Die Schwalbe

31 problem(s) found in 2054 milliseconds (displaying 31 problem(s)). [COMMENTDATE>=20220810 AND G='Retro' AND NOT K='Cross-capture' AND K='Reiner Rundlauf'] [download as LaTeX]

1 - P0005207
Luigi Ceriani
The Fairy Chess Review 08/1949
P0005207
(10+11)
Orthorekonstruktion N=23
BTM: 1. ... Kb2 2. La7 Ka3 3. Lb6 Ka4 4. Lc7 Kb5 5. Lb6 Ka6 6. Lc7 Ka7 7. Lb6+ Kb8 8. La7+ Kc7 9. Lb6+ Kd7 10. Lc7 Ke7 11. Lb6 Kf8 12. Lc7 Kg7 13. Lb6 Kh6 14. Lc7 Kg5 15. Lb6 Kf5 16. Lc7 Ke5 17. Lb6 Kd5 18. Lc7 Kc4 19. Lb6 Kb5 20. Lc7 Ka4 21. Lb6 Ka3 22. Lc7 Kb2 23. Lb8 Ka1

WTM: 1. La7 Kb2 2. Lb6 Ka3 3. Lc7 Ka4 4. Lb6 Kb5 5. Lc7 Kc4 6. Lb6 Kd5 7. Lc7 Ke5 8. Lb6 Kf5 9. Lc7 Kg5 10. Lb6 Kh6 11. Lc7 Kg7 12. Lb6 Kf8 13. Lc7 Ke7 14. Lb6 Kd7 15. La7 Kc7 16. Lb6+ Kb8 17. Lc7+ Ka7 18. Lb6+ Ka6 19. Lc7 Kb5 20. Lb6 Ka4 21. Lc7 Ka3 22. Lb6 Kb2 23. Lc7 Ka1 24. Lb8
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Die kürzestmögliche OR erfordert 23 schwarze Züge (C+), die Zugfolge ist nicht eindeutig.
In "32 personaggi e 1 autore" (p.533) fälschlich ohne wBb7 abgedruckt (aber mit korrekter Steinkontrolle 10+11). Die Korrektur ist nachzulesen in "La genesi delle posizioni" (p.217).
Henrik Juel: The task of changing who has the move can be accomplished in 15 black moves:
1.La7 Kb2 .. 6.Lb8 Kb7 7.La7 Kc7 8.Lb8+ Kc8 9.La7 Kb7 .. 15.La7 Ka1 16.Lb8,
or, if it is Black to move:
1... Kb2 2.La7 Ka3 .. 6.La7 Kb7 7.Lb8 Kc8 8.La7 Kc7 9.Lb8+ Kb7 .. 15.Lb8 Ka1 (2012-07-26)
Mario Richter: Since the wL can lose a tempo on b6-d8, the OR can be done even faster:
WTM: 1.La7 Sb7 2.Lb6 Kb2 3.Ld8 Ka1 4.Lc7 Sd8 5.Lb8
BTM: 1. ... Sb7 2.La7 Sd8 3.Lb6 Sb7 4.Ld8 Kb2 5.Lc7 Sd8 6.Lb8 Ka1
My guess: diagram error. (2012-07-26)
TBr: Indeed, Mario, a diagram error just in "32 personaggi e 1 autore" (p.533), where the diagram is given as here -- but with piece count 10+11!
Correction in "La genesi delle posizioni" (p.217): Add white Pawn b7. (2012-07-26)
Henrik Juel: With a white pawn added on b7, the play by black king is a1-b2-a3-a4-b5 followed by a round trip, the orientation of which depends on who has the move, like in P0005205 (2012-07-26)
A.Buchanan: For an article I am writing, does anyone have any pithy quotes by Ceriani about ortho-reconstruction, preferably in Italian, please? (2023-08-10)
comment
Keywords: Ortho-reconstruction, Königswanderung, Pure Round Trip (k)
Genre: Retro
FEN: 1B1n4/1P3P2/2ppppP1/p1P4p/8/2Pp1PP1/P2p4/kb1K4
Reprints: 13 32 personaggi e 1 autore 1955
Input: Gerd Wilts, 1995-06-03
Last update: A.Buchanan, 2023-08-10 more...
2 - P0009122
Satoshi Hashimoto
2950 Phénix 69 12/1998
P0009122
(15+10) C+
BP in 19,0
1. h4 g5 2. hxg5 e5 3. Txh7 Df6 4. Txf7 Th3 5. g4 Te3 6. dxe3 Lb4+ 7. Ld2 d6 8. Lc3 Le6 9. Dd4 Lxa2 10. Sd2 Ld5 11. Txa7 Lf3 12. exf3 Se7 13. Ld3 Kd7 14. Kf1 Kc6 15. Kg2 Sd7 16. Kg3 Th8 17. Ta8 Th1 18. Sh3 Ta1 19. Tc8 Ta8
play all play one stop play next play all
Moldenhauer: Computerprüfung: Stelvio 1.4 Keine Lösung: BP 18.5. (2023-08-17)
comment
Keywords: Unique Proof Game, Pure Round Trip (t)
Genre: Retro
Computer test: Resolution time : 54.34 s., Natch 2.3 Copyright (C) 1997,98,99,2001,2002,2003,2004 Pascal Wassong
FEN: r1R5/1ppnnR2/2kp1q2/4p1P1/1b1Q2P1/2BBPPKN/1PPN1P2/8
Reprints: 2 64 Proof Games 2012
Input: Gerd Wilts, 1999-02-27
Last update: Gerd Wilts, 2012-12-23 more...
3 - P0009132
Michel Caillaud
R042 Probleemblad 01/1999
P0009132
(13+15) C+
BP in 24,0
1. g4 c5 2. Lg2 Da5 3. Lc6 Dxa2 4. Lb5 Dd5 5. Ta6 Sh6 6. Tc6 dxc6 7. b3 Lf5 8. Lb2 Sd7 9. Lf6 exf6 10. g5 Ld6 11. g6 Ke7 12. gxh7 Thb8 13. h8=T a5 14. Tc8 a4 15. Tc7 Th8 16. f3 Ke8 17. Kf2 Lf8 18. Kg3 a3 19. Kh4 Ta4+ 20. Kh5 Tg4 21. d4 Sb8 22. Dd3 Dd8 23. Sd2 Lc8 24. Dh7 Sg8
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Switchback von 7 schwarzen Figuren, davon nur einer mit Schlag!
Henrik Juel: Natch 3.1 made no progress after half an hour (2018-12-13)
more ...
comment
Keywords: Unique Proof Game, Pure Round Trip (d), Switchback (sldklst), Promotion (T)
Genre: Retro
Computer test: Moldenhauer: Computerprüfung: C+ Stelvio 1.11 00:03:45 Minuten. (hh:mm:ss) Keine Lösung: BP 23.0, BP 23.5.
FEN: 1nbqkbnr/1pR2ppQ/2p2p2/1Bp4K/3P2r1/pP3P2/2PNP2P/6NR
Input: Gerd Wilts, 1999-02-27
Last update: A.Buchanan, 2023-04-01 more...
4 - P0009151
Gianni Donati
R038 Probleemblad 09/1998
Michel Caillaud gewidmet
1. Lob
P0009151
(14+15) C+
BP in 22,0
1. h4 Sf6 2. h5 Sd5 3. h6 gxh6 4. Sf3 Lg7 5. Tg1 Lc3 6. Se5 Kf8 7. f3 Kg7 8. Kf2 Dg8 9. Kg3 Kf8+ 10. Kh4 Dg6 11. d4 Db6 12. Kh5 Db3 13. axb3 Ke8 14. Ta6 Kd8 15. Tf6 exf6 16. Sa3 Se7 17. d5 Te8 18. Dd4 Sg8 19. Da4 Lb4 20. c4 Lf8 21. Sc2 Te7 22. Se1 Ke8
play all play one stop play next play all
more ...
comment
Keywords: Unique Proof Game, Round Trip (k), Pure Round Trip (sl)
Genre: Retro
Computer test: Computerprüfung: C+ Stelvio 1.0 00:08:49 Minuten. (hh:mm:ss) Keine Lösung: BP 21.0, BP 21.5.
FEN: rnb1kbn1/pppprp1p/5p1p/3PN2K/Q1P5/1P3P2/1P2P1P1/2B1NBR1
Input: Gerd Wilts, 1999-02-27
Last update: A.Buchanan, 2023-03-13 more...
5 - P0009164
Satoshi Hashimoto
PR16 Problem Paradise 12 01-03/1999
1. Preis
P0009164
(13+14) C+
BP in 21,5
1. a4 Sc6 2. a5 Tb8 3. a6 bxa6 4. Ta4 Tb3 5. Th4 Tc3 6. dxc3 g5 7. Dd6 exd6 8. Le3 Df6 9. Sd2 Df3 10. exf3 g4 11. Ld3 g3 12. Se2 gxh2 13. Sg3 h5 14. Ke2 Lh6 15. Ta1 h1=T 16. Taa4 Ta1 17. Th1 Ta2 18. Ta1 Sd4+ 19. Ke1 Sb5 20. Tah4 c5 21. Th1 h4 22. Lf1
play all play one stop play next play all
Henrik Juel: Natch 3.1 made no progress after half an hour (2018-12-13)
Moldenhauer: Computerprüfung: C+ Stelvio 1.11 00:06:29 Minuten. (hh:mm:ss)
Keine Lösung: BP 20.5, BP 21.0. (2023-03-16)
comment
Keywords: Unique Proof Game, Pure Round Trip (TT)
Genre: Retro
Computer test: Stelvio 1.11, Natch
FEN: 2b1k1nr/p2p1p2/p2p3b/1np5/7p/2P1BPN1/rPPN1PP1/R3KB1R
Reprints: feenschach 153 10-12/2003
9 64 Proof Games 2012
Input: Gerd Wilts, 1999-02-27
Last update: Silvio Baier, 2023-03-20 more...
6 - P0009165
Michel Caillaud
PR17 Problem Paradise 12 01-03/1999
3. ehrende Erwähnung
P0009165
(15+13) C+
BP in 22,5
1. f4 Sc6 2. f5 Tb8 3. f6 exf6 4. a4 Lb4 5. a5 Lc3 6. dxc3 De7 7. Le3 De5 8. Lxa7 b6 9. a6 Tb7 10. Lb8 Sge7 11. a7 Tg8 12. a8=L Ta7 13. Lb7 Ta8 14. h4 Sa7 15. Le4 d5 16. Lxh7 g6 17. h5 Tg7 18. h6 Dh5 19. Lg8 Lf5 20. h7 Sec8 21. h8=D Th7 22. Dg7 Th8 23. Dh7
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Rundlauf der sTT a8 und h8.
Henrik Juel: Natch 3.1 made no progress after half an hour (2018-12-13)
Moldenhauer: Computerprüfung: C+ Stelvio 1.0 27:15:46 Stunden.
Keine Lösung: BP 21.5, BP 22.0. (2023-02-18)
comment
Keywords: Unique Proof Game, Pure Round Trip (tt), Promotion
Genre: Retro
Computer test: Stelvio 1.0
FEN: rBn1k1Br/n1p2p1Q/1p3pp1/3p1b1q/8/2P5/1PP1P1P1/RN1QKBNR
Input: Gerd Wilts, 1999-02-27
Last update: Silvio Baier, 2023-03-03 more...
7 - P1000219
Mark Kirtley
10414v Die Schwalbe 177 06/1999
Michel Caillaud gewidmet
P1000219
(16+10)
BP in 21,0
1. e4 a5 2. Dh5 Ta6 3. Dxa5 Th6 4. Da8 Sa6 5. Dxc8 Th5 6. Da8 h6 7. Dxa6 Da8 8. Dg6 Kd8 9. Dh7 Kc8 10. Dxg8 Kb8 11. Dxf8+ Ka7 12. Dxa8+ Kb6 13. Da5+ Kc6 14. La6 Kd6 15. d3 Ke6 16. Ld2 Kf6 17. Lb4 Kg6 18. Kd2 Kh7 19. Kc3 Kg8 20. Sd2 Kf8 21. Te1 Ke8
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14zügiger Rundlauf des sK
Korrektur in "Die Schwalbe" 181, 02/2000, S.377
Henrik Juel: Natch 3.1 did nothing in more than 3 hours (2018-12-13)
Vladimir Rey: I guess, FEN-misprint. Correct e3 = e4, probably. If p. e3: dual 8. Da6-d3 (2022-11-06)
Moldenhauer: Computerprüfung: Cooked Stelvio 1.5 wenn Bauer auf e3 steht.
Lösezeit: 70:23:07 Stunden. (hh:mm:ss) Keine Lösung: BP 20.5 ca. 22 Std.
Herr Vladimir Rey hat dies schon festgestellt.
8.Da6-d3 Ke8-d8 9.Dd3-h7 Kd8-c8
8.Da6-g6 Ke8-d8 9.Dg6-h7 Kd8-c8
Computerprüfung: C+ Stelvio 1.5 wenn Bauer auf e4 steht.
Lösezeit: 87:04:40 Stunden. Keine Lösung: BP 20.5 ca. 31Std.
Notation ist bereits für Bauer auf e4 richtig.
Richtige FEN: 4k2r/1pppppp1/B6p/Q6r/1B2P3/2KP4/PPPN1PPP/4R1NR
Die Strategien für e3 2944615/ e4 3379466 gerechnet mit 20/21 Playern. (2023-08-28)
comment
Keywords: Unique Proof Game, Pure Round Trip (k)
Genre: Retro
FEN: 4k2r/1pppppp1/B6p/Q6r/1B6/2KPP3/PPPN1PPP/4R1NR
Reprints: 10414 Die Schwalbe 181 02/2000
Input: Gerd Wilts, 2000-08-01
Last update: Alfred Pfeiffer, 2018-12-14 more...
8 - P1000627
Satoshi Hashimoto
R061 Probleemblad 07/1999
P1000627
(14+15) C+
BP in 18,0
1. e3 f5 2. Lb5 f4 3. Lc6 dxc6 4. Se2 Dd5 5. Tg1 Df3 6. gxf3 Lh3 7. Tg6 Lf1 8. Td6 g5 9. b4 g4 10. Lb2 g3 11. Ld4 g2 12. c3 g1=D 13. Dc2 Dg5 14. Sg3 La6 15. Df5 b5 16. Kf1 exd6 17. Kg1 Dd8 18. Sf1 Lc8
play all play one stop play next play all
Moldenhauer: Computerprüfung: Keine Lösung BP 17.5. (2023-08-17)
comment
Keywords: Unique Proof Game, Pronkin Theme (d), Pure Round Trip (l)
Genre: Retro
Computer test: Resolution time : 26.37 s., Natch 2.3 Copyright (C) 1997,98,99,2001,2002,2003,2004 Pascal Wassong
FEN: rnbqkbnr/p1p4p/2pp4/1p3Q2/1P1B1p2/2P1PP2/P2P1P1P/RN3NK1
Reprints: 13 64 Proof Games 2012
Input: Gerd Wilts, 2000-08-01
Last update: Gerd Wilts, 2012-12-23 more...
9 - P1000946
Thierry Le Gleuher
v StrateGems 6 04-06/1999
Lob TT
P1000946
(15+15) C+
BP in 25,5
1. Sc3 Sf6 2. Se4 Sd5 3. Sf6 gxf6 4. h4 Lh6 5. Th3 Kf8 6. Tb3 Kg7 7. Tb6 Dg8 8. b4 Kf8 9. Lb2 Dg3 10. Le5 Db3 11. axb3 a6 12. Ta5 Ta7 13. Tab5 a5 14. e3 a4 15. Le2 a3 16. Lh5 a2 17. Dg4 a1=D+ 18. Ke2 Dd4 19. De6 Dg4+ 20. Kd3 Dg8 21. g4 Kg7 22. g5 Dd8 23. g6 Kf8 24. g7+ Ke8 25. g8=S Lf8 26. Sh6
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Pronkin-Thema mit der eingeschlossenen sD. Ein sS könnte a1 nicht mehr verlassen. Ein sT könnte h8 nicht mehr erreichen, und von a8 kann kein sT auf b3 geschlagen werden, da dazu der sBa7 zuerst nach a5 müsste und damit der wTa1 nicht mehr ohne Schlag des sBa nach b5 kann.
paul: Correction of P1000530 (2010-05-05)
Moldenhauer: Computerprüfung: C+ Stelvio 1.0 19:31:47 Stunden.
Keine Lösung: BP 24.5, BP 25.0. (2023-02-15)
comment
Keywords: Unique Proof Game, Phoenix (S), Pronkin Theme (d), Pure Round Trip (k), Tempo Loss (b1)
Genre: Retro
Computer test: Stelvio 1.0
FEN: 1nbqkb1r/rppppp1p/1R2Qp1N/1R1nB2B/1P5P/1P1KP3/2PP1P2/6N1
Reprints: H33 FIDE Album Annexe 1998-2000 2009
Input: Gerd Wilts, 2000-10-15
Last update: Silvio Baier, 2023-03-02 more...
10 - P1001146
Satoshi Hashimoto
(13) Probleemblad 03/1999
P1001146
(14+16) C+
BP in genau 6,5
1. e3 Sf6 2. e4 Sxe4 3. Sa3 Sc3 4. Tb1 Sxb1 5. Sb5 Sa3 6. Sc3 Sc4 7. Sb1
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Mario Richter: brauchen wir wirklich zwei verschiedene Keywords - hier "Tempoverlustmanöver", bei z.B. P1007491 hingegen "Loss of tempo"? (2018-10-21)
Henrik Juel: Good point, Mario
Other things in the never-ending Keyword discussion include:
Tempoverlustmanöver is currently called the same in english and french, and has no definitions
Loss of tempo (Tempoverlust in german) is defined as
'With White to play, a sequence of moves to reach the same position with Black to play. (Help game, abbr .: TV)'
which makes little sense in proof games
In this problem [Pe2] goes e2-e3-e4 ('wasting' a move)
In P1007491 [Pc2] similarly goes c2-c3-c4-... and [Lc8] goes (among other things) c8-b7-a6-c8 ('triangulation') (2018-10-21)
Henrik Juel: There are many solutions in 6.0 moves, like
1.Sb1-c3 Sg8-f6 2.Pe2-e4 Sf6xe4 3.Sc3-a4 Se4-c3 4.Ra1-b1 Sc3xb1 5.Sa4-c3 Sb1-a3 6.Sc3-b1 Sa3-c4
Correction: Change the stipulation to
BP in exactly 6.5 (2024-03-10)
comment
Keywords: Unique Proof Game, Pure Round Trip (S), Homebase (w), Tempo Losing Manouevre (weP)
Genre: Retro
Computer test: (Natch 1.3 Copyright (C) 1997-1999 Pascal Wassong)
FEN: rnbqkb1r/pppppppp/8/8/2n5/8/PPPP1PPP/1NBQKBNR
Reprints: (2) Schweizerische Schachzeitung 05/2005
Input: Gerd Wilts, 2001-02-11
Last update: A.Buchanan, 2024-03-11 more...
11 - P1003973
Michel Caillaud
R55 Problemesis 26 04/2002
2. Preis
P1003973
(16+11) C+
BP in 18,0
1. d4 c5 2. d5 Db6 3. Dd4 Db3 4. axb3 f5 5. Ta6 f4 6. Tc6 f3 7. Sxf3 e5 8. Sxe5 a5 9. Sxd7 a4 10. bxa4 h5 11. b3 h4 12. Lb2 h3 13. Dh4 Sa6 14. f4 Sb4 15. Kf2 Sd3+ 16. Kg1 Se5 17. Sb8 Sd7 18. Sa6 Sb8
play all play one stop play next play all
Rundlauf des sSb8 in 6 Zügen.
Henrik Juel: Natch 3.1 found the solution quickly, but did not finish in more than an hour (2018-12-16)
Moldenhauer: Computerprüfung: C+ Stelvio 1.0 nach nur 1 Sekunde. (2023-02-09)
Henrik Juel: and no solution in 17.5 moves, so C++ Stelvio 1.0 (2023-02-09)
Henrik Juel: Fine motivation for the round trip: making room for white Sd7-b8-a6 (2023-02-09)
comment
Keywords: Unique Proof Game, Pure Round Trip (s)
Genre: Retro
Computer test: Stelvio 1.0
FEN: rnb1kbnr/1p4p1/N1R5/2pP4/P4P1Q/1P5p/1BP1P1PP/1N3BKR
Reprints: feenschach 153 10-12/2003
(H) Quartz 28 07-09/2005
Input: Gerd Wilts, 2002-03-31
Last update: Silvio Baier, 2023-03-02 more...
12 - P1004047
Mark Kirtley
Gianni Donati

R150 Probleemblad 5 09-10/2001
1. Lob
P1004047
(11+15) C+
BP in 25,0
1. h4 f5 2. Th3 f4 3. Tb3 f3 4. Tb6 axb6 5. h5 Ta3 6. h6 Td3 7. a4 gxh6 8. a5 bxa5 9. Ta4 b6 10. Td4 Lb7 11. Td6 exd6 12. e3 Se7 13. De2 Sc8 14. Kd1 Le7 15. De1 0-0 16. Le2 Kh8 17. Df1 fxe2+ 18. Ke1 Tf3 19. Sa3 Th3 20. g3 Lh1 21. Dg2 Dg8 22. Dc6 Db3 23. cxb3 Ld8 24. Dc2 c6 25. Dd1 Lc7
play all play one stop play next play all
7zügiges Tempoverlustmanöver der wD, die kompliziert auf dem Königsflügel freigeschleust werden muss.
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comment
Keywords: Unique Proof Game, Tempo Loss, Pure Round Trip (D), Switchback (K), Castling
Genre: Retro
Computer test: Stelvio 1.0
FEN: 1nn4k/2bp3p/1ppp3p/p7/8/NP1rP1Pr/1P1PpP2/2BQK1Nb
Reprints: Best Problems 47 07/2008
Input: Gerd Wilts, 2002-04-05
Last update: A.Buchanan, 2023-05-14 more...
13 - P1004214
Gianni Donati
R0100c StrateGems 20 10-12/2002
5.-7. Preis ex aequo
P1004214
(11+15) C+
BP in 22,5
1. Sf3 e5 2. Sd4 exd4 3. Sc3 dxc3 4. dxc3 g6 5. Le3 Lh6 6. Lb6 axb6 7. Dd4 Ta5 8. Td1 Lc1 9. Td3 Tg5 10. Tf3 d5 11. Tf6 Lg4 12. Td6 Lxe2 13. Td7 La6 14. Lb5 h5 15. Lc6 Sxc6 16. a4 Db8 17. Te7+ Kd8 18. Te4 h4 19. De5 h3 20. Tb4 Th4 21. Tb3 Sb4 22. Ta3 c6 23. Ta1
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wTa1 wandert nach d7 zum Schachschutz für den wLf1. 12zügier Rundlauf des wTa1.
Moldenhauer: Computerprüfung: C+ Stelvio 1.0 5 Sekunden.
Keine Lösung: BP 21.5, BP 22.0. (2023-02-18)
more ...
comment
Keywords: Unique Proof Game, Pure Round Trip (T), Check Protection
Genre: Retro
Computer test: Stelvio 1.0
FEN: 1q1k2n1/1p3p2/bpp3p1/3pQ1r1/Pn5r/2P4p/1PP2PPP/R1b1K2R
Reprints: feenschach 153 10-12/2003
Input: Gerd Wilts, 2002-10-05
Last update: Silvio Baier, 2023-03-02 more...
14 - P1004461
Ivan Denkovski
Gligor Denkovski

972 Orbit 17 01/2003
1. Lob
P1004461
(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 play one stop play next 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)
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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...
15 - P1011888
Michel Caillaud
Reto Aschwanden

Retros mailing list 31/12/2003
5. Preis
Gianni Donati 50th Jubilee Tourney
P1011888
(15+14) C+
BP in 24,5
1. c4 e5 2. c5 Ld6 3. cxd6 c5 4. Db3 c4 5. Dh3 c3 6. d3 c2 7. Ld2 c1=L 8. b4 Lb2 9. Sa3 Lc3 10. 0-0-0 g5 11. Le1 Ld2+ 12. Kb2 g4 13. Tc1 g3 14. Txc8 gxf2 15. Tc3 Dh4 16. g3 Sf6 17. Lg2 f1=L 18. e3 Le2 19. Sc4 Lf3 20. Se2 Tg8 21. Tf1 Tg6 22. Lh1 Lg2 23. Tf3 Lf1 24. Ka3 Lc1+ 25. Sb2
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Matching squares traced by the promoted Bishops! That this is managed without extra-set pieces is astounding. (PR Gianni Donati)
Cook: 1. c4 e5 2. c5 Ld6 3. cxd6 g5 4. d3 g4 5. e3 g3 6. Dg4 c5 7. Sc3 c4 8. Sa4 c3 9. Ld2 Sh6 10. 0-0-0 c2 11. b4 Tg8 12. Kb2 gxf2 13. g3 Tg6 14. Lg2 f1=L 15. Ka3 c1=L+ 16. Sb2 Le2 17. Le1 Ld2 18. Tc1 Sg8 19. Txc8 Lc1 20. Tc3 Lf3 21. Se2 Dh4 22. Tf1 Sf6 23. Lh1 Lg2 24. Tf3 Lf1 25. Dh3
Henrik Juel: an important keyword is missing: Donati theme
same in (some of) P1011889-P1011929 (2018-12-18)
Henrik Juel: Natch 3.1 found nothing in half an hour (2018-12-18)
Michel Caillaud: Reprint : H71 p.585, FIDE Album 2001-03

Cooked using Jacobi 0.7.5 with constraints :
1.c4 e5 2.c5 Ld6 3.cxd6 g5 4.d3 g4 5.e3 g3 6.Dg4 c5 7.Sc3 c4 8.Sa4 c3 9.Ld2 Sh6 10.0-0-0 c2 11.b4 Tg8 12.Kb2 gxf2 13.g3 Tg6 14.Lg2 f1=L 15.Ka3 c1=L+ 16.Sb2 Le2 17.Le1 Ld2 18.Tc1 Sg8 19.Txc8 Lc1 20.Tc3 Lf3 21.Se2 Dh4 22.Tf1 Sf6 23.Lh1 Lg2 24.Tf3 Lf1 25.Dh3

Correction : sTg6 to g4 (21...Tg4 instead of 21...Tg6 in the solution)
With the set of constraints used to uncork the cook, Jacobi 0.7.5 finds only the intended solution... (2021-09-20)
Michel Caillaud: The correction sTg6 to g4 was published in StrateGems 99 (p.138, sept. 2022)
It is C+ by Stelvio 0.93 (2022-12-18)
comment
Keywords: Unique Proof Game, Round Trip, Pure Round Trip (ll), Obvious promotion (l), Promotion (ll), Donati Theme
Genre: Retro
Computer test: Resolution time: Natch 3.3: ---, Euclide 1.11: ---, Stelvio 1.14: 15:10min
FEN: rn2k3/pp1p1p1p/3P1n2/4p3/1P4rq/K1RPPRPQ/PN2N2P/2b1Bb1B
Input: Gerd Wilts, 2004-01-01
Last update: Silvio Baier, 2023-08-15 more...
16 - P1013119
Rustam Ubaidullajew
4409 Phénix 124 12/2003
P1013119
(16+16) C+
BP in 22,0
1. h4 Sf6 2. Th3 Sd5 3. Tc3 f6 4. Tc5 Kf7 5. c4 Ke6 6. Dc2 Ke5 7. Df5+ Kd4 8. d3 a5 9. Lf4 Ta6 10. Sd2 Te6 11. Ld6 Sb4 12. f4 S4c6 13. Kf2 Se5 14. Kg3 Sf7 15. Kg4 Sh6+ 16. Kh5 Sg8 17. g4 h6 18. Kg6 Ke3 19. h5 Kf2 20. Sh3+ Kg3 21. Sf2 Kh4 22. Sh1 De8+
play all play one stop play next play all
8zügiger Rundlauf des sSg8 zwecks Schachschutz auf d5.
more ...
comment
Keywords: Unique Proof Game, Pure Round Trip (s), Check Protection, Capture-free
Genre: Retro
Computer test: Computerprüfung: C+ Stevio 1.0 34 Sekunden. Keine Lösung: BP 21.0, BP 21.5.
FEN: 1nb1qbnr/1pppp1p1/3BrpKp/p1R2Q1P/2P2PPk/3P4/PP1NP3/R4B1N
Input: Gerd Wilts, 2004-03-13
Last update: A.Buchanan, 2023-03-13 more...
17 - P1017682
Unto Heinonen
Springaren 1997
3. Preis
P1017682
(14+16) cooked
BP in 26,0
1. b4 Sh6 2. Lb2 Tg8 3. Lf6 gxf6 4. Sc3 Tg3 5. Tb1 Th3 6. g4 Sa6 7. Lg2 Tb8 8. Lc6 bxc6 9. g5 Tb5 10. g6 Tbh5 11. b5 Sg4 12. b6 Lh6 13. Tb5 Sb4 14. Tg5 La6 15. b7 Lb5 16. b8=L a6 17. La7 Da8 18. Le3 c5 19. g7 Dg2 20. g8=L Sc6 21. Tg7 Lg5 22. Sf3 h6 23. Lh7 Sb8 24. Le4 f5 25. Lb7 Sf6 26. Sd5 Sg8
play all play one stop play next play all
Cook: 1. Sb1-c3 b7-b6 2. Ta1-b1 Lc8-a6 3. b2-b4 La6-d3 4. b4-b5 Dd8-c8
5. Tb1-b4 Sb8-a6 6. Tb4-c4 Ta8-b8 7. Tc4-c5 b6xc5 8. Lc1-b2 Tb8-b6
9. g2-g4 Tb6-h6 10. b5-b6 Th6-h3 11. b6-b7 Sg8-h6 12. b7-b8=T Th8-g8
13. Tb8-b6 Sa6-b8 14. Lf1-g2 Dc8-a6 15. Tb6-f6 g7xf6 16. Lg2-b7 Tg8-g5
17. Sc3-d5 Tg5-h5 18. g4-g5 Ld3-b5 19. g5-g6 f6-f5 20. g6-g7 Da6-g6
21. Lb2-d4 Dg6-g2 22. g7-g8=T a7-a6 23. Tg8-g3 Sh6-g8 24. Ld4-e3 Lf8-h6
25. Tg3-g7 Lh6-g5 26. Sg1-f3 h7-h6
paul: First 22.5 moves tested with Euclide 1.11 (~11h) (2017-12-29)
Henrik Juel: Now things are OK, I think
Earlier the solution given was for a BP in 19, starting 1.b4 c5 (2017-12-29)
Olaf Jenkner: Yes, I overlooked the date of the first comment. I would not have asked. (2017-12-29)
more ...
comment
Keywords: Unique Proof Game, Pure Round Trip
Genre: Retro
Computer test: Reto: Cooked by Stelvio 1.11
FEN: 1n2k1n1/1BppppR1/p6p/1bpN1pbr/8/4BN1r/P1PPPPqP/3QK2R
Reprints: feenschach 153, p. 191, 10-12/2003
H16 FIDE Album Annexe 1995-1997 2004
Input: Gerd Wilts, 2004-08-06
Last update: Mario Richter, 2023-04-01 more...
18 - P1066801
Rustam Ubaidullajew
R074 Problem Paradise 10-12/2002
3. Preis
P1066801
(14+16) C+
BP in 27,5
1. g4 d5 2. g5 Lg4 3. Lg2 f5 4. Le4 Kf7 5. Ld3 Kg6 6. Lb5 Kh5 7. Le8+ Kh4 8. Lh5 g6 9. Kf1 Lg7 10. Kg2 Le5 11. Df1 Lg3 12. f4 Sf6 13. Df3 Dg8 14. De4 dxe4 15. Sh3 Dc4 16. Tf1 Td8 17. Tf3 Se8 18. Ta3 Td3 19. Sc3 Tf3 20. Sd5 Tf1 21. Sf6 Txc1 22. Sg8 Th1 23. Tf1 Sd7 24. Tff3 Sb6 25. Tfb3 Sc8 26. e3 Ld1 27. Le2 b6 28. Lf1
play all play one stop play next play all
Henrik Juel: Natch 3.1 did hardly anything in almost an hour (2018-12-17)
Henrik Juel: Same after 4 hours (2018-12-17)
Moldenhauer: Computerprüfung: C+ Stelvio 1.11 120:10:08 Stunden. (hhh:mm:ss)
Keine Lösung: BP 26.5, BP 27.0. (2023-04-06)
Henrik Juel: Thanks, Moldenhauer
Your computer is very patient...
120 hours = 5 days! (2023-04-06)
comment
Keywords: Unique Proof Game, Pure Round Trip (L)
Genre: Retro
Computer test: Stelvio 1.2, 7:40h. The reduction in time is due to the fact that I had a lot of RAM at hand, which is very useful for this problem. There are only 8 strategies, but they take long to play.
FEN: r1n1n1N1/p1p1p2p/1p4p1/5pP1/2q1pP1k/RR2P1bN/PPPP2KP/3b1B1r
Reprints: feenschach 153 10-12/2003
Input: Gerd Wilts, 2004-10-17
Last update: Reto, 2023-05-13 more...
19 - P1066806
Roberto Osorio
R077 Problem Paradise 10-12/2003
3. ehrende Erwähnung
P1066806
(9+15) C+
BP in 23,5
1. g3 Sc6 2. Lg2 Sd4 3. Lc6 dxc6 4. Kf1 Lf5 5. Kg2 Lg6 6. Df1 Sf5 7. Kf3 Kd7 8. Ke4 Kd6 9. Kd3 Kc5+ 10. Kc3 Dd5 11. Dh3 Dxa2 12. Dxh7 Dxb1 13. Dh4 Dxc1 14. Da4 Txh2 15. Sh3 Dxh1 16. Tg1 a5 17. Da1 Kb5 18. Kb3 a4+ 19. Ka2 a3 20. Kb1 a2+ 21. Kc1 Ta3 22. Kd1 Txg3 23. Ke1 Tgg2 24. Dd1
play all play one stop play next play all
more ...
comment
Keywords: Unique Proof Game, Pure Round Trip (KD)
Genre: Retro
Computer test: Computerprüfung: C+ Stelvio 1.4 in 10:29:19 Stunden. (hh:mm:ss) Keine Lösung: BP 23.0. Stelviodaten: 2 Seeker/16 Player 108 GB.
FEN: 5bn1/1pp1ppp1/2p3b1/1k3n2/8/7N/pPPPPPrr/3QK1Rq
Input: Gerd Wilts, 2004-10-17
Last update: A.Buchanan, 2023-07-28 more...
20 - P1067420
Michel Caillaud
StrateGems 2001
1. Preis
P1067420
(12+16) C+
BP in 22,5
1. c4 h5 2. c5 Th6 3. c6 Txc6 4. a4 Txc1 5. Ta3 c5 6. Tc3 Da5 7. Sa3 Ta1 8. Tc1 Dc3 9. f4 a5 10. f5 Ta6 11. f6 Txf6 12. Sh3 b6 13. Sf4 La6 14. Kf2 Ld3 15. Ke3 Ta2 16. Sd5 Txf1 17. h4 f5 18. Th3 Th1 19. Tf3 Th2 20. Tf1 f4+ 21. Kf2 f3 22. Ta1 Lb1 23. Th1
play all play one stop play next play all
Rundlauf der beiden wTT.
Henrik Juel: Natch 3.1 made no progress after an hour (2018-12-15)
Moldenhauer: Computerprüfung: C+ Stelvio 1.0 3 Sekunden.
Keine Lösung: BP 21.5, BP 22.0. (2023-02-18)
comment
Keywords: Unique Proof Game, Pure Round Trip (TT)
Genre: Retro
Computer test: Stelvio 1.0
FEN: 1n2kbn1/3pp1p1/1p6/p1pN3p/P6P/N1q2p2/rP1PPKPr/Rb1Q3R
Reprints: feenschach 153, p. 201, 10-12/2003
Input: Gerd Wilts, 2005-01-09
Last update: Silvio Baier, 2023-03-02 more...
21 - P1067433
Rustam Ubaidullajew
The Ural's Problemist 2003
3. Preis
P1067433
(16+15) C+
BP in 20,5
1. d3 c6 2. Ld2 Db6 3. La5 Db3 4. axb3 Sf6 5. Ta4 Sd5 6. Th4 Sb6 7. e4 Kd8 8. Ke2 Kc7 9. Kf3 Kd6 10. Kg3 Ke5 11. Dh5+ Ke6 12. Le2 Kd6 13. Dd5+ Kc7 14. Lh5 Kd8 15. Sf3 Ke8 16. Te1 Sc4 17. Te3 Se5 18. Se1 Sg4 19. Tf3 Sh6 20. Tf6 Sg8 21. f3
play all play one stop play next play all
Rundläufe von sK und sSg8, um ein Tempo zu verlieren.
more ...
comment
Keywords: Unique Proof Game, Pure Round Trip (sk), Tempo Loss (k9)
Genre: Retro
Computer test: Computerprüfung: C+ Stelvio 1.0 00:46:34 Minuten (hh:mm:ss). Keine Lösung: BP 19.5, BP 20.0.
FEN: rnb1kbnr/pp1ppppp/2p2R2/B2Q3B/4P2R/1P1P1PK1/1PP3PP/1N2N3
Reprints: feenschach 153 10-12/2003
Input: Gerd Wilts, 2005-01-09
Last update: A.Buchanan, 2023-03-02 more...
22 - P1068194
Gianni Donati
9926 Thema Danicum 121 01/2006
P1068194
(12+16) C+
BP in 24,0
1. d3 h5 2. Lf4 Sh6 3. Ld6 exd6 4. Sc3 Dg5 5. Db1 Dc1+ 6. Sd1 g5 7. a3 Lg7 8. Da2 Lxb2 9. Dc4 f6 10. Dg4 Kf7 11. Sf3 Te8 12. Sd2 Te3 13. Sb1 Th3 14. e3 Kg6 15. Le2 Sf7 16. Lf3 Sh8 17. Lc6 dxc6 18. 0-0 c5 19. Sdc3 Sc6 20. Dd1 Lg4 21. Kh1 Le2 22. f3 Lxf1 23. Se2 g4 24. Sg1 Kg5
play all play one stop play next play all
5zügiger Rundlauf der wD und Platzwechsel der wSS.
Reto: A lot faster with Stelvio 1.25, finished in about 1min. (2023-05-29)
more ...
comment
Keywords: Unique Proof Game, Interchange (SS), Pure Round Trip (D5), Impostor (SS)
Genre: Retro
Computer test: Computerprüfung: C+ Stelvio 1.11 01:03:51 Stunde. (hh:mm:ss) Keine Lösung: BP 23.0, BP 23.5.
FEN: r6n/ppp5/2np1p2/2p3kp/6p1/P2PPP1r/1bP3PP/RNqQ1bNK
Input: Gerd Wilts, 2005-12-21
Last update: A.Buchanan, 2023-04-27 more...
23 - P1068378
Gianni Donati
The Problemist Supplement 2001-2002
1. Preis, TT3
P1068378
(15+13) C+
BP in 20,0
1. e3 Sf6 2. Lb5 Sd5 3. Lc6 dxc6 4. Ke2 Dd6 5. Kd3 Dg3 6. hxg3 h6 7. Txh6 f5 8. Tf6 Th4 9. Se2 Tc4 10. Dh1 Tc3+ 11. bxc3 Sb6 12. La3 Sc4 13. Ld6 Sa5 14. Sa3 Sb3 15. Tb1 Sd4 16. Tb4 Se6 17. Tg4 Sd8 18. Tgg6 Sf7 19. g4 Sh6 20. Sg3 Sg8
play all play one stop play next play all
12-zügiger Rundlauf des sSg8, der früh nach d5 spielen muß, um Schachschutz zu geben.
Moldenhauer: Computerprüfung: C+ Stelvio 1.0 01:13:11 Stunde.
Keine Lösung: BP 19.0, BP 19.5. (2023-03-01)
comment
Keywords: Unique Proof Game, Pure Round Trip (s12), Check Protection
Genre: Retro
Computer test: Stelvio 1.0
FEN: rnb1kbn1/ppp1p1p1/2pB1RR1/5p2/6P1/N1PKP1N1/P1PP1PP1/7Q
Reprints: (B) Quartz 28 07-09/2005
Input: Gerd Wilts, 2006-03-12
Last update: Silvio Baier, 2023-03-02 more...
24 - P1068380
Michel Caillaud
The Problemist Supplement 2001-2002
4. ehrende Erwähnung, TT3
P1068380
(15+13) C+
BP in 21,0
1. e4 a5 2. Ke2 Ta6 3. Kf3 Tc6 4. Kg4 Tc3 5. dxc3 Sc6 6. Le3 Sa7 7. Lc5 Sb5 8. Dd4 Sd6 9. Sd2 Sf5 10. Te1 d6 11. Te3 Le6 12. Th3 Lb3 13. Th6 gxh6 14. cxb3 Lg7 15. b4 Le5 16. Sb3 Lg3 17. hxg3 Sg7 18. Th5 Se6 19. Kh3 Sf8 20. Kh2 Sd7 21. Kh1 Sb8
play all play one stop play next play all
10-zügiger Rundlauf des sSb8 zwecks Schachschutz auf f5
Henrik Juel: Natch 3.1 produced little in an hour (2018-12-16)
Moldenhauer: Computerprüfung: C+ Stelvio 1.11 00:34:52 Minuten. (hh:mm:ss)
Keine Lösung: BP 20.0, BP 20.5. Histogramm 44/0k. (2023-03-16)
comment
Keywords: Unique Proof Game, Pure Round Trip (s10), Check Protection
Genre: Retro
Computer test: Stelvio 1.11
FEN: 1n1qk1nr/1pp1pp1p/3p3p/p1B4R/1P1QP3/1NP3P1/PP3PP1/5BNK
Reprints: (D) Quartz 28 07-09/2005
Input: Gerd Wilts, 2006-03-12
Last update: Silvio Baier, 2023-03-20 more...
25 - P1068539
Eric Pichouron
5008 Phénix 146 12/2005
P1068539
(13+12) cooked
BP in 23,0
1. a3 e5 2. Ta2 Lb4 3. axb4 h5 4. Ta3 h4 5. Tg3 hxg3 6. hxg3 f5 7. Th3 f4 8. gxf4 a5 9. Ta3 Th1 10. Sf3 Txf1+ 11. Kxf1 Ta6 12. Kg1 Tg6 13. Kh2 d6 14. Dh1 Lg4 15. Kg3 Sf6 16. Dh7 Th6 17. Ta1 Th1 18. Sa3 Txc1 19. Kh4 Th1+ 20. Kg5 Th3 21. Th1 Tg3 22. Dh3 e4 23. Sh4 Lc8+
play all play one stop play next play all
Cook: 1. Sa3 a5 2. Sb5 e5 3. a3 Lb4 4. axb4 h5 5. Ta3 h4 6. Tg3 hxg3 7. hxg3 Ta6 8. Th7 Th6 9. Sf3 Th1 10. Th2 Txf1+ 11. Kxf1 Th3 12. Kg1 e4 13. Th1 f5 14. Sh4 f4 15. gxf4 Ta3 16. Kh2 Ta1 17. Kg3 Txc1 18. Kg4 Ta1 19. Dg1 Ta3 20. Dh2 Tb3 21. Sa3 Sf6+ 22. Kg5 d6 23. Dh3 Tg3+
Henrik Juel: Natch 3.1 did not find the solution in half an hour
Stopped at pos. 4961 (2018-12-22)
Moldenhauer: Computerprüfung: Cooked Stelvio 1.11 14:12:45 Stunden. (hh:mm:ss)
Keine Lösung: BP22.0, BP 22.5.
Beispiel: 1.Sa3 a5 2.Sb5 e5 3.a3 Lb4 4.axb4 h5 5.Ta3 h4 6.Tg3 hxg3 7.hxg3 Ta6
8.Th7 Th6 9.Sf3 Th1 10.Th2 Txf1+ 11.Kxf1 Th3 12.Kg1 e4 13.Th1 f5
14.Sh4 f4 15.gxf4 Ta3 16.Kh2 Ta1 17.Kg3 Txc1 18.Kg4 Ta1 19.Dg1 Ta3
20.Dh2 Tb3 21.Sa3 Sf6+ 22.Kg5 d6 23.Dh3 Tg3+ (2023-03-28)
more ...
comment
Keywords: Unique Proof Game, Pure Round Trip (T)
Genre: Retro
FEN: 1nbqk3/1pp3p1/3p1n2/p5K1/1P2pP1N/N5rQ/1PPPPPP1/7R
Input: Gerd Wilts, 2006-08-14
Last update: Silvio Baier, 2023-04-05 more...
26 - P1106668
Gianni Donati
Olli Heimo
Joose Norri

P0267 StrateGems 50 04-06/2010
3. Preis
P1106668
(13+13) C+
BP in 23,0
1. a4 a5 2. Ta3 Ta6 3. Tf3 Tg6 4. Tf6 gxf6 5. b4 Lh6 6. b5 Le3 7. f4 La7 8. b6 Sa6 9. bxa7 b6 10. Kf2 Lb7 11. Ke3 Lf3 12. gxf3 Da8 13. Lh3 De4+ 14. fxe4 Sh6 15. Sf3 Tgg8 16. Dg1 Tf8 17. Dg4 Sg8 18. De6 fxe6 19. Tg1 Kf7 20. Tg5 Ta8 21. Td5 exd5 22. Le6+ Ke8 23. f5 Sb8
play all play one stop play next play all
Henrik Juel: Natch 3.1 did not find the solution in half an hour
Stopped at pos. 12 (2018-12-29)
more ...
comment
Keywords: Unique Proof Game, Pure Round Trip (t), Switchback (kss)
Genre: Retro
Computer test: Stelvio 1.11
FEN: rn2k1nr/P1ppp2p/1p2Bp2/p2p1P2/P3P3/4KN2/2PPP2P/1NB5
Input: Gerd Wilts, 2010-06-03
Last update: A.Buchanan, 2023-07-26 more...
27 - P1177782
Roberto Osorio
Jorge Joaquin Lois

14636 Die Schwalbe 245 10/2010
P1177782
(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 play one stop play next 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...
28 - P1232272
Mark Kirtley
Retros mailing list 31/12/2003
4. Preis (version)
Gianni Donati 50th Jubilee Tourney
P1232272
(14+12) C+
BP in 23,5
1. a4 h5 2. a5 Th6 3. a6 Tc6 4. axb7 a5 5. bxc8=L a4 6. La6 Dc8 7. Lc4 Da6 8. Le6 Dd3 9. exd3 a3 10. Df3 a2 11. Df6 exf6 12. f4 Ld6 13. f5 Lxh2 14. Kd1 Le5 15. Th4 d6 16. Tb4 h4 17. Lc8 h3 18. Txb8 h2 19. Tb5 h1=T 20. Le6 Th2 21. Lc4 0-0-0 22. Td5 Kb7 23. La6+ Kb6 24. Lc8
play all play one stop play next play all
Cook: 1. a2-a4 a7-a5 2. f2-f4 b7-b5 3. Ke1-f2 h7-h5 4. Kf2-e3 Th8-h6 5. Dd1-e1 Th6-c6 6. a4xb5 a5-a4 7. De1-h4 a4-a3 8. Dh4-f6 e7xf6 9. Ke3-f2 Lf8-d6 10. b5-b6 Ld6-e5 11. b6-b7 d7-d6 12. b7xc8=L Dd8-d7 13. h2-h3 Dd7xh3 14. f4-f5 Dh3-d3 15. Th1-h4 a3-a2 16. Th4-b4 h5-h4 17. Tb4xb8 h4-h3 18. Tb8-b5 h3-h2 19. Tb5-d5 h2-h1=T 20. Lc8-a6 Th1-h2 21. La6-b5 0-0-0 22. e2xd3 Kc8-b7 23. Lb5-a6+ Kb7-b6 24. La6-c8 (Stelvio v0.93, RA)
The promoted white Bishop leaves its promotion square by a counterclockwise route. No sooner has it returned than it leaves again and retraces its steps, clockwise now! (PR Gianni Donati)

Correction of P1011887
Michel Caillaud: The correction found in the Winchloé database is with 14.Kd1 instead of 14.Kf2 and is C+ (Natch, Stelvio...) (2022-12-18)
comment
Keywords: Unique Proof Game, Round Trip, Pure Round Trip (L)
Genre: Retro
Computer test: Stelvio 1.0
FEN: 2Br2n1/2p2pp1/1krp1p2/3RbP2/8/3P4/pPPP2Pr/RNBK1BN1
Input: Dan Meinking, 2012-02-15
Last update: Silvio Baier, 2023-03-02 more...
29 - P1240724
Thierry Le Gleuher
2456 Orbit 40 10/2008
P1240724
(11+15) C+
BP in 23,5
1. a4 b5 2. axb5 c6 3. Ta6 Da5 4. h4 Da1 5. Sa3 Dxc1 6. Sh3 Da1 7. Db1 Dxa3 8. Da2 Dxh3 9. De6 Dxh1 10. Dh6 e6 11. Kd1 Se7 12. Kc1 Sg6 13. Kb1 Dxf1+ 14. Ka2 Da1+ 15. Kb3 Da4+ 16. Kc3 La3 17. Kd3 d6 18. Ke3 Sd7 19. Kf3 Sf8 20. Kg3 Ld7 21. Kh2 0-0-0 22. Kg1 Te8 23. Kf1 Te7 24. Ke1
play all play one stop play next play all
Henrik Juel: Natch 3.1 did not find the solution in half an hour
Stopped at pos. 349 (2018-12-27)
more ...
comment
Keywords: Unique Proof Game, Pure Round Trip (K)
Genre: Retro
Computer test: Computerprüfung: C+ Stelvio 1.11 168:37:47 Stunden. (hhh:mm:ss) Keine Lösung: BP 22.5, BP 23.0 in ca. 73 Stunden.
FEN: 2k2n1r/p2brppp/R1ppp1nQ/1P6/q6P/b7/1PPPPPP1/4K3
Input: Gerd Wilts, 2012-06-04
Last update: A.Buchanan, 2023-04-15 more...
30 - P1257184
Satoshi Hashimoto
v StrateGems 1998
P1257184
(14+15) C+
BP in 16,5
1. h4 a5 2. Th3 a4 3. Tb3 axb3 4. axb3 e5 5. Ta6 Lc5 6. Tf6 Ta1 7. Sc3 Txc1 8. g3 Ta1 9. Lh3 Ta8 10. Da1 d6 11. Kd1 Sd7 12. Kc1 Tb8 13. Da8 La7 14. Sa2 b6 15. Dh1 Ta8 16. Sf3 Sb8 17. Dd1
play all play one stop play next play all
Henrik Juel: Beautiful roundtrip by Dd1.
C? by Euclide, meaning that I stopped after a couple of hours without progress (2012-12-23)
Henrik Juel: Natch 3.1 was no better (2018-12-13)
Moldenhauer: Computerprüfung: C+ Euclide 1.11 in 41 Min. 35 Sek. nur 1 Lösung!
Keine Lösung bei BP in 15.5. Nach 10 Jahren doch gelöst mit Euclide. (2023-01-19)
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comment
Keywords: Unique Proof Game, Pure Round Trip (D)
Genre: Retro
Computer test: Stelvio 1.17, 35sec
FEN: rnbqk1nr/b1p2ppp/1p1p1R2/4p3/7P/1P3NPB/NPPPPP2/2KQ4
Reprints: 5 64 Proof Games 2012
Input: Gerd Wilts, 2012-12-23
Last update: Reto, 2023-04-17 more...
31 - P1288890
Gianni Donati
P0333 StrateGems 2012
3. Preis
P1288890
(13+14) C+
BP in 22.0
1. f3 h5 2. Kf2 Th6 3. Kg3 h4+ 4. Kg4 h3 5. Sxh3 Te6 6. Sf2 d5 7. h4 d4 8. h5 d3 9. h6 dxc2 10. Th5 Dd3 11. Tb5 Dc3 12. dxc3 a6 13. Lg5 axb5 14. Lf6 exf6 15. e3 Ld6 16. Lc4 Kd7 17. Dd3 Te8 18. Sd2 Se7 19. Th1 Th8 20. Th5 Sg8 21. Tc5 Ke8+ 22. Df5 Lf8
play all play one stop play next play all
PR R.MacCracken: A well-concealed bR Rundlauf for screening with K/B/S switchbacks to let it come back home. The final position is appealing to a solver - Black looks like he has hardly moved, and yet it is not an obvious promotion-themed problem.
Henrik Juel: Natch 3.1 did little in half an hour
Stopped at pos. 1 (2018-12-30)
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comment
Keywords: Unique Proof Game, Pure Round Trip (t), Switchback (kls)
Genre: Retro
Computer test: Computerprüfung: C+ Stelvio 1.0 00:04:01 Minuten. (hh:mm:ss) Keine Lösung: BP 21.0, BP 21.5.
FEN: rnb1kbnr/1pp2pp1/5p1P/1pR2Q2/2B3K1/2P1PP2/PPpN1NP1/8
Input: Mario Richter, 2014-10-08
Last update: A.Buchanan, 2023-03-10 more...
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The problems of this query have been registered by the following contributors:

Gerd Wilts (29)
Dan Meinking (1)
Mario Richter (1)