Chess Problem Database Server

61 problem(s) found in 2959 milliseconds (displaying 61 problem(s)). [COMMENTDATE>=20220810 AND G='Retro' AND NOT A='Juel, Henrik' AND K='Ceriani-Frolkin-Thema'] [download as LaTeX]

1 - P0000411
Andrey Frolkin
4429 Die Schwalbe 82 08/1983
2. Lob

(9+13) cooked
BP in 40,0

1. d4 e5 2. d5 f5 3. d6 Le7 4. dxe7 d5 5. e4 d4 6. Dg4 fxg4 7. c4 d3 8. c5 Dd6 9. b4 Kd7 10. cxd6 c5 11. b5 c4 12. b6 Sc6 13. e8=T d2+ 14. Ke2 c3 15. Kd3 d1=L 16. Sd2 Sd4 17. Tf8 Kc6 18. Tf4 exf4 19. e5 h5 20. e6 Lb3 21. e7 Lf7 22. bxa7 b5 23. e8=T b4 24. Te6 b3 25. Th6 gxh6 26. d7 b2 27. d8=T Lce6 28. Td5 Te8 29. Kc4 b1=L 30. a8=T Lh7 31. Ta3 c2 32. Tg3 Se7 33. a4 Thf8 34. a5 Sg6 35. a6 Sh8 36. a7 fxg3 37. a8=T gxh2 38. T8a3 Lhg8 39. Th3 gxh3 40. Se4 Lxd5+
play all

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...

2 - P0001121
Michel Caillaud
4298v Die Schwalbe 80 04/1983
2. ehrende Erwähnung

(12+14) C+
BP in 30,5

1. a4 c6 2. a5 Dc7 3. a6 De5 4. axb7 a5 5. b4 a4 6. b5 Ta5 7. b6 Sa6 8. b8=D a3 9. Dd6 a2 10. De6 dxe6 11. b7 Kd7 12. b8=T Kd6 13. Tb3 Kd5 14. Tf3 Ke4 15. Tf5 exf5 16. Sa3 Le6 17. Sb5 Lc4 18. La3 e6 19. Tc1 a1=S 20. d4 Sb3 21. d5 Sd2 22. d6 Sxf1 23. d7 Sg3 24. hxg3 Lb4+ 25. Kf1 Se7 26. Th6 Tb8 27. d8=L Sc8 28. Lh4 g5 29. g4 gxh4 30. g5 Le1 31. f3+
play all

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Keywords: Ceriani-Frolkin Theme (DTsL), Unique Proof Game, Allumwandlung, Promotion
Genre: Retro
Computer test: Moldenhauer: Computerprüfung: C+ Stelvio 1.11 63 Sekunden. Keine Lösung: BP 29.5, BP 30.0.
FEN: 1rn5/5p1p/n1p1p2R/rN2qpP1/2b1k2p/B4P2/2P1P1P1/2RQbKN1
Reprints: 12 Shortest Proof Games 11/1991
(A) Quartz 26 10-12/2004
Input: Gerd Wilts, 1995-06-03
Last update: A.Buchanan, 2023-04-15 more...

3 - P0001550
Michel Caillaud
421 Europe Echecs 295 07/1983
A. Hazebrouck gewidmet
1. Preis

(13+12) C+
BP in 35.5

1. h4 c5 2. h5 c4 3. Th4 c3 4. Tc4 b5 5. g4 b4 6. Lg2 b3 7. Lc6 bxa2 8. b4 a5 9. b5 a4 10. b6 a3 11. La4 Sc6 12. b7 d5 13. b8=D d4 14. Dd6 d3 15. Dg6 dxc2 16. d3 fxg6 17. Ld2 c1=L 18. Db3 c2 19. La5 Lh6 20. Sd2 c1=L 21. Sf1 Lcg5 22. f4 Kf7 23. 0-0-0 a1=L 24. fxg5 a2 25. gxh6 Kf6 26. Sh2 Kg5 27. Tf1 Lf6 28. Tff4 a1=L 29. Kb1 Lae5 30. d4 Lb7 31. dxe5 Dd2 32. exf6 Te8 33. f7 Sf6 34. Dd3 Sd7 35. Ld1 Sdb8 36. Sgf3+
play all

5 Frolkin-Ceriani-Umwandlungen: 4 schwarze Läufer und 1 weiße Dame! Eine der bahnbrechenden frühen KBPs.

Silvio Baier: Der wesentliche thematische Inhalt ist bereits nach 31,5 Zügen erreicht. Bis dahin ist es C+ (Euclide 0.98). (2010-08-04)
James Malcom: Is this fully C+ then? (2021-01-27)
Henrik Juel: No, only the first 31.5 moves are tested OK (2021-01-27)
James Malcom: No Henrik, as in is the entire problem testable. (2021-01-27)
Henrik Juel: I guess that testing the entire problem would take an unreasonably long time (2021-04-06)
A.Buchanan: It might be possible these days: the motivation for stopping at 31.5 is that the promotion theme had been demonstrated by then. But there’s still e.g. bSb8 as random impostor (2021-04-07)
Moldenhauer: Computerprüfung: C+ Stelvio 1.11 50:24:34 Stunden.(hh:mm:ss)
Keine Lösung: BP 34.5, BP 35.0. (2023-05-08)
Henrik Juel: Thanks for your patience, Moldenhauer; more than two days... (2023-05-08)
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Keywords: Ceriani-Frolkin Theme (llllD), Unique Proof Game, Castling, Promotion (llllD), Impostor (s)
Genre: Retro
Computer test: Computerprüfung: C+ Stelvio 1.11 50:24:34 Stunden.(hh:mm:ss) Keine Lösung: BP 34.5, BP 35.0.
FEN: 1n2rb1r/1b2pPpp/2n3pP/B5kP/2R2RP1/3Q1N2/3qP2N/1K1B4
Reprints: 25 Shortest Proof Games 11/1991
(1) diagrammes 103 10-12/1992
(A) Quartz 22 10-12/2002
(8-a) Die Schwalbe 250A 08/2011
Input: Gerd Wilts, 1995-06-03
Last update: James Malcom, 2021-04-07 more...

4 - P0001569
Andrey Frolkin
439v Europe Echecs 310 10/1984
Lob

(12+14) cooked
BP in 27,0

1. f4 h5 2. f5 h4 3. f6 h3 4. fxe7 f5 5. d4 Kf7 6. e8=T Kg6 7. Te6+ Kh5 8. Ta6 bxa6 9. Dd2 Lb7 10. e4 Lc6 11. e5 La4 12. e6 Sc6 13. e7 Db8 14. e8=T Db3 15. Te5 Te8 16. d5 Te6 17. dxe6 Lb4 18. Ta5 Lc3 19. Lb5 f4 20. e7 f3 21. e8=T f2+ 22. Ke2 f1=S 23. Tb8 Sxh2 24. Tb6 cxb6 25. Sf3 bxa5 26. Se5 Sf3 27. Sg4 Sfd4+
play all

Cook: 1. f4 h5 2. f5 h4 3. f6 h3 4. fxe7 f5 5. e4 Kf7 6. e8=T f4 7. Te6 f3 8. Ta6 bxa6 9. e5 Kg6 10. e6 Lb7 11. e7 Lc6 12. e8=T La4 13. Te5 Sc6 14. Ta5 Db8 15. d4 Db3 16. Lb5 f2 17. Ke2 f1=S 18. Sf3 Te8 19. Se5 Kh5 20. d5 Te6 21. dxe6 Sxh2 22. e7 Sf3 23. e8=T Lb4 24. Tb8 Lc3 25. Tb6 cxb6 26. Sg4 bxa5 27. Dd2 Sd4

more ...
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Keywords: Ceriani-Frolkin Theme (TTT), Unique Proof Game, Non-standard material, Promotion (s)
Genre: Retro
Computer test: Computerprüfung: Cooked Stelvio 1.11 1 Sekunde. Keine Lösung: BP 26.0, BP 26.5.
FEN: 6nr/p2p2p1/p1n5/pB5k/b2n2N1/1qb4p/PPPQK1P1/RNB4R
Reprints: 21 Shortest Proof Games 11/1991
Input: Gerd Wilts, 1995-06-03
Last update: A.Buchanan, 2023-05-08 more...

5 - P0001577
Michel Caillaud
447 Europe Echecs 316 04/1985
2. Preis

(14+11) C+
BP in 26,5

1. f4 h5 2. f5 h4 3. f6 h3 4. fxe7 hxg2 5. h4 g5 6. h5 g4 7. Th4 g3 8. Sh3 g1=L 9. Lg2 Le3 10. Lc6 g2 11. dxe3 g1=T+ 12. Kf2 Tg3 13. e4 Tb3 14. axb3 f5 15. Ta6 f4 16. La4 f3 17. Kg3 f2 18. Th6 f1=D 19. Dd6 Df7 20. Lf4 Dc4 21. bxc4 a5 22. Lb3 a4 23. Da6 a3 24. Ld6 a2 25. Sf4 axb1=S 26. La2 Sc3 27. bxc3
play all

Erstdarstellung einer Frolkin-Ceriani-Allumwandlung in einer eindeutigen KBP.

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Keywords: Allumwandlung, Ceriani-Frolkin Theme (dtls), Unique Proof Game, Homebase (S)
Genre: Retro
Computer test: Euclide 0.93 Ergänzung Stelvio 1.2. Keine Lösung BP 25.5, BP 26.0.
FEN: rnbqkbnr/1pppP3/Q2B3R/7P/2P1PN1R/2P3K1/B1P1P3/8
Reprints: 13 Shortest Proof Games 11/1991
(19) diagrammes 15 07-09/1994
Thema Danicum 106 2002
(B) Quartz 26 10-12/2004
Input: Gerd Wilts, 1995-06-03
Last update: A.Buchanan, 2023-05-21 more...

6 - P0001580
Dmitri W. Pronkin
450 Europe Echecs 319/320 07-08/1985

(12+11) cooked
BP in 31,5

1. b4 h5 2. Lb2 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. Sd2 f1=L 19. Tb1 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. Tf1 cxb5 30. Tf2 Sc6 31. Sf1 dxc4+ 32. Ld5+
play all

Cook: 1. b4 e5 2. Lb2 e4 3. Dc1 e3 4. Kd1 exf2 5. g4 Ld6 6. g5 Lxh2 7. g6 Kf8 8. gxf7 g5 9. Lg2 f1=L 10. e4 Lb5 11. Se2 Lg1 12. Th4 h5 13. e5 Kg7 14. c4 Th6 15. cxb5 Ta6 16. Tc4 Lc5 17. d4 h4 18. e6 h3 19. e7 h2 20. e8=D d5 21. bxa6 Se7 22. Db5 c6 23. Sd2 cxb5 24. Sf1 h1=D 25. f8=T Dh6 26. Tf2 Db6 27. Df4 Lf5 28. Tb1 Kg8 29. dxc5 Sc8 30. cxb6 Sc6 31. Sc1 dxc4+ 32. Ld5+

Paulo Roque: obs: Cook: 26...D6b6 (2008-12-24)
paul: See P0001634 as correction. (2010-09-25)
Moldenhauer: Computerprüfung: Cooked Stelvio 1.6 in 31:54:04 Stunden. (hh:mm:ss).
1 Lösung mit 20 cooks. (2024-01-07)
comment

Keywords: Ceriani-Frolkin Theme (lllLL), Unique Proof Game, Promotion (lllLL)
Genre: Retro
FEN: r1nq2k1/pp6/PPn5/1p1B1bp1/1Pp2Q2/8/PB3R2/1RNK1N2
Reprints: 26 Shortest Proof Games 11/1991
Input: Gerd Wilts, 1995-06-03
Last update: A.Buchanan, 2021-04-06 more...

7 - P0001600
Pascal Wassong
470 Europe Echecs 334 10/1986

(13+14) cooked
BP in 20,0

1. b4 c5 2. b5 Sc6 3. bxc6 b5 4. c7 La6 5. c8=L d6 6. Lf5 Tc8 7. d4 Tc6 8. d5 Db8 9. dxc6 e6 10. c7 Le7 11. c8=S Ld8 12. Se7 Lb6 13. Sg6 hxg6 14. h4 Ke7 15. h5 Kf6 16. h6 Se7 17. h7 Te8 18. h8=T gxf5 19. Th4 Sg6 20. Te4 fxe4
play all

Cook: 1. b4 c5 2. b5 Sc6 3. bxc6 b5 4. d4 La6 5. d5 Tc8 6. d6 Tc7 7. dxc7 Db8 8. c8=L d6 9. Lf5 e6 10. h4 Ke7 11. h5 Kf6 12. c7 Le7 13. c8=S Ld8 14. Se7 Lb6 15. Sg6 Se7 16. h6 hxg6 17. h7 Te8 18. h8=T gxf5 19. Th4 Sg6 20. Te4 fxe4

Henrik Juel: Dual: ... 4.d4 La6 5.d5 Tc8 6.d6 Tc7 7.dxc7 Db8 8.c8L d6 9.Lf5 ... (2004-02-12)
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Keywords: Ceriani-Frolkin Theme (TLS), Unique Proof Game, Homebase (W), Promotion
Genre: Retro
Computer test: Ergänzung Stelvio 1.2. Keine Lösung BP 19.0, BP 19.5.
FEN: 1q2r3/p4pp1/bb1ppkn1/1pp5/4p3/8/P1P1PPP1/RNBQKBNR
Input: Gerd Wilts, 1995-06-03
Last update: A.Buchanan, 2023-05-21 more...

8 - 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 ...
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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...

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

(13+14) cooked
KBP?

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

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

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

10 - P0001657
Philippe Leroy
526 Europe Echecs 376 04/1990

(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

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)
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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...

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

(14+10)
BP in 29,5

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

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

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

12 - 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...

13 - P0002582
Alexander Kislyak
5604 feenschach 92 09-10/1989

(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

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...

14 - P0005084
Luigi Ceriani
Sahovski vjesnik 07/1948
Ing. Petrovic gewidmet
1. ehrende Erwähnung

(12+8)
Welches waren die 12 Schlagfälle?

R: 1. ... Tc1xSd1 2. Sc3-d1 Tc2xLc1 3.
play all

Henrik Juel: -1... Tc1xSd1 -2.Sc3 Tc2xLc1 etc.
The other black captures were f7xLg6 and g7xSh6.
White captured c2xPb3xPa4, g2xLf3, and h2xSg3xSf4xPe5xPd6xPc7.
Unusually easy for a Ceriani retro.
The record in this genre may be P1000077 ; does anyone know of a retro with less than 19 men in the diagram position and the stipulation 'What were the captures?' ? (2012-07-13)
James Malcom: What is the full solution? (2023-05-30)
Henrik Juel: The 12 captures are given in the first three lines of my 2012 comment
The further retroplay is easy and of little interest, I believe
James, you might want to change the initial retroplay to
R: 1. ... Tc1xSd1+ 2. Sc3-d1 Tc2xLc1+ etc.
(with uncheck plusses added) (2023-05-30)
comment

Keywords: Uncapture of pieces by pieces, Ceriani-Frolkin Theme
Genre: Retro
FEN: 8/2P4p/3r3p/6p1/P1k5/P4P2/RP1PPP2/Qq1rKRb1
Reprints: 78 32 personaggi e 1 autore 1955
Input: Gerd Wilts, 1995-06-03
Last update: James Malcom, 2023-05-30 more...

15 - P0006477
Thierry Le Gleuher
3350 diagrammes 114 07-09/1995

(11+16) C+
BP in 26,0

1. Sf3 a5 2. Sd4 a4 3. Sb3 axb3 4. a4 Ta6 5. a5 Td6 6. a6 Txd2 7. a7 d5 8. a8=S Ld7 9. Sb6 cxb6 10. c4 b5 11. c5 Db6 12. c6 Dd4 13. c7 Lc6 14. c8=S Sd7 15. Sd6 exd6 16. e4 Se7 17. e5 Sc8 18. e6 Se5 19. e7 Kd7 20. e8=S Ke6 21. Sf6 gxf6 22. g4 Lg7 23. g5 Te8 24. g6 Lh8 25. g7 Te7 26. g8=S Sf3+
play all

Brilliant cavalcade in a very clear construction.

Moldenhauer: Ergänzung: C+ Stelvio 8 Sekunden.
Keine Lösung: BP 25.5. (2023-06-24)
comment

Keywords: Ceriani-Frolkin Theme (SSS), Unique Proof Game, Promotion
Genre: Retro
Computer test: Resolution time : 18 mn 14.45 s., Natch 2.3 Copyright (C) 1997,98,99,2001,2002,2003,2004 Pascal Wassong
FEN: 2n3Nb/1p2rp1p/2bpkp2/1p1p4/3q4/1p3n2/1P1r1P1P/RNBQKB1R
Input: Gerd Wilts, 1996-06-16
Last update: James Malcom, 2023-06-24 more...

16 - P0008641
Alexandr I. Zolotarev
9576 Die Schwalbe 164 04/1997

(9+13)
Welches war die minimale Zahl aller Damenzüge?

Die unglaublich harte Bedingung (minimale Anzahl Damenzüge) bewirkt, dass die wDd1 nicht gezogen hat und die sDh4 eine UWF ist. Um die Stellung aufzulösen, müssen 2 weiße UW auf g8 zurückgenommen werden. Da dort nur Türme entwandelt werden können (Damen scheiden wegen der Bedingung aus!) darf die sDd7 zunächst nicht nach d8 zurückziehen.
R: 1. Te1-f1 d5xTe4 2. Tb4-e4 a6-a5 3. Tb8-b4 g3xSh2+ 4. Sf1-h2+ f4xSg3 5. b7-b8=T a7-a6 6. b6-b7 e5xSf4 7. a5xLb6
Zwei Damenzüge: Dd8-d7, Dh1-h4
play all

Cook: Beispuielauflösung mrimit 3 D-Zügen:
R: 1. Te1-f1 g3xSh2 2. Sf1-h2 d5xTe4 3. Tb4-e4 f4xBg3 4. Tb8-b4 a6-a5 5. b7-b8=T e5xSf4 6. b6-b7 d6xTe5 7. a5xLb6 Lc5-b6 8. Sd3-f4 Ld4-c5 9. Te4-e5 Le5-d4 10. Tc4-e4 Lf4-e5 11. Tc8-c4 Lh6-f4 12. Tg8-c8 Lg7-h6 13. Sb4-d3 Lh6-g7 14. Sc6-b4 Lg7-h6 15. Sa7-c6 Lh6-g7 16. Sc8-a7 Lg7-h6 17. c7-c8=S Lf8-g7 18. c6-c7 Lg7-f8 19. c5-c6 Dc7-d7 20. c4-c5 Lf8-g7 21. g7-g8=T c6xBd5 22. g6-g7 g7xSf6 23. Sd7-f6 Te4-e6 24. Sb6-d7 Te6-e4 25. Sa8-b6 d7-d6 26. a7-a8=S Td6-e6 27. Ke5-f5 Td4-g4 28. g5-g6 Kg4-f3 29. Sd2-f1 Lg6-h5 30. Sf3-d2 Lb1-g6 31. Sc3-e2 b2-b1=L 32. Sb1-c3 b3-b2 33. c2-c4 Tb4-d4 34. Te2-e1 Tb8-b4 35. Td2-e2 b4-b3 36. Td3-d2 b5-b4 37. Ta3-d3 Ta8-b8 38. Kd4-e5 Th6-d6 39. Kd3-d4 Kf5-g4 40. Ke2-d3 Ke6-f5 41. d4-d5 Kd5-e6 42. Lh2-g1 Kc5-d5 43. d3-d4 Kb6-c5 44. a4-a5 Kb7-b6 45. Tg1-g2 Kc8-b7 46. Lg2-h1 Kd8-c8 47. Lf1-g2 Ke8-d8 48. Ta1-a3 Dd8-c7 49. Se1-f3 Lg2-h3 50. a2-a4 c7-c6 51. g4-g5 Lb7-g2 52. g2-g3 Lc8-b7 53. Sf3-e1 b7-b5 54. b6xSa7 Sc6-a7 55. Ke1-e2 Sb8-c6 56. Lf4-h2 Dh1-h4 57. e2-e3 h2-h1=D 58. Th1-g1 Th8-h6 59. Lc1-f4 h3-h2 60. Sg1-f3 h4-h3 61. h3xSg4 Sf6-g4 62. h2-h3 Sg8-f6 63. d2-d3 a7-a6 64. b5-b6 h5-h4 65. b4-b5 h7-h5 66. b2-b4

(2 sD)
Hans-Jürgen Manthey: Es sind 3 Damenzüge ! Ein Läufer kommt von b1, darum kann Bb2-b4-b5-b6-b7-b8 nicht geschehen sein. Es gibt die Schlagfälle bxsSc, hxsSg und axsL bei 13 Steinen. Darum verlässt die sD die D-spalte, damit der dBauer zum wS wird, der sich dann auf f6 opfert !
Vorwärts, damit Kurznotation besser lesbar:
1. g3 h5 2. b3 h4 3. b4 Sf6 4. a3 Sg4 5. a4 Sa6 6. a5 Sc5 7. bxSc5 b5 8. h3 c6 9. hxSg4 b4 10. g5 b3 11. g6 La6 12. g4 Lc4 13. g5 Le6 14. Sh3 Dc7(1.) 15. Lb2 Kd8 16. Le5 Kc8 17. Lh2 Kb7 18. Lg1 Ka6 19. Th2 Kb5 20. Tg2 Kc4 21. Sc3 b2 22. Sb5 b1=L 23. Sd4 Kd5 24. d3 La2 25. e3 Ke5 26. Sf4 L2d5 27. c4 h3 28. Ta2 h2 29. Te2 Th3 30. Sh5 Tf3 31. Kd2 h1=D 32. Te1 Dh4(2.) 33. Th2 Tf4 34. Lg2 Lf3 35. Se2 Kf5 36. Lh1 Kg4 37. Sg3 Le4 38. Tg2 Kf3 39. Sf5 L4d5 40. Kc3 Le4 41. Sd6 Lg4 42. Kd4 Lh5 43. Ke5 Lf5 44. d4 Lh3 45. d5 Tg4 46. Kf5 Tb8 47. Se4 Ta8 48. Sf6 gxSf6 49. g7 d6 50. g8=T Lg7 51. g6 Lh6 52. Tb8 Lf8 53. Tb2 Lh6 54. Td2 Lf4 55. Td4 Le5 56. Te4 La1 57. Te5 dxe5 58. d6 Ld4 59. d7 La1 60. d8=S Ld4 61. Se6 Td8 62. g7 Td6 63. Sf4 Te6 64. g8=T La1 65. Td8 Ld4 66. Td5 cxTd5 67. c6 Dd7(3.) 68. c7 La1 69. c8=S Ld4 70. Sd6 La1 71. Se4 Ld4 72. S4g3 La1 73. Sf1 Ld4 74. c5 La1 75. c6 Ld4 76. c7 La1 77. c8=S Ld4 78. Sd6 La1 79. Se4 Ld4 80. S4g3 Lb6 81. axLb6 exSf4 82. b7 a6 83. b8=T fxSg3 84. Sh2+ gxSh2 85. Tb4 a5 86. Te4 dxTe4 87. Tf1 (2021-08-02)
A.Buchanan: Two queen moves is enough, as the animation shows. I agree white captures are hxg,axb,bxa/c. bBh promoted on h1, then moved to h4. bBh2 captured in from the left. Black pawn captures something like cxBdxexfxgxh,gxf,dxe. White abcB all promoted and at least one wB on g8. No need for a third D move as far as I can see. (2021-08-03)
Mario Richter: Hi Andrew - the main question is: How do you get the black king home?
In the solution given, after R: 7. a5xLb6 there is a black pawn on e5.
The position can only be unlocked by retracting wKe5-f5. Where exactly is the mentioned black pawn e5 at the moment wKe5-f5 is retracted? (2021-08-03)
A.Buchanan: Hi Mario, I was just responding to H-J's text assertion that 3 D moves are needed. A PG with 3 D moves could not prove that 2 are insufficient, and I find long unanimated PGs too tedious to read through sorry. I now think that the animation must be wrong, but I haven't convinced myself that no solution exists. I must work, but will have a go later. (2021-08-03)
A.Buchanan: OK - we can make sL on queenside and shift to kingside, and I can see that knights (or bishops) can't reach g8 to retract there, so it must be rooks along the 8th rank. So we can't retract the sDd7, and can't shift sTe6. But few Black tempi then. But this is not my kind of retro, and I will give up here. What's the answer: 2 or 3? (2021-08-03)
Mario Richter: My guess is, that the intended solution was 2 Queen moves, but that it it is impossible to get the black king home: R: sLf8, g7xf6 locks e8 from the right side, R: sDd8-d7, sBd7-d6 locks e8 from the left side (2021-08-03)
A.Buchanan: WinChloe has two earlier versions, and the composer was very experienced (200+ retros just in PDB) but I have now looked enough to think this is cooked. Even if we shift sBa forward 2 squares to give us a couple more moves, then all goes well shifting sL & wT to kingside, but we reach a point where sBc7xwBd6, with still sBd5, so the two pawns are the wrong side of one another. What does Rawbats think? (2021-08-04)
Mario Richter: Perhaps it suffices to say what I think?!
With bPa2 instead of a5 it is easy to reach the position with 2 queen moves only:
1. retract R: 1. Te1-f1 g3xSh2 2. Sf1-h2+
2. retract d6xSe5(or d6xTe5)xSf4xBauer_g3 while W makes tempo moves e.g. with wLg1
3. unpromote the S or Te5 on b8 and retract the wPawn to b6, while bPawn a2 retracts to a6
4. uncapture a5xLb6 - now there is no time pressure
5. unpromote wS on c8 and retract the wPawn to c6
6. retract c7xBauer_d6(!)
[this idea was inspired by the question, how the situation mentioned in your comment "we reach a point where sBc7xwBd6, with still sBd5", can be avoided]
7. retract wPawn_d6 to e.g. d3 (but not d2)
8. retract d5xTe4
9. bring wT to g8, sL to f8
10. retract g7-g8=T Dd8-d7 g6-g7 g7xSf6 (or Tf6)
11. unpromote wS or wT on a8
12. the rest is easy to see

Since the author wanted to show a certain combination of C-F-pieces, the above mentioned choices in the uncapture of white pieces still make the modified version of the problem cooked, even if with bPa2 2 Queen-moves suffice.

Zolotarev used the matrix of this problem a lot, search the PDB with
A='Zolotarev' AND G='Retro' AND POSITION='wKf5 sKf3'

And yes, the Composer may be "very experienced" as you put it, but he was also very productive regarding cooks, check e.g. https://www.dieschwalbe.de/ergaenzungena2.htm ...

And one more mysterium: the Retro Corner gives 3 Queen-moves as the solution, s. https://www.janko.at/Retros/Schwalbe/Solutions.htm#9576 (2021-08-05)
Hans-Jürgen Manthey: Es sind 3 DAME-züge nötig !! (und nicht 2 wie A.Buchanan behauptet !)
Zuerst den wK nach f5 dann bK f3 nur möglich wenn der wK kurz auf g5 parkt. jedoch Dh4, Lh3, Tg4 verhindern diesen Plan. Es muß also zuerst bKf3 geschehen. Damit der wK nun nach f5 gelangen kann, darf e5 weder gedeckt (d6) noch besetzt sein (e5). Dank den Hinterstellungen Lh1-Tg2 & Lh3-Tg4 ist nach bxSf6 kein K-Zug mehr möglich ! Da ein g-Springer nicht die Ecke verlassen kann, muß es ein T sein. Auf c(oder a & c) entstandene T (oder S) können auf e5, f4 zwar geschlagen werden, aber es ist keine figur übrig um sich auf f6 zu opfern ! der bK muß aber über d7 oder d8 sein gefängnis verlassen, darum benötigt die ursprungsD 2 Züge(Dc7 oder Dc8 sowie Dd7) + 1 Zug die UmwandlunsDame(Dh4) = 3 Züge !!
Beispiel:
R.: 1. ... Te1-f1 2. d5xTe4 Tb4-e4 2. g3xSh2 Sf1-h2+ 3. f4xg3 Tb8-b4 4. a6-a5 b7-b8T 5. a7-a6 b6-b7 6. e5xTf4 Tb4-f4+ 7. d6xTe5 a5xLb6 8. Lc7-b6 Te5-e4 9. Ld8-c7 Tc4-e4 10. Lb6-d8 Tc8-c4 11. Ld4-b6 c7-c8T 12. Le5-d4 Tb8-b4 13. Lf4-e5 Tg8-b8 14. Dc8-d7 (1.) g7-g8T 15. Lh6-f4 g6-g7 16. Lf8-h6 g5-g6 17. g7xSf6 Se8-f6 18. d7-d6 c6-c7 19. Te4-e6 Ke5-f5 20. Tb4-e4+ c5-c6 21. Td4-g4 Sd6-e8 22. Kg4-f3 Th2-g2 23. Tf4-d4 Sd2-f1 24. c6xd5 d4-d5 25. Tf6-f4 Lg2-h1 26. Th6-f6 Lf1-g2 27. Lg2-h3 Sc4-d6 28. Ld5-g2 Sf3-d2 29. Kh3-g4 Tg2-h2+ 30. Kg4-h3 Sc3-e2 31. Lg6-h5 Te2-e1 32. Tb8-b4 Sb6-c4 33. Ta8-b8 Ta2-e2 34. Dh1-h4 (2.) Ta1-a2 35. h2-h1D e2-e3 36. h3-h2 Lh2-g1 37. Th8-h6 Tg1-g2 38. Lc4-d5 Th1-g1 39. h4-h3 g2-g3 40. La6-c4 Sg1-f3 41. h5-h4 Lf4-h2 42. Lb1-g6 Ke4-e5 43. b2-b1L+ Sb1-c3 44. b3-b2 Ke3-e4 45. Kf5-g4 Kd2-e3 46. b4-b3 Ke1-d2 47. b5-b4 Lc1-f4 48. Ke6-f5 g4-g5 49. Kd6-e6 c4-c5+ 50. Kc7-d6 d2-d4 51. Kd8-c7 c2-c4 52. Ke8-d8 a4-a5 53. Dd8-c8 (3.) a2-a4 54. h7-h5 h3xSg4 55. Sf6-g4 Sc8-b6 56. Sg8-f6 c7-c8S 57. Lc8-a6 h2-h3 58. b7-b5 b6xSc7 59. Sa6-c7 b5-b6 60. Sb8-a6 b4-b5 61. c7-c6 b2-b4 (2023-03-09)
comment

Keywords: Ceriani-Frolkin Theme
Genre: Retro
FEN: 8/3qpp2/4rp2/p4K1b/4p1rq/4Pk1b/4NPRp/3Q1RBB
Input: Gerd Wilts, 1997-05-11
Last update: Mario Richter, 2021-08-03 more...

17 - P1000246
Andrej N. Kornilow
Alexander Kislyak
10666 Die Schwalbe 181 02/2000

(15+15) C+
BP in 30,5

1. h4 a5 2. h5 a4 3. h6 a3 4. hxg7 axb2 5. Th6 Ta3 6. Tc6 Tf3 7. a4 h5 8. a5 h4 9. a6 h3 10. a7 h2 11. a8=D h1=D 12. Da5 Dh4 13. De5 Dd4 14. Ta5 Th4 15. Sa3 Sh6 16. g8=D b1=D 17. Dgg3 Dbb6 18. Dh2 Da7 19. g4 b5 20. g5 b4 21. g6 b3 22. g7 b2 23. g8=D b1=D 24. Dgg2 Dbb7 25. Lb2 Lg7 26. Da1 Kf8 27. Kd1 Kg8 28. Kc1 Kh7 29. Kb1 Dh8 30. Ka2 Lf8 31. Lc1
play all

Reto: This is a case where strategy analysis in Stelvio is in a certain sense optimal: Only 1 strategy remains after analysis, namely the one that belongs to the solution. (2023-04-25)
more ...
comment

Keywords: Unique Proof Game, Symmetrical position, Non-standard material (DDdd), Phoenix, Prenix, Ceriani-Frolkin Theme, Asymmetrical solution, Promotion (DDDddd)
Genre: Retro
Computer test: Computerprüfung: C+ Stelvio 1.11 1 Sekunde. Keine Lösung: BP 29.5, BP 30.0.
FEN: 1nb2b1q/qqpppp1k/2R4n/R3Q3/3q3r/N4r2/K1PPPPQQ/Q1B2BN1
Input: Gerd Wilts, 2000-08-01
Last update: A.Buchanan, 2023-04-26 more...

18 - P1000659
Michel Caillaud
R071 Probleemblad 11/1999

(11+15)
KBP 27,5

1. e4 h5 2. Dg4 hxg4 3. Sf3 gxf3 4. Le2 fxe2 5. Tf1 exf1=L 6. b4 La6 7. b5 Th3 8. bxa6 b5 9. La3 Lb7 10. Ld6 exd6 11. Sc3 Le7 12. Se2 Lf6 13. Sg1 Lc3 14. e5 La5 15. e6 Tc3 16. h4 Le4 17. h5 Sc6 18. h6 Tb8 19. h7 Tb7 20. h8=D Db8 21. Dh5 Sd8 22. Dd1 f6 23. e7 Kf7 24. e8=S c6 25. Sc7 b4 26. Sb5 b3 27. Sa3 b2 28. Sb1
play all

sBh7 schlägt DSLT. wDd1 und wSb1 sind Phönixfiguren, wSg1 ist wSb1.

Moldenhauer: Computerprüfung: C+ Stelvio 1.5 in 147:43:15 Stunden.(hhh:mm:ss)
Keine Lösung: BP 27.0 in 49:30:01 Stunden. (2023-08-17)
comment

Keywords: Ceriani-Frolkin Theme (l), Unique Proof Game, Pronkin Theme (DS), Impostor (S)
Genre: Retro
FEN: 1q1n2n1/pr1p1kp1/P1pp1p2/b7/4b3/2r5/PpPP1PP1/RN1QK1N1
Reprints: H35 FIDE Album Annexe 1998-2000 2009
Input: Gerd Wilts, 2000-08-01
Last update: Gerd Wilts, 2009-07-25 more...

19 - P1001055
Satoshi Hashimoto
11046 Die Schwalbe 187 02/2001

(14+15) C+
BP in 17,5

1. Sc3 b5 2. Sa4 b4 3. c3 b3 4. Dc2 bxc2 5. Tb1 cxb1=D 6. Sf3 De4 7. d3 e6 8. Le3 Df6 9. Sd2 Dff3 10. exf3 Lc5 11. Le2 d6 12. 0-0 Kd7 13. Ta1 Kc6 14. Sb1 Kb5 15. Lc1 Le3 16. Kf1 c5 17. Ke1 Sc6 18. Lf1
play all

Henrik Juel: Natch 3.3 just needed less than a second to test this proof game (2023-06-12)
comment

Keywords: Unique Proof Game, Ceriani-Frolkin Theme (d), Interchange (T), Castling, Switchback (LL)
Genre: Retro
Computer test: Resolution time : 58.79 s., Natch 2.3 Copyright (C) 1997,98,99,2001,2002,2003,2004 Pascal Wassong
FEN: r1b3nr/p4ppp/2npp3/1kp5/N3q3/2PPbP2/PP3PPP/RNB1KB2
Input: Gerd Wilts, 2001-02-11
Last update: Gerd Wilts, 2005-12-30 more...

20 - P1004179
Arpad Molnar
R275 The Problemist 05/1998
4. ehrende Erwähnung

(11+10) cooked
Letzte 12 Einzelzüge?

R: 1. a4xSb3+ Dd8-b6 2. b6xSa5 Tc8-c6 3. c7xSb6 Lc6-b5 4. b5xSa4 Sa8-b6 5. b6-b5 Lb7-c6 6. Kb5-b4 c3-c4+
play all

Gerald Ettl: Wie lautet der Cook? (2023-09-28)
comment

Keywords: Ceriani-Frolkin Theme (SSSS), Last Moves? (12)
Genre: Retro
FEN: 1N6/p2p1ppp/RQRp4/pBNP4/1kP5/bp6/PPK5/8
Reprints: (1) Quartz 18 10-12/2001
Input: Gerd Wilts, 2002-09-05
Last update: Gerd Wilts, 2004-08-28 more...

21 - P1004461
Ivan Denkovski
Gligor Denkovski
972 Orbit 17 01/2003
1. Lob

(12+12)
BP in 16,5

1. e3 a5 2. Ld3 Sa6 3. Lg6 hxg6 4. h4 Th5 5. Sh3 Tb5 6. h5 Txb2 7. h6 Txa2 8. hxg7 Ta4 9. La3 Th4 10. Lxe7 Th8 11. Lg5 Df6 12. gxf8=T+ Ke7 13. Txc8 Txc8 14. 0-0 Tf8 15. Kh2 Ke8 16. Kg3 Dd8 17. Sg1
play all

Henrik Juel: Natch 3.1 did little in an hour (2018-12-17)
Moldenhauer: Computerprüfung: C+ Euclide 1.11 5 Std. 32 Min. nur eine Lösung!
Keine Lösung bei BP 15.5 in 21 Min. und BP 16.0 in 45 Min.
Notation OK. (2022-12-21)
more ...
comment

Keywords: Ceriani-Frolkin Theme (T), Unique Proof Game, Pure Round Trip (t), Switchback (dkS)
Genre: Retro
FEN: 3qkrnr/1ppp1p2/n5p1/p5B1/8/4P1K1/2PP1PP1/RN1Q1RN1
Input: Gerd Wilts, 2003-02-01
Last update: Olaf Jenkner, 2016-09-03 more...

22 - 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...

23 - 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...

24 - P1011844
Rustam Ubaidullajew
1188 Orbit 20 10/2003
1. ehrende Erwähnung

(12+15) C+
BP in 21,0

1. c3 h5 2. Da4 Sh6 3. Dc6 bxc6 4. a4 La6 5. Ta3 Lb5 6. Tb3 Lxa4 7. Tb6 axb6 8. f4 Ta5 9. f5 Sa6 10. f6 Tg5 11. fxg7 f5 12. g8=T Kf7 13. Tg7+ Ke6 14. Tg6+ Kd5 15. Tg8 Kc4 16. Sa3+ Kb3 17. c4 Ka2 18. b3 Txg8 19. Lb2 Lg7 20. Lf6 Te8 21. Lh4 La1
play all

Tempoverlustmanöver eines UWT, der anschliessend durch eine Figur geschlagen wird (Ceriani-Frolkin-Thema).

Moldenhauer: Computerprüfung: C+ Stelvio 1.11 02:45:16 Stunden. (hh:mm:ss)
Keine Lösung: BP 20.0, BP 20.5. (2023-03-16)
comment

Keywords: Ceriani-Frolkin Theme (T), Unique Proof Game, Tempo Loss (T3)
Genre: Retro
Computer test: Stelvio 1.11
FEN: 3qr2r/2ppp3/npp4n/5p1p/b1P4B/NP6/k2PP1PP/b3KBNR
Input: Gerd Wilts, 2003-11-15
Last update: Silvio Baier, 2023-03-20 more...

25 - P1013082
Reto Aschwanden
R229 Probleemblad 02/2004
1. Preis

(14+10) C+
BP in 21,5

1. a4 f5 2. Ta3 f4 3. Th3 f3 4. Th4 fxg2 5. Sh3 g1=D 6. f4 Db6 7. Sc3 Dxb2 8. Lxb2 g5 9. Db1 g4 10. Sd1 g3 11. Le5 g2 12. c3 g1=S 13. Dxh7 Sf3+ 14. exf3 Sc6 15. Ld3 Sd4 16. 0-0 Se2+ 17. Kh1 Sg1 18. Txg1 c6 19. Txg8 Db6 20. Lg6+ Kd8 21. d3 Dg1+ 22. Sxg1
play all

Schlag der beiden Anti-Pronkin-Steine Dg1 und Sg1 (auf demselben Feld!)

Reto: Solving in parallel with Stelvio v1.25 at brings this down to 24h (with room for improvement still) (2023-05-28)
comment

Keywords: Anti-Pronkin (ds), Ceriani-Frolkin Theme (ds), Unique Proof Game
Genre: Retro
Computer test: Stelvio 1.2, 101h. This is way too slow...
FEN: r1bk1bRr/pp1pp2Q/2p3B1/4B3/P4P1R/2PP1P2/7P/3N2NK
Input: Gerd Wilts, 2004-02-20
Last update: Reto, 2023-05-15 more...

26 - P1013094
Paul Raican
Andrey Frolkin
12182 Die Schwalbe 205 02/2004

(13+12) C+
BP in 28,5

1. a4 h5 2. a5 h4 3. a6 h3 4. Ta5 hxg2 5. h4 Th6 6. h5 Tb6 7. h6 g5 8. h7 g4 9. Tg5 f5 10. h8=D f4 11. De5 f3 12. Db5 fxe2 13. f4 g3 14. Sf3 g1=L 15. Lh3 Lc5 16. d4 g2 17. Kd2 e1=T 18. dxc5 Te3 19. c6 Ta3 20. bxa3 d5 21. Kc3 d4+ 22. Kb2 d3 23. Sd4 d2 24. Df3 dxc1=S 25. Td1 Sb3 26. cxb3 g1=D 27. Sc2 Dgd4+ 28. Ka2 Da4 29. bxa4
play all

Moldenhauer: Computerprüfung: C+ Stelvio 1.5 in 00:25:47 Minuten. (hh:mm:ss)
Keine Lösung: BP 28.0. Stelvioprüfung mit 8 Seekern/2 Playern.
Notation: 1.a4 h5 2.a5 h4 3.a6 h3 4.Ta5 hxg2 5.h4 Th6 6.h5 Tb6 7.h6 g5
8.h7 g4 9.Tg5 f5 10.h8=D f4 11.De5 f3 12.Db5 fxe2 13.f4 g3 14.Sf3 g1=L
15.Lh3 Lc5 16.d4 g2 17.Kd2 e1=T 18.dxc5 Te3 19.c6 Ta3 20.bxa3 d5
21.Kc3 d4+ 22.Kb2 d3 23.Sd4 d2 24.Df3 dxc1=S 25.Td1 Sb3 26.cxb3 g1=D
27.Sc2 Dgd4+ 28.Ka2 Da4 29.bxa4 (2023-08-31)
Olaf Jenkner: Wieso cooked? (2023-08-31)
comment

Keywords: Allumwandlung, Ceriani-Frolkin Theme (dtls), Unique Proof Game
Genre: Retro
Computer test: Stelvio 1.5 in 00:25:47
FEN: rnbqkbn1/ppp1p3/PrP5/1Q4R1/P4P2/P4Q1B/K1N5/1N1R4
Reprints: 12182v Die Schwalbe 208 08/2004
(I) Quartz 26 10-12/2004
Input: Gerd Wilts, 2004-02-24
Last update: Silvio Baier, 2023-11-14 more...

27 - P1017460
Gerd Wilts
Messigny 05/2004
5. Preis Retro-Kompositionsturnier

(12+13) C+
BP in 20,0

1. b4 Sa6 2. b5 Sc5 3. b6 Sa4 4. bxc7 b5 5. f4 La6 6. c8=L Db6 7. f5 Dxg1 8. f6 Dxh1 9. fxg7 f5 10. e4 Sf6 11. g8=L Lh6 12. Ld5 Le3 13. Ldb7 0-0 14. d4 Kh8 15. d5 Tg8 16. d6 Tg5 17. dxe7 d5 18. Le6 d4 19. Lg8 Taxg8 20. Lc8 Lxc8
play all

Moldenhauer: Computerprüfung: C+ Stelvio 1.31 11:10:35 Stunden. (hh:mm:ss)
Keine Lösung: BP 19.5. (2023-06-18)
Henrik Juel: White promotes to L on c8 and g8; and these LL switch place, only to be captured
Very impressive (2023-06-18)
comment

Keywords: Ceriani-Frolkin Theme (LL), Unique Proof Game
Genre: Retro
Computer test: Stelvio 1.31
FEN: 2b3rk/p3P2p/5n2/1p3pr1/n2pP3/4b3/P1P3PP/RNBQKB1q
Reprints: idee & form 85 01/2005
Input: Gerd Wilts, 2004-06-03
Last update: Silvio Baier, 2023-08-15 more...

28 - P1017532
Göran Wicklund
(5) Messigny 05/2004

(11+13) C+
BP in 20,0

1. Sf3 a5 2. Sd4 a4 3. Sb3 axb3 4. a4 bxc2 5. a5 cxb1=T 6. a6 Txc1 7. a7 Tc6 8. axb8=S Tf6 9. Sc6 Ta6 10. Se5 Tae6 11. Sg6 c6 12. Sxh8 Da5 13. Sg6 Kd8 14. Se5 Kc7 15. Sg4 Kd6 16. Sh6 Ke5 17. Sxg8 Kf5 18. Sh6+ Kg6 19. Sg4 b6 20. Se5+ Dxe5
play all

Moldenhauer: Computerprüfung: C+ Stelvio 1.11 3 Sekunden.
Keine Lösung: BP 19.0, BP 19.5. (2023-05-01)
comment

Keywords: Ceriani-Frolkin Theme (S), Unique Proof Game, Homebase (w)
Genre: Retro
Computer test: Stelvio 1.11
FEN: 2b2b2/3ppppp/1pp1rrk1/4q3/8/8/1P1PPPPP/R2QKB1R
Input: Gerd Wilts, 2004-06-05
Last update: Silvio Baier, 2023-08-15 more...

29 - P1066688
Andrey Frolkin
Satoshi Hashimoto
12368 Die Schwalbe 208 08/2004

(12+13) C+
BP in 25,5

1. a4 h5 2. a5 h4 3. a6 h3 4. Ta5 hxg2 5. h4 Th6 6. h5 Tc6 7. h6 f5 8. h7 f4 9. Th6 f3 10. Sh3 g1=L 11. Lg2 fxg2 12. f4 Lb6 13. Td6 g1=L 14. Kf1 Lgc5 15. d4 exd6 16. dxc5 Df6 17. cxb6 Dc3 18. Tc5 dxc5 19. f5 Ld6 20. f6 Lh2 21. f7 Ke7 22. h8=T Sf6 23. Txc8 Lg1 24. Th8 Se8 25. Sf2 Kf6 26. Th1
play all

Moldenhauer: Computerprüfung: C+ auch Stelvio 1.4 aber in 4 Sekunden.
Keine Lösung: BP 25.0. (2023-07-29)
comment

Keywords: Ceriani-Frolkin Theme (ll), Unique Proof Game, Pronkin Theme (T)
Genre: Retro
Computer test: Natch 2.3 Copyright (C) 1997,98,99,2001,2002,2003,2004 Pascal Wassong
FEN: rn2n3/pppp1Pp1/PPr2k2/2p5/8/2q5/1PP1PN2/1NBQ1KbR
Input: Gerd Wilts, 2004-08-13
Last update: Arnold Beine, 2020-12-20 more...

30 - 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...

31 - P1068381
Paul Raican
Vlaicu Crisan
624 Quartz 28 07-09/2005

(14+13) C+
BP in 15,0

1. d4 c6 2. d5 Db6 3. d6 Dc7 4. dxc7 d6 5. cxb8=S Lf5 6. Sd7 0-0-0 7. Sf6 gxf6 8. g3 Lh6 9. g4 Lf4 10. g5 Sh6 11. g6 Thg8 12. gxh7 Tg5 13. h8=S Lh7 14. Sg6 Lg8 15. Se5 dxe5
play all

paul: 11.Thg8 (2022-09-16)
comment

Keywords: Ceriani-Frolkin Theme (SS), Unique Proof Game, Homebase (w), Tempo Loss
Genre: Retro
Computer test: Resolution time : 1 mn 54.73 s., Natch 2.3 Copyright (C) 1997,98,99,2001,2002,2003,2004 Pascal Wassong
FEN: 2kr2b1/pp2pp2/2p2p1n/4p1r1/5b2/8/PPP1PP1P/RNBQKBNR
Input: Gerd Wilts, 2006-03-12
Last update: Mario Richter, 2022-09-16 more...

32 - P1068490
Kostas Prentos
Andrey Frolkin
13077 Die Schwalbe 219 06/2006
Werner Keym gewidmet
1. Preis

(10+14) C+
BP in 26.0

1. h4 a5 2. h5 a4 3. h6 a3 4. hxg7 h5 5. g4 Sh6 6. g8=L Lg7 7. g5 Ld4 8. g6 f6 9. Ld5 Lc5 10. Lc6 0-0 11. g7 Kh7 12. g8=T bxc6 13. Tg5 La6 14. Te5 fxe5 15. f4 Tf6 16. f5 Td6 17. f6 Lc4 18. f7 Lxa2 19. f8=D Le6 20. Df3 a2 21. Dd5 axb1=S 22. Ta2 Sc3 23. dxc3 cxd5 24. Kd2 d4 25. Kd3 Lf5+ 26. e4 dxe3ep+
play all

The first known example of the Keym Task.

Henrik Juel: Stelvio 1.31 found the solution immediately and tested it unique in 9 minutes (for the first 25.0 moves) (2023-06-13)
more ...
comment

Keywords: Unique Proof Game, Ceriani-Frolkin Theme (DTLs), Castling, En passant, Valladao Task, Promotion (LTDs), Allumwandlung, Keym Task (The first known prob)
Genre: Retro
Computer test: Natch 3.1 (38 m, utilizing the final ep). Stelvio 1.33, 2min (retracting the e.p. move itself, so full C+)
FEN: rn1q4/2ppp2k/3r3n/2b1pb1p/8/2PKp3/RPP5/2BQ1BNR
Input: Gerd Wilts, 2006-08-05
Last update: Reto, 2023-06-13 more...

33 - P1068641
Michel Caillaud
Moutecidis Fougiaxis Prentos Jubiläumst. 2006
1. Preis
K. Prentos 40 Jahre

(12+12) C+
BP in 19,5

1. b4 h5 2. b5 h4 3. b6 Th5 4. bxa7 Sh6 5. axb8=T Taa5 6. d4 Tag5 7. d5 f5 8. d6 Sf7 9. dxe7 d5 10. c4 Kd7 11. e8=T Df6 12. c5 Lxc5 13. a4 Lb6 14. a5 c5 15. a6 Kc7 16. a7 Ld7 17. a8=L Lxe8 18. Ta7 Kxb8 19. Txb7+ Kxa8 20. Tb8+
play all

Bob Baker: C+ Stelvio 2.0 Solving time: 00:00:39 seconds (2024-02-28)
more ...
comment

Keywords: Unique Proof Game, Schnoebelen Theme (TTL), Anti-Pronkin (T), Prentos Theme (TTL), Ceriani-Frolkin Theme (TTL), Promotion (TTL)
Genre: Retro
Computer test: Natch 3.1 (3:58 h)
FEN: kR2b3/5np1/1b3q2/2pp1prr/7p/8/4PPPP/1NBQKBNR
Reprints: (2) StrateGems 10/2007
Input: Gerd Wilts, 2006-12-21
Last update: A.Buchanan, 2021-02-20 more...

34 - P1080525
Andrey Frolkin
Kostas Prentos
P0190 StrateGems 34 2006
1. Lob

(14+12) C+
BP in 26,5

1. f4 h5 2. f5 h4 3. f6 h3 4. fxe7 hxg2 5. exf8=L Th3 6. Lc5 Tg3 7. Lb6 axb6 8. h4 Taa3 9. h5 Tac3 10. bxc3 Dh4 11. La3 f6 12. Lf8 d6 13. h6 Lf5 14. h7 Ld3 15. exd3 Kf7 16. Df3 Kg6 17. Se2 g1=S 18. h8=T Sh3 19. Th5 Sf4 20. Tb5 Se6 21. Tb2 Db4 22. Th8 Sh6 23. Dg2 Kh5 24. Sc1 g6 25. Lg7 c5 26. Tf8 Sf7 27. Lh8
play all

Henrik Juel: Natch 3.1 did little in half an hour
Stopped at pos. 38 (2018-12-25)
Henrik Juel: Stelvio 1.31 used 18 seconds on my PC (2023-06-13)
more ...
comment

Keywords: Anti-Pronkin (TL), Ceriani-Frolkin Theme (L), Unique Proof Game, Non-standard material, Interchange (LT), Promotion (LsT)
Genre: Retro
Computer test: KP: C+ Stelvio 1.0 (14 seconds)
FEN: 1n3R1B/1p3n2/1p1pnpp1/2p4k/1q6/2PP2r1/PRPP2Q1/RNN1KB2
Input: Gerd Wilts, 2009-01-10
Last update: A.Buchanan, 2023-03-20 more...

35 - P1098713
Guy Sobrecases
Internet-Turnier 28/01/2010
3. Preis Weihnachtsturnier 2009, Retro

(14+14) C+
BP in 9,5
2 Varianten
Immun-Schach

1. e4 b5 2. Se2 b4 3. Sec3 bxc3 4. b4
4. ... La6 5. Lb2 cxb2 6. Sa3 b1=L 7. Txb1 Lb7 8. Tb3 a6 9. Lxa6 Lc8 10. Td3
4. ... a6 5. Lb2 cxb2 6. Sa3 b1=T 7. Lxa6 Tb3! 8. Tb1 Ta7 9. Txb3 Ta8 10. Td3
play all

Judge Michel Caillaud: Composer succeeds in making Schnoebelen promotion less obvious, thanks to using 2 phases with 2 switchbacks as motivation. The need of a black tempo is the trick that allows differentiation of the phases (and the Schnoebelen Rook becomes an "anti-Schnoebelen" Rook!). Well done.

Sobrecases: Specific try play:

1.Sf3? b5 2.b3 b4 3.Ba3 b×a3 4.b4 Bb7 5.S×a3?? B×f3 6.Rb1 Bc6 7.e4 a6 8.B×a6 Bb7 9.Rb3 Bc8 10. Rd3

4.?a6!? 5.S×a3 Bb7 6.Rb1 B×f3?? 7.Rb3 Bc6 8.e4 Bb7 9.B×a6 Bc8 10.Rd3 (2010-04-12)
more ...
comment

Keywords: Unique Proof Game, Immune Chess, Schnoebelen Theme (TL), Prentos Theme, Ceriani-Frolkin Theme, Homebase (s)
Genre: Retro, Fairies
Computer test: Jacobi+
FEN: rnbqkbnr/2pppppp/B7/8/1P2P3/N2R4/P1PP1PPP/3QK2R
Input: Gerd Wilts, 2010-02-02
Last update: A.Buchanan, 2023-06-29 more...

36 - P1100798
Andrey Frolkin
Kostas Prentos
StrateGems 50 04-06/2010
2. ehrende Erwähnung, Good Companions Quick Composing Tourneys, 2010, Beweispartien

(13+12) C+
BP in 20,0

1. g4 a5 2. g5 a4 3. g6 Ta5 4. gxh7 Tg5 5. hxg8=S f5 6. Sf6+ exf6 7. Sc3 La3 8. Sd5 0-0 9. Se7+ Kh8 10. Sg8 De7 11. d4 Dc5 12. d5 d6 13. Dd4 Le6 14. dxe6 Sc6 15. e7 Sa5 16. exf8=T Sb3 17. Tf7 Sxa1 18. b3 Lb2 19. Se7 a3 20. Sc6 bxc6
play all

more ...
comment

Keywords: Anti-Pronkin (S), Ceriani-Frolkin Theme (S), Unique Proof Game, Promenade
Genre: Retro
Computer test: C+ by Natch 3.1 (7 s) No solution in 19.5 Computerprüfung: C+ Stelvio 2.0 1 Sek.
FEN: 7k/2p2Rp1/2pp1p2/2q2pr1/3Q4/pP6/PbP1PP1P/n1B1KBNR
Input: Gerd Wilts, 2010-02-26
Last update: A.Buchanan, 2024-02-12 more...

37 - P1176382
Peter Fayers
v The Problemist 2007
4. ehrende Erwähnung, Abteilung 2

(12+7) cooked
BP in 9,0
Annan Schach

1. Bh2xh7 Bg7-h5 2. Bh7xSg8=L Lf8-h6 3. Lg8xf7+ Ke8xf7 4. Bd2xd7 Th8-e8 5. Bd7xTe8=T Lc8-e6 6. Te8xBe7+ Dd8xTe7 7. Ba2xBa7 Lxe2 8. axb8=S Ta6 9. Sxa6 Lxa6
play all

François Labelle: Cooked by Jacobi:
5... Lg4 6.axa7 Lxe2 7.axb8=S Ta6 8.Sxa6 Lxa6 9.Txe7+ Dxe7+
The cook is also quickly found by Popeye when testing the last 4.5 moves with a=b4.5 (with every version of Popeye that I have installed). (2019-02-09)
paul: Actually, bpPh5 must be in f5, with 1. ...Pg7-f5 in solution. But still cooked: 1.dxd7+ exd7 2.hxh7 df5 3.hxg8=Q Be6 4.Qxh8 Qe7 5.Qxg7 Bxe2 6.Qxf7+ Kxf7 7.axa7 Bh6 8.axb8=S Ra6 9.Sxa6 Bxa6+. (2022-08-17)
comment

Keywords: Annan Chess, Ceriani-Frolkin Theme (TLS), Unique Proof Game, Homebase (w)
Genre: Retro, Fairies
FEN: 8/1pp1qk2/b6b/7p/8/8/1PP2PP1/RNBQKBNR
Reprints: The Problemist , p. 490, 09/2010
Input: Gerd Wilts, 2010-09-11
Last update: A.Buchanan, 2023-06-29 more...

38 - P1177782
Roberto Osorio
Jorge Joaquin Lois
14636 Die Schwalbe 245 10/2010

(12+15) C+
BP in 21,0

1. e4 h5 2. Dg4 hxg4 3. a4 g3 4. Ta3 gxh2 5. Tb3 hxg1=L 6. Th6 a5 7. Ta6 Sc6 8. Tbb6 Tb8 9. Lb5 Lxf2+ 10. Kf1 Ld4 11. Ta8 Lc3 12. Tba6 b6 13. dxc3 Tb7 14. Sd2 Ta7 15. Sb3 Lb7 16. Tc8 Ta8 17. Sc5 Tb8 18. Ta8 La6 19. b3 Tb7 20. Tab8 Ta7 21. Sb7 Ta8
play all

Henrik Juel: The keyword Pure Round Trip (tt) suggests roundtrips by two black rooks; in fact Ta8 does a double roundtrip (2018-12-29)
Henrik Juel: Natch 3.1 did not find the solution in an hour
Stopped at pos. 75
The puzzle in the NW corner is almost impossible for a solver like Natch, whereas a human solver would find it simple, if he got that far is the solving process
The double roundtrip is automatic (2018-12-29)
ras@bsiag.com: Actually, this problem is solvable by computer, tested by Stelvio 0.92 and found to be correct (just one of many PDB problems that will be either C+ or C- in the near future). It took a bit more than 1h. (2022-12-08)
comment

Keywords: Unique Proof Game, Pure Round Trip (tt), Ceriani-Frolkin Theme (l)
Genre: Retro
Computer test: Stelvio 1.0
FEN: rRRqkbnr/1Nppppp1/bpn5/pB6/P3P3/1PP5/2P3P1/2B2K2
Input: Gerd Wilts, 2010-10-07
Last update: Silvio Baier, 2023-03-02 more...

39 - P1189023
Yaakov Mintz
6118 Phénix 194 04/2010

(10+12) C+
BP in 9.5

1. f4 d5 2. f5 d4 3. f6 d3 4. fxe7 dxe2 5. exd8=L exd1=T+ 6. Ke2 Txc1 7. Lxc7 Txb1 8. Lg3 Txa1 9. Le1 Txe1+ 10. Kxe1
play all

Henrik Juel: The double CF is even double Prentos, as the promoted men are captured by officers (2018-12-29)
more ...
comment

Keywords: Ceriani-Frolkin Theme (Lt), Homebase (2), Unique Proof Game, Prentos Theme (Lt), Switchback (K)
Genre: Retro
Computer test: Computerprüfung: C+ Stelvio 1.4 08:35:12 Stunden. (hh:mm:ss) Keine Lösung: BP 9.0.
FEN: rnb1kbnr/pp3ppp/8/8/8/8/PPPP2PP/4KBNR
Input: YM, 2011-03-03
Last update: A.Buchanan, 2023-07-11 more...

40 - P1256160
Bernd Graefrath
14448 Die Schwalbe 242 04/2010
Dem Taoisten Hilmar zum 60. Geburtstag gewidmet

(15+11)
BP in genau 6,0
Tibetschach

1. e3 a6 2. Lxa6 bxa6[=wBa6] 3. Df3 Lb7 4. axb7 Sa6 5. bxa8=D Dxa8 6.Dxa8+ Sb8
play all

Moldenhauer: Computerprüfung: C+ Jacobi v0.7.6 beta1 in 6 Min. (2022-08-18)
comment

Keywords: Unique Proof Game, Tibetan chess, Schnoebelen Theme (D), Anti-Pronkin (D), Prentos Theme, Ceriani-Frolkin Theme
Genre: Retro, Fairies
FEN: Qn2kbnr/2pppppp/8/8/8/4P3/PPPP1PPP/RNB1K1NR
Input: Gerd Wilts, 2012-12-13
Last update: A.Buchanan, 2019-02-03 more...

41 - P1304591
Nicolas Dupont
Andrey Frolkin
R434 Probleemblad 73, p. 66, 04-06/2015

(11+15)
KBP in 36,5

1. d4 c5 2. d5 c4 3. d6 c3 4. dxe7 cxb2 5. c4 d5 6. c5 d4 7. c6 Dd5 8. c7 Kd7 9. e8=T b5 10. Te6 b4 11. Tb6 axb6 12. e4 Ta3 13. e5 La6 14. c8=T Th3 15. Tc6 b3 16. Th6 La3 17. e6+ Kc6 18. e7+ gxh6 19. e8=T Se7 20. Tg8 d3 21. Tg6+ fxg6 22. Dh5 Tf8 23. g4 Tff3 24. Lg2 Tfg3 25. Sf3 gxh5 26. 0-0 d2 27. g5 d1=L 28. Sbd2 b1=D 29. g6 b2 30. g7 Dg6 31. Te1 Sf5 32. Te8 b1=T 33. Th8 Tb4 34. Lb2 Lb3 35. Te1 Ld3 36. Tee8 Sa6 37. Teg8
play all

hans: 1. d4 c5 2. d5 c4 3. d6 c3 4. dxe7 cxb2 5. c4 d5 6. c5 d4 7. c6 Qd5 8. c7 Kd7 9. e8=R b5 10. Re6 b4 11. Rb6 axb6 12. e4 Ra3 13. e5 Ba6 14. c8=R Rh3 15. Rc6 b3 16. Rh6 Ba3 17. e6+ Kc6 18. e7+ gxh6 19. e8=R Ne7 20. Rg8 d3 21. Rg6+ fxg6 22. Qh5 Rf8 23. g4 Rff3 24. Bg2 Rfg3 25. Nf3 gxh5 26. O-O d2 27.g5 d1=B 28. Nbd2 b1=Q 29. g6 b2 30. g7 Qg6 31. Re1 Nf5 32. Re8 b1=R 33. Rh8 Rb4 34. Bb2 Bb3 35. Re1 Bd3 36. Ree8 Na6 37. Reg8

Composers: The content demonstrates one Ceriani-Frolkin rook with thematic square c8, two with thematic square e8, as well as the two original rooks both visiting square e8 (anti-Pronkin). It is now generally accepted that only one ‘supporting’ Ceriani-Frolkin is needed while performing two-fold anti-Pronkin theme on the same thematic square. In particular the second Ceriani-Frolkin with thematic square e8 is not involved in de the double anti-Pronkin part of the entry, and hence should be considered as thematic in itself.
This implies that the full thematic content is two anti-Pronkin rooks on the same square e8, as well as two Ceriani-Frolkin rooks on squares c8 and e8, respectively. This very new, difficult and homogeneous combination was our primary intention – it is symbolized, in the future proof game language developed in the special issue Die Schwalbe 250A, by the notation AP(R,R) & CF(R,R).
Concerning the construction, one has to ensure that the thematic captured pieces are the promoted ones and not the original ones (rebirthed after promotion). This is done here with the white g-pawn standing on g7 and the visible promoted Qg6. This couple may be constructed only when the three black captures gxh6, fxg6xh5 have already occured, and rather early in the game, as the above mentioned Queen is necessarily the first black promotion – among the 3 – which left its thematic square. We hope that it is enough to ensure the soundness of the entry.
Concerning computer analysis, this is over for Euclide after 24. Bg2 (Natch may go a bit further but not much) mainly because both programs are considering that after 24. … Rfg3, this rook may arrive to g3 in 2 moves (probably jumping over the white g-pawn!) This obviously could not be considered as a bug, but certainly as a flaw from those programs. The remaining part of our proof game has been checked with Popeye, using the a=b command. (2016-03-25)
Reto: Stelvio finds the solution quite quickly with v1.17 but full resolution would take weeks if not months with the current code. I'll retry this when Stelvio has improved further. (2023-04-17)
Henrik Juel: Stelvio 1.4 found nothing in 10 minutes
Maybe I was not patient enough, or maybe I should have set some parameters differently (2023-11-14)
comment

Keywords: Unique Proof Game, Anti-Pronkin (TT), Ceriani-Frolkin Theme (TT)
Genre: Retro
FEN: 6RR/6Pp/npk3qp/3q1n1p/1r6/bb1b1Nrr/PB1N1PBP/6K1
Input: A.Buchanan, 2015-06-24
Last update: Silvio Baier, 2023-11-14 more...

42 - P1332546
Nicolas Dupont
528 Julias Fairies 16/04/2014
1st Prize

(14+14)
BP in 16
Disparate Steine

1. d4 Sf6 2. d5 Sh5 3. Dd4 a5 4. Sf3 Ta6 5. d6 Tb6 6. dxc7 Sa6 7. Ld2 d5 8. Sh4 Lg4 9. c8=D Lxe2 10. Kxe2 e5 11. Kf3 Dd7 12. Lb5+ Ke7 13. La4 Ke6 14. Te1 Le7 15. Te2 Db5 16. Le1+ Txc8
play all

It is a fine demonstration of the potential of the fairy condition Disparate. In the solution, a white promotion (into piece X) occurs on square c8 before any move of [Qd8] or [Ke8]. The following move Qd7 proves that X is not a rook (it can still be a queen because of the fairy condition!). The immediately following move Ke7 proves that X is not a knight. Then Ke6 is played, followed by a move by Qd7 which proves that X is not a bishop.
X thus can only be a queen! (We still have to show that the position is legal.) Only after completion of the proof, the promoted queen is captured. It is admirable that the author managed to compose a move sequence obeying all mentioned constraints concerning the move order. A rich demonstration of the fairy condition, exciting to solve.
Henrik Juel: Definition of Disparate from Julia's Fairies:
If one side makes a move with a piece of type “x” (black, white,neutral, half-neutral, etc., King included), the other side cannot answer immediately by moving a piece of the same type “x”.). A pawn promoting is a pawn move.
To me, it is not clear from the definition that 9.c8 is undetermined, and only later is inferred to be 9.c8=Q
Why can White not decide to promote to queen? (2017-03-18)
Henrik Juel: I misunderstood your text, Vlaicu
Now I see that White indeed decides to promote to queen, and your argument shows why the other promotion choices do not work in this proof game (2017-03-18)
Henrik Juel: ... even though the promoted man never moves (2017-03-18)
paul: Jacobi checked the last 12 moves and gave unique solution.
cond disparate
stip dia 4 pieces white Ke1 Qd4 Ra1h1 Bc1f1 Sb1f3 Pa2b2c2e2f2g2h2d5 black Ke8 Qd8 Ra6h8 Bc8f8 Sh5b8 Pa5b7c7d7e7f7g7h7
stip dia 12 forsyth 2r5/1p2bppp/sr2k3/pq1pp2s/B2Q3S/5K2/PPP1RPPP/RS2B3 (2023-07-12)
more ...
comment

Keywords: Schnoebelen Theme, Disparate, Prentos Theme, Ceriani-Frolkin Theme
Genre: Fairies, Retro
FEN: 2r5/1p2bppp/nr2k3/pq1pp2n/B2Q3N/5K2/PPP1RPPP/RN2B3
Input: Vlaicu Crisan, 2017-03-18
Last update: A.Buchanan, 2019-02-03 more...

43 - P1339612
Roberto Osorio
Jorge Joaquin Lois
R496 The Problemist 2015-2016
1. ehrende Erwähnung
The Problemist 2015-2016

(11+14) C+
PG in 20.5

1. c4 d5 2. Db3 Lf5 3. Db6 axb6 4. Sh3 Ta3 5. Tg1 Tc3 6. a4 e6 7. a5 Ke7 8. a6 Kf6 9. a7 Le7 10. a8=D Df8 11. Da4 Txc1+ 12. Dd1 Tc3 13. Ta6 Tf3 14. gxf3 bxa6 15. Tg6+ hxg6 16. Sg1 Th3 17. Db3 Tg3 18. Lh3 Kg5 19. De3+ Kh4 20. Dh6+ gxh6 21. fxg3+
play all

Judge's comment [Silvio Baier]: "Two cross-captures with the same type of captured pieces (QR) are combined with a cross-capture of two black rooks. This is not the highest number of cross- captures in an orthodox proof game (see e.g. P1003984 for comparison), but the pairs are very harmonious and the additional white Q-Pronkin is difficult to implement, and especially the motivation of the promotion of Pa2 is very deep. The check in the diagram position does not detract, since g2-g3+ is also possible with respect to pure retroanalysis."
A.Buchanan: Great problem, but I disagree with the last sentence in Silvio's comment. The alternative at the end g2-g3+ would force an obtrusive bishop. If the composers could have figured out how to do this without the final check, they obviously would have. (2017-09-18)
Henrik Juel: I also like this proof game very much
It seems the kind of problem that is most readily solved by hand; the missing [Lc1] and the missing black rooks might prompt the suspicious solver to consider cross-captures
Euclide did find the solution, but after a long time, and he was not able to verify uniqueness within an hour (2017-09-18)
Moldenhauer: Computerprüfung: C+ Stelvio 1.4 00:01:28 Minute. (hh:mm:ss)
Wegen Retraktion, keine Überprüfung auf 20.0. (2023-07-17)
more ...
comment

Keywords: Unique Proof Game, Cross-capture (DT,DT,tt), Ceriani-Frolkin Theme (D), Impostor (ppppPP)
Genre: Retro
Computer test: Stelvio 1.4
FEN: 1n3qn1/2p1bp2/pp2p1pp/3p1b2/2P4k/5PPB/1P1PP2P/1N2K1N1
Reprints: The Problemist , p. 5, 03/2017
Input: A.Buchanan, 2017-09-18
Last update: Silvio Baier, 2023-08-15 more...

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

(12+14) C+
PG in 32.5

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

Duplicate Diagram: P1214056

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

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

45 - P1384182
Thomas Thannheiser
16054 Die Schwalbe 268, p. 571, 8/2014

(11+9)
Beweispartie in 10,5 Zügen
Schlagschach

1. h4 Sc6 2. h5 Sd4 3. h6 Sxe2 4. hxg7 Sxc1 5. gxh8=T Sxa2 6. Txa2 a5 7. Txa5 Txa5 8. T8xh7 Th5 9. T7xh5 Lg7 10. Th8 Lxh8 11. Txh8
play all

Keywords: Anti-Pronkin, Beweispartie, Ceriani-Frolkin-Thema, Donati-Thema

SB: "Sehr schwer zu lösen, weil kaum Anhaltspunkte in der Diagrammstellung sichtbar sind. Letztendlich schält sich thematisch ein Donati und ein Anti-Pronkin auf weißer Seite heraus. Als Rätsel ok, thematisch zeigt die folgende Aufgabe, was möglich ist." MRic hingegen: "Der wUW-Th8 verlässt sein UW-Feld, nur um später wieder dorthin zurückzukehren und geschlagen zu werden, wonach letztendlich sein Original-Bruder von h1 seinen Tod rächt und seinen Platz auf dem UW-Feld einnimmt. Das ist wieder ein schönes Stück aus dem Hause Thannheiser - kurz, prägnant und witzig, hat mir sehr gut gefallen!" KHS: "Interessant, wie der wT nach h8 gelangt." TZ: "Hier sind die Spuren des sS und whB noch deutlich zu erkennen, so dass die ersten Züge recht klar sind. Die linke mit der rechten Hälfte dann zu verbinden, hat noch ein wenig Mühe gekostet, da ich es länger mit einem wL auf h8 versucht hatte." JB: "Ein starkes T-Duell mit w 'Vorweg-Phönix-Turm' - noch einmal Ceriani-frolkin." HG: "In Fast-Homebase wird ein geschlagener Donati-Turm durch einen Anti-Pronkin-Turm ersetzt. Dupont möchte das allerdings sogar orthodox inzwischen gern doppelt gesetzt haben. Was bei Schlagschachaufgaben in der Regel den Kunstgenuss trübt, sind die (offenbar unumgänglichen) nichtthematischen Schlagfälle, die erkennbar auch die Konstruktion erleichtern."
Moldenhauer: Computerprüfung: C+ Popeye 4.88 in 3 Min. 7 Sek.
keine Lösung in BP10 (2022-08-28)
Henrik Juel: Popeye 4.61 (using 1099 MB) spent 2:03 min., mostly verifying uniqueness (2022-08-29)
Henrik Juel: The non-solution in 10.0 moves took 8 sec. (2022-08-29)
comment

Keywords: Ceriani-Frolkin Theme, Losing Chess, Unique Proof Game, Homebase (s), Donati Theme (T), Anti-Pronkin (T), Prentos Theme (T)
Genre: Retro, Fairies
FEN: 2bqk1nR/1ppppp2/8/8/8/8/1PPP1PP1/1N1QKBN1
Input: RJB, 2014-08-03
Last update: A.Buchanan, 2022-08-29 more...

46 - P1384184
Thomas Thannheiser
16113 Die Schwalbe 269, p. 629, 10/2014
Bernd Gräfrath zum Geburtstag

(11+11)
BP in 10,5
Schlagschach

1. e4 h6 2. Se2 b5 3. a3 Sf6 4. e5 b4 5. exf6 bxa3 6. fxg7 axb2 7. gxh8=T bxa1=T 8. Txh6 Txb1 9. Tb6 Txb6 10. Sc3 Tb1 11. Sxb1
play all

BG: "Dieses Problem bereitete mir erhebliche Lösungsschwierigkeiten. Eine Doppel-Homebase in der Diagrammstellung verrät ja auch nicht allzu viel. Allerdings lassen sich Bauernumwandlungen auf a1 und h8 vermuten. Nun gibt es aber ein Anfangsproblem: Man würde gerne mit 1. e4 b5 starten, aber der sB benötigt Schlagschutz. Also könnte Weiß vielleicht 2. Se2 planen (um diesen Springer später nach b1 zu bringen), aber Schwarz braucht dann zunächst einen Wartezug. Der Zug h7-h6 könnte hilfreich sein, um einen Schnoebelen-König auf h8 darzustellen. Dann ergibt sich aber die Schwierigkeit, dass der sBh6 später auch noch beseitigt werden muss. Umso überraschender ist dann, dass Schwarz zwar h7-h6 zieht, aber ein ganz anderes Thema dargestellt wird; oder besser gesagt: viele Themen, denn es wird ein sehr reichhaltiger Geschenkekorb zum Geburtstag präsentiert, und das unter der restriktiven Voraussetzung der Doppel-Homebase: harmonische Doppelsetzung von gemischtfarbigen Ceriani-Frolkin-Türmen (die schlaglosen Züge wTh6-b6 und sTb6-b1 beweisen, dass es sich nicht um Damen handelte), Rückkehr einer Umwandlungsfigur zu ihrem Umwandlungsfeld b1 (Donati-50-Thema; hier mit der Erweiterung, dass die thematische Figur dort auch noch geschlagen wird), Sibling-Sb1. Herzlichen Dank für die Widmung!" SB: "Natürlich Prentos je einer weißen und schwarzen Figur. Hier musste ich eine ganze Weile probieren, um den Dreh herauszubekommen: Es sind zwei Türme. Der fehlende Sg1 suggeriert bei der halbzahligen Forderung den Sibling-Sb1 und den letzten Zug Sc3xb1. Wieder eine Doppelhomebase-Schlagschach-BP von TT." MRic: "Als kleine Zugabe ein Sibling-Springer auf b1 (aber nicht wirklich überraschend); interessant ist aber das Hauptmenü: Ceriani-Frolkin-Türme, die beide von Figuren geschlagen werden, davon der wCF-T sogar von seinem schwarzen Pendant (!) - Klasse Aufgabe!" HG: "Homebase mit Geschwister-Sb1 und weißem und schwarzem Ceriani-Frolkin-Turm." TZ: "Zwei Prentos-Türme und doppelte Homebase. Sxb1 erfüllt dabei zweifach. Sehr schön gemacht."

Moldenhauer: Computerprüfung: C+ Popeye 4.88 in 1 Std. 26 Min.
Bitte Notation für Player abspielbar machen. Danke! (2022-12-23)
comment

Keywords: Ceriani-Frolkin Theme (Tt), Homebase (2), Losing Chess, Unique Proof Game
Genre: Retro, Fairies
FEN: rnbqkb2/p1pppp2/8/8/8/8/2PP1PPP/1NBQKB1R
Input: RJB, 2014-10-20
Last update: A.Buchanan, 2023-06-03 more...

47 - P1384733
Silvio Baier
Nicolas Dupont
Phénix 2012-2013
1. Preis

(12+14) C+
BP in 27

1. h4 a5 2. h5 a4 3. h6 Ta5 4. hxg7 h5 5. f4 h4 6. f5 h3 7. f6 Th4 8. fxe7 f5 9. b4 Sf6 10. g8=L Lh6 11. Lb3 axb3 12. g4 b2 13. g5 Tg4 14. g6 Lg5 15. g7 Kf7 16. g8=L+ Kg6 17. Lc4 d5 18. e8=T dxc4 19. Te6 Dd3 20. Ta6 bxa6 21. e4 Lb7 22. e5 Le4 23. e6 Te5 24. e7 c5 25. e8=T Sc6 26. Td8 Se8 27. Td4 cxd4
play all

paul: Tested by Stelvio in ~2h (2023-02-02)
comment

Keywords: Ceriani-Frolkin Theme (TTLL), Future Proof Game, Impostor (TTLL)
Genre: Retro
FEN: 4n3/8/p1n3k1/4rpb1/1Pppb1r1/3q3p/PpPP4/RNBQKBNR
Input: fs/hg, 2020-12-30
Last update: Silvio Baier, 2022-03-31 more...

48 - P1384763
Silvio Baier
StrateGems 2015
2. Preis

(14+12) C+
BP in 28

1. f4 g5 2. f5 g4 3. f6 g3 4. fxe7 f5 5. e4 Kf7 6. e8=T f4 7. Te6 f3 8. Tc6 dxc6 9. Lc4+ Kg6 10. d3 f2+ 11. Kd2 f1=D 12. e5 Df5 13. Df3 Dh3 14. gxh3 g2 15. Se2 g1=D 16. e6 Db6 17. e7 Db3 18. axb3 b6 19. Ta5 Lb7 20. Tb5 a5 21. e8=T a4 22. Tee5 a3 23. Le6 a2 24. c4 a1=D 25. Kc2 Da5 26. Sd2 Dc3+ 27. bxc3 Lb4 28. Tec5 bxc5
play all

more ...
comment

Keywords: Ceriani-Frolkin Theme (TTddd), Future Proof Game
Genre: Retro
Computer test: Natch 3.3 Computerprüfung: C+ Stelvio 1.6 in 4 Min. Keine Lösung: BP 27.5. Notation und Diagramm OK.
FEN: rn1q2nr/1bp4p/2p1B1k1/1Rp5/1bP5/1PPP1Q1P/2KNN2P/2B4R
Input: fs/hg, 2020-12-30
Last update: A.Buchanan, 2023-12-25 more...

49 - P1384765
Silvio Baier
StrateGems 2015
4. Preis

(12+16) C+
BP in 27.5

1. d4 d5 2. Lh6 gxh6 3. g4 h5 4. g5 Lh6 5. g6 Lg5 6. g7 Sh6 7. g8=S Kd7 8. Sf6+ exf6 9. b4 Te8 10. b5 Te3 11. b6 Tf3 12. e4 c5 13. Lc4 dxc4 14. e5 c3 15. e6+ Kd6 16. e7 Le6 17. e8=L Lb3 18. Lb5 Sc6 19. Lf1 c4 20. d5 Kc5 21. d6 Se7 22. d7 De8 23. d8=S a5 24. Sc6 bxc6 25. b7 Td8 26. b8=L a4 27. Lf4 Td6 28. Lc1
play all

Vladimir Rey: FEN Misprint! Correct: a7 = a4 (2022-10-26)
James Malcom: Fixed. (2022-10-26)
comment

Keywords: Homebase (w), Ceriani-Frolkin Theme (SS), Pronkin Theme (LL), Future Proof Game, Promotion (SLSL)
Genre: Retro
Computer test: Natch 3.3
FEN: 4q3/4np1p/2pr1p1n/2k3bp/p1p5/1bp2r2/P1P2P1P/RNBQKBNR
Input: fs/hg, 2020-12-30
Last update: Silvio Baier, 2023-02-02 more...

50 - 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...

51 - P1394894
Silvio Baier
WCCC Rhodes 10/2021
1st Prize Champagne-TT A

(11+15) C+
BP in 28.0

1. h4 a5 2. h5 a4 3. h6 a3 4. hxg7 axb2 5. a4 Ta6 6. a5 Tb6 7. a6 h5 8. a7 h4 9. a8=D Th5 10. Da2 Ta5 11. f4 e5 12. De6+ fxe6 13. f5 Kf7 14. f6 Kg6 15. f7 Ld6 16. f8=D Sa6 17. Df3 Df6 18. Dd5 Se7 19. g8=T+ Kf5 20. Tg4 exd5 21. Tc4 dxc4 22. g4+ Kf4 23. g5 Sc5 24. g6 Sa4 25. g7 c5 26. g8=T Lc7 27. Tg3 Dd6 28. Tb3 cxb3
play all

Reto: Nachdem Stelvio v1.0 noch 24h dafür gebraucht hat, ist Stelvio 1.2 in gut 5min damit durch. (2023-05-10)
comment

Keywords: Unique Proof Game, Homebase (w), Champagne-TT (2021), Ceriani-Frolkin Theme (DDTT), Future Proof Game
Genre: Retro
Computer test: Natch 3.3
FEN: 2b5/1pbpn3/1r1q4/r1p1p3/n4k1p/1p6/1pPPP3/RNBQKBNR
Input: A.Buchanan, 2021-10-25
Last update: Silvio Baier, 2022-03-31 more...

52 - P1404841
Silvio Baier
StrateGems 2011
1. ehrende Erwähnung

(13+14) C+
BP in 18.0

1. d4 g5 2. d5 Lg7 3. d6 Kf8 4. dxc7 d5 5. a4 Dd7 6. a5 Dh3 7. a6 Lg4 8. axb7 a5 9. c8=L Ta6 10. Le6 Txe6 11. b4 Sa6 12. b8=L f5 13. Le5 Lxe5 14. b5 Sf6 15. b6 Tg8 16. b7 Tg6 17. b8=L Th6 18. Ld6 Lxd6
play all

Henrik Juel: C+ Euclide 1.01 (2022-10-03)
comment

Keywords: bi-coloured Bristol, black Bristol, Prentos Theme (LLL), Homebase, Ceriani-Frolkin Theme (LLL)
Genre: Retro
FEN: 5k2/4p2p/n2brn1r/p2p1pp1/6b1/7q/2P1PPPP/RNBQKBNR
Reprints: zu 18879 Die Schwalbe 316, p. 650, 08/2022
Input: Gunter Jordan, 2022-10-03
Last update: Silvio Baier, 2023-02-02 more...

53 - P1408188
Gerold Schaffner
11. WCCT 2022
59. - 61. Platz
11. WCCT 2020-2022
Abt. Retro

(12+12) C+
BP in 9.0

1. c4 a5 2. c5 a4 3. c6 a3 4. cxb7 axb2 5. bxa8=S bxc1=T 6. Sb6 Tc2 7. Sxd7 Txa2 8. Sxf8 Ta8 9. Da4+ Kxf8
play all

Thema: Kombination der Themen Pronkin und Ceriani-Frolkin auf demselben Themafeld.

Henrik Juel: C+ Stelvio 1.0
No solution in 8.5 moves (2023-03-11)
Henrik Juel: [Pc2] promotes by capturing [Ta8] to S, which is later captured
[Pa7] promotes to T, which later goes to a8 (2023-03-11)
comment

Keywords: Ceriani-Frolkin Theme (S), Pronkin Theme (t), Unique Proof Game
Genre: Retro
FEN: rnbq1knr/2p1pppp/8/8/Q7/8/3PPPPP/RN2KBNR
Reprints: 33) idee & form 158, p. 5370, 04/2023
Input: Gunter Jordan, 2023-03-11
Last update: Gunter Jordan, 2023-03-11 more...

54 - P1408190
Silvio Baier
11. WCCT 2022
1. Platz
11. WCCT, 2020-2022
Abt. Retro

(13+13) C+
BP in 30.0

1. e4 f5 2. e5 Sf6 3. exf6 e5 4. h4 e4 5. h5 e3 6. h6 e2 7. hxg7 h5 8. g8=D h4 9. Db3 h3 10. Db6 axb6 11. g4 Ta3 12. Lg2 Tc3 13. dxc3 h2 14. Lh6 f4 15. Kd2 e1=T 16. Sh3 Te5 17. Te1 h1=S 18. g5 Sg3 19. g6 Sf5 20. g7 Se7 21. g8=L Lg7 22. Lc4 d5 23. a4 0-0 24. a5 Kh8 25. a6 Sg8 26. a7 De7 27. a8=D dxc4 28. Da3 Ta5 29. Dc5 Ta8 30. Ta5 bxc5
play all

Thema: Kombination der Themen Pronkin und Ceriani-Frolkin auf demselben Themafeld.

Henrik Juel: Stelvio 1.0 found the solution in a couple of minutes
Testing was stopped after half an hour, and no cooks were found (2023-03-11)
comment

Keywords: Allumwandlung, Ceriani-Frolkin Theme (DLD), Unique Proof Game, konsekutive Umwandlungen 5 (DtsLD), Pronkin Theme (st), Castling
Genre: Retro
Computer test: Stelvio 1.0
FEN: rnb2rnk/1pp1q1b1/5P1B/R1p5/2p2p2/2P4N/1PPK1PB1/1N1QR3
Reprints: 31) idee & form 158, p. 5370, 04/2023
Input: Gunter Jordan, 2023-03-11
Last update: Silvio Baier, 2023-03-20 more...

55 - P1408191
Gerold Schaffner
11. WCCT 2022
59. - 61. Platz
11. WCCT 2020-2022
Abt. Retro

(12+13) C+
BP in 9.5

1. a4 e5 2. Ta3 e4 3. Tf3 exf3 4. a5 fxg2 5. a6 gxf1=S 6. axb7 Se3 7. bxc8=L Sxd1 8. Lb7 Se3 9. Lg2 Sf1 10. Lxf1
play all

Thema: Kombination der Themen Pronkin und Ceriani-Frolkin auf demselben Themafeld.

Henrik Juel: C+ Stelvio 1.0
No solution in 9.0 moves (2023-03-11)
comment

Keywords: Ceriani-Frolkin Theme (s), Unique Proof Game, Pronkin Theme (L), Switchback (s)
Genre: Retro
FEN: rn1qkbnr/p1pp1ppp/8/8/8/8/1PPPPP1P/1NB1KBNR
Reprints: 34) idee & form 158, p. 5370, 04/2023
Input: Gunter Jordan, 2023-03-11
Last update: Gunter Jordan, 2023-03-11 more...

56 - P1408358
Andrew Buchanan
10 Problemas 36, p. 1190, 10/2021

(15+13) C+
PG in 14.5

1. e4 c5 2. Lb5 c4 3. Sf3 c3 4. 0-0 cxd2 5. c4 f6 6. Db3 d1=L 7. Lh6 Kf7 8. c5+ d5 9. cxd6ep+ Kg6 10. Se5+ Kh5 11. Le8+ g6 12. Lg7 Lh3 13. gxh3 Lg4 14. f3 Kh4 15. fxg4
play all

Objective: co-record shortest achievement of task, followed by artistic continuation.
Also version rnbqBbnr/pp2p1Bp/3P1pp1/4N2k/4P3/1Q5P/PP3P1P/RN1R2K1 PG in 14.0 mentioned in article. This offers different artistic continuation (with Pronkin instead of Ceriani-Frolkin).
more ...
comment

Keywords: Unique Proof Game, Valladao Task, Castling (wk), En passant, Promotion (l), Prenix (l), Ceriani-Frolkin Theme (l)
Genre: Retro
Computer test: HJ: C+ Stelvio 1.0
FEN: rn1qBbnr/pp2p1Bp/3P1pp1/4N3/4P1Pk/1Q5P/PP5P/RN3RK1
Input: A.Buchanan, 2023-03-19
Last update: A.Buchanan, 2023-03-20 more...

57 - P1408360
Andrew Buchanan
8 Problemas 36, p. 1190, 10/2021

(13+13) C+
PG in 11.5

1. d3 e5 2. Sd2 e4 3. Sdf3 exf3 4. b4 fxe2 5. La3 exf1=S 6. Dg4 Ke7 7. 0-0-0 Kd6 8. b5+ c5 9. bxc6ep+ Kc7 10. Dxd7 Kb6 11. g4 Sg3 12. hxg3
play all

Objective: co-record shortest achievement of task, followed by artistic continuation.
more ...
comment

Keywords: Unique Proof Game, Valladao Task, Castling (wg), En passant, Promotion (s), Ceriani-Frolkin Theme (s)
Genre: Retro
Computer test: HJ: C+ Stelvio 1.0
FEN: rnbq1bnr/pp1Q1ppp/1kP5/8/6P1/B2P2P1/P1P2P2/2KR2NR
Input: A.Buchanan, 2023-03-19
Last update: A.Buchanan, 2023-03-20 more...

58 - P1409844
Bernd Graefrath
5 Phénix 331, p. 12922, 06/2022

(13+12) C+
PG in 10.0

1. h4 a5 2. h5 a4 3. h6 a3 4. hxg7 axb2 5. gxh8=S bxa1=D 6. Sxf7 De5 7. Sxd8 Dh5 8. Sc6 Sxc6 9. Lb2 Sa7 10. Lh8 Lg7
play all

more ...
comment

Keywords: Unique Proof Game, RIFACE Retro Solving Tourney (2022), Promotion (Sd), Ceriani-Frolkin Theme (S), Prentos Theme (S), Prenix (d)
Genre: Retro
Computer test: C+ by Euclide 1.01, who found no solutions in 9.5 and 9.0 moves
FEN: r1b1k1nB/npppp1bp/8/7q/8/8/P1PPPPP1/1N1QKBNR
Input: A.Buchanan, 2023-05-20
Last update: A.Buchanan, 2023-05-20 more...

59 - P1411261
Silvio Baier
SS078 The Hopper Magazine I03 30/12/2022

(13+13) C+
PG in 27.0

1. f2-f4 h7-h5 2. f4-f5 h5-h4 3. f5-f6 h4-h3 4. f6xe7 h3xg2 5. e7xd8=L Lf8-b4 6. h2-h4 c7-c5 7. Ld8-b6 a7xb6 8. Th1-h3 Ke8-d8 9. Th3-c3 Kd8-c7 10. Sg1-h3 g2-g1=D 11. h4-h5 Dg1-g5 12. h5-h6 Dg5-d8 13. h6-h7 Sg8-h6 14. a2-a3 Th8-e8 15. h7-h8=D g7-g5 16. Dh8-f6 g5-g4 17. Df6-c6+ b7xc6 18. a3xb4 Lc8-a6 19. Ta1-a3 La6-d3 20. Ta3-b3 Ld3-h7 21. e2-e4 Ta8-a3 22. Lf1-a6 g4-g3 23. d2-d3 g3-g2 24. Lc1-d2 g2-g1=L 25. Ke1-f1 c5-c4 26. Ld2-e1 Lg1-c5 27. Sh3-f2 Lc5-f8
play all

Henrik Juel: solution
1.Pf2-f4 Ph7-h5 2.Pf4-f5 Ph5-h4 3.Pf5-f6 Ph4-h3 4.Pf6xe7 Ph3xg2
5.Pe7xd8=B Bf8-b4 6.Ph2-h4 Pc7-c5 7.Bd8-b6 Pa7xb6 8.Rh1-h3 Ke8-d8
9.Rh3-c3 Kd8-c7 10.Sg1-h3 Pg2-g1=Q 11.Ph4-h5 Qg1-g5 12.Ph5-h6 Qg5-d8
13.Ph6-h7 Sg8-h6 14.Pa2-a3 Rh8-e8 15.Ph7-h8=Q Pg7-g5 16.Qh8-f6 Pg5-g4
17.Qf6-c6+ Pb7xc6 18.Pa3xb4 Bc8-a6 19.Ra1-a3 Ba6-d3 20.Ra3-b3 Bd3-h7
21.Pe2-e4 Ra8-a3 22.Bf1-a6 Pg4-g3 23.Pd2-d3 Pg3-g2 24.Bc1-d2 Pg2-g1=B
25.Ke1-f1 Pc5-c4 26.Bd2-e1 Bg1-c5 27.Sh3-f2 Bc5-f8 (2023-07-27)
Henrik Juel: Superb technique
Double Frolkin-Ceriani (LD) and double Pronkin (Dd8,Lf8) (2023-07-27)
more ...
comment

Keywords: Unique Proof Game, Pronkin Theme (dl), Ceriani-Frolkin Theme (DL)
Genre: Retro
Computer test: C+ Stelvio 1.4, no solution in 26.5
FEN: 1n1qrb2/2kp1p1b/Bpp4n/8/1Pp1P3/rRRP4/1PP2N2/1N1QBK2
Input: Miguel Ambrona, 2023-07-26
Last update: Silvio Baier, 2023-08-15 more...

60 - P1411262
Silvio Baier
SS077 The Hopper Magazine I03 30/12/2022

(12+12) C+
PG in 23.0

1. f2-f4 h7-h5 2. f4-f5 h5-h4 3. f5-f6 h4-h3 4. f6xe7 h3xg2 5. e7xf8=L Th8-h3 6. Lf8-b4 Th3-b3 7. h2-h4 g7-g5 8. Sg1-h3 g2-g1=L 9. h4-h5 Lg1-c5 10. h5-h6 Ke8-f8 11. h6-h7 Kf8-g7 12. h7-h8=T Lc5-f8 13. Th8-h6 c7-c5 14. Th6-c6 d7xc6 15. a2xb3 Dd8-d3 16. e2xd3 g5-g4 17. Dd1-f3 g4-g3 18. Lf1-e2 g3-g2 19. Ke1-f2 c5xb4 20. Th1-d1 g2-g1=T 21. Ta1-a3 Tg1-h1 22. Kf2-g3 b4xa3 23. Sh3-f2 Th1-h8
play all

Henrik Juel: solution
1.Pf2-f4 Ph7-h5 2.Pf4-f5 Ph5-h4 3.Pf5-f6 Ph4-h3 4.Pf6xe7 Ph3xg2
5.Pe7xf8=B Rh8-h3 6.Bf8-b4 Rh3-b3 7.Ph2-h4 Pg7-g5 8.Sg1-h3 Pg2-g1=B
9.Ph4-h5 Bg1-c5 10.Ph5-h6 Ke8-f8 11.Ph6-h7 Kf8-g7 12.Ph7-h8=R Bc5-f8
13.Rh8-h6 Pc7-c5 14.Rh6-c6 Pd7xc6 15.Pa2xb3 Qd8-d3 16.Pe2xd3 Pg5-g4
17.Qd1-f3 Pg4-g3 18.Bf1-e2 Pg3-g2 19.Ke1-f2 Pc5xb4 20.Rh1-d1 Pg2-g1=R
21.Ra1-a3 Rg1-h1 22.Kf2-g3 Pb4xa3 23.Sh3-f2 Rh1-h8 (2023-07-27)
Henrik Juel: Very impressive
Double Frolkin-Ceriani (LT) and double Pronkin (Lf8,Th8) (2023-07-27)
more ...
comment

Keywords: Unique Proof Game, Pronkin Theme (tl), Ceriani-Frolkin Theme (TL)
Genre: Retro
Computer test: C+ Stelvio 1.4, no solution in 22.5
FEN: rnb2bnr/pp3pk1/2p5/8/8/pP1P1QK1/1PPPBN2/1NBR4
Input: Miguel Ambrona, 2023-07-26
Last update: Silvio Baier, 2023-11-11 more...

61 - P1411296
Joachim Hambros
SS045 The Hopper Magazine I02 25/6/2022

(12+16) C+
PG in 27.0

1. e2-e4 Sg8-f6 2. Dd1-h5 Th8-g8 3. Dh5-h6 g7xh6 4. e4-e5 Tg8-g4 5. e5-e6 Tg4-h4 6. g2-g4 Lf8-g7 7. g4-g5 Sf6-g4 8. g5-g6 Lg7-f6 9. g6-g7 Lf6-g5 10. g7-g8=S Ke8-f8 11. Sg8-f6 e7xf6 12. e6-e7+ Kf8-g7 13. e7-e8=S+ Kg7-g6 14. Se8-d6 c7xd6 15. c2-c4 Dd8-b6 16. c4-c5 Db6-b3 17. c5-c6 b7-b5 18. c6-c7 Lc8-b7 19. c7-c8=S Lb7-g2 20. Sc8-b6 a7xb6 21. a2-a4 Ta8-a7 22. a4-a5 Ta7-c7 23. a5-a6 Tc7-c4 24. a6-a7 Tc4-a4 25. a7-a8=D Ta4-a6 26. Da8-f3 Sb8-c6 27. Df3-d1 Lg2-d5
play all

Henrik Juel: Very good proof game
Triple Frolkin-Ceriani (SSS) and Pronkin (Dd1)
White homebase and nice play by [Ta8,Lc8] (2023-07-27)
Joachim Hambros: Main content anticipated by P0008910 (2024-02-14)
more ...
comment

Keywords: Unique Proof Game, Ceriani-Frolkin Theme (SSS), Pronkin Theme (Dd1), Homebase
Genre: Retro
Computer test: C+ Stelvio 1.4, no solution in 26.5
FEN: 8/3p1p1p/rpnp1pkp/1p1b2b1/6nr/1q6/1P1P1P1P/RNBQKBNR
Input: Miguel Ambrona, 2023-07-27
Last update: A.Buchanan, 2024-02-14 more...

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