8
play all

Silvio-Baier-40-JT: Thema: Gesucht waren eindeutige orthodoxe Beweispartien mit weißer und schwarzer Homebasestellung, wobei auf jeder Seite ein Bauer umwandeln und von einer Figur (keinem Bauern) geschlagen werden sollte und zudem genau ein Stein eine zweizügige Rückkehr vollführt.

Henrik Juel: Experiments with Euclide 1.01
First 8.0 moves: C+ in a second
First 8.5 moves: C+ in a minute
First 9.0 moves: no output in 20 minutes (2021-02-21)
Henrik Juel: continued
First 9.0 moves: C+ in 54 minutes
extrapolating crudely, a full testing should last a thousand years... (2021-02-21)
Michel Caillaud: Today, the program to be used for these proofgames with many "invisible" captures is Jacobi.
The full testing with Jacobi 0.7.5 is almost one day (81300s), still much less than a thousand years... (2021-02-23)
A.Buchanan: Both original white rooks are captured after single promotion to rook. Is that double Prenix (2021-02-24)
more ...
comment

Keywords: Unique Proof Game, Homebase (2), Prentos Theme (Td), Switchback (St), Promotion (Td), Ceriani-Frolkin Theme (Td), Prenix (Td)
Genre: Retro
Computer test: C+ Jacobi 0.7.5 81300s
FEN: rn2kbnr/4p1pp/8/8/8/8/PP2PP1P/1NBQKB2
Input: Gunter Jordan, 2021-01-25
Last update: A.Buchanan, 2021-02-24 more...

68 - P1386611
Silvio Baier
Thierry Le Gleuher
Bernd Graefrath
Roberto Osorio
Gregor Werner
98 feenschach 237, p. 232, 09-10/2019

(12+11) C+
BP in 9.0

1. f4 a5 2. f5 a4 3. f6 a3 4. fxg7 axb2 5. gxf8=L bxa1=D 6. Lxe7 Df6 7. Lxd8 Dxf1+ 8. Kxf1 Kxd8 9. Ke1 Ke8
play all

Silvio-Baier-40-JT: Thema: Gesucht waren eindeutige orthodoxe Beweispartien mit weißer und schwarzer Homebasestellung, wobei auf jeder Seite ein Bauer umwandeln und von einer Figur (keinem Bauern) geschlagen werden sollte und zudem genau ein Stein eine zweizügige Rückkehr vollführt.

In der Originalquelle f 237 stand eine falsche Lösung. Die hier angegebene Lösung ist richtig.

A.Buchanan: Under-promotion & excelsior are meaningless for PGs (2021-02-19)
comment

Keywords: Unique Proof Game, Ceriani-Frolkin Theme (Ld), Homebase (2), Prentos Theme (Ld), Switchback (Kk), Promotion (Ld)
Genre: Retro
FEN: rnb1k1nr/1ppp1p1p/8/8/8/8/P1PPP1PP/1NBQK1NR
Input: Gunter Jordan, 2021-02-18
Last update: A.Buchanan, 2021-02-19 more...

69 - P1387696
Silvio Baier
Thierry Le Gleuher
Bernd Graefrath
Ralf Krätschmer
Roberto Osorio
131 feenschach 237, p. 235, 09-10/2019

(11+11) C+
BP in 10.0

1. f4 h5 2. f5 h4 3. f6 h3 4. fxe7 hxg2 5. exd8=L gxh1=S 6. Lxc7 Sxg3 7. Le5 Sxe2 8. Lxg7 Sxc1 9. Dxc1 Lxg7 10. Dd1 Lf8
play all

Silvio-Baier-40-JT: Thema: Gesucht waren eindeutige orthodoxe Beweispartien mit weißer und schwarzer Homebasestellung, wobei auf jeder Seite ein Bauer umwandeln und von einer Figur (keinem Bauern) geschlagen werden sollte und zudem genau ein Stein eine zweizügige Rückkehr vollführt.

Henrik Juel: tiny typo: 6... Sg3, not Sxg3
correcting this should enable the animation (2021-03-22)
comment

Keywords: Unique Proof Game, Homebase (2), Prentos Theme (Ls), Switchback (Dl), Promotion (Ls)
Genre: Retro
FEN: rnb1kbnr/pp1p1p2/8/8/8/8/PPPP3P/RN1QKBN1
Input: Gunter Jordan, 2021-03-22
Last update: A.Buchanan, 2021-04-06 more...

70 - P1387875
Silvio Baier
132 feenschach 237, p. 235, 09-10/2019

(10+11) C+
BP in 10.5

1. f4 g5 2. f5 g4 3. f6 g3 4. fxe7 gxh2 5. exf8=L hxg1=S 6. Ld6 Sxe2 7. Lxc7 Sxc1 8. La6 Sxa6 9. Dxc1 Tb8 10. Lxb8 Sxb8 11. Dd1
play all

Silvio-Baier-40-JT: Thema: Gesucht waren eindeutige orthodoxe Beweispartien mit weißer und schwarzer Homebasestellung, wobei auf jeder Seite ein Bauer umwandeln und von einer Figur (keinem Bauern) geschlagen werden sollte und zudem genau ein Stein eine zweizügige Rückkehr vollführt.

Henrik Juel: Missing stipulation: BP in 10,5 (2021-03-26)
Gunter Jordan: Danke für den Hinweis. Habe ich sogleich eingefügt! (2021-03-27)
comment

Keywords: Unique Proof Game, Homebase (2), Prentos Theme (Ls), Switchback (Ds), Promotion (Ls)
Genre: Retro
FEN: 1nbqk1nr/pp1p1p1p/8/8/8/8/PPPP2P1/RN1QK2R
Input: Gunter Jordan, 2021-03-26
Last update: A.Buchanan, 2021-04-06 more...

71 - P1388631
Silvio Baier
Gunter Jordan
Raúl Jordan
Roberto Osorio
154 feenschach 237, p. 238, 09-10/2019

(11+12) C+
BP in 9.0

1. f4 a5 2. f5 a4 3. f6 a3 4. fxg7 axb2 5. gxf8=S bxc1=D 6. Se6 Dxb1 7. Sxd8 Dxa2 8. Txa2 Kxd8 9. Ta1 Ke8
play all

Silvio-Baier-40-JT: Thema: Gesucht waren eindeutige orthodoxe Beweispartien mit weißer und schwarzer Homebasestellung, wobei auf jeder Seite ein Bauer umwandeln und von einer Figur (keinem Bauern) geschlagen werden sollte und zudem genau ein Stein eine zweizügige Rückkehr vollführt.

A.Buchanan: Excelsior is never a feature for proof games. particularly distinguishing white from black excelsiors is meaningful for d#, s# & possibly h#. Under-promotions are meaningless for proof games, and makes search much harder. More is less for tags. Maybe we can have "theme or derived" feature like in WinChloe in future which would allow these things to be derived, but they should not form part of the core tagging. I am concerned that there is some LaTeX file somewhere where these nonsense tags are effectively being treated as the master data source and could be reinjected to PDB on a whim. (2021-04-16)
A.Buchanan: More positively, please start using the Future PG tag. Here the Prentos, prenix and switchback are doubled features. For homebase, I think one might consider "trapped hole" as a defect: here d8 can only reasonably be captured by a knight, but it's probably not worth being a tag. Here, the doubled prenix including missing wSb1 is an important mitigation. (2021-04-16)
more ...
comment

Keywords: Unique Proof Game, Homebase (2), Prentos Theme (Sd), Switchback (Tk), Promotion (Sd), Ceriani-Frolkin Theme (Sd), Prenix (Sd), Future Proof Game (Prentos+Prenix+Sback)
Genre: Retro
FEN: rnb1k1nr/1ppppp1p/8/8/8/8/2PPP1PP/R2QKBNR
Input: Gunter Jordan, 2021-04-15
Last update: A.Buchanan, 2021-04-16 more...

72 - P1388682
Thierry Le Gleuher
Gunter Jordan
Raúl Jordan
Ralf Krätschmer
Roberto Osorio
155 feenschach 237, p. 238, 09-10/2019

(12+11) C+
BP in 9.0

1. g4 b5 2. g5 b4 3. g6 b3 4. gxh7 bxc2 5. hxg8=S cxb1=D 6. Sxe7 Dg6 7. Sxc8 Dxg1 8. Txg1 Dxc8 9. Th1 Dd8
play all

Silvio-Baier-40-JT: Thema: Gesucht waren eindeutige orthodoxe Beweispartien mit weißer und schwarzer Homebasestellung, wobei auf jeder Seite ein Bauer umwandeln und von einer Figur (keinem Bauern) geschlagen werden sollte und zudem genau ein Stein eine zweizügige Rückkehr vollführt.

more ...
comment

Keywords: Unique Proof Game, Homebase (2), Prentos Theme (Sd), Switchback (Td), Promotion (Sd), Prenix (S), Ceriani-Frolkin Theme (Sd), Future Proof Game (Prentos+Sback)
Genre: Retro
FEN: rn1qkb1r/p1pp1pp1/8/8/8/8/PP1PPP1P/R1BQKB1R
Input: Gunter Jordan, 2021-04-16
Last update: A.Buchanan, 2021-04-17 more...

73 - P1389155
Silvio Baier
Thierry Le Gleuher
Ralf Krätschmer
Roberto Osorio
169 feenschach 237, p. 239, 09-10/2019

(11+10) C+
BP in 9.5

1. b4 f5 2. b5 f4 3. b6 f3 4. bxa7 fxg2 5. axb8=S gxh1=T 6. Sxd7 Txh2 7. Sxf8 Txf2 8. Sxh7 Txh7 9. Kxf2 Th8 10. Ke1
play all

Silvio-Baier-40-JT: Thema: Gesucht waren eindeutige orthodoxe Beweispartien mit weißer und schwarzer Homebasestellung, wobei auf jeder Seite ein Bauer umwandeln und von einer Figur (keinem Bauern) geschlagen werden sollte und zudem genau ein Stein eine zweizügige Rückkehr vollführt.

Moldenhauer: Computerprüfung: C+ Stelvio 1.4 03:05:53 Stunden. (hh:mm:ss)
Keine Lösung: BP 9.0. (2023-07-23)
comment

Keywords: Unique Proof Game, Excelsior black, Excelsior white, Homebase (2), Prentos Theme (St), Switchback (Kt), under-promotion (St)
Genre: Retro
Computer test: Stelvio 1.4
FEN: r1bqk1nr/1pp1p1p1/8/8/8/8/P1PPP3/RNBQKBN1
Input: Gunter Jordan, 2021-05-01
Last update: Silvio Baier, 2023-08-15 more...

74 - P1389187
Thierry Le Gleuher
Ralf Krätschmer
Roberto Osorio
170 feenschach 237, p. 239, 09-10/2019

(11+11) C+
BP in 9.5

1. b4 g5 2. b5 g4 3. b6 g3 4. bxa7 gxh2 5. axb8=S hxg1=T 6. Sc6 Txg2 7. Sxd8 Txf2 8. Sxb7 Lxb7 9. Kxf2 Lc8 10. Ke1
play all

Silvio-Baier-40-JT: Thema: Gesucht waren eindeutige orthodoxe Beweispartien mit weißer und schwarzer Homebasestellung, wobei auf jeder Seite ein Bauer umwandeln und von einer Figur (keinem Bauern) geschlagen werden sollte und zudem genau ein Stein eine zweizügige Rückkehr vollführt.

Moldenhauer: Computerprüfung: C+ Stelvio 1.4 04:00:17 Stunden. (hh:mm:ss)
Keine Lösung: BP 9.0. (2023-07-23)
comment

Keywords: Unique Proof Game, Homebase (2), Prentos Theme (St), Switchback (Kl), under-promotion (St), Ceriani-Frolkin Theme (St), Prenix (S), Future Proof Game (Prentos+Sback)
Genre: Retro
Computer test: Stelvio 1.4
FEN: r1b1kbnr/2pppp1p/8/8/8/8/P1PPP3/RNBQKB1R
Input: Gunter Jordan, 2021-05-02
Last update: Silvio Baier, 2023-08-15 more...

75 - P1389374
Silvio Baier
Thierry Le Gleuher
Gunter Jordan
Raúl Jordan
Ralf Krätschmer
Roberto Osorio
175 feenschach 237, p. 240, 09-10/2019

(11+11) C+
BP in 9.5

1. b4 f5 2. b5 f4 3. b6 f3 4. bxc7 fxg2 5. cxd8=S gxf1=L 6. Se6 Lxe2 7. Sxf8 Lxd1 8. Sxh7 Txh7 9. Kxd1 Th8 10. Ke1
play all

Silvio-Baier-40-JT: Thema: Gesucht waren eindeutige orthodoxe Beweispartien mit weißer und schwarzer Homebasestellung, wobei auf jeder Seite ein Bauer umwandeln und von einer Figur (keinem Bauern) geschlagen werden sollte und zudem genau ein Stein eine zweizügige Rückkehr vollführt.

more ...
comment

Keywords: Unique Proof Game, Excelsior black, Excelsior white, Homebase (2), Prentos Theme (Sl), Switchback (Kt), under-promotion (Sl)
Genre: Retro
Computer test: Computerprüfung: C+ Stelvio 1.4 02:01:02 Stunden.(hh:mm:ss) Keine Lösung: BP 9.0.
FEN: rnb1k1nr/pp1pp1p1/8/8/8/8/P1PP1P1P/RNB1K1NR
Input: Gunter Jordan, 2021-05-07
Last update: A.Buchanan, 2023-07-29 more...

76 - P1389383
Thierry Le Gleuher
Gunter Jordan
Raúl Jordan
Roberto Osorio
176 feenschach 237, p. 240, 09-10/2019

(11+11) C+
BP in 9.5

1. f4 h5 2. f5 h4 3. f6 h3 4. fxg7 hxg2 5. gxf8=S gxf1=L 6. Se6 Lxe2 7. Sxd8 Lxd1 8. Sxb7 Lxb7 9. Kxd1 Lc8 10. Ke1
play all

Silvio-Baier-40-JT: Thema: Gesucht waren eindeutige orthodoxe Beweispartien mit weißer und schwarzer Homebasestellung, wobei auf jeder Seite ein Bauer umwandeln und von einer Figur (keinem Bauern) geschlagen werden sollte und zudem genau ein Stein eine zweizügige Rückkehr vollführt.

more ...
comment

Keywords: Unique Proof Game, Excelsior black, Excelsior white, Homebase (2), Prentos Theme (Sl), Switchback (Kl), under-promotion (Sl)
Genre: Retro
Computer test: Computerprüfung: C+ Stelvio 1.4 04:29:10 Stunden.(hh:mm:ss) Keine Lösung: BP 9.0.
FEN: rnb1k1nr/p1pppp2/8/8/8/8/PPPP3P/RNB1K1NR
Input: Gunter Jordan, 2021-05-08
Last update: A.Buchanan, 2023-07-29 more...

77 - P1389414
Silvio Baier
Thierry Le Gleuher
177 feenschach 237, p. 240, 09-10/2019

(11+11) C+
BP in 11.0

1. h4 g5 2. hxg5 h5 3. g6 h4 4. g7 h3 5. gxf8=S hxg2 6. Se6 gxf1=L 7. Sxd8 Lxe2 8. Sc6 Lxd1 9. Kxd1 Sa6 10. Ke1 Tb8 11. Sxb8 Sxb8
play all

Silvio-Baier-40-JT: Thema: Gesucht waren eindeutige orthodoxe Beweispartien mit weißer und schwarzer Homebasestellung, wobei auf jeder Seite ein Bauer umwandeln und von einer Figur (keinem Bauern) geschlagen werden sollte und zudem genau ein Stein eine zweizügige Rückkehr vollführt.

more ...
comment

Keywords: Unique Proof Game, Excelsior black, Excelsior white, Homebase (2), Prentos Theme (Sl), Switchback (Ks), under-promotion (Sl)
Genre: Retro
Computer test: Computerprüfung: C+ Stelvio 1.4 in 147:48:36 Stunden. (hh:mm:ss) Keine Lösung: BP 10.5 in 39:42:33 Stunden.
FEN: 1nb1k1nr/pppppp2/8/8/8/8/PPPP1P2/RNB1K1NR
Input: Gunter Jordan, 2021-05-09
Last update: A.Buchanan, 2023-08-08 more...

78 - P1389442
Silvio Baier
Thierry Le Gleuher
178 feenschach 237, p. 240, 09-10/2019

(12+12) C+
BP in 9.5

1. g4 f5 2. g5 f4 3. g6 f3 4. gxh7 fxe2 5. hxg8=S exf1=L 6. Sh6 Ld3 7. Sf7 Lxc2 8. Sxd8 Kxd8 9. Dxc2 Ke8 10. Dd1
play all

Silvio-Baier-40-JT: Thema: Gesucht waren eindeutige orthodoxe Beweispartien mit weißer und schwarzer Homebasestellung, wobei auf jeder Seite ein Bauer umwandeln und von einer Figur (keinem Bauern) geschlagen werden sollte und zudem genau ein Stein eine zweizügige Rückkehr vollführt.

Moldenhauer: Computerprüfung: C+ Stelvio 1.4 in 00:04:33 Minuten. (hh:mm:ss)
Keine Lösung: BP 9.0. (2023-07-22)
comment

Keywords: Unique Proof Game, Excelsior black, Excelsior white, Homebase (2), Prentos Theme (Sl), Switchback (Dk), under-promotion (Sl)
Genre: Retro
Computer test: Stelvio 1.4
FEN: rnb1kb1r/ppppp1p1/8/8/8/8/PP1P1P1P/RNBQK1NR
Input: Gunter Jordan, 2021-05-10
Last update: Silvio Baier, 2023-08-15 more...

79 - P1389465
Silvio Baier
Roberto Osorio
179 feenschach 237, p. 240, 09-10/2019

(12+11) C+
BP in 9.5

1. h4 f5 2. h5 f4 3. h6 f3 4. hxg7 fxe2 5. gxf8=S exf1=L 6. Sg6 Ld3 7. Sxe7 Lxc2 8. Sxc8 Dxc8 9. Dxc2 Dd8 10. Dd1
play all

Silvio-Baier-40-JT: Thema: Gesucht waren eindeutige orthodoxe Beweispartien mit weißer und schwarzer Homebasestellung, wobei auf jeder Seite ein Bauer umwandeln und von einer Figur (keinem Bauern) geschlagen werden sollte und zudem genau ein Stein eine zweizügige Rückkehr vollführt.

more ...
comment

Keywords: Unique Proof Game, Excelsior black, Excelsior white, Homebase (2), Prentos Theme (Sl), Switchback (Dd), under-promotion (Sl)
Genre: Retro
Computer test: C+ Euclide 1.01 (more than 2 hours) Natch 3.1 found no solutions in 9.0 moves
FEN: rn1qk1nr/pppp3p/8/8/8/8/PP1P1PP1/RNBQK1NR
Input: Gunter Jordan, 2021-05-11
Last update: Silvio Baier, 2024-01-24 more...

80 - P1391304
Ivan Denkovski
76 feenschach 183, p. 382, 08/2010
Lob

(13+13) C+
BP in 24.0

1. h2-h4 a7-a5 2. h4-h5 Ta8-a6 3. h5-h6 Ta6-e6 4. h6xg7 Te6-e3 5. f2xe3 h7-h5 6. Ke1-f2 Sg8-h6 7. g7-g8=L Lf8-g7 8. Kf2-g3 Lg7-e5 9. Kg3-h3 f7-f6 10. Lg8-b3 h5-h4 11. c2-c4 0-0 12. Sb1-a3 Dd8-e8 13. Sa3-c2 De8-h5 14. c4-c5 Sh6-f7 15. c5-c6 Sb8-a6 16. c6xb7 c7-c5 17. a2-a3 c5-c4 18. Ta1-a2 c4-c3 19. Sc2-a1 c3-c2 20. b7-b8=D c2xd1=T 21. Db8-c7 Td1xf1 22. Dc7-c2 Tf1-f2 23. Dc2-d1 d7-d5 24. g2-g4 h4xg3ep#
play all

Henrik Juel: Euclide 1.01 found the solution quickly, but later got stuck on pos. 112, and I killed the program after some 20 hours (2021-07-04)
A.Buchanan: Congratulations Henrik you have invented the concept of "HC++" (2021-07-04)
more ...
comment

Keywords: Unique Proof Game, Valladao Task, Castling, En passant, under-promotion (Lt), Promotion (D), Pronkin Theme (D), Phoenix (t), Prenix (LD)
Genre: Retro
Computer test: Stelvio 1.5, in 2sec.
FEN: 2b2rk1/4pn2/n4p2/p2pb2q/8/PB2P1pK/RP1PPr2/N1BQ2NR
Reprints: feenschach 212 04/2015
Input: A.Buchanan, 2021-07-03
Last update: Reto, 2023-08-19 more...

81 - P1392473
Thomas Thannheiser
23 Schach in Schleswig-Holstein 04/2015

(16+11) C+
BP in 10.5

1. d4 e6 2. d5 Ke7 3. Dd4 Kd6 4. Dxa7 Se7 5. Dxb8 Kc5 6. Dxc8 Kb6 7. Dxd8 Ka7 8. Dxe7 Td8 9. Lg5 Kb8 10. Sd2 Kc8 11. 0-0-0
play all

Schwarze Scheinrochade.

more ...
comment

Keywords: Unique Proof Game, Königswanderung, Castling
Genre: Retro
Computer test: C+ Euclide 1.01, no solution in 10.0
FEN: 2kr1b1r/1pppQppp/4p3/3P2B1/8/8/PPPNPPPP/2KR1BNR
Input: Gunter Jordan, 2021-08-04
Last update: A.Buchanan, 2022-02-08 more...