Die Schwalbe

53 problem(s) found in 3418 milliseconds (displaying 53 problem(s)). [COMMENTDATE>=20200919 AND NOT K='Hilfsrückzüger' AND NOT S='Best Problems' AND K='Uneindeutige Beweispartie'] [download as LaTeX]

1 - P0000006
Ulrich Ring
5407 Die Schwalbe 97 02/1986
P0000006
(10+3) C+
BP in 25.5
1. Sa3 d5 2. Sh3 Lg4 3. Sf4 Lf3 4. gxf3 g5 5. Lh3 gxf4 6. Lf5 Sf6 7. Le4 Tg8 8. Sc4 Tg3 9. hxg3 dxc4 10. gxf4 Dd3 11. cxd3 a5 12. Db3 a4 13. Th6 axb3 14. axb3 Ta3 15. bxc4 Tc3 16. bxc3 Sd5 17. cxd5 e5 18. fxe5 Sc6 19. La3 Sd4 20. Tc6 Lh6 21. Ld6 Le3 22. fxe3 f5 23. cxd4 fxe4 24. fxe4 bxc6 25. Ta3 cxd6 26. exd6
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Moldenhauer: Computerprüfung: C+ bei NUPG Stelvio 1.11 00:08:50 Minuten. (hh:mm:ss)
Beispiel Stelvio 1.11.
1.Sa3 Sf6 2.Sc4 d5 3.Sh3 Lg4 4.Sf4 Lf3 5.gxf3 Tg8 6.Lh3 dxc4 7.Lf5 Dd3 8.Le4 g5 9.cxd3 gxf4 10.Db3 Tg3 11.hxg3 a5 12.Th6 a4 13.gxf4 axb3 14.axb3 Ta3 15.bxc4 Tc3 16.bxc3 Sc6 17.La3 Sd4 18.cxd4 Sd5 19.Tc6 Lh6 20.Ld6 bxc6 21.Ta3 cxd6 22.cxd5 e5 23.fxe5 Le3 24.exd6 f5 25.fxe3 fxe4 26.fxe4
Keine Lösung: BP 24.5, BP 25.0. (2023-03-27)
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Keywords: Non-Unique Proof Game
Genre: Retro
Computer test: Stelvio 1.11
FEN: 4k3/7p/2pP4/3P4/3PP3/R2PP3/3PP3/4K3
Input: Gerd Wilts, 1995-06-03
Last update: Silvio Baier, 2023-08-15 more...
2 - 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
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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...
3 - 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+
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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)
comment
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...
4 - P0000548
Alexander Kislyak
3463 Die Schwalbe 68 04/1981
Dr. L. Ceriani zum Gedenken
P0000548
(10+13) cooked
BP in 46,0
AL: 1. d4 a5 2. c4 a4 3. b4 a3 4. Lb2 axb2 5. a4 c5 6. a5 b5 7. a6 Lb7 8. a7 Da5 9. bxa5 Sc6 10. a6 0-0-0 11. a8=S Sa5 12. Sc7 b4 13. a7 b3 14. a8=S Sf6 15. Sb6 Kb8 16. Se6 dxe6 17. Sd7 Ka8 18. Sxf8 Td5 19. cxd5 c4 20. d6 c3 21. d7 c2 22. d5 c1=L 23. d6 Ld5 24. Ta4 Se8 25. Tf4 f6 26. Sc3 b1=L 27. d8=S b2 28. d7 Lg6 29. Sb7 b1=L 30. d8=S Lf7 31. Sg6 Lf5 32. Sd6 Lg4 33. Sf5 hxg6 34. Sb7 gxf5 35. Sc5 Th4 36. S5e4 fxe4 37. e3 Lf5 38. Ke2 Tg4 39. h4 Sb3 40. h5 Sa1 41. h6 Ld2 42. h7 Le1 43. h8=S Sc7 44. Sg6 Sb5 45. Sh4 Sa3 46. S4f3 exf3+
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Korrektur siehe 3463v
James Malcom: How in the world can a non-unique PG be cooked? I'm unmarking it, for now. (2021-01-25)
A.Buchanan: Maybe the intended theme was not forced? Haven’t looked at this problem though (2021-01-26)
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Keywords: Non-Unique Proof Game, Ceriani-Frolkin Theme, Non-standard material (ll), Castling, konsekutive Umwandlungen 8, Promotion, Superseded by (P0000582)
Genre: Retro
FEN: k7/4pbp1/4pp2/3b1b2/5Rr1/n1N1Pp2/4KPP1/n2QbBNR
Input: Gerd Wilts, 1995-06-03
Last update: A.Buchanan, 2021-01-26 more...
5 - P0000582
Alexander Kislyak
3463v Die Schwalbe 72 12/1981
Dr. L. Ceriani zum Gedenken
P0000582
(10+13) cooked
BP in 46,0
AL: 1. b4 a5 2. c4 a4 3. d4 a3 4. Lb2 axb2 5. a4 b5 6. a5 c5 7. a6 Da5 8. a7 Sc6 9. bxa5 Lb7 10. a6 0-0-0 11. a8=S b4 12. Sc7 Sa7 13. Se6 Sb5 14. Sxf8 Sh6 15. a7 f6 16. a8=S Sf7 17. Sc7 b3 18. Sce6 dxe6 19. Ta4 Td5 20. cxd5 c4 21. d6 c3 22. d5 c2 23. Sc3 Sg5 24. d7+ Kb8 25. d6 c1=L 26. d8=S b1=L 27. d7 b2 28. Sf7 Lf5 29. Sd6 Lh3 30. d8=S b1=L 31. S8f7 Lg6 32. Sh6 Lf7 33. Sg6 hxg6 34. Shf5 Th4 35. Tf4 gxf5 36. Sde4 fxe4 37. e3 Lf5 38. Ke2 Tg4 39. h4 Sa3 40. h5 Sb1 41. h6 Ka8 42. h7 Ld5 43. h8=S Ld2 44. Sg6 Le1 45. Sh4 Sh3 46. Shf3 exf3+
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Cook: NL: 1. b4 a5 2. c4 a4 3. d4 a3 4. Lb2 axb2 5. a4 b5 6. a5 c5 7. a6 Sc6 8. a7 Lb7 9. Ta6 Da5 10. bxa5 0-0-0 11. a8=S b4 12. Sc7 b3 13. Se6 Sb4 14. Sxf8 Sf6 15. Te6 dxe6 16. a6 Td5 17. cxd5 c4 18. a7 c3 19. a8=S c2 20. Sc3 c1=L 21. Sb6+ Kb8 22. Sc8 b1=L 23. d6 Lg6 24. d7 b2 25. d8=D b1=L 26. Da5 Lbf5 27. d5 Se4 28. d6 f6 29. d7 Lf7 30. Sg6 hxg6 31. d8=T Lh3 32. Td4 Th4 33. Df5 gxf5 34. Sd6 Sg5 35. Tf4 Ka8 36. S6e4 fxe4 37. e3 Lf5 38. Ke2 Tg4 39. h4 Sc2 40. h5 Sa3 41. h6 Sb1 42. h7 Ld5 43. h8=S Sh3 44. Sg6 Ld2 45. Sh4 Le1 46. Shf3 exf3+
James Malcom: Again, how is this cooked? (2021-01-25)
A.Buchanan: The AL has 5 Wh S promotions in 46.0 moves but the cook shows this is not necessary. (2021-01-26)
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Keywords: Non-Unique Proof Game, Ceriani-Frolkin Theme (SSSSS), Non-standard material (ll), Castling, Promotion, konsekutive Umwandlungen 8
Genre: Retro
FEN: k7/4pbp1/4pp2/3b1b2/5Rr1/2N1Pp1n/4KPP1/1n1QbBNR
Input: Gerd Wilts, 1995-06-03
Last update: A.Buchanan, 2021-01-26 more...
6 - 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.
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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...
7 - P0000778
Gideon Husserl
1464 Die Schwalbe 31 02/1975
P0000778
(15+16)
Wieviele Züge hat die KBP?
1. Sa3 Sa6 2. Tb1 Sb4 3. Ta1 Sd5 4. Tb1 Sc3 5. Sb5 Sxb1 6. Sa3 Sc3 7. Sb1 Sa4 8. Sf3 Sc5 9. Se5 Sb3 10. Sg4 Sa1 11. Sf6+ z.B.
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10,5
Henrik Juel: The black men have made an even number of moves, so the white men (ending with Sf6+) have made an odd number of moves; hence [Ta1] has made an odd number of moves and was captured on b1; the fastest way of doing this is to let [Sb8] do all the black moves, incl. 5... SxTb1 and 10... Sb3-a1 (2023-04-20)
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Keywords: Non-Unique Proof Game
Genre: Retro
FEN: r1bqkbnr/pppppppp/5N2/8/8/8/PPPPPPPP/nNBQKB1R
Input: Gerd Wilts, 1995-06-03
Last update: A.Buchanan, 2023-04-20 more...
8 - P0000790
Gideon Husserl
1555 Die Schwalbe 33 06/1975
P0000790
(14+16)
Wieviele und welche Steine zogen in der KBP?
1. Sa3 Sa6 2. Sh3 Sc5 3. Tg1 Sb3 4. Th1 Sxc1 5. Tg1 Sb3 6. Db1 Sd4 7. Dc1 Sf3+ 8. Kd1 Sxg1 9. Sb1 Sf3 10. Sg1 Se5 11. Ke1 Sc6 12. Dd1 Sb8
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Mario Richter: In der Lösungsbesprechung wurde die Forderung präzisiert: Wieviele (und welche) Steine zogen in der KBP mindestens?
Die richtige Antwort ist: 6 (sSb8, wSb1, wDd1, wKe1, wSg1, wTh1).
Die kürzeste BP braucht 12 Züge von Schwarz (Sb8xLc1-f3xTg1, dann zurück nach b8), wK und wSS können nur gerade Anzahlen von Zügen machen, wegen Th1-g1 muß also wD oder wTa1 ein Tempo verlieren. In Rahmen des 12-Züge-Limits schafft das nur die wD. (2010-05-24)
Moldenhauer: Computerprüfung: C+ NUPG cooked Stelvio 1.11 1 Sekunde.
Keine Lösung: BP 11.0, BP 11.5. (2023-04-06)
comment
Keywords: Non-Unique Proof Game, Tempo Loss, Homebase (2)
Genre: Retro
FEN: rnbqkbnr/pppppppp/8/8/8/8/PPPPPPPP/RN1QKBN1
Input: Gerd Wilts, 1995-06-03
Last update: A.Buchanan, 2023-04-07 more...
9 - P0001601
Filip S. Bondarenko
471 Europe Echecs 334 10/1986
P0001601
(16+0)
Ergänze die 16 schwarzen Steine so, daß kein Stein angegriffen ist!
KBP
1. Sf3 b5 2. Sd4 e5 3. Sc6 g6 4. e3 Sf6 5. c4 Sd5 6. d4 Sb6 7. c5 a5 8. b4 a4 9. Ke2 Sa6 10. Kf3 e4+ 11. Kg4 Ld6 12. Sb8 Ke7 13. Sa3 Tf8 14. Kg5 f5 15. g4 h5 16. h4 Lh2 17. c6 d6 18. Lb2 f4 19. Kh6 Ke6 20. g5 Kf5 21. Db3 Kg4 22. Tc1 Kf3 23. Tc5 Lh3 24. Te5 Sc5 25. Lc4 Sd3 26. Kh7 Ke2 27. Te8 f3 28. Le6 Ta7 29. d5 Sa8 30. Sc4 Tf4 31. Kh8 Tg4 32. Lg7 Df6 33. Tc1 Da1 34. Tc3 Dh1 35. a3 Tg1 36. Sb6 Lg2 37. S6d7 Se1 38. Db2+ Kd1
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Originalforderung: Compléter le diagramme par les 16 pièces noires de façon à ce qu'aucune pièce des deux camps ne soit en prise.
Plus courte partie justificative aboutissant à cette position.
hans: Kd1, Dh1, Tg1, Ta7, Lg2, Lh2, Se1, Sa8, a4, b5, c7, d6, e4, f3, g6, h5. (2013-07-27)
Mario Richter: @Alain: with black Bishop on f1 instead of g2 white pawn g5 is attacked by black Rook g1 (2021-08-23)
Alain Brobecker: @Mario, you are right of course, thank you for correcting this! (2021-08-23)
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comment
Keywords: Add pieces, Non-Unique Proof Game, Construction task
Genre: Retro
FEN: 1N2R2K/3N2B1/2P1B3/3P2P1/1P5P/P1R1P3/1Q3P2/8
Input: Gerd Wilts, 1995-06-03
Last update: Alain Brobecker, 2021-08-23 more...
10 - P0001640
A. d'Ales
509 Europe Echecs 367/368 07/1989
P0001640
(15+16) cooked
KBP in 25,0
NL: 1. b4 a5 2. h4 d6 3. Th3 g6 4. Te3 Lg7 5. g3 Lc3 6. Lh3 Ta6 7. Kf1 Tc6 8. Kg2 b6 9. Kf3 Dd7 10. Ke4 Tc4+ 11. Kd5 Dxh3 12. Sf3 Lg4 13. Sd4 Sd7 14. Sb3 Td4+ 15. Kc6 Se5+ 16. Kb7 Kd7 17. Dh1 Ke6 18. Kc8 Lh5 19. Da8 Kf5 20. g4+ Kf4 21. f3 Kg3 22. Kd8 Kf2 23. Ke8 Ke1
AL wurde nie veröffentlicht.
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Moldenhauer: Computerprüfung: Cooked Stelvio 1.6 01:00:21 Stunde. (hh:mm:ss)
1.Sf3 a5 2.b4 g6 3.h4 Lg7 4.Th3 Lc3 5.Sd4 Ta6 6.Te3 Tc6 7.g3 Tc4 8.Lh3 d6 9.Kf1 Dd7
10.Kg2 Dxh3+ 11.Kf3 Lg4+ 12.Ke4 Sd7 13.Kd5 b6 14.Sb3 Td4+ 15.Kc6 Se5+ 16.Kb7 Kd7
17.Dh1 Ke6 18.Kc8 Kf5 19.Da8 Lh5 20.g4+ Kf4 21.f3 Kg3 22.Kd8 Kf2 23.Ke8 Ke1
Keine Lösung: BP 22.5.
Wenn die Forderung KBP 25.0 richtig ist dann Cooked. (2023-09-28)
comment
Keywords: Interchange, Non-Unique Proof Game, Non-Unique Proof Game
Genre: Retro
FEN: Q3K1nr/2p1pp1p/1p1p2p1/p3n2b/1P1r2PP/1Nb1RP1q/P1PPP3/RNB1k3
Input: Gerd Wilts, 1995-06-03
Last update: A.Buchanan, 2014-05-21 more...
11 - P0001653
Philippe Leroy
522 Europe Echecs 373 01/1990
P0001653
(12+13)
BP in 60.0
Es fand ein ep-Schlag statt. Welcher?
1. a3 b5 2. a4 b4 3. a5 c5 4. a6 Lb7 5. axb7 a5 6. c4 bxc3ep 7. e4 f5 8. e5 Sf6 9. exf6 c2 10. De2 d5 11. De4 dxe4 12. g4 h5 13. g5 Th6 14. gxh6 g5 15. Se2 h4 16. Sg3 hxg3 17. f7+ Kd7 18. d4 c4 19. d5 Ta6 20. h7 g2 21. h8=L g1=L 22. Lc3 a4 23. La5 g4 24. h4 Lh2 25. h5 g3 26. h6 g2 27. h7 g1=L 28. h8=L a3 29. Lhc3 a2 30. f3 Ld4 31. Lcb4 Lh8 32. La3 c3 33. Le3 c1=L 34. Lg1 c2 35. Sc3 Tf6 36. Sa4 Sa6 37. b8=L Lch6 38. Lba7 Lb8 39. Th4 c1=L 40. d6 Kc6 41. d7 Db6 42. d8=L Lcg5 43. Lc7 e3 44. Lch2 e5 45. Sc5 Sc7 46. Tb4 e4 47. Kd1 e2+ 48. Kc2 e1=L 49. f4 Leh4 50. Kc3 e3 51. Kd4 e2 52. Ke5 e1=L 53. Td1 a1=L 54. Td7 Leg3 55. Sa4 Df2 56. Sb6 Lfg7 57. Lb5+ Kc5 58. Lc6 Sd5+ 59. Tc7 Sxf4 60. f8=L+ Td6
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James Malcom: A very interesting retro problem, with long-winded bishops promotions to cover its en passant tracks. (2021-01-24)
Hans-Jürgen Manthey: damit der Player klappt, muß 38. La7 in 38. Lba7 geändert werden. (2021-01-25)
James Malcom: Fixed. (2021-01-25)
comment
Keywords: Constrained problem, En passant, Non-standard material, Promotion, Non-Unique Proof Game
Genre: Retro
FEN: 1b3B1b/B1R3b1/1NBr3b/B1k1Kpb1/1R3n1b/B5b1/1P3q1B/b5B1
Input: Gerd Wilts, 1995-06-03
Last update: James Malcom, 2021-01-25 more...
12 - P0001657
Philippe Leroy
526 Europe Echecs 376 04/1990
P0001657
(13+11) cooked
BP in 37,0
1. h4 d5 2. h5 d4 3. h6 d3 4. hxg7 h5 5. g4 h4 6. g5 h3 7. e4 h2 8. Sh3 Th6 9. Tg1 h1=D 10. e5 Dc6 11. Lg2 Dc3 12. dxc3 Tc6 13. e6 Sh6 14. g8=L Lg7 15. exf7 Kf8 16. Sd2 e5 17. Sf3 e4 18. Sh4 d2 19. Ke2 e3 20. Kf3 e2 21. g6 e1=D 22. Tb1 Dee7 23. De1 d1=T 24. Lg5 Da3 25. bxa3 Td4 26. Tb3 Tb4 27. cxb4 Lb2 28. Le7 Kg7 29. f8=S Sa6 30. Lc4 Sf7 31. Sd7 Kh6 32. Sb6 cxb6 33. g7 Sc7 34. La6 bxa6 35. g8=T Lb7 36. Tg5 Tc8 37. Ta5 bxa5
play all play one stop play next play all
Cook: 1. h4 d5 2. h5 e5 3. h6 f5 4. hxg7 h5 5. Sa3 h4 6. Sc4 h3 7. Sb6 h2 8. e4 Th3 9. exf5 Ta3 10. Sh3 Sa6 11. Tg1 h1=D 12. g4 Df3 13. f6 Dc3 14. dxc3 cxb6 15. Tb1 Sc7 16. La6 bxa6 17. bxa3 Lb4 18. cxb4 Sh6 19. g8=L d4 20. Ld5 Kf8 21. Lg2 e4 22. Ke2 e3 23. Kf3 e2 24. f7 Kg7 25. f8=S e1=L 26. Sg6 Lc3 27. Sh4 d3 28. g5 d2 29. De1 d1=T 30. g6 Td6 31. Lg5 Tc6 32. Le7 Sf7 33. Tb3 Kh6 34. g7 Lb2 35. g8=T Lb7 36. Tg5 Tc8 37. Ta5 bxa5
A.Buchanan: The unsoundness in this non-unique PG is that 6 promotions (apparently intended) are not forced (2023-05-11)
more ...
comment
Keywords: Ceriani-Frolkin Theme (dLdtST), Promotion, Non-Unique Proof Game, konsekutive Umwandlungen 6
Genre: Retro
Computer test: Computerprüfung: many solutions Stelvio 1.11 48 Sekunden. Keine Lösung: BP 36.0, BP 36.5.
FEN: 2rq4/pbn1Bn2/p1r4k/p7/1P5N/PR3K1N/PbP2PB1/4Q1R1
Input: Gerd Wilts, 1995-06-03
Last update: A.Buchanan, 2023-05-11 more...
13 - P0001885
Thomas R. Dawson
Hampstead and Highgate Express 1912
P0001885
(12+14)
BP in 34,0
1. a4 c5 2. a5 Db6 3. Ta4 Sc6 4. Td4 Tb8 5. b4 cxd4 6. b5 e5 7. d3 La3 8. Le3 Lc1 9. bxc6 Db2 10. c7 b5 11. a6 Tb7 12. axb7 h5 13. b8=L Lb7 14. c8=D+ Ke7 15. Sf3 d5 16. Dh3 Th6 17. g4 Ta6 18. Dg3 h4 19. c4 hxg3 20. h4 Ta1 21. h5 Kf6 22. Sh2 dxe3 23. h6 Kg5 24. h7 Kh4 25. c5 a5 26. c6 a4 27. c7 b4 28. c8=T b3 29. h8=S Se7 30. Sg6 fxg6 31. Lh3 Sc6 32. 0-0 Sb4 33. Ld6 Sc2 34. Td8 Se1
play all play one stop play next play all
"Promenades to Power"

Es läßt sich beweisen, daß die UWs in D,T,L,S zwingend erfolgt sind (a2-b8=L,h2-b8=S und entweder b2-c8=D/c2-c8=T oder b2-c8=T/c2-c8=D).
Erich Bartel: weitere Nachdrucke:
3) 160 Die Allumwandlung im Problemschach VIII 1966a---
4) Schach ohne Grenzen 1969.-- (2007-01-09)
Sally: Vier erzwungene Umwandlungen. (2012-02-21)
Moldenhauer: Computerprüfung: C+ Stelvio 1.11 da NUPG sonst cooked in 00:03:51 Minuten. (hh:mm:ss)
Keine Lösung: BP 33.0, BP 33.5.
Beispiel: 1.Sf3 Sf6 2.a4 Sd5 3.a5 Sf4 4.Ta4 c5 5.Td4 Db6 6.b4 Sc6 7.b5 Tb8 8.bxc6 cxd4 9.c7 e5 10.d3 La3 11.Le3 Lc1 12.c4 Db2 13.c5 b5 14.c6 Tb6 15.axb6 Ke7 16.b7 Kf6 17.b8L Lb7 18.c8D b4 19.c7 d5 20.Dh3 b3 21.c8T h5 22.g4 h4 23.Dg3 hxg3 24.h4 Th6 25.Lh3 dxe3 26.0–0 Sg2 27.Sh2 Se1 28.h5 Kg5 29.Td8 Ta6 30.Ld6 Kh4 31.h6 Ta1 32.h7 a5 33.h8S a4 34.Sg6+ fxg6
Umwandlungen: 17.b8L, 18.c8D, 21.c8T, 33.h8S. (2023-04-19)
comment
Keywords: Allumwandlung, Castling (wk), Non-Unique Proof Game
Genre: Retro
FEN: 3R4/1b4p1/3B2p1/3pp3/p5Pk/1p1Pp1pB/1q2PP1N/rNbQnRK1
Reprints: 53 Caissa's Wild Roses 1935
Chess unlimited 1969
150 Shortest Proof Games 11/1991
Input: Gerd Wilts, 1995-06-03
Last update: Gunter Jordan, 2020-07-01 more...
14 - P0001967
Nenad Petrovic
628 Sahovski vjesnik 1950
Dr. Fabel und Dr. Ceriani gewidmet
2. Preis
P0001967
(15+15)
Längste Beweispartie?
(AL: 1021,0)
1. S S 50. S b6 100. S h6 250. S h3 300. a3 S 450. a6 S 500. b3 S 550. g3 S 600. 0-0 S 649. S hxSg 699. h3 S 899. h7 S 949. axSb Ke8 950 Tf1 Kd8 951. Tg1 Ke8 952. Tf1 Dd8 1020. Kd1 Kd8 1021. De1 Ke8=
play all play one stop play next play all
Henrik Juel: Note that in problems castling acts like capture and pawn move with respect to the 50 moves rule. After 949.a6xSb7 there are 4 moves left by [Pa7]; but each camp can shift only KDT, on d1-g1 and b8-e8, respectively, so the triple repetition rule now limits the length of the game. (2004-09-09)
A.Buchanan: In some problems it's certainly the case that the 50-move rule operates incorrectly in this way. Such problems are fine, but obviously wouldn't want to impose this as a standard. Different composers can make different assumptions here (2023-06-20)
comment
Keywords: 50 move rule, Non-Unique Proof Game, Longest Proof Game, Castling
Genre: Retro
FEN: Nrq1kb2/1PpppppP/1p6/8/8/pP4P1/BRPPPPp1/BrnKQ1Rb
Reprints: (I) Problem 5-6 12/1951
Problem 7-9 03/1952
1439 FIDE Album 1945-1955 1964
(130) Problem 91-94 04/1964
Input: Gerd Wilts, 1995-06-03
Last update: A.Buchanan, 2012-04-08 more...
15 - P0002316
Alexander Kislyak
3587 feenschach 60 05/1982
A. G. Kuznecow gewidmet
1. Preis
P0002316
(15+13)
BP in 44.0
1. a4 Sa6 2. a5 Sc5 3. a6 b6 4. Ta4 Sb7 5. axb7 c5 6. b8=L g6 7. Lg3 Dc7 8. Lh4 Dg3 9. hxg3 Lh6 10. Tg4 f5 11. Sf3 f4 12. Sd4 f3 13. Sc3 Lf4 14. gxf4 a5 15. Lg3 a4 16. Lh2 a3 17. g3 a2 18. Lg2 a1=D 19. 0-0 Da2 20. Kh1 Sf6 21. Lg1 Sd5 22. Kh2 Se3 23. Kh3 Sxd1 24. Kh4 Se3 25. Kg5 Tf8 26. Kh6 Tf5 27. Kg7 c4 28. Kh8 Kf7 29. Sd1 Kf6 30. Kg8 c3+ 31. Kf8 De6 32. Ke8 Kg7 33. Kd8 Kh6 34. Kc7 Ta7+ 35. Kb8 Tb7+ 36. Ka8 Tb8+ 37. Ka7 Tb7+ 38. Ka6 Tf7 39. Kb5 Kh5 40. Ka4 h6 41. Ka3 Sd5 42. Ka2 Sc7+ 43. Ka1 Ta7+ 44. Kb1 Da2
play all play one stop play next play all
Paulo Roque: Is not possible: 38... Kh5 39.Kb5 (because black rook at square f5).
Probably the continuation of the author:
38...Tf7 39.Kb5 Kh5 40.Ka4 h6 41.Ka3 Sd5 42.Ka2 Sc7+ 43.Ka1 Ta7+ 44.Kb1 Da2# (2008-12-11)
James Malcom: Fixed. (2021-02-15)
comment
Keywords: Promotion (L), Promenade (K), Castling (wk), Non-standard material, Non-Unique Proof Game
Genre: Retro
FEN: 2b5/r1nppr2/1p4pp/7k/3N1PR1/2p2pP1/qPPPPPB1/1KBN1RB1
Reprints: 152 Shortest Proof Games 11/1991
(7) feenschach 103 01-09/1992
(8) diagrammes 15 07-09/1994
Input: Gerd Wilts, 1995-06-03
Last update: James Malcom, 2021-02-15 more...
16 - P0002582
Alexander Kislyak
5604 feenschach 92 09-10/1989
P0002582
(10+15)
BP in 33,0
1. b4 c5 2. Lb2 c4 3. e3 e5 4. Ld3 Lc5 5. bxc5 c3 6. c6 cxd2+ 7. Ke2 d6 8. c7 Le6 9. c8=S Dg5 10. Se7 a5 11. Sg6 hxg6 12. c4 a4 13. c5 a3 14. c6 axb2 15. c7 Sc6 16. c8=S Sh6 17. Se7 Sg4 18. Sf5 gxf5 19. h4 Th6 20. h5 Tg6 21. h6 Sh2 22. h7 Sf1 23. h8=T f6 24. T8h3 Kd7 25. a4 Th8 26. a5 T8h6 27. a6 Sb4 28. a7 Sc2 29. a8=T Sa3 30. Ta4 Lg8 31. Te4 fxe4 32. f4 Dg4+ 33. Tf3 exf3+
play all play one stop play next play all
Frolkin-Thema, Typ SSTT. "Gefällt mir am besten, da die Begründungen für TT-UW zeitlich weit entkoppelt von den UW sind!!" (GL) [3,2/II]
Paulo Roque: obs: 23...Kd7 24.T8h3 f6 (2008-12-29)
Moldenhauer: Computerprüfung: Cooked Stelvio 1.6 184:20:33 Stunden. (hh:mm:ss)
1.d4 Sa6 2.Ld2 Sb4 3.e3 Sf6 4.Ld3 c5 5.Ke2 c4 6.h4 c3 7.h5 cxd2 8.c4 Sc2 9.c5 Sg4
10.c6 e5 11.c7 Lc5 12.dxc5 d6 13.c6 Le6 14.c8=S Dg5 15.Se7 Sh2 16.Sf5 Sf1 17.c7 a5
18.c8=S a4 19.Sce7 a3 20.Sg6 axb2 21.a4 hxg6 22.a5 Th6 23.a6 gxf5 24.a7 Tg6
25.h6 Kd7 26.h7 f6 27.h8=T Sa3 28.T8h3 Th8 29.a8=T Thh6 30.Ta4 Lg8 31.Te4 fxe4
32.f4 Dg4+ 33.Tf3 exf3+
Keine Lösung: BP 32.0 wegen der Retraktion. Da NUPG C+. (2023-09-28)
comment
Keywords: Non-Unique Proof Game, Ceriani-Frolkin Theme (SSTT), Promotion (SSTT)
Genre: Retro
FEN: 6b1/1p1k2p1/3p1prr/4p3/5Pq1/n2BPp2/1p1pK1P1/RN1Q1nNR
Input: Gerd Wilts, 1995-06-03
Last update: A.Buchanan, 2021-05-09 more...
17 - 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...
18 - P0004137
Hans Stempel
Die Schwalbe 1952
2. Preis
105. TT
P0004137
(12+15)
Längste Beweispartie?
a) Da li su tocno ordedena crna uzimanja?
R: 1. Tb8-b5 h4-h5 2. b7xLa6 Lb5-a6 3. Sd2-f1 Lc4-b5 4. Kf1-f2 f2-f3 5. Se4-d2 Ld5-c4 6. g6-g5 Sf3-e1 7. g7-g6 Sd4-f3 8. f3xTe2 Kd1-c1 9. f4-f3 Dc1-b1 10. Sb3-a1 Dd2-c1 11. Sc5-b3 Sf3-g1 12. Sa6-c5 Se1-f3 13. c4-c3 Kc1-d1 14. Ta8-b8 Dc3-d2 15. Sb8-a6 Td2-e2 16. c5-c4 Sb5-d4 17. Ke2-f1 Td1-d2+ 18. e5xLf4 Sa3-b5 19. f3xTg2 Tg1-g2 20. e6-e5 Lg5-f4 21. f4-f3 Sg2-e1 22. Kf3-e2 Dd2-c3 23. Kg4-f3 Se1-g2 24. Df3-h1 Th1-g1 25. De2-f3 Sf3-e1 26. De1-e2 De2-d2 27. Kf5-g4 Sg1-f3 28. Sf6-e4 Lg2-d5 29. Da5-e1 Dh5-e2 30. Dd8-a5 0-0-0 31. c7-c5 Dd1xh5 32. Sg8-f6 Lf1-g2 33. Kg6-f5 g2-g3 34. Kf7-g6 e3-e2 35. f5-f4 Lc1-g5 36. Ld6-h2 Lh6-c1 37. Tg3-h3 Lg5-h6 38. Ke8-f7 Lf4-g5 39. Lf8-d6 Le3-f4 40. Tg6-g3 Ld2-e3 41. Th6-g6 Lc1-d2 42. Th8-h6 Sb1-a3 43. e7-e6 d2-d3 44. f7-f5 h3-h4 45. h7-h5 h2-h3
play all play one stop play next play all
1646 Züge
Hans-Jürgen Manthey: R: 1. Tb8-b5 h4-h5 2. b7XLa6 Lb5-a6 3. Sd2-f1 Lc4-b5 4. Kf1-f2 f2-f3 5. Se4-d2 Ld5-c4 6. g6-g5 Sf3-e1 7. g7-g6 Sd4-f3 8. f3xTe2 Kd1-c1 9. f4-f3 Dc1-b1 10. Sb3-a1 Dd2-c1 11. Sc5-b3 Sf3-g1 12. Sa6-c5 Se1-f3 13. c4-c3 Kc1-d1 14. Ta8-b8 Dc3-d2 15. Sb8-a6 Td2-e2 16. c5-c4 Sb5-d4 17. Ke2-f1 Td1-d2+ 18. e5xLf4 Sa3-b5 19. f3xTg2 Tg1-g2 20. e6-e5 Lg5-f4 21. f4-f3 Sg2-e1 22. Kf3-e2 Dd2-c3 23. Kg4-f3 Se1-g2 24. Df3-h1 Th1-g1 25. De2-f3 Sf3-e1 26. De1-e2 De2-d2 27. Kf5-g4 Sg1-f3 28. Sf6-e4 Lg2-d5 29. Da5-e1 Dh5-d2 30. Dd8-a5 O-O-O 31. c7-c5 Dd1xh5 32. Sg8-f6 Lf1-g2 33. Kg6-f5 g2-g3 34. Kf7-g6 e3-e2 35. f5-f4 Lc1-g5 36. Ld6-h2 Lh6-c1 37. Tg3-h3 Lg5-h6 38. Ke8-f7 Lf4-g5 39. Lf8-d6 Le3-f4 40. Tg6-g3 Ld2-e3 41. Th6-g6 Lc1-d2 42. Th8-h6 Sb1-a3 43. e7-e6 d2-d3 44. f7-f5 h3-h4 45. h7-h5 h2-h3 (2021-07-16)
Henrik Juel: The stipulation 'Longest proof game' makes little sense here
The serbo-kroatian question in a) probably means something like
What is the exact order of the captures by Black? (2021-07-16)
Mario Richter: This problem was awarded the second prize in the 105. TT of 'Die Schwalbe', which had the theme "Longest Proof Games" (s. also P0004136, P0004139). I do not have the original german stipulation, but I think the serbo-kroatian question means something like "What black captures are exactly determined?"
(The order of the captures is not unique - one can first retract f3xTe2 or f3xTg2 ...) (2021-07-16)
comment
Keywords: Longest Proof Game, Non-Unique Proof Game
Genre: Retro
FEN: 2b5/p2p4/p7/1r4pP/8/2pPPPPr/PPP1pkpb/nQK1NnNq
Reprints: Problem 15-16 05/1952
Input: Gerd Wilts, 1995-06-03
Last update: James Malcom, 2021-07-17 more...
19 - P0005276
Paul Vatarescu
12 L'Echiquier de France 01/1957
P0005276
(13+15)
#1
KBP?
1. g4 Sf6 2. Lh3 Sxg4 3. Sf3 Sxh2 4. Txh2 h5 5. Se5 Th6 6. Le6 Tg6 7. Tg2 Txg2
play all play one stop play next play all
Moldenhauer: Computerprüfung: Stelvio 1.11 C+ KBP 7.0, cooked in 1 Sekunde.
Keine Lösung: vor BP 7.0.
Beispiel: 1.Sf3 Sf6 2.Se5 h5 3.g4 Sxg4 4.Lh3 S+h2 5.Txh2 Th6
6.Le6 Tg6 7.Tg2 Txg2 #1. (2023-03-22)
comment
Keywords: Non-Unique Proof Game
Genre: Retro
FEN: rnbqkb2/ppppppp1/4B3/4N2p/8/8/PPPPPPr1/RNBQK3
Input: Gerd Wilts, 1995-06-03
Last update: A.Buchanan, 2012-04-10 more...
20 - P0005336
Dezsö Elekes
4336 The Fairy Chess Review 3 28/11/1939
P0005336
(14+12) cooked
KBP?
1. g4 h5 2. gxh5 d5 3. h6 Dd6 4. hxg7 Dxh2 5. gxh8=T Dxh1 6. Txh1
play all play one stop play next play all
Duale sind möglich
"These promoted piece games are anticipated in general idea by CMF" (TRD)
Moldenhauer: Computerprüfung: C+ KBP 5.5 cooked in 1 Sekunde.
Keine Lösung: vor BP 5.5.
Beispiellösung:1.g4 d5 2.g5 h6 3.gxh6 Dd6 4.hxg7 Ddxh2
5.gxh8=T Dxh1 6.Txh1 (2023-03-22)
comment
Keywords: Non-Unique Proof Game, Pronkin Theme (T), Homebase (w)
Genre: Retro
Computer test: Computerprüfung: C+ KBP 5.5 cooked in 1 Sekunde. Keine Lösung: vor BP 5.5. Beispiellösung:1.g4 d5 2.g5 h6 3.gxh6 Dd6 4.hxg7 Ddxh2 5.gxh8=T Dxh1 6.Txh1
FEN: rnb1kbn1/ppp1pp2/8/3p4/8/8/PPPPPP2/RNBQKBNR
Input: Gerd Wilts, 1995-06-03
Last update: A.Buchanan, 2024-03-06 more...
21 - P0005354
anonymous
52 Die Welt 05/04/1947
P0005354
(16+16)
Weiß beginnt mit 1. f3 2. Kf2 3. Kg3 4. Kh4.
Wie muß Schwarz spielen, um darauf im vierten Zug mattzusetzen?
1. f3 e5 2. Kf2 Df6 3. Kg3 Dxf3+ 4. Kh4 Le7#
play all play one stop play next play all
'Schachmatnaja Mosaika' gibt als Autor an: "A. Aljechin", ebenso 'Svobodnaia Gruzia'
Henrik Juel: If Mario is right, the author is no longer unknown (2021-10-31)
Henrik Juel: Black could also play 1... e6 (2021-10-31)
comment
Keywords: Constrained problem, Non-Unique Proof Game, Construction task
Genre: Retro
FEN: rnbqkbnr/pppppppp/8/8/8/8/PPPPPPPP/RNBQKBNR
Reprints: Der Schachzug (FV Schach Berlin) 18 01-02/1977
390 Schachmatnaja Mosaika , p. 128, 1984
1 Svobodnaia Gruzia 13/01/2005
Input: Gerd Wilts, 1995-06-03
Last update: Mario Richter, 2022-08-10 more...
22 - P0005358
Thomas R. Dawson
(4) The Chess Amateur 08/1914
P0005358
(9+12) C+
Black, having just made hist 25th move, is it possible for White to mate in 2?
(BP in 24,5)
1. Sc3 a5 2. Se4 Sa6 3. b4 a4 4. b5 a3 5. d4 b6 6. d5 Lb7 7. d6 exd6 8. Lf4 Dh4 9. bxa6 Dh3 10. c4 Sf6 11. Sxf6+ gxf6 12. c5 Lf3 13. exf3 Lh6 14. Lb5 c6 15. Kf1 cxb5 16. Se2 dxc5 17. Ld6 Ld2 18. Tg1 La5 19. gxh3 h6 20. Tg5 hxg5 21. Kg2 Th4 22. Db1 Ta4 23. Db4 cxb4 24. Sf4 gxf4 25. Tg1
play all play one stop play next play all
Black can have wasted only one move and so cannot have moved K or KR, which would require a second waste move returning to diagram. Hence Black is legally entitled to castle. Therefore White mates in 2 by: 1. Kh1! 0-0-0 2. Tc1, else 2. Tg8
Moldenhauer: Computerprüfung: C+ Stelvio NUPG cooked 1 Sekunde.
Keine Lösung: BP 23.5, BP 24.0.
Wenn Schwarz seinen 25. b3 spielt ist kein Matt in 2 möglich.
Wenn angenommen wird das Weiß aus dieser Stellung nochmals
ziehen darf dann Matt in 2 Zügen.
Notation: 1.Sc3 a5 2.Se4 Sa6 3.b4 a4 4.b5 a3 5.d4 b6 6.d5 Lb7 7.d6 exd6
8.Lf4 Dh4 9.bxa6 Dh3 10.c4 Sf6 11.Sxf6+ gxf6 12.c5 Lf3 13.exf3 Lh6
14.Lb5 c6 15.Kf1 cxb5 16.Se2 dxc5 17.Ld6 Ld2 18.Tg1 La5 19.gxh3 h6
20.Tg5 hxg5 21.Kg2 Th4 22.Db1 Ta4 23.Db4 cxb4 24.Sf4 gxf4 25.Tg1 (2023-04-06)
A.Buchanan: Should the stip be something like:
Position after White’s 25th move.
Can Black play to avoid being mated in 2?
But both b3 and Rc8 seem to let Black escape (2023-04-06)
more ...
comment
Keywords: Castling, Non-Unique Proof Game
Genre: Retro
Computer test: Computerprüfung: C+ Stelvio NUPG cooked 1 Sekunde. Keine Lösung: BP 23.5, BP 24.0.
FEN: r3k3/3p1p2/Pp1B1p2/bp6/rp3p2/p4P1P/P4PKP/6R1
Input: Gerd Wilts, 1995-06-03
Last update: A.Buchanan, 2023-04-06 more...
23 - P0005367
Ted Brandhorst
3500 British Chess Magazine 12/1973
P0005367
(0+0)
BP in which both sides get their pieces all on squares of the same colour?
(AL: 12,5)
1. a3 a5 2. c3 b6 3. d4 d6 4. e3 e5 5. f4 f6 6. g3 g5 7. h4 h6 8. Sd2 Ta7 9. Kf2 Lg7 10. De1 Kf8 11. Lh3 Lxh3 12. Txh3 Se7 13. Th2
play all play one stop play next play all
Hauke Reddmann: Beim Vorfuehren (im Club vor voellig problemunerfahrenen
Patznasen) kam einer auf
folgende Idee:

1.c3 e5 2.a3 Bxa3 3.Nxa3 a5 4.e3 b6 5.f4 d6 6.g3
Ne7 7.h4 f6 8.Bh3 Bxh3 9.Rxh3 Ra7 10.Rh2 Kf8 11.Kf2 h6 12.Qe1

2 Halbzüge gespart! (2002-11-19)
Ryan McCracken: It's possible to do this faster with a good capturing scheme:
1.e3 d6 2.Ba6 Bh3 3.Bxb7 Bxg2 4.Bxa8 Bxh1 5.Be4 Bf3 6.Bxh7 Bxd1 7.Bxg8 Bxc2 8.Nc3 Bb3 9.Bxf7+ Kxf7 10.axb3 Kf6 11.b4 reaching a monochrome position in a mere 10.5 moves. (2004-10-01)
A.Buchanan: I don't think this "cooked". It's not even unsound: just the author's effort to solve a synthetic challenge, and twice the solution has been superseded, that's all. (2020-11-03)
comment
Keywords: Synthetic problem, Superseded by (P1381496), Non-Unique Proof Game, Ornament
Genre: Retro
FEN: 8/8/8/8/8/8/8/8
Input: Gerd Wilts, 1995-06-03
Last update: A.Buchanan, 2020-11-04 more...
24 - P0005382
Günter Büsing
Markus Johannes Ott
Thomas Maeder
Hans-Peter Reich

Andernach 05/1992
2. orthodoxe ehrende Erwähnung
P0005382
(12+14)
Stellung nach dem 13. Zug von Weiß. Wo wurden die fehlenden Steine geschlagen? 2 Lösungen
1. Sf3 a5 2. Sd4 a4 3. Sb3 axb3 4. e4 bxc2 5. Dh5 cxb1=L 6. Dxh7 Lxe4 7. Dh6 Lh7 8. Da6 g6 9. d4 Lg7 10. d5 Ld4 11. Lh6 La7 12. Lf8 b6 13. Dxc8
1. d4 a5 2. Sd2 a4 3. Sb3 axb3 4. Lh6 bxc2 5. e3 c1=L 6. d5 Lxe3 7. Sf3 La7 8. Sg5 b6 9. Sxh7 La6 10. Da4 Ld3 11. Da6 Lxh7 12. Dc8 g6 13. Lxf8
play all play one stop play next play all
: ... Und jedem Anfang wohnt ein Zauber inne, der uns beschützt und der uns hilft zu leben. ... (2003-02-22)
Joost de Heer: This is C+ by Stelvio: 1 exact solution (starting with Sf3) and 1 dualistic cook (starting with 1. d4) (2023-08-02)
comment
Keywords: Non-Unique Proof Game, Where was piece x captured?
Genre: Retro
FEN: rnQqkBnr/b1pppp1b/1p4p1/3P4/8/8/PP3PPP/R3KB1R
Reprints: feenschach 108 10/1993
Input: Gerd Wilts, 1995-06-03
Last update: A.Buchanan, 2012-05-05 more...
25 - P0005590
William Cross
Hans Hofmann
Josef Kutscher
John Niemann
Hansjörg Schiegl
Bernd Ellinghoven

(1) Die Schwalbe 25 02/1974
P0005590
(16+14)
BP in 29,5
1. Sc3 Sh6 2. Se4 Sg8 3. Sg5 Sh6 4. Se6 Sg8 5. Sxf8 Sh6 6. Se6 Sg8 7. Sc5 Sh6 8. Sa4 Sg8 9. Sb6 Sh6 10. Sxc8 Sg8 11. Sb6 Sh6 12. Sa4 Sg8 13. b4 Sh6 14. b5 Sg8 15. b6 Sh6 16. La3 Sg8 17. Db1 Sh6 18. Kd1 Sg8 19. Kc1 Sh6 20. Kb2 Sg8 21. Kc3 Sh6 22. Kd3 Sg8 23. Ke3 Sh6 24. Kf3 Sg8 25. Kg3 Sh6 26. Kh3 Tf8 27. Dd1 Tg8 28. Lc1 Th8 29. Sc3 Sg8 30. Sb1
play all play one stop play next play all
Konstruktionspreisausschreiben 'Die Schwalbe' 06/1973 Heft 21 S. 54,
Thema I (Dr. W. Dittmann):
Konstruiere, ausgehend von der Partieanfangsstellung, durch Versetzung von höchstens vier beliebigen Steinen eine partiemögliche Stellung mit Weiß am Zuge, deren kürzeste Beweispartie möglichst lang ist. Als Steinversetzung gilt die Postierung eines Steins auf einem anderen Feld oder auch die Entfernung eines Steins vom Brett. Gewertet wird nach der (möglichst hohen) Anzahl der Züge, die erforderlich sind, um die eingesandte Stellung von der Grundstellung aus zu erspielen.
Moldenhauer: Computerprüfung: C+ NUPG cooked Stelvio 1.11 1 Sekunde.
Keine Lösung: BP 28.5, BP 29.0.
Notation: 1.Sa3 Sa6 2.Sb5 Tb8 3.Sd4 Ta8 4.Se6 Tb8 5.Sxf8 Ta8 6.Se6 Tb8 7.Sc5 Kf8 8.Sa4 Ke8 9.Sb6 Kf8 10.Sxc8 Ke8 11.Sb6 Kf8 12.Sa4 Ke8 13.Sc3 Kf8 14.b4 Ke8 15.La3 Kf8 16.Db1 Ke8 17.Kd1 Kf8 18.Kc1 Ke8 19.Kb2 Kf8 20.Dd1 Ke8 21.Sb1 Kf8 22.Kc3 Ke8 23.Kd3 Kf8 24.Ke3 Ke8 25.Kf3 Kf8 26.Kg3 Ke8 27.Kh3 Tc8 28.Lc1 Ta8 29.b5 Sb8 30.b6 (2023-04-09)
A.Buchanan: In order to (H)C+ a non-unique proof game, one should show there is no short solution, but also that all solutions of regular length exhibit the intended theme, whatever that was. As long as any strategy can be checked for compliance, Stelvio fine because one can set the parameter for Stelvio to make sure that all strategies are considered. But it’s not possible currently to view all transpositions of a strategy, if that matters (2023-04-09)
Moldenhauer: Man müsste natürlich dieses Konstruktionsausschreiben gelesen haben was hier die Vorgabe war.
Die Stellung an sich oder der Königsmarsch oder dass die Damen und Läufer die Ursprungsposition
wieder einnehmen, usw. Stelvio wird das erreichen der Stellung analysieren so wie Euclide und Natch.
Die Bewertung auf C+ überlasse ich auch den Experten. Da fehlt mir Wissen und jahrelange Erfahrung.
Deshalb nur Kommentare. Gibt es dieses Ausschreiben von 06/1973? (2023-04-27)
Mario Richter: Thema ergänzt - hilft das bei der Bewertung? (2023-04-28)
comment
Keywords: Non-Unique Proof Game, Construction task, Homebase
Genre: Retro
FEN: rn1qk1nr/pppppppp/1P6/8/8/7K/P1PPPPPP/RNBQ1BNR
Input: Gerd Wilts, 1995-06-05
Last update: Mario Richter, 2023-04-28 more...
26 - P0005591
Alfred Gschwend
Jorge Joaquin Lois
Julio Alberto Pancaldo
Pedro Gomez Masia
Emiliano F. Ruth

Die Schwalbe 25 02/1974
P0005591
(16+14)
BP in 29,5
1. Sa3 Sa6 2. Sc4 Tb8 3. Se5 Sh6 4. Sg6 Sg8 5. Sxh8 Sh6 6. Sg6 Sg8 7. Se5 Sh6 8. Sc6 Sg8 9. Sxb8 Sh6 10. Sc6 Sg8 11. Sa5 Sh6 12. Sc4 Sg8 13. b4 Sh6 14. b5 Sg8 15. b6 Sh6 16. La3 Sg8 17. Db1 Sh6 18. Kd1 Sg8 19. Kc1 Sh6 20. Kb2 Sg8 21. Kc3 Sh6 22. Kd3 Sg8 23. Ke3 Sh6 24. Kf3 Sg8 25. Kg3 Sh6 26. Kh3 Sg8 27. Dd1 Sh6 28. Lc1 Sg8 29. Sa3 Sb8 30. Sb1
play all play one stop play next play all
Konstruktionsausschreiben 06/1973
Moldenhauer: Computerprüfung: C+ NUPG Stelvio 1.11 00:07:09 Minuten. (hh:mm:ss)
Keine Lösung: BP 28.5, BP 29.0.
Beispiel: 1.Sa3 Sa6 2.Sb5 Tb8 3.Sd4 Ta8 4.Sc6 Tb8 5.Sxb8 Sb4 6.Sc6 Sa6
7.Se5 Sb4 8.Sg6 Sa6 9.Sxh8 Sb4 10.Sg6 Sa6 11.Se5 Sb4 12.Sc4 Sa6 13.b4 Sb8
14.La3 Sa6 15.Db1 Sb8 16.Kd1 Sa6 17.Kc1 Sb8 18.Kb2 Sa6 19.Kc3 Sb8
20.Kd3 Sa6 21.Ke3 Sb8 22.Kf3 Sa6 23.Kg3 Sb8 24.Kh3 Sa6 25.Dd1 Sb8
26.Lc1 Sa6 27.Sa3 Sb8 28.Sb1 Sa6 29.b5 Sb8 30.b6 (2023-04-24)
comment
Keywords: Construction task, Non-Unique Proof Game
Genre: Retro
FEN: 1nbqkbn1/pppppppp/1P6/8/8/7K/P1PPPPPP/RNBQ1BNR
Input: Gerd Wilts, 1995-06-05
Last update: A.Buchanan, 2012-04-08 more...
27 - P0005593
Hector Guillermo Zucal
Horacio Tomas Amil Meylan

(B) Die Schwalbe 25 02/1974
P0005593
(16+15)
BP in 28.5
1. Sa3 Sa6 2. Sc4 Sb8 3. Se5 Sa6 4. Sc6 Sb8 5. Sxd8 Sa6 6. Sc6 Sb8 7. Se5 Sa6 8. Sc4 Sb8 9. b4 Sa6 10. b5 Sb8 11. b6 Sa6 12. h4 Sb8 13. h5 Sa6 14. h6 Sb8 15. La3 Sa6 16. Db1 Sb8 17. Kd1 Sa6 18. Kc1 Sb8 19. Kb2 Sa6 20. Kc3 Sb8 21. Kd3 Sa6 22. Ke3 Sb8 23. Kf3 Sa6 24. Kg3 Sb8 25. Kh2 Sa6 26. Dd1 Sb8 27. Lc1 Sa6 28. Sa3 Sb8 29. Sb1
play all play one stop play next play all
Konstruktionsausschreiben 06/1973
Moldenhauer: Computerprüfung: Cooked Stelvio 1.11 4 Sekunden.
Keine Lösung: BP 27.5, BP 28.0, BP 29.0. BP 28.5 cooked.
Beispiel BP 29.5: 1.Sa3 Sa6 2.Sb5 Tb8 3.Sd4 Ta8 4.Sc6 Tb8 5.Sxd8 Ta8 6.Sc6 Tb8 7.Sa5 Kd8 8.Sc4 Ke8
9.b4 Kd8 10.La3 Ke8 11.Db1 Kd8 12.Kd1 Ke8 13.Kc1 Kd8 14.Kb2 Ke8 15.Kc3 Kd8 16.Kd3 Ke8 17.Ke3 Kd8
18.Kf3 Ke8 19.Kg3 Kd8 20.Dd1 Ke8 21.Lc1 Kd8 22.Sa3 Ke8 23.Sb1 Kd8 24.b5 Ke8 25.b6 Kd8 26.h4 Ke8
27.Kh2 Ta8 28.h5 Sb8 29.h6
Beispiel BP 28.5: 1.Sa3 Sa6 2.Sb5 Tb8 3.Sd4 Ta8 4.Sc6 Tb8 5.Sxd8 Ta8 6.Sc6 Tb8 7.Sa5 Kd8 8.Sc4 Ke8
9.b4 Kd8 10.La3 Ke8 11.Db1 Kd8 12.Kd1 Ke8 13.Kc1 Kd8 14.Kb2 Ke8 15.Kc3 Kd8 16.Kd3 Ke8 17.Ke3 Kd8
18.Kf3 Ke8 19.Kg3 Kd8 20.Dd1 Ke8 21.Lc1 Kd8 22.Sa3 Ke8 23.Sb1 Kd8 24.b5 Ke8 25.b6 Kd8 26.h4 Ke8
27.h5 Ta8 28.Kh2 Sb8 29.h6
Nach Konstruktionsauschreiben glaube ich wäre BP 28.5 richtig. (2023-05-12)
James Malcom: Fixed. (2023-05-13)
Henrik Juel: What was asked for in this construction tourney? (2023-05-13)
Moldenhauer: Bitte siehe P0005590, da gings schon mal darum. (2023-05-13)
comment
Keywords: Non-Unique Proof Game, Construction task, Homebase
Genre: Retro
FEN: rnb1kbnr/pppppppp/1P5P/8/8/8/P1PPPPPK/RNBQ1BNR
Input: Gerd Wilts, 1995-06-05
Last update: James Malcom, 2023-05-13 more...
28 - P0005597
Frank Schützhold
Jorge Abel Barros
Raul Ocampo
Jorge Joaquin Lois
Julio Alberto Pancaldo

(2) Die Schwalbe 25 02/1974
P0005597
(15+15)
BP in 28,5
(27,5?)
1. Sc3 Sh6 2. Sd5 Tg8 3. b4 Sc6 4. b5 Sb8 5. b6 Sc6 6. La3 Sb8 7. Db1 Sc6 8. Db5 Sb8 9. Da6 bxa6 10. Kd1 Lb7 11. Kc1 Dc8 12. Sf6+ Kd8 13. Sxg8 Sc6 14. Sf6 Sg8 15. Sd5 Ke8 16. Kb2 Dd8 17. Kc3 Lc8 18. b7 Sh6 19. b8=D Sg8 20. Db1 Sh6 21. Dd1 Sg8 22. Lc1 Sh6 23. Kd3 Sg8 24. Ke3 Sh6 25. Kf3 Sg8 26. Kg3 Sh6 27. Kh3 Sg8 28. Sc3 Sb8 29. Sb1
play all play one stop play next play all
Konstruktionsausschreiben 06/1973
Moldenhauer: Computerprüfung: C+ NUPG BP 28.5 cooked in 1 Sekunde.
Keine Lösung: BP 26.5 bis BP 28.0.
Beispiel: 1.Sc3 Sa6 2.Sd5 Tb8 3.b4 Ta8 4.La3 Tb8 5.Db1 Ta8 6.Kd1 Tb8 7.Kc1 Ta8
8.Kb2 Tb8 9.Kc3 Ta8 10.Kd3 Tb8 11.Ke3 Ta8 12.Kf3 Tb8 13.Kg3 Ta8
14.Kh3 Tb8 15.b5 Ta8 16.b6 Sb8 17.Db5 Sc6 18.Da6 bxa6 19.b7 Sh6
20.b8D Tg8 21.Db1 Lb7 22.Dd1 Dc8 23.Sf6+ Kd8 24.Sxg8 Sb8 25.Sf6 Sg8
26.Sd5 Ke8 27.Lc1 Dd8 28.Sc3 Lc8 29.Sb1 (2023-04-02)
comment
Keywords: Non-Unique Proof Game, Construction task, Promotion
Genre: Retro
FEN: rnbqkbn1/p1pppppp/p7/8/8/7K/P1PPPPPP/RNBQ1BNR
Input: Gerd Wilts, 1995-06-05
Last update: A.Buchanan, 2012-04-08 more...
29 - P0005890
Gottfried Göller
43 150 Schachkuriositäten 1910
P0005890
(12+12)
BP in 18,0
1. Sh3 Sh6 2. Sf4 Sf5 3. Sg6 Sg3 4. Sxh8 Sxh1 5. Sg6 Sg3 6. Sxf8 Sxf1 7. Sg6 Sg3 8. Se5 Se4 9. Sc4 Sc5 10. Sb6 Sb3 11. Sxa8 Sxa1 12. Sb6 Sb3 13. Sxc8 Sxc1 14. Sb6 Sb3 15. Sc4 Sc5 16. Se5 Se4 17. Sf3 Sf6 18. Sg1 Sg8
play all play one stop play next play all
Frank Müller: Originalforderung: In wieviel Zügen läßt sich vorstehende Position aus normaler Anfangsstellung entwickeln?
Eine Zugzahl war nicht angegeben! (2012-08-11)
Moldenhauer: Computerprüfung: Cooked Stelvio 2.0 in 1 Sek.
Keine Lösung: BP 17.0, BP 17.5.
C+ wegen der Forderung.

1.Sa3 Sa6 2.Sb5 Sc5 3.Sd4 Se4 4.Se6 Sg3 5.Sxf8 Sxh1 6.Sg6 Sg3 7.Sxh8 Sxf1
8.Sg6 Se3 9.Se5 Sf5 10.Sc4 Sd4 11.Sb6 Sb3 12.Sxa8 Sxa1 13.Sb6 Sb3
14.Sxc8 Sxc1 15.Sb6 Sb3 16.Sa4 Sd4 17.Sc3 Sc6 18.Sb1 Sb8 (2024-01-09)
A.Buchanan: If the composer makes no claim that the solution is unique, it’s unfair to call it “cooked” when multiple solutions are unearthed. “Cooked” means “Kaput”, “broken”. Please stop. (2024-01-09)
comment
Keywords: Non-Unique Proof Game
Genre: Retro
FEN: 1n1qk1n1/pppppppp/8/8/8/8/PPPPPPPP/1N1QK1N1
Input: Gerd Wilts, 1995-06-26
Last update: Frank Müller, 2012-08-11 more...
30 - P0005899
Unto Heinonen
Suomen Tehtäväniekat 02/1993
1. Lob
P0005899
(7+7)
BP in 30,5
1. h4 g5 2. hxg5 a5 3. b4 axb4 4. Th4 Ta3 5. Sf3 Te3 6. a4 Sf6 7. gxf6 e5 8. Tc4 h5 9. a5 h4 10. a6 h3 11. a7 h2 12. a8=L h1=L 13. Ta6 Th6 14. dxe3 Le7 15. Te6 fxe6 16. La3 b3 17. Lc5 Sc6 18. Sd4 exd4 19. Sc3 dxc3 20. g4 Se5 21. Lg2 b6 22. Lac6 dxc6 23. fxe7 Dd3 24. Ld5 exd5 25. cxd3 Lf5 26. gxf5 Te6 27. fxe6 Le4 28. dxe4 bxc5 29. f4 dxc4 30. Dc2 bxc2 31. fxe5
play all play one stop play next play all
Juha Saukkola:: Solution not unique! (2000-09-29)
Moldenhauer: Computerprüfung: C+ NUPG Stelvio 1.11 00:02:12 Minuten. (hh:mm:ss)
Keine Lösung: BP 29.5, BP 30.0. (2023-04-24)
Moldenhauer: Beispiel Stelvio 1.11: 1.Sc3 Sc6 2.b3 Sf6 3.La3 a5 4.g4 a4 5.Lg2 Ta5 6.h4 Tf5
7.Lc5 axb3 8.Ld5 b6 9.a4 bxc5 10.gxf5 g5 11.hxg5 e5 12.Th4 h5 13.Tc4 h4
14.a5 h3 15.a6 h2 16.a7 h1D 17.Ta6 De4 18.Sf3 Le7 19.Sd4 exd4 20.a8D Se5
21.Te6 dxc3 22.Dc6 dxc6 23.d4 fxe6 24.dxe5 exd5 25.gxf6 Le6
26.fxe6 dxc4 27.fxe7 Ddd3 28.cxd3 Th3 29.Dc2 Te3 30.dxe4 bxc2 31.fxe3 (2023-04-24)
comment
Keywords: Non-Unique Proof Game, Promotion
Genre: Retro
FEN: 4k3/2p1P3/2p1P3/2p1P3/2p1P3/2p1P3/2p1P3/4K3
Reprints: The Problemist 11/1993
Input: Gerd Wilts, 1995-06-26
Last update: A.Buchanan, 2012-04-10 more...
31 - P0005994
Paul Buerke
Karl Fabel

180 FEENSCHACH 19 04/1950
P0005994
(15+16)
Welches waren die letzten beiden Einzelzüge? Wie lang ist die KBP?
R: 1. c6xBd5+ d4-d5+
SPG has 10 single moves, but not unique (8 paths)
play all play one stop play next play all
A.Buchanan: This is an earliest position in which the last two moves can be determined. (2021-06-29)
more ...
comment
Keywords: Non-Unique Proof Game, Last Moves?, Type C
Genre: Retro
FEN: rnbq1bnr/pp2pppp/3pk3/3p4/4K3/8/PPP1PPPP/RNBQ1BNR
Input: Gerd Wilts, 1995-07-15
Last update: A.Buchanan, 2021-06-29 more...
32 - P0006162
Eric Angelini
3240 diagrammes 112 01-03/1995
P0006162
(7+16)
BP in 23,0
Wo und durch wen wurde der wLf1 geschlagen?
1. f4 h6 2. f5 Th7 3. f6 exf6 4. d4 Sa6 5. d5 c6 6. d6 Lxd6 7. g4 Lc7 8. h4 d6 9. h5 Lxg4 10. Lh3 Lxh5 11. Lc8 Se7 12. e4 Sf5 13. e5 Ke7 14. e6 fxe6 15. c4 Lf7 16. c5 Sxc5 17. b4 g6 18. b5 Sg7 19. b6 axb6 20. a4 Dd7 21. a5 Ta7 22. a6 bxa6 23. Lb7 Sxb7
play all play one stop play next play all
Moldenhauer: Computerprüfung: C+ da NUPG Stelvio 1.11 47 Sekunden.
Keine Lösung: BP22.0, BP 22.5.
Auf b7 wird der wLf1 durch Sb8 der auf später auf c5 steht geschlagen. (2023-03-28)
comment
Keywords: Non-Unique Proof Game
Genre: Retro
FEN: 8/rnbqkbnr/pppppppp/8/8/8/8/RNBQK1NR
Input: Gerd Wilts, 1995-07-19
Last update: A.Buchanan, 2012-04-08 more...
33 - P0008762
Alexander Kislyak
7093 feenschach 122 12/1996
M. Caillaud und A. Frolkin zum 40. Geburtstag gewidmet
P0008762
(12+10)
BP in 22,5
1. b4 c5 2. Lb2 c4 3. Lxg7 c3 4. e3 e5 5. Lc4 Dh4 6. Sf3 Se7 7. 0-0 cxd2 8. c3 b6 9. Da4 Lb7 9. Da4 Lb7 10. Dxa7 h6 11. Le6 dxe6 12. Sa3 Kd7 13. Sc2 Kc6 14. Dxb8 Ta3 15. Kh1 Kb5 16. Tg1 Ka4 17. Lxf8 Dxf2 18. h4 Tg8 19. Scd4 Tg3 20. b5 Th3+ 21. gxh3 Tb3 22. Tg6 fxg6 23. axb3#
12 verschiedene erste Bauernzüge
play all play one stop play next play all
Moldenhauer: Computerprüfung: C+ da NUPG Stelvio 1.11 08:07:40 Stunden. (hh:mm:ss)
Keine Lösung: BP 21.5, BP 22.0.
Beispiel: 1.Sa3 b6 2.Sf3 Lb7 3.b4 c5 4.Lb2 c4 5.Lxg7 c3 6.Lxf8 e5 7.e3 Dh4
8.Lc4 Se7 9.0–0 Dxf2+ 10.Kh1 Tg8 11.Le6 cxd2 12.c3 Tg3 13.Da4 h6
14.Dxa7 dxe6 15.Dxb8+ Kd7 16.Tg1 Kc6 17.Sc2 Kb5 18.h4 Ta3
19.Scd4+ Ka4 20.b5 Th3+ 21.gxh3 Tb3 22.Tg6 fxg6 23.axb3# (2023-03-28)
comment
Keywords: Non-Unique Proof Game
Genre: Retro
FEN: 1Q3B2/1b2n3/1p2p1pp/1P2p3/k2N3P/1PP1PN1P/3p1q2/R6K
Input: Gerd Wilts, 1997-06-15
Last update: A.Buchanan, 2014-05-21 more...
34 - P0008784
Niels Høeg
The Chess Amateur 07/1926
P0008784
(1+1)
Längste BP ohne Schach. Welches war der letzte Zug?
R: 5899. Kg2xTh1
play all play one stop play next play all
The game ends after 50 consecutive moves without captures or pawn moves (loss of castling right is not included here), or when there is not enough material to mate (say K-K or K-KS). There are 30 captures and 96 pawn moves (including 8 pawn captures) available, so the longest game seems to last (30+96-8)x50=5900 moves. This cannot be achieved because of the move-loss when the draw-preventing move shifts between white and black. Niels Høeg believed that 2 moves were lost and stated the solution as 5898.- Kb7xTa8. Karl Fabel later showed that only 1.5 moves need be lost.

Since 1926, there have been some relevant innovations to rules and conventions
(1) 50 move rule applies only to retro compositions, and will trigger automatically (no issue with writing down the move). (Codex 1953?)
(2) Removal of rules about draw by insufficient material (Laws 1997)
(3) Dead position rule introduced (Laws 1997)
(4) 75 move rule introduced (Laws 2014)
(5) Dead position rule applies only to retro compositions (Codex 2015)
(6) Articles 9.2 & 9.3 apply to chess problems - this includes 50 move rule and excludes 75 move rule (Codex 2019)

This is certainly a composition rather than a question about over the board chess. And it is certainly a retro composition. So the 50 move rule will dominate the 75 rule. The standard interpretation of interaction between 50 move rule and Dead Position in compositions is that Dead Position assessment *is* aware of looming automatic draw by 50 moves. (Note there is a similar assessment for interaction between Dead Position and Draw by Repetition.)

So we can argue that the game cannot last to 5898.5 moves, because the final move leads to a mandatory draw: either the king captures the last officer, or the king avoids the capture and the game ends in draw under the 50 move rule. So the position is dead at 5898.0. But even 5898.0 is too long for the diagram position with the kings so far apart. In the alternate reality if the last capture of a rook does not take place, there must be sufficient moves left for the kings to come together so that the rook can deliver checkmate. This will take at least 6.0 moves.

There is also still an ambiguity in the rules as to whether checkmate overrides draw by 50 moves. This is explicitly mentioned in the 75 move rule, but not in 50 move rule. I assume that checkmate *does* take priority.

Or does a valid problem only exist in the context of the rules and conventions that pertained at the time of its composition? The Codex does not opine on this general point.

Compare P1331022

Duplicate Diagram: P1101148, P1189676, P1191185, P1304589

A.Buchanan: There's a question whether DP rule has visibility of 3Rep & 50M state. The current consensus among most of the tiny group who might care is that for retros, it does have visibility, but for purely forward problems, it does not. This align with the idea that by default 50M & DP rules apply only to retros (2023-09-06)
A.Buchanan: The old intended interpretation is protected under the Golden Age principle. Suppose we do apply modern rules, codex & clarifications. If Black just played Kb7xRa8, then the alternative leading to mate takes 7.0 moves, so this must have been Black's 5892nd move at the latest. If White just moved, then it was White's 5892nd at latest. So to maximize the length of the game, Black moved last. (2023-09-06) edit (2023-09-06)
more ...
comment
Keywords: Longest Proof Game, Last Move?, only Kings, Non-Unique Proof Game, Dead Position, 50 move rule, Constrained problem, Type A, Miniature, Golden Age (pre-dead), Aristocrat
Genre: Mathematics, Retro
FEN: k7/8/8/8/8/8/8/7K
Reprints: Schackproblemet 1928
Schach und Zahl 1966
Input: Gerd Wilts, 1997-06-20
Last update: A.Buchanan, 2024-01-18 more...
35 - P1000051
Paul Raican
7883 Thema Danicum 10/1999
nach Loyd
P1000051
(1+1)
Länge der KBP?
b) Anti-Andernachschach
a) 17.0 Züge, siehe P0001931 .
b) 17.0
play all play one stop play next play all

Duplicate Diagram: P0001931, P1013058, P1184221

P.R.: Sol.b) 17 moves: 1.d4=bP d6=wP 2.Qxd4 Qxd6 3.Qxa7 Qxh2 4.Qxb8 Qxg2 5.Rxh7 Rxa2 6.Rxh8 Rxb2 7.Rxg8 Rxc2 8.Rxg7 Rxc1+ 9.Kd2 Rxb1 10.Qxb7 Bxb7 11.Rxb1 Qxg1 12.Rxf7 Qxf1 13.Rxf8+ Kxf8 14.Rxb7 Qxf2 15.Rxc7 Qxe2+ 16.Kxe2 Kf7 17.Rxe7+ Kxe7. (2006-06-02)
paul: Jacobi found many PGS in 16.5 moves for b): 1.Sc3=b c6=w 2.cxb7 Sxa2 3.bxc8=S Sxc1 4.Rxa7 Qxc8 5.Rxd7 Qxc2 6.Qxc2 Sxe2 7.Qxh7 Kxd7 8.Qxg8 Rxh2 9.Sxe2 Rxg2 10.Qxf8 Rxf2 11.Qxb8 Rxf1+ 12.Rxf1 Rxb8 13.Rxf7 Rxb2 14.Kf1 Rxd2 15.Rxg7 Rxe2 16.Rxe7+ Kxe7 17.Kxe2 (2022-05-27)
paul: And also in 16 moves only: b) 1.a3=b axb2 2.Rxa7 bxc1=R 3.Rxb7 Rxb1 4.Qxb1 d6=w 5.Rxc7 Qxc7 6.dxe7 Qxh2 7.Qxb8 Qxg2 8.Rxh7 Qxg1 9.Qxc8+ Rxc8 10.Rxh8 Rxc2 11.Rxg8 Rxd2 12.Kxd2 Qxf2 13.Rxg7 Qxf1 14.Rxf7 Qxe2+ 15.Kxe2 Bxe7 16.Rxe7+ Kxe7 (2022-05-27)
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comment
Keywords: Anti-Andernach Chess, Non-Unique Proof Game, only Kings
Genre: Retro, Fairies
FEN: 8/4k3/8/8/8/8/4K3/8
Input: Gerd Wilts, 2000-07-31
Last update: A.Buchanan, 2019-02-04 more...
36 - P1012018
Ted Brandhorst
British Chess Magazine 1973
P1012018
(12+12)
BP in 38.0
1. g4 h5 2. Lg2 h4 3. e4 h3 4. Se2 hxg2 5. h4 f5 6. h5 f4 7. h6 f3 8. Th4 fxe2 9. a4 b5 10. a5 Lb7 11. a6 g5 12. axb7 a5 13. b4 a4 14. d4 Ta5 15. f4 gxh4 16. f5 h3 17. f6 h2 18. g5 a3 19. g6 a2 20. g7 Kf7 21. Lf4 Kg6 22. Kf2 e5 23. bxa5 exf4 24. a6 f3 25. Kg3 f2 26. c4 b4 27. c5 b3 28. c6 d5 29. h7 Sd7 30. cxd7 c5 31. f7 c4 32. e5 Lc5 33. e6 b2 34. e7 c3 35. dxc5 c2 36. c6 d4 37. c7 d3 38. a7 d2
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No. 1128 HN
Paulo Roque: cooked:
1.a4 b5 2.a5 Bb7 3.a6 d5 4.axb7 a5 5.b4 a4 6.c4 a3 7.c5 a2 8.c6 Ra5 9.bxa5 b4 10.a6 b3 11.a7 b2 12.d4 Nd7 13.e4 f5 14.Ne2 f4 15.g4 f3 16.Bg2 fxe2 17.f4 e5 18.Kf2 h5 19.f5 h4 20.Bf4 exf4 21.e5 h3 22.f6 hxg2 23.h4 f3 24.h5 g5 25.Rh4 gxh4 26.g5 h3 27.Kg3 f2 28.g6 h2 29.g7 Kf7 30.cxd7 c5 31.h6 c4 32.e6+ Kg6 33.f7 c3 34.h7 Bc5 35.dxc5 c2 36.c6 d4 37.c7 d3 38.e7 d2
[Euclide 0.93, c2000-2002 Ã?tienne Dupuis, 10.11 seconds] (2008-11-04)
Paulo Roque: My commentary of 2008/11/4 is wrong.
There is no cook in the problem.
Analyzing the solution of Euclide note that it is permitted in proofgame. (2008-12-18)
Moldenhauer: Computerprüfung: C+ NUPG Stelvio 1.11 00:03:16 Minuten. (hh:mm:ss)
Keine Lösung: BP 37.0, BP 37.5. (2023-04-24)
comment
Keywords: Non-Unique Proof Game
Genre: Retro
FEN: 3q2nr/PPPPPPPP/6k1/8/8/6K1/pppppppp/RN1Q4
Input: Henri Nouguier, 2004-01-11
Last update: James Malcom, 2021-02-25 more...
37 - P1012128
George Peter Jelliss
The Problemist 1982
P1012128
(7+7)
BP in 31.5
1. g4 b5 2. a4 h5 3. axb5 hxg4 4. b3 g6 5. La3 Lh6 6. Ld6 Le3 7. fxe3 cxd6 8. Ta4 Th5 9. Tf4 Tc5 10. b4 g5 11. bxc5 gxf4 12. h4 a5 13. h5 a4 14. h6 a3 15. h7 a2 16. h8=D a1=L 17. De5 Ld4 18. exd4 dxe5 19. Th3 Ta3 20. Te3 Td3 21. Sf3 Sc6 22. bxc6 gxf3 23. Lh3 fxe3 24. Le6 dxe6 25. exd3 Dd6 26. Sc3 Sf6 27. Se4 Sd5 28. c4 f5 29. De2 Ld7 30. cxd5 fxe4 31. cxd6 fxe2 32. cxd7+
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No. 1462 HN
Moldenhauer: Computerprüfung: C+ NUPG Stelvio 1.11 00:05:52 Minuten. (hh:mm:ss)
Keine Lösung: BP 30.5, BP 31.0.
Beispiel: 1.Sc3 Sf6 2.a4 Sd5 3.b4 b5 4.Lb2 c5 5.axb5 h5 6.g4 hxg4 7.Ta6 Th3 8.Tf6 Td3 9.exd3 Sc6 10.bxc6 a5 11.h4 a4 12.h5 Ta5 13.h6 a3 14.h7 gxf6 15.h8D f5 16.Dd4 Lh6 17.Th3 Le3 18.fxe3 a2 19.e4 a1D 20.Te3 cxd4 21.Lh3 Tc5 22.bxc5 dxe3 23.exd5 d6 24.Se4 fxe4 25.Le5 Dd4 26.Df3 dxe5 27.Se2 Dd6 28.cxd6 Ld7 29.c3 gxf3 30.Le6 fxe6 31.cxd4 fxe2 32.cxd7+ (2023-04-24)
comment
Keywords: Non-Unique Proof Game, Ornament, Kindergarten Problem
Genre: Retro
FEN: 4k3/3Pp3/3Pp3/3Pp3/3Pp3/3Pp3/3Pp3/4K3
Input: Henri Nouguier, 2004-01-11
Last update: James Malcom, 2021-02-25 more...
38 - P1012136
Jexon J. Secker
The Problemist 1982
P1012136
(9+15) C+
Non-unique BP in 12,0
1. g4 g5 2. Lg2 e5 3. Lxb7 Lxb7 4. a4 Lxh1 5. e4 Lb4 6. a5 c5 7. a6 Da5 8. c4 Dxa1 9. Sc3 Dxc1 10. b3 Dxc3 11. Sh3 Dxh3 12. Df3 Lxf3=
Weiß ist patt.
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No. 1473 HN
A.Buchanan: This is not intended to be a unique proof game, so is not cooked (2023-03-02)
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comment
Keywords: Non-Unique Proof Game
Genre: Retro
Computer test: Computerprüfung: Stelvio 1.0 cooked in 1 Sekunde. Natch 3.3 64 Lösungen in 4 Sekunden. Da NUPG C+ Stelvio 1.0, Natch 3.3.
FEN: rn2k1nr/p2p1p1p/P7/2p1p1p1/1bP1P1P1/1P3b1q/3P1P1P/4K3
Input: Henri Nouguier, 2004-01-11
Last update: A.Buchanan, 2023-03-02 more...
39 - P1012896
Helmut Pönitz
Die Schwalbe 1935
P1012896
(16+15)
Stellung nach dem 9. Zug von Weiß. Welches war der letzte Zug?
1. f4 Sa6 2. f5 Sc5 3. g4 Sa4 4. Lh3 Sc3 5. dxc3 a5 6. Lh6 Ta6 7. g5 Tc6 8. Lg4 Tg6 9. f6 is one of 210 possible proof games
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No. 790 HN
Kees: 1. f4 Na6 2. f5 Nc5 3. g4 Na4 4. Bh3 Nc3 5. dxc3 a5 6. Bh6 Ra6 7. g5 Rc6 8.
Bg4 Rg6 9. f6 * (2022-02-12)
Henrik Juel: We are told that White made last move, so the type is really B
But it also seems correct as a type A problem (2022-02-12)
A.Buchanan: Whatever the stipulation that we have ended up with here in PDB, it's clear that effort was expended by the composer to ensure that the problem functions as a Type A, so let's credit him with that :-) (2022-02-13)
comment
Keywords: Non-Unique Proof Game, Last Move?, Type A
Genre: Retro
FEN: 2bqkbnr/1ppppppp/5PrB/p5P1/6B1/2P5/PPP1P2P/RN1QK1NR
Input: Henri Nouguier, 2004-01-11
Last update: A.Buchanan, 2022-02-13 more...
40 - P1012897
Thomas R. Dawson
Die Schwalbe 1935
P1012897
(16+15)
Stellung nach dem 10. Zug von Schwarz. Mit Weiss am zug, welches war der letzte Zug?
Beispielauflösung:
R: 1. ... f7-f5 2. Ke4-e5 Sg6-h8 3. Lf1-a6 Sh4-g6 4. Kd3-e4 Sf5-h4 5. Ke2-d3 Sh6-f5 6. h4xTg5 Tg6-g5 7. e5-e6 Sg8-h6 8. e4-e5 Th6-g6 9. Ke1-e2 Th8-h6 10. e2-e4 h7-h5 11. h2-h4
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zuletzt kann nur R: 1. ... f7-f5 geschehen sein, nicht R: 1. ... h6-h5,h7-h5??, denn dann hätte der sTh8, der auf g3,g4 oder g5 vom wBh2 geschlagen wurde, nicht auf das Schlagfeld gelangen können.
No. 791 HN
Kees: 1. h4 h5 2. e4 Rh6 3. e5 Rg6 4. e6 Rg5 5. hxg5 Nh6 6. Ke2 Ng4 7. Kf3 Ne5+
8. Ke4 Ng6 9. Ba6 Nh8 10. Ke5 f5 * (2022-02-12)
comment
Keywords: Last Move?, Non-Unique Proof Game, Type B
Genre: Retro
FEN: rnbqkb1n/ppppp1p1/B3P3/4KpPp/8/8/PPPP1PP1/RNBQ2NR
Input: Henri Nouguier, 2004-01-11
Last update: Mario Richter, 2022-02-13 more...
41 - 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+
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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...
42 - P1013009
Olavi Arvid Riihimaa
Die Schwalbe 1960
P1013009
(14+14)
KBP?
D'abord, un CN prend FBf1. Ensuite, la DB est allée se faire prendre par le PNg7 en f6 pour laisser sortir le FNf8. Ce FN se fait prendre par le PBa en b4 ou b6, puis la TNa se fait prendre à son tour en a7 par le PBb6. Ce PB se promouvoit alors en a8 en dame et cette dame revient en d1!

Beispiel-BP (mri):
1. Sh3 Sh6 2. Sg1 Sf5 3. Sh3 Sg3 4. Sg1 Sxf1 5. h3 Sh2 6. Sf3 Sg4 7. Kf1 Sf6 8. Kg1 Se4 9. Kh2 Sf6 10. Kg3 Sg4 11. Dg1 Sf6 12. Dh2 Sg8 13. Kg4 a6 14. De5 Ta7 15. Df6 gxf6 16. a4 Lh6 17. a5 Le3 18. Kh4 Lb6 19. axb6 Kf8 20. bxa7 Ke8 21. a8=D Kf8 22. Da7 Ke8 23. Db6 Kf8 24. Dd6 Ke8 25. Dh2 Kf8 26. Dg1 Ke8 27. Dd1 Kf8 28. Kg3 Ke8 29. Kh2 Kf8 30. Kg1 Ke8 31. Kf1 Kf8 32. Sg1 Ke8 33. Ke1
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No. 963 HN
Moldenhauer: Wie kommt der Bh2 nach h3? Der Läufer und der Turm wurden wegen der UW geschlagen.
Diagrammfehler? (2023-06-15)
Moldenhauer: Natürlich wie kommt der Bh2 nach g3! (2023-06-15)
A.Buchanan: Not in WinChloe (2023-06-15)
Mario Richter: Moldenhauers Freudscher Verschreiber weist ja schon die Richtung: der wBg3 gehört offensichtlich nach h3. Habe die Stellung entsprechend geändert. (2023-06-16)
comment
Keywords: Non-Unique Proof Game
Genre: Retro
FEN: 1nbqk1nr/1ppppp1p/p4p2/8/8/7P/1PPPPPP1/RNBQK1NR
Input: Henri Nouguier, 2004-01-11
Last update: Mario Richter, 2023-06-16 more...
43 - P1068119
Etienne Dupuis
Alfred Gschwend

(4) Die Schwalbe 215 10/2005
P1068119
(16+16)
2w + 2s Steine auf 18 Strecken: BP in 22,0
1. e4 d5 2. La6 Lh3 3. g4 b5 4. Lc8 Lf1 5. d3 e6 6. a4 h5 7. a5 h4 8. a6 h3
9. Ta5 La3 10. b4 Th4 11. Lh6 Sc6 12. Sd2 g5 13. Lf8 Sd4 14. Da1 Sb3 15.
Dg7 Lc1 16. Sgf3 d4 17. Se5 Dd5 18. Sd7 Sf6 19. e5 Dg2 20. Sc4 Se4 21. Scb6
Sed2 22. f3 f6
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Schwalbe TT194
Thema III (J. Haas)
Konstruiere eine legale Stellung mit 32 Steinen, in der auf jeder Linie, jeder Reihe und auf den beiden längsten Diagonalen je zwei weiße und zwei schwarze Steine stehen.
Zur Erläuterung: Es sollen demnach in der Stellung auf 18 Strecken (auf den 8 Linien, den 8 Reihen und den 2 Diagonalen: a1-h8 und a8-h1) jeweils 2 weiße und 2 schwarze Steine (= 4 Steine) stehen.
Das Rekordkriterium: Die Beweispartie für diese Stellung soll möglichst kurz sein; es kommt dabei nicht auf die Reihenfolge, sondern nur auf die Anzahl der Züge an.
Gewertet wird nach der möglichst geringen Zügezahl der vom Einsender angegebenen Beweispartie.
hans: 1. e4 d5 2. Ba6 Bh3 3. g4 b5 4. Bc8 Bf1 5. d3 e6 6. a4 h5 7. a5 h4 8. a6 h3
9. Ra5 Ba3 10. b4 Rh4 11. Bh6 Nc6 12. Nd2 g5 13. Bf8 Nd4 14. Qa1 Nb3 15.
Qg7 Bc1 16. Ngf3 d4 17. Ne5 Qd5 18. Nd7 Nf6 19. e5 Qg2 20. Nc4 Ne4 21. Ncb6
Ned2 22. f3 f6
This is a possibility, but I don’t understand the condition (2012-06-12)
Henrik Juel: The construction task seems to be one for the composers, not the solvers: There are two white and two black men on each row, each file, and each main diagonal (8+8+2=18).
The proof game is not unique (2012-06-12)
Moldenhauer: Computerprüfung: C+ Stelvio 1.11 da NUPG. Das Problem ist cooked 1 Sekunde.
Keine Lösung: BP 20 - 21.5.
Beispiellösung: 1. Sf3 Sc6 2. a4 Sd4 3. a5 d5 4. e4 Lh3 5. La6 b5 6. Lc8 e6
7. a6 h5 8. Ta5 La3 9. b4 Sb3 10. d3 h4 11. Lh6 g5 12. g4 Lf1 13. Lf8 h3
14. Sbd2 Th4 15. Da1 Lc1 16. Dg7 d4 17. Se5 Dd5 18. Sd7 Sf6 19. e5 Dg2
20. Sc4 Se4 21. Scb6 Sed2 22. f3 f6 (2023-03-22)
A.Buchanan: This isn't cooked because it's not attempting to have a unique proof game. It's worth checking that actual stipulation in the magazine, Databases often, with the best of intents, end up with inaccurate stipulations, in order to communicate with solvers or allow for engine or animation to operate as wished (2023-03-23)
comment
Keywords: Construction task, Non-Unique Proof Game
Genre: Retro
FEN: r1B1kB2/p1pN2Q1/PN2pp2/Rp2P1p1/1P1p2Pr/1n1P1P1p/2Pn2qP/2b1Kb1R
Input: Gerd Wilts, 2005-11-05
Last update: Alfred Pfeiffer, 2014-10-29 more...
44 - P1068120
Olli Heimo
(5) Die Schwalbe 215 10/2005
P1068120
(16+16)
2w +2s Steine auf 18 Strecken: BP in 22,0
Moldenhauer: Computerprüfung: Stellung cooked, Stelvio in 1 Sekunde.
Keine Lösung: BP 21.0, BP 21.5.
Forderung: 2w + 2s Steine auf 8 Reihen, 8 Linien, 2 großen Diagonalen
wurde erfüllt. Forderung kann man in Stelvio 1.11 nicht als Kriterium vorgeben.
Ich dachte zuerst die Springerzüge 6s + 6w a 3 Felder waren gemeint.
Beispiel Kurznotation mit Fritz17 erstellt:
1.Sa3 Sa6 2.Sc4 b5 3.Sb6 e5 4.c4 La3 5.b4 Sc5 6.d4 a5 7.Lg5 Lc1 8.g3 a4
9.h4 a3 10.h5 Ta4 11.h6 d6 12.Th5 Lf5 13.Lh3 Da8 14.Ld8 Dg2 15.Sf3 Lb1 16.d5 e4 17.Dd4 g5
18.Dg7 Sf6 19.Lc8 Sg4 20.Se5 f6 21.f3 Sf2 22.Sf7 Scd3+
Meiner Meinung nach Forderung erfüllt, es wird eine 2., 3. Lösung nicht ausgeschlossen.
Schachproblem somit C+. (2023-04-30)
comment
Keywords: Non-Unique Proof Game, Construction task, Capture-free
Genre: Retro
FEN: 2BBk2r/2p2NQp/1N1p1p1P/1p1P2pR/rPP1p3/p2n1PP1/P3Pnq1/Rbb1K3
Input: Gerd Wilts, 2005-11-05
Last update: A.Buchanan, 2014-05-30 more...
45 - P1109637
Silvio Baier
Roberto Osorio
Mario Richter
Juha M. Saukkola
Göran Wicklund
Jorge Joaquin Lois

(G) Die Schwalbe 233 10/2008
P1109637
(12+13)
Nach 13,5 Zügen stehen die KK in gegenüberliegenden Eckfeldern
Doppellängstzüger
Joost de Heer: Lots of duals:
1.Sc3 Sa6 2.Sh3 Sf6 3.Sg5 Sd5 4.Se6 Se3 5.Sxf8 Sxd1 6.Se6 Sxb2 7.Sxd8 O-O 8.Sc6 Sc4 9.Ba3 Sxa3 10.O-O-O Sb4 11.Sxe7+ Kh8 12.Sb1 Sxa2+ 13.Kb2 Sc4+ 14.Ka1 (2023-07-16)
comment
Keywords: Maximummer, Non-Unique Proof Game
Genre: Retro, Fairies
FEN: r1b2r1k/ppppNppp/8/8/2n5/8/n1PPPPPP/KN1R1B1R
Input: Gerd Wilts, 2010-07-03
Last update: James Malcom, 2021-08-24 more...
46 - P1342564

Schachzeitung , p. 47, 01/1861
P1342564
(10+11)
KBP?
1. e4 e5 2. Sf3 Sc6 3. Lc4 Lc5 4. 0-0 Sf6 5. d4 exd4 6. e5 d5 7. exf6 dxc4 8. Te1+ Kf8! 9. fxg7+ Kxg7 10. Se5 Te8 11. Dh5 Df6 12. Lh6+ Kg8 13. Sc3 dxc3 14. Sxc6 Txe1+ 15. Txe1 Lf5 16. b4 bxc6 17. bxc5
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Cook: Schnellste NL:
1. Sc3 e5 2. Tb1 Lc5 3. b4 Sh6 4. bxc5 0-0 5. Tb6 Te8 6. Txh6 gxh6 7. d4 exd4 8. Lxh6 Txe2+ 9. Sgxe2 dxc3 10. Sd4 b5 11. Dh5 Sc6 12. Sxc6 dxc6 13. Lc4 bxc4 14. 0-0 Lf5 15. Te1 Df6 (Henrik Juel)
Originalforderung der 'SZ': "Wie läßt sich folgende Position am schnellsten und besten aus der Anfangsstellung des Spieles herleiten?"
Aufgabe dort ohne Autorangabe, nur: "Stellung aus einem wirklichen Spiele."

Vermutlich ein frühes Beispiel für eine Aufgabe, in der explizit nach einer kürzesten Beweispartie gefragt wurde ... (Lösung ebenfalls ohne nähere Angaben zum Autor s. Schachzeitung 02/1862 p.62)
Henrik Juel: Thanks, Alfred; you are welcome to hide my previous comments, as they make little sense now
The original stipulation asked for a proof game, where the position was reached 'am schnellsten und besten', which is far from well defined
One might say that the given game in 16.5 moves is 'good', but the fastest one lasts only 15.0 moves, e.g.,
1.Sc3 e5 2.Tb1 Lc5 3.b4 Sh6 4.bxc5 0-0 5.Tb6 Te8 6.Txh6 gxh6 7.d4 exd4 8.Lxh6 Txe2+ 9.Sgxe2 dxc3 10.Sd4 b5 11.Dh5 Sc6 12.Sxc6 dxc6 13.Lc4 bxc4 14.0-0 Lf5 15.Te1 Df6 (2017-11-02)
Moldenhauer: Computerprüfung: Cooked KBP 15.0 Stelvio 1.0 38 Sekunden.
Keine Lösung: BP 14.5. Cooked BP 15.5, BP 16, BP 16.5, BP 17, BP 17.5
Beispiel: 1.Sc3 Sh6 2.Tb1 e5 3. b4 Lc5 4.bxc5 0-0 5.Tb6 Te8 6.Txh6 gxh6
7.d4 exd4 8.Lxh6 Txe2+ 9.Sgxe2 dxc3 10.Sd4 Df6 11.Dh5 Sc6 12.Lc4 d5
13.0-0 Lf5 14.Te1 dxc4 15.Sxc6 (2023-03-06)
Henrik Juel: Hello Moldenhauer
Your Beispiel seems to be missing 15... bxc6 (2023-03-06)
Moldenhauer: Hello Henrik Juel, Danke für die Korrektur! Hatte ich abgespeichert aber nicht eingegeben. (2023-03-07)
more ...
comment
Keywords: Non-Unique Proof Game
Genre: Retro
FEN: r5k1/p1p2p1p/2p2q1B/2P2b1Q/2p5/2p5/P1P2PPP/4R1K1
Input: Mario Richter, 2017-11-01
Last update: Alfred Pfeiffer, 2017-11-02 more...
47 - P1348600
Andrew Buchanan
chess.stackexchange.com 23/3/2018
P1348600
(12+12) C+
PG in 20.0
1. d4 c5 2. f4 e5 3. f5 d5 4. Lf4 Le6 5. fxe6 exf4 6. e4 f5 7. e5 c4 8. Ld3 Lc5 9. dxc5 cxd3 10. c4 a5 11. b4 a4 12. Db3 axb3 13. a4 b5 14. a5 h5 15. g4 Th6 16. g5 d4 17. gxh6 g5 18. h4 g4 19. Ta4 Dg5 20. hxg5 bxa4 example
play all play one stop play next play all
A shortest game to reach 16 passed pawns
Henrik Juel: Euclide 1.01 confirms that no shorter proof game exists
It seems that the moves are unique, so a challenging part b) suggests itself: How many solutions? (2018-03-27)
A.Buchanan: Thanks, Henrik. Your b) would be challenging indeed! Usually if I make a problem "how many solutions?", the purpose of the problem is to showcase some combinatorial identity, and the play would be structurally simpler.
A different direction is to ask: how many *diagrams* exist that could illustrate the same point: 16 passed pawns in 20.0 moves? I think the answer, including this one, is 12.
Another much harder question is whether one can push the surviving officers around to make a longer but unique proof game. (2018-03-28)
Henrik Juel: 16 passed pawns come in (at least) two varieties
1. A pawn position where all pawns could promote without further captures
2. A pawn position where PxP captures (except possibly ep) are no longer possible
Andrew's definition is probably the latter (2018-03-28)
A.Buchanan: Sorry I don't understand this distinction. (2018-03-28)
Henrik Juel: They are not mutually exclusive, 2 implies 1
Type 1 would apply to your PG, also if the white pawns on the c and e files were lowered to c2,c3 and e2,e3
In type 1 'passed' is interpreted as 'allowing 16 free promotions'; it is equivalent to a game with 8 pawn captures, 1 from each file
To reach type 2, some pawn may have to advance further (2018-03-28)
A.Buchanan: OIC: in the context of playing the game, definition 2 is what counts, because no PxP captures are possible. The only question in people'e minds in stackexchange is whether doubled pawns can count as being passed. The assessment is that they can. (2018-03-28)
Moldenhauer: Computerprüfung: Cooked Diagrammstellung Stelvio 1.31.
Keine Lösung: BP 19.5.
Beispiel: 1. b4 a5 2. d4 a4 3. e4 b5 4. Bd3 c5 5. f4 c4 6. f5 cxd3 7. Bf4 d5
8. c4 e5 9.Qb3 Be6 10. fxe6 Bc5 11. dxc5 axb3 12. a4 d4 13. a5 exf4
14. Ra4 bxa4 15. g4 h5 16. g5 Rh6 17. gxh6 g5 18. e5 g4 19. h4 Qg5 20. hxg5 f5 (2023-06-18)
A.Buchanan: Thanks Moldenhauer. This is "obviously" a non-unique proof game, but there's no syntax in stipulations to distinguish between them. There is also sometimes the notion that a non-unique PG must force some thematic content, but that's not the case here, as the content is visible in the target diagram. So I interpret your Stelvio as C+ for this humble problem. Thanks again. (2023-06-21)
comment
Keywords: Construction record, Non-Unique Proof Game
Genre: Retro
Computer test: Computerprüfung: Non-unique solution Diagrammstellung Stelvio 1.31. Keine Lösung: BP 19.5
FEN: rn2k1n1/8/4P2P/P1P1PpPp/pPPp1pp1/1p1p4/8/1N2K1NR
Input: A.Buchanan, 2018-03-27
Last update: A.Buchanan, 2023-06-21 more...
48 - 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...
49 - P1381496
Ryan McCracken
PDB Website 01/10/2004
P1381496
(0+0)
BP in which both sides get their pieces all on squares of the same colour?
1. e3 d6 2. La6 Lh3 3. Lxb7 Lxg2 4. Lxa8 Lxh1 5. Le4 Lf3 6. Lxh7 Lxd1 7. Lxg8 Lxc2 8. Sc3 Lb3 9. Lxf7+ Kxf7 10. axb3 Kf6 11. b4
play all play one stop play next play all
A.Buchanan: Improves on P0005367 (2020-11-03)
comment
Keywords: Synthetic problem, Non-Unique Proof Game, Ornament, Superseded by (P1381525)
Genre: Retro
FEN: 8/8/8/8/8/8/8/8
Input: A.Buchanan, 2020-11-03
Last update: A.Buchanan, 2020-11-04 more...
50 - 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...
51 - P1399601
Friedrich Burchard
Friedrich Hariuc

feenschach 33, p. 22, 4/1976
P1399601
(10+10)
BP in 48.0
1. e4 f5 2. e5 Sf6 3. exf6 e5 4. g4 e4 5. Se2 e3 6. Sg3 e2 7. h4 f4 8. h5 fxg3 9. h6 g5 10. Th4 gxh4 11. g5 g2 12. g6 Lg7 13. hxg7 g1=D 14. f4 h3 15. f5 h2 16. b4 a5 17. b5 a4 18. b6 a3 19. Lb2 Ta7 20. bxa7 axb2 21. a4 b5 22. a5 b4 23. a6 b3 24. c4 h1=D 25. c5 h5 26. c6 Lb7 27. cxb7 c5 28. d4 c4 29. d5 Sc6 30. dxc6 c3 31. c7 c2 32. c8=D c1=D 33. b8=D Dcc7 34. a8=D d5 35. a7 d4 36. Sc3 dxc3 37. Da6 c2 38. Da8-b7 c1=D 39. a8=D Dhd5 40. gxh8=D+ Kd7 41. g7 bxa1=D 42. g8=D b2 43. f7 b1=D 44. f8=D h4 45. f6 h3 46. f7 h2 47. Dfa3 h1=D 48. f8=D exf1=D+
play all play one stop play next play all
One of the shortest known ways to obtain 18 queens on the board

The challenge was presented in #31 http://problem64.beda.cz/silo/feenschach31_1975.pdf

#33: http://problem64.beda.cz/silo/feenschach33_1976.pdf
James Malcom: Does anyone have any idea why the animation does not work? (2022-03-03)
James Malcom: Thanks for fixing it Mario. (2022-03-04)
A.Buchanan: The animation now rejects any ambiguous move (e.g. Dc7 rather than Dcc7) rather than silently guessing. A good improvement! (2022-03-04)
Mario Richter: The problem here was White's 38. move. There are two Queens that could reach b7 from the a-file, and two Queens, that could reach b7 from the 8th rank. So to make the move unambiguous, James correctly wrote it as Da8b7. Unfortunately, at the moment the PDB-System cannot handle this very special case. As long as this bug is not corrected in the PDB-Software, as a fix one can use long algebraic notation for "problematic" moves. (2022-03-04)
A.Buchanan: @Mario: I'd never thought about what the notation would be for this corner case! You are correct: https://www.chessprogramming.org/Algebraic_Chess_Notation#SAN Ambiguities case 3. I guess this can be earliest encountered with queens or knights at W11, or with bishops at W12 (2022-03-05)
A.Buchanan: Oops: knight is W10. So obv q, can this be done with proof games? (2022-03-05)
A.Buchanan: See P1399677. (2022-03-07)
more ...
comment
Keywords: Non-Unique Proof Game, Move Length Record, Aristocrat, Promotion (x16)
Genre: Retro
FEN: QQ1q1QQQ/1Qqk4/Q7/3q4/8/Q7/8/qqqQKqqq
Input: James Malcom, 2022-03-03
Last update: A.Buchanan, 2022-03-05 more...
52 - P1407174
Noam D. Elkies
Retros mailing list 01/01/2023
P1407174
(16+16) C+
PG in 10.0
How many solutions?
1. e4 e5 2. Ke2 Df6 3. Kd3 Db6 4. h4 d6 5. Th3 Sd7 6. Kc4 Le7 7. Te3 Sf8 8. Kd5 Lf6 9. Lc4 Ld7 10. Se2 Se7# for example
play all play one stop play next play all
2023 solutions
Henrik Juel: Surely, there are 2023 solutions
But how do you compute it? (2023-01-08)
Moldenhauer: Computerprüfung: C+ Jacobi v0.7.6 beta1 Lösungen: 2023 sind bestätigt!
Wie kommt man auf sowas? Interessiert auch mich. (2023-01-09)
A.Buchanan: White & Black play are almost independent. Because Black's first move is e5, wK route is determined. It's nearly C(10,3), but wRd3 would block e2-e4, so subtract one solution to make 120-1 = 119 = 7x17. Black's play is nearly as simple: C(9,2) fails due to collision on f8 3 times, and due to collision on f6 1 time, so 21-3-1 = 17. Note the final move is checkmate, a signature flourish that Noam likes to apply (2023-01-09)
comment
Keywords: Path enumeration (year), Non-Unique Proof Game, Capture-free
Genre: Retro, Mathematics
Computer test: C+ Jacobi v0.7.6 beta1 Lösungen: 2023 sind bestätigt!
FEN: r3kn1r/pppbnppp/1q1p1b2/3Kp3/2B1P2P/4R3/PPPPNPP1/RNBQ4
Input: A.Buchanan, 2023-01-08
Last update: A.Buchanan, 2024-01-02 more...
53 - P1407176
Andrew Buchanan
Retros mailing list 01/01/2023
P1407176
(16+0)
ser-PG in 19
How many solutions?
1. a4 2. Ta3 3. d4 4. h4 5. Thh3 6. Thf3 7. Tf6 8. f4 9. f5 10. Lf4 11. e3 12. Lc4 13. Ld5 14. c4 15. Db3 16. Db6 17. b4 18. Tb3 19. b5 for example
play all play one stop play next play all
2023 solutions
Joost de Heer: See Problemas april 2023 for a detailed explanation on how to calculate the number of solutions. (2023-04-04)
A.Buchanan: Hi Joost thanks for the comment. This problem basically is about "triangle + triangle = square", but the article uses a different mechanism (Elastic Belt) to reach the same number (2023-04-05)
comment
Keywords: Path enumeration (year), Seriesmover, Non-Unique Proof Game
Genre: Retro, Mathematics
FEN: 8/8/1Q3R2/1P1B1P2/P1PP1B1P/1R2P3/6P1/1N2K1N1
Input: A.Buchanan, 2023-01-08
Last update: A.Buchanan, 2023-08-27 more...
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The problems of this query have been registered by the following contributors:

Gerd Wilts (38)
Henri Nouguier (7)
Mario Richter (1)
A.Buchanan (4)
James Malcom (3)