Die Schwalbe

38 problem(s) found in 3859 milliseconds (displaying 38 problem(s)). [COMMENTDATE>=20200919 AND NOT K='Hilfsrückzüger' AND K='Eindeutige Beweispartie']

1 - P0002312
Kostas Prentos
5673 feenschach 93 11-12/1989
P0002312
(14+11) cooked
BP in 17,5
1. e3 b5 2. Ld3 b4 3. Lg6 b3 4. axb3 hxg6 5. Ta5 Th3 6. Tb5 Tg3 7. hxg3 a5 8. Th8 a4 9. Dh5 a3 10. Se2 Ta4 11. bxa4 gxh5 12. b3 g6 13. Lb2 Lh6 14. Lg7 Lg5 15. Lh6 Lh4 16. gxh4 a2 17. Sg3 a1=T 18. Txg8#
play all play one stop play next play all
Cook: 1. h4 b6 2. Th3 La6 3. Ta3 h5 4. e3 Lxf1 5. Se2 a6 6. Sg3 Le2 7. Txa6 b5 8. Th6 Ta3 9. Txh8 Tc3 10. a4 Lxd1 11. Ta3 Lf3 12. Tb3 Lb7 13. Txb5 Ta3 14. b3 g6 15. Lb2 Lg7 16. Lxg7 Ta1 17. Lh6 Lc8 18. Txg8#
s. Version P0007474
HHS: "Die Auflösung erscheint zunächst nicht übermäßig schwierig - die TTT schlängeln sich durch die BB hindurch, dabei geht geht der Tg8 über a6, um einen der sB dort wiedererstehen zu lassen. Im 'Gegenzug' vollbringt der Lc8 ein Husarenstück - Dd1 und Lf1 gehen auf sein Konto - aber es funktioniert nicht: Der L kommt nicht über b5 hinweg, denn weder der wT noch der sB (der dort entsteht) haben Zeit, ihm Platz zu machen. Also muß man sich was anderes ausdenken: Die sBB kann man zu einem Überkreuzschlagen der wBBa- und b- ausnutzen: Das erleichtert die Rückführung der linken Türme. Aber das genügt noch nicht: Jetzt braucht Schwarz zuviel Züge. Man muß den Gedanken an den L-Streich aufgeben. Dann können die wFiguren ein analoges Spiel der sB oben rechts ermöglichen. Schwarz schafft die Zugzahl spielend, aber Weiß braucht genau 18 Züge, und das auch nur dann, wenn Tg8 direkt nach g3 kann. Aber was sollte dann der erste wRückzug sein? Bis jetzt hat man die sFiguren problemlos einfach in der NO-Ecke wiedererstehen lassen - man muß auch da einen komplizierteren Modus wählen und darf den wBh- nicht einfach zurückgehen lassen, sondern man muß ihm die Möglichkeit geben, ebenso wie sein sGegenüber den wT auf der h-Linie durchzulassen. Das ist kompliziert und knifflig, aber so und nur so klappt es [dies Wort in Gottes Ohr! HG]. Bestechend ist der Einbau der Verführungen, die immer nur um Haaresbreite scheitern." "Gefällt mir!" (WD als Prüfer) Diese ausgekochten und tollen Kreuzschlagmanöver fand aber leider nur HHS, da es doch eine NL gibt.
Henrik Juel: The content is concealed pawn captures
Despite no visible captures White captured a2xPb3xTa4 to open the a-line for [Ta1,Pa7], and h2xTg3xLh4 with black h7xLg6xDh5 to open the h-line for [Th1,Th8]
This makes life difficult for the human solver and for Natch 3.1, who tested the first 15.0 moves correct in 40 sec.
Testing the entire proof game would need more than a couple of hours by Natch (2018-12-08)
paul: See P0007474 as a version. (2020-11-03)
comment
Keywords: Unique Proof Game, Promotion (t)
Genre: Retro
FEN: 1nbqk1R1/2pppp2/6pB/1R5p/P6P/1P2P1N1/2PP1PP1/rN2K3
Reprints: 143 Shortest Proof Games 11/1991
Input: Gerd Wilts, 1995-06-03
Last update: Mario Richter, 2020-11-04 more...
2 - P0005327
Valerian Onitiu
8397 The Fairy Chess Review 9 28/11/1949
P0005327
(14+16)
BP in 19,0
Die PAS wurde verändert, indem die Position der schwarzen und weißen Steine geändert wurde (Free Chess).
PAS: ssltktdl, LDTKTLSS (nnbrkrqb/pppppppp/8/8/8/8/PPPPPPPP/BQRKRBNN)
1. b3 0-0-0 (Kf8, Te8) 2. Lf6 gxf6 3. Sg3 Lg7 4. Se4 Lh6 5. Sc5 Le3 6. Sa6 Lb6 7. e3 Dg3 8. Lc4 Dd6 9. Le6 fxe6 10. Sf3 Kf7 11. 0-0 (Kg1,Tef1) Tg8 12. Tce1 Tg3 13. Dd1 Th3 14. g4 Tg8 15. Kg2 Tg5 16. Th1 Tb5 17. Sg5 Kg7 18. Df3 La5 19. Te2 Tb6
play all play one stop play next play all
Originalforderung: "In No. 8397 pieces began game on normal ranks, but not in normal array. The two arrays were however similar, e.g., similar pieces were on c1 and f8. Black has just played his 19th move. What was the game?"
Mario Richter: I do not understand, why 1. ... (Kf8, Te8) is noticed as "0-0-0" (does "Free Chess" have a "Free Castling Rule"?) (2020-09-20)
comment
Keywords: Unique Proof Game, Castling
Genre: Retro
FEN: nnb5/ppppp2p/Nr1qppk1/b5N1/6P1/1P2PQ1r/P1PPRPKP/7R
Input: Gerd Wilts, 1995-06-03
Last update: Mario Richter, 2020-09-20 more...
3 - P1000957
Thierry Le Gleuher
10c Messigny 2000
P1000957
(15+14)
BP in 20,5
1. h4 e6 2. Th3 Ld6 3. Te3 Lg3 4. Te5 d6 5. e4 Ld7 6. Lc4 Lb5 7. Ld5 Lf1 8. d3 h6 9. Lg5 hxg5 10. c4 Th6 11. Sc3 Tf6 12. Db1 Tf3 13. Kd1 Te3 14. f4 Te2 15. f5 Tc2 16. Sce2 Tc3 17. f6 Tb3 18. axb3 c5 19. Ta6 Da5 20. b4 Kd8 21. bxa5
play all play one stop play next play all
Lange Wanderung des sTh8 nach b3. Der wBa muss überkreuz geschlagen haben, damit Weiß den wTa1 schnell genug nach a6 spielen kann.
Michel Caillaud: cooked testing the last moves with Jacobi 0.7.5 and constraints for wBa cross-capture
(constraints Pa2-a3xb4xa5 or Pa2xb3-b4xa5 or Pa2xb3xa4-a5) :
9…c5 10.Cc3 Dd7 11.Cce2 Cf6 12.Db1 Re7 13.Rd1 Tc8 14.c4 Tc6 15.f4 Tb6 16.f5 Tb3 17.axb3 hxg5 18.Ta6 Da4 19.bxa4 Rd8 20.a5 Cg8 21.f6 (2020-10-17)
comment
Keywords: Unique Proof Game, Promenade
Genre: Retro
FEN: rn1k2n1/pp3pp1/R2ppP2/P1pBR1p1/2P1P2P/3P2b1/1P2N1P1/1Q1K1bN1
Input: Gerd Wilts, 2000-10-15
Last update: Gerd Wilts, 2005-12-30 more...
4 - P1004002
Noam D. Elkies
R0094 StrateGems 17 01-03/2002
Richard Stanley gewidmet
P1004002
(14+15) C+
BP in 23,5
1. Sc3 d5 2. Sxd5 h6 3. Se3 Dd3 4. Tb1 Dh7 5. Sf5 a5 6. e3 a4 7. Dh5 a3 8. Ke2 axb2 9. a4 Ta6 10. a5 Tg6 11. a6 c5 12. a7 c4 13. a8=T c3 14. Ta6 cxd2 15. Tb6 d1=T 16. Ld2 Sf6 17. La5 Td8 18. c3 Sd7 19. Kd3 Dg8 20. Kd4 Th7 21. Lb5 Dh8 22. La4 Sg8 23. Kd5 f6 24. Ke6= patt
play all play one stop play next play all
James Malcom: Is this the record for the longest PG ending in stalemate? (2020-11-13)
A.Buchanan: There are no shorter ones in PDB without a promotion ("=" can mean promotion or draw). Coming at 41.5 by Guus Rol there is P1011937, ending in draw by 3Rep. (2020-11-13)
more ...
comment
Keywords: Unique Proof Game, Non-standard material (Tt)
Genre: Retro
Computer test: Natch 3.1 (15 min.)
FEN: 2brkbnq/1p1np1pr/1R2Kprp/B4N1Q/B7/2P1P3/1p3PPP/1R4NR
Input: Gerd Wilts, 2002-04-05
Last update: A.Buchanan, 2020-11-13 more...
5 - P1009495
Peter Rösler
B4 Problemkiste 148 08/2003
P1009495
(15+16) C+
BP in 5,0
Stafettenschach
1. e4 e5 2. Ke2 Dh4 3. De1 Dxe4+ 4. Kd1 Dh4 5. d4 Dd8
play all play one stop play next play all
Henrik Juel: Without the condition the solution also works, but there are many cooks (2020-11-01)
more ...
comment
Keywords: Unique Proof Game, Relay Chess, Interchange (KD)
Genre: Retro, Fairies
Computer test: paul: Checked by Jacobi (with relay condition) (2020-10-31)
FEN: rnbqkbnr/pppp1ppp/8/4p3/3P4/8/PPP2PPP/RNBKQBNR
Input: Gerd Wilts, 2003-08-15
Last update: Erich Bartel, 2020-11-01 more...
6 - P1017461
Kostas Prentos
Andriy Frolkin

Messigny 05/2004
1. ehrende Erwähnung Retro-Kompositionsturnier
P1017461
(13+15) C+
BP in 21,5
1. a4 h5 2. a5 h4 3. a6 h3 4. axb7 hxg2 5. Ta6 Th3 6. Tf6 Ta3 7. h4 c5 8. Th3 c4 9. Td3 cxd3 10. c4 gxf6 11. c5 Lh6 12. c6 Le3 13. c7 Sc6 14. b8=T Sh6 15. Tb4 Tb8 16. Tc4 Tbb3 17. Sc3 Lb6 18. e3 Lb7 19. Sge2 Da8 20. c8=T Ld8 21. Tb8 Sd4 22. Tcc8
play all play one stop play next play all
paul: 16.Tc4 T8b3 (2020-11-03)
A.Buchanan: A nice trick for the parser which builds the animation would be to spot when a move is ambiguous. So here 16. ... Tb3 needed to be fixed to be 16. ... Tbb3. In this case, the animation guessed wrong and later reported that 19. ... Da8 was impossible. However in some cases, the error might not be picked up by a later illegal move, yet it could still be important. I will request that Gerd have a look at fixing this ancient issue. (2020-11-04)
A.Buchanan: 22.Tc8 was also imprecise, but did not cause a later illegality so there was no clue. Comparing the diagram at the end of animation to the start diagram would not necessarily be sufficient even for proof games, and completely inadequate for forward stipulations. It’s the parser can best nail these issues on a per-move basis. I’ve emailed Gerd (2020-11-05)
A.Buchanan: Gerd has fixed this: announcement 2020-11-7: The solution engine now no longer plays moves with ambiguous move notation in order to ensure that unambiguous solutions are added.
Thanks so much, Gerd! (2020-11-08)
comment
Keywords: Unique Proof Game, Interchange (TT), Phoenix (TT)
Genre: Retro
Computer test: Natch 2.2 Copyright (C) 1997,98,99,2001,2002,2003 Pascal Wassong
FEN: qRRbk3/pb1ppp2/5p1n/8/3n3P/rrNpP3/1P1PNPp1/2BQKB2
Input: Gerd Wilts, 2004-06-03
Last update: Gerd Wilts, 2020-11-07 more...
7 - P1017464
Andriy Frolkin
Kostas Prentos

Messigny 05/2004
4. ehrende Erwähnung Retro-Kompositionsturnier
P1017464
(13+13) C+
BP in 14,5
1. a4 d5 2. Ta3 d4 3. Tf3 d3 4. g4 dxe2 5. d3 exf1=S 6. Se2 c5 7. Sg3 c4 8. Ke2 c3 9. Dxf1 cxb2 10. c4 e6 11. Sc3 b1=S 12. Dh3 Sd2 13. Te1 Sf1 14. Kxf1 e5 15. Txe5
play all play one stop play next play all
paul: The first S Ceriani-Frolkin is a Schnoebelen. (2020-11-03)
comment
Keywords: Ceriani-Frolkin Theme (ss), Unique Proof Game, Homebase (s)
Genre: Retro
Computer test: Natch 2.2 Copyright (C) 1997,98,99,2001,2002,2003 Pascal Wassong
FEN: rnbqkbnr/pp3ppp/8/4R3/P1P3P1/2NP1RNQ/5P1P/2B2K2
Input: Gerd Wilts, 2004-06-03
Last update: A.Buchanan, 2013-01-23 more...
8 - P1067873
Roberto Osorio
Jorge Joaquin Lois

StrateGems 2004
5. Preis
P1067873
(15+13) C+
BP in 22,5
1. b3 g6 2. La3 Lg7 3. Ld6 Lc3 4. Lxc7 Sf6 5. Lxb8 Da5 6. h4 Da3 7. Lh2 a5 8. g3 Ta6 9. Lg2 Te6 10. Kf1 Te3 11. dxe3 d6 12. Dd3 Kd7 13. Da6 bxa6 14. La8 Lb7 15. Sf3 Tc8 16. Lg1 Tc4 17. Sh2 Tg4 18. f4 Kc6 19. Lf2 Kc5 20. Le1 Lf3 21. Ld2 Se4 22. Lc1 Sd2+ 23. Kg1
play all play one stop play next play all
paul: wBc1 circuit (2020-11-29)
more ...
comment
Keywords: Unique Proof Game
Genre: Retro
Computer test: Natch 3.1 (3 min.)
FEN: B7/4pp1p/p2p2p1/p1k5/5PrP/qPb1PbP1/P1PnP2N/RNB3KR
Reprints: feenschach 155, p. 296, Herb/2004
Input: Gerd Wilts, 2005-05-14
Last update: Alfred Pfeiffer, 2018-12-21 more...
9 - P1068639
Roberto Osorio
Jorge Joaquin Lois

1961 Orbit 32 10/2006
Nicolas Dupont gewidmet
3rd Prize
P1068639
(15+13)
BP in 20,0
1. Sc3 Sc6 2. Sd5 Tb8 3. Sxe7 Kxe7 4. a4 Kf6 5. a5 Kg6 6. a6 Dh4 7. axb7 Sf6 8. bxc8=S Tb3 9. h3 Lb4 10. Sd6 Te8 11. Sf5 Tee3 12. Sg3 Se5 13. f4 Tf3 14. e4 Tf2 15. S1e2 Tbf3 16. Sc3 c6 17. d3 Td2 18. Sb1 Tff2 19. Se2 Kh5 20. Sg1+ Tfe2#
play all play one stop play next play all
Henrik Juel: Sb1 is actually [Sg1], and Sg1 is [Pa2] promoted on c8.
Testing with Euclide ran out of time. (2011-02-27)
paul: The first 19 moves checked by Euclide in half a day. (2020-12-02)
more ...
comment
Keywords: Unique Proof Game, Interchange
Genre: Retro
FEN: 8/p2p1ppp/2p2n2/4n2k/1b2PP1q/3P3P/1PPrr1P1/RNBQKBNR
Reprints: H30 Vkontakte 2013
H30 Phénix 261/262, p. 10353, 05-06/2016
Input: Gerd Wilts, 2006-12-05
Last update: A.Buchanan, 2017-09-07 more...
10 - P1068645
Roberto Osorio
Jorge Joaquin Lois

Moutecidis Fougiaxis Prentos Jubiläumst. 12/2006
1. ehrende Erwähnung K. Prentos 40 Jahre
P1068645
(13+13) C+
BP in 17,0
1. a4 Sa6 2. a5 Sc5 3. a6 c6 4. axb7 Da5 5. b8=L La6 6. Lg3 0-0-0 7. f4 Kb8 8. Kf2 Tc8 9. f5+ Tc7 10. f6 Lb5 11. fxe7 a6 12. e8=L Ld6 13. Lxf7 Se7 14. La2 Dxa2 15. Kf3 Tf8+ 16. Kg4 Txf1 17. Lf2 Txf2
play all play one stop play next play all
Silvio Baier: C+ (Euclide 0.95) (2010-02-02)
paul: BB Prentos theme (2020-11-29)
comment
Keywords: Unique Proof Game, Ceriani-Frolkin Theme (LL)
Genre: Retro
Computer test: Euclide 0.95
FEN: 1k6/2rpn1pp/p1pb4/1bn5/6K1/8/qPPPPrPP/RNBQ2NR
Reprints: (3) StrateGems 10/2007
Input: Gerd Wilts, 2006-12-21
Last update: A.Buchanan, 2014-05-11 more...
11 - P1070094
Roberto Osorio
Jorge Joaquin Lois

2322 Orbit 38 04/2008
P1070094
(14+14) C+
BP in 17.0
1. c4 Sc6 2. Dc2 Se5 3. Dg6 hxg6 4. f4 Th3 5. Kf2 Tb3 6. axb3 Sg4 7. Kg3 e5 8. Ta6 La3 9. Tf6 a5 10. Kh4 Ta6 11. Kg5 Td6 12. h4 b6 13. Th3 Lb7 14. Tc3 Td3 15. bxa3 Tg3 16. Te3 Lf3 17. Te4 Sxf6#
play all play one stop play next play all
paul: 17.--S4xf6# (2020-11-30)
more ...
comment
Keywords: Unique Proof Game
Genre: Retro
Computer test: Natch 3.1 (19 m)
FEN: 3qk1n1/2pp1pp1/1p3np1/p3p1K1/2P1RP1P/PP3br1/3PP1P1/1NB2BN1
Input: Gerd Wilts, 2008-09-15
Last update: Alfred Pfeiffer, 2018-12-27 more...
12 - P1080589
Roberto Osorio
Jorge Joaquin Lois

(O5) StrateGems 10-12/2007
P1080589
(14+12) C+
BP in 15,0
1. f4 d5 2. f5 Le6 3. f6 Sd7 4. fxe7 f5 5. exf8=L Se7 6. a4 Sc8 7. Ld6 Dh4 8. Lg3 0-0 9. a5 Tf6 10. a6 Tg6 11. axb7 Tg5 12. b8=D g6 13. Dxa7 Kg7 14. Da2 Txa2 15. Lf2 Dxf2+
play all play one stop play next play all
Silvio Baier: 1.f4 d5 2.f5 Le6 3.f6 Sd7 4.fe f5 5.efL Se7 6.a4 Sc8 7.Ld6 Dh4 8.Lg3 0-0 9.a5 Tf6 10.a6 Tg6 11.ab Tg5 12.b8D g6 13.D:a7 Kg7 14.Da2 T:a2 15.Lf2 D:f2+
Rundläufe zweier Bauern mit anschließendem Schlag - damit auch Ceriani-Frolkin(DL); C+ (Euclide 0.95) (2010-02-16)
paul: QB Prentos theme (2020-11-29)
comment
Keywords: Unique Proof Game, Ceriani-Frolkin Theme (DL), Pure Round Trip (BB), Homebase (W)
Genre: Retro
Computer test: Euclide 0.95
FEN: 2n5/2pn2kp/4b1p1/3p1pr1/8/8/rPPPPqPP/RNBQKBNR
Input: Gerd Wilts, 2009-01-11
Last update: A.Buchanan, 2015-04-06 more...
13 - P1080625
Roberto Osorio
Jorge Joaquin Lois

R133 Problem Paradise 01-03/2006
P1080625
(13+15) C+
BP in 19,5
1. d4 Sc6 2. Dd3 Tb8 3. Da6 bxa6 4. Sf3 Tb5 5. Sh4 Th5 6. Sf5 d5 7. Sh6 gxh6 8. g4 Lg7 9. g5 Le5 10. g6 Sf6 11. g7 Sd7 12. g8=S Sdb8 13. Sf6 exf6 14. dxe5 Se7 15. e6 Sg8 16. e7 Kd7 17. e8=D+ Kd6 18. Da4 Ld7 19. c3 Le8 20. Dd1
play all play one stop play next play all
paul: This PG (with bBe8) was ranked first (judge K. Prentos) (2020-12-01)
more ...
comment
Keywords: Unique Proof Game, Interchange (ss), Pronkin Theme (D), Ceriani-Frolkin Theme (S), Excelsior (w), Promotion (SD), under-promotion
Genre: Retro
Computer test: C+ Natch 3.1 No solution for 19.0 moves
FEN: 1n1qb1nr/p1p2p1p/p2k1p1p/3p3r/8/2P5/PP2PP1P/RNBQKB1R
Input: Gerd Wilts, 2009-01-17
Last update: A.Buchanan, 2020-12-01 more...
14 - P1098611
Jorge Joaquin Lois
5629 Phénix 172 04/2008
P1098611
(13+13)
BP in 21,5
1. h4 g5 2. hxg5 c5 3. Th6 c4 4. Tb6 axb6 5. Sc3 Ta3 6. Sb5 Te3 7. fxe3 c3 8.
dxc3 h5 9. Dd5 Th6 10. Ld2 Tf6 11. 0-0-0 Txf1 12. Le1 Tf4 13. Df3 f5 14. Td6 Td4
15. Tf6 exf6 16. Sa3 De7 17. Sb1 Da3 18. Ld2 Da8 19. a4 La3 20. Kd1 d6 21. Ke1
Kd7 22. Lc1
play all play one stop play next play all
Henrik Juel: Natch 3.1 did little in half an hour
Stopped at pos. 1 (2018-12-27)
paul: 1.h4 g5 2.hxg5 c5 3.Rh6 c4 4.Rb6 axb6 5.Sc3 Ra3 6.Sb5 Re3 7.fxe3 c3 8.dxc3 h5 9.Qd5 Rh6 10.Bd2 Rf6 11.O-O-O Rxf1 12.Be1 Rf4 13.Qf3 f5 14.Rd6 Rd4 15.Rf6 exf6 16.Sa3 Qe7 17.Sb1 Qa3 18.Bd2 Qa8 19.a4 Ba3 20.Kd1 d6 21.Ke1 Kd7 22.Bc1. Hidden white castling. (2020-12-01)
comment
Keywords: Unique Proof Game, Castling Paradox
Genre: Retro
FEN: qnb3n1/1p1k4/1p1p1p2/5pPp/P2r4/b1P1PQ2/1PP1P1P1/1NB1K1N1
Input: Gerd Wilts, 2010-01-31
Last update: James Malcom, 2020-12-02 more...
15 - P1243394
Nicolas Dupont
Roberto Osorio
Jorge Joaquin Lois

15121 Die Schwalbe 253 02/2012
P1243394
(12+14)
KBP in 17.0
paul: Solution: 1. Pd2-d4 Pg7-g6 2. Pd4-d5 Bf8-h6 3. Pd5-d6 Bh6-g5 4. Pd6xc7 Pd7-d5 5. Pa2-a4 Qd8-d7 6. Pa4-a5 Qd7-g4 7. Pa5-a6 Bc8-f5 8. Pc7-c8=B Ng8-h6 9. Bc8-d7 Nb8xd7 10. Pa6xb7 Nd7-f6 11. Pb7-b8=B Nf6-h5 12. Bb8-d6 0-0-0 13. Bc1-f4 Rd8xd6 14. Pe2-e3 Rd6-f6 15. Bf4-b8 Pa7-a5 16. Bf1-a6 Kc8xb8 17. Ba6-c8 Rh8xc8
C+ (Euclide) (2013-05-14)
paul: BB Prentos theme (2020-12-02)
comment
Keywords: Unique Proof Game, Ceriani-Frolkin Theme (LL), Anti-Pronkin Theme (LL)
Genre: Retro
FEN: 1kr5/4pp1p/5rpn/p2p1bbn/6q1/4P3/1PP2PPP/RN1QK1NR
Input: Mario Richter, 2012-06-29
Last update: Mario Richter, 2012-06-29 more...
16 - P1338394
Göran Wicklund
J.Lois-70 JT 2016-2017
2nd Honorable Mention
P1338394
(12+14) cooked
PG in 33.0
1. Sf3 a5 2. Sd4 a4 3. Sb3 axb3 4. a4 Ta5 5. Ta2 bxa2 6. h4 a1=S 7. h5 Sb3 8. h6 Sd4 9. hxg7 Sf5 10. gxh8=L Sh4 11. Le5 f5 12. Lh2 e5 13. g3 La3 14. Lg2 Se7 15. Lc6 dxc6 16. 0-0 Sd7 17. Kh1 Sf8 18. Lg1 Dd5+ 19. Kh2 Kd7 20. Kh3 Dh1+ 21. Lh2 e4 22. Tg1 Te5 23. Df1 c5 24. Dg2 Kc6 25. Df3 Kb6 26. Tg2 Dd1 27. Tg1 Ka5 28. Te1 b6 29. Lg1 La6 30. Kh2 Ld3 31. Kh1 c4 32. Lh2 c5 33. Kg1 Dxe1#
play all play one stop play next play all
Judge J. Lois: This problem presents the theme Lois between the wK1-WBh2(2) with a switchback of both pieces.
In addition, change of place between WKe1-wRh1 in move 31.
Henrik Juel: In the award this proof game is not labelled C+ (2017-08-30)
Michel Caillaud: reported as cooked in Winchloé :
1.a4 b5 2.Ta3 b4 3.h4 bxa3 4.h5 a2 5.h6 a1=S 6.hxg7 Sb3 7.gxh8=L Sd4 8.Le5 Sf5 9.Lh2 e5 10.g3 La3 11.Lg2 La6 12.Lc6 dxc6 13.Kf1 c5 14.Kg2 Kd7 15.Sh3 Kc6 16.Sf4 Kb6 17.Sd5+ Ka5 18.Sb6 axb6 19.Kh3 Dd5 20.Tg1 Dh1 21.Df1 e4 22.Dg2 Sd7 23.Df3 Te8 24.Tg2 Dd1 25.Tg1 Te5 26.Te1 Sf8 27.Lg1 Sge7 28.Lh2 Sh4 29.Lg1 f5… (2020-10-14)
more ...
comment
Keywords: Unique Proof Game, Non-standard material, Lois Theme
Genre: Retro
FEN: 5n2/4n2p/1p6/k1p1rp2/P1p1p2n/b2b1QP1/1PPPPP1B/1NB1q1K1
Input: A.Buchanan, 2017-08-30
Last update: A.Buchanan, 2020-10-15 more...
17 - P1360119
Marken Foo
www.chess.com 2016
P1360119
(14+12)
PG in 7.0 moves
Add the black queen
b) +wSb1
Marken Foo: There is a twin (b) +wSb1 pointed out by the chess.com user caveatcanis back in 2016, when accidentally misreading the diagram. It turns out to be a cute twin that fits the idea. (2020-10-21)
A.Buchanan: How many of these "Where in the world is Carmen Sandiego?" problems have you got, Marken? is it worth making a keyword? https://en.wikipedia.org/wiki/Carmen_Sandiego (2020-10-21)
comment
Keywords: Unique Proof Game, Add pieces (d)
Genre: Retro
FEN: rnbN1knr/pppppp2/8/8/8/8/PPPPPPP1/R1BQKB1R
Reprints: 9 Phénix 287, p. 11252, 07-08/2018
Input: A.Buchanan, 2019-01-25
Last update: A.Buchanan, 2020-10-21 more...
18 - P1380663
Pascal Wassong
RIFACE 2016
1st prize
P1380663
(15+16)
Partie Justificative en 9,5 coups
Cylindre vertical
1. d4 Sf6 2. Lh6 Tg8 3. e3 Tah8 4. Da6 Sxa6 5. Sd2 Tb8 6. 0-0-0 Tba8 7. Kb1 Sb8 8. La6 Tgh8 9. Sf1 Sg8 10. Le1
play all play one stop play next play all
Henrik Juel: C+ Jacobi 0.7.5
1.d4 Sf6 2.Bh6 Rg8 3.e3 Rah8 4.Qa6 Sxa6 5.Sd2 Rb8 6.O-O-O Rba8 7.Kb1 Sb8 8.Ba6 Rgh8 9.Sf1 Sg8 10.Be1
On a standard board Black would have made an even number of moves; not so here, with Ra8-h8-b8-a8 (2020-10-05)
comment
Keywords: Unique Proof Game, Cylinder (vertical), Homebase (s), RIFACE Retro Composition Tourney (2016)
Genre: Retro, Fairies
FEN: rnbqkbnr/pppppppp/B7/8/3P4/4P3/PPP2PPP/1K1RBNNR
Input: A.Buchanan, 2020-10-05
Last update: A.Buchanan, 2020-10-06 more...
19 - P1380664
Michel Caillaud
RIFACE 2016
2nd prize
P1380664
(15+15) C+
Partie Justificative en 7,5 coups
Cylindre vertical
more ...
comment
Keywords: Unique Proof Game, Cylinder (vertical), RIFACE Retro Composition Tourney (2016)
Genre: Retro, Fairies
Computer test: C+ Jacobi
FEN: r1bq1bnr/ppppp1pp/k3R3/6n1/7P/8/PPPP1PP1/RNBQKBN1
Input: A.Buchanan, 2020-10-05
Last update: A.Buchanan, 2020-10-06 more...
20 - P1380665
Michel Caillaud
Philippe Rouzaud

RIFACE 2016
1st honourable mention
P1380665
(14+15) cooked
Partie Justificative en 15,0 coups
Cylindre vertical
Henrik Juel: Jacobi 0.7.5 was too slow (for me) (2020-10-05)
Michel Caillaud: cooked (2020-10-05)
comment
Keywords: Unique Proof Game, Cylinder (vertical), RIFACE Retro Composition Tourney (2016)
Genre: Retro, Fairies
FEN: 1nb2rk1/1pBppp2/1qpr2pn/7p/2PP1P2/5P1N/PP2B2K/1N2bQRR
Input: A.Buchanan, 2020-10-05
Last update: A.Buchanan, 2020-10-06 more...
21 - P1380666
Thierry Le Gleuher
Pascal Wassong
Jacques Dupin

RIFACE 2016
2nd honourable mention
P1380666
(14+15)
Partie Justificative en 8,0 coups
Cylindre vertical
Henrik Juel: C+ Jacobi 0.7.5
1.Sf3 b5 2.Sh4 Bf3 3.gxf3 b4 4.Bc6 dxc6 5.h3 Qd6 6.Rh2 Qxh2 7.Sg2 Qd6 8.O-O-O-O Qd8
Looks like kingside castling, but is loong castling with [Ra1] (2020-10-05)
comment
Keywords: Unique Proof Game, Cylinder (vertical), RIFACE Retro Composition Tourney (2016)
Genre: Retro, Fairies
FEN: rn1qkbnr/p1p1pppp/2p5/8/1p6/5P1P/PPPPPPN1/1NBQ1RK1
Input: A.Buchanan, 2020-10-05
Last update: A.Buchanan, 2020-10-05 more...
22 - P1380667
Thierry Le Gleuher
RIFACE 2016
3rd honourable mention
P1380667
(15+13)
Partie Justificative en 9,0 coups
Cylindre vertical
Henrik Juel: C+ Jacobi 0.7.5
Cylinder-specific mate with triple-check (2020-10-05)
comment
Keywords: Unique Proof Game, Cylinder (vertical), RIFACE Retro Composition Tourney (2016)
Genre: Retro, Fairies
FEN: rnbqkb2/pppp1p2/7N/7p/8/K3r3/PPPPP1PP/R1BQ1BNR
Input: A.Buchanan, 2020-10-05
Last update: A.Buchanan, 2020-10-05 more...
23 - P1380668
Michel Caillaud
RIFACE 2016
1st commendation
P1380668
(0+1)
Compléter la position pour
une Partie Justificative en 6,0
coups, se terminant par un
échecs quadruple (C+)
Cylindre vertical
1. e4 e6 2. Dxb7 Da3 3. Dxa7 Txa7 4. e5 Tb7 5. Ke2 Da8 6. Kf3 Tb3++++
play all play one stop play next play all
Henrik Juel: This proof game is C+ Jacobi 0.7.5 (2020-10-06)
A.Buchanan: Thanks Henrik: wish we could show any solution in the animation, by including a sequence of actual diagrams where a fairy move cannot be animated directly. All this requires to implement this is some documentation (2020-10-07)
comment
Keywords: Unique Proof Game, Cylinder (vertical), RIFACE Retro Composition Tourney (2016)
Genre: Retro, Fairies
FEN: 8/8/4p3/8/8/8/8/8
Input: A.Buchanan, 2020-10-05
Last update: A.Buchanan, 2020-10-06 more...
24 - P1380669
Marco Bonavoglia
RIFACE 2016
2nd commendation
P1380669
(14+15) C+
Partie Justificative en 5,0 coups
2 solutions
Cylindre vertical
more ...
comment
Keywords: Unique Proof Game, Cylinder (vertical), RIFACE Retro Composition Tourney (2016)
Genre: Retro, Fairies
Computer test: C+ Jacobi
FEN: rnbqk1n1/1pppppb1/p5pp/8/2P1P3/3P4/PP3PPP/RN2KBNR
Input: A.Buchanan, 2020-10-05
Last update: A.Buchanan, 2020-10-06 more...
25 - P1380676
Pascal Wassong
Axel Gilbert

RIFACE 2015
3rd Place
P1380676
(16+16)
Partie justificative en 12,5 coups
Anti Take & Make
Henrik Juel: Jacobi 0.7.5 was too slow for me (2020-10-05)
comment
Keywords: Anti-Take & Make, Unique Proof Game, RIFACE Retro Composition Tourney (2015)
Genre: Retro, Fairies
FEN: rnbq1knr/p2P1P2/1P1ppp1P/8/7p/b1P1P1PR/2p1p1pP/1NBQKBNR
Input: A.Buchanan, 2020-10-05
Last update: A.Buchanan, 2020-10-07 more...
26 - P1380678
Pascal Wassong
Axel Gilbert

RIFACE 2015
4th Place
P1380678
(16+16)
Partie justificative en 8,0 coups
Anti Take & Make
Henrik Juel: C+ Jacobi 0.7.5
1.Sf3 Sc6 2.Se5 Sxe5 [+wSc6] 3.g3 Sd3+ 4.cxd3 [+bSc5] Se4 5.dxe4 [+bSd6] Sf5 6.exf5 [+bSh4] Sg6 7.fxg6 [+bSe5] Sxc6 [+wSb8] 8.Bg2 Sxb8 [+wSa6] (2020-10-05)
comment
Keywords: Anti-Take & Make, Unique Proof Game, RIFACE Retro Composition Tourney (2015), Homebase (s)
Genre: Retro, Fairies
FEN: rnbqkbnr/pppppppp/N5P1/8/8/6P1/PP1PPPBP/RNBQK2R
Input: A.Buchanan, 2020-10-05
Last update: A.Buchanan, 2020-10-07 more...
27 - P1380679
Allan Bell
RIFACE 2015
5th Place
P1380679
(16+16)
Partie justificative en 13,5 coups
Anti Take & Make
Henrik Juel: Jacobi 0.7.5 was too slow for me (2020-10-05)
comment
Keywords: Anti-Take & Make, RIFACE Retro Composition Tourney (2015), Unique Proof Game
Genre: Retro, Fairies
FEN: 1nb1k2r/1Qqpnpbp/1pP1P1P1/r6P/8/1pPp1p1p/PB1NPKPR/R4BN1
Input: A.Buchanan, 2020-10-05
Last update: A.Buchanan, 2020-10-07 more...
28 - P1380681
Marco Bonavoglia
RIFACE 2015
6th Place
P1380681
(16+16)
Partie justificative en 6,0 coups
Anti Take & Make
Henrik Juel: Solution
1.e4 f5 2.exf5 [+bPf4] g5 3.fxg6 e.p. [+bPg4] Sf6 4.g7 Bxg7 [+wPg8=B] 5.Bxh7 [+bPh5] Sxh7 [+wBd3] 6.Bde2 O-O
The Capture-free keyword is misleading: there are lots of captures, but the captured men 'make' a move to re-appear (2020-10-06)
A.Buchanan: Yes Henrik I started putting that on before I read the definition. I will pull those tags off soon. (2020-10-07)
more ...
comment
Keywords: Anti-Take & Make, RIFACE Retro Composition Tourney (2015), Unique Proof Game, Home Circuit (wBe)
Genre: Retro, Fairies
Computer test: C+ Jacobi
FEN: rnbq1rk1/ppppp1bn/8/7p/5pp1/8/PPPPBPPP/RNBQKBNR
Input: A.Buchanan, 2020-10-05
Last update: A.Buchanan, 2020-10-07 more...
29 - P1380682
Oliver Sick
RIFACE 2015
7th Place
P1380682
(16+16)
Partie justificative en 8,0 coups
Anti Take & Make
Henrik Juel: C+ Jacobi 0.7.5
1.Sf3 f6 2.Se5 fxe5 [+wSc4] 3.Sb6 axb6 [+wSc4] 4.Sd6+ exd6 [+wSf7] 5.Sxd8 [+bQf6] Sc6 6.Sxc6 [+bSa5] bxc6 [+wSd4] 7.Sf3 Qxf3 [+wSg1] 8.exf3 [+bQf6] Qd8
Active Sg1 (2020-10-05)
comment
Keywords: Anti-Take & Make, RIFACE Retro Composition Tourney (2015), Unique Proof Game
Genre: Retro, Fairies
FEN: r1bqkbnr/2pp2pp/1ppp4/n3p3/8/5P2/PPPP1PPP/RNBQKBNR
Input: A.Buchanan, 2020-10-05
Last update: A.Buchanan, 2020-10-07 more...
30 - P1380855
James Malcom
MatPlus.net Forum 12/10/2020
P1380855
(14+14) C+
BP in 12.0
1. g3 d6 2. Lg2 Dd7 3. Ld5 Dh3 4. Le6 fxe6 5. a4 Kf7 6. a5 Kg6 7. a6 Kh5 8. axb7 g6 9. bxa8=L Lg7 10. Lg2 Lxb2 11. Sf3 Lg7 12. Lb2 Lb7
play all play one stop play next play all
James Malcom: The theme is that 5 bishops are fianchettoed-one more than normally allowed! (2020-10-13)
Rainer Staudte: Rules allow a 20-bishops-fianchetto. (2020-10-13)
Henrik Juel: Very nice, James
For this short PG any tester will suffice, but if you push this idea further, Natch is much faster than Jacobi (2020-10-13)
A.Buchanan: Can’t a fianchettoed bishop go round to the bank rank and do it again? So even 20 is not a barrier (2020-10-13)
A.Buchanan: Dates in PDB are yyyy-mm-dd or dd/mm/yyyy. Hence I will change publication date from Dec to Oct (2020-10-13)
James Malcom: Right-the date slipped me again!

Andrew, while a bishop can easily be fianchettoed twice+, about the number of bishops doing it, not how many times it is done. I'm sure that an expert could do 6 fianchettoing bishops. (2020-10-13)
A.Buchanan: I am joking James: this is cool already (2020-10-13)
comment
Keywords: under-promotion (L), Phoenix, Impostor (L), Unique Proof Game
Genre: Retro
Computer test: Jacobi v0.7.5
FEN: 1n4nr/pbp1p1bp/3pp1p1/7k/8/5NPq/1BPPPPBP/RN1QK2R
Input: James Malcom, 2020-10-13
Last update: James Malcom, 2020-10-14 more...
31 - P1380896
Andrew Buchanan
MatPlus.net Forum 12/10/2020
P1380896
(13+13) C+
PG in 6.5
(-:
1. b4 g5 2. b5 g4 3. b6 g3 4. bxa7 gxh2 5. axb8=sS! hxg1=wT! 6. Txh7 Txh7 7. Th1
play all play one stop play next play all
The joke here is that pawns may promote to foreign units.
Henrik Juel: The testers probably do not work here, but this seems unique
1.b4 g5 .. 4.bxa7 gxh2 5.axb8=sS hxg1=wT 6.Txh7 Txh7 7.Th1 (2020-10-14)
A.Buchanan: According to Joost De Heer, WinChloe has a category “promotions adverses”, and under this, the problem is C+. Looking now for a full Homebase without utilising promotion to enemy pawn, which makes it too easy (2020-10-15)
comment
Keywords: Unique Proof Game, Joke, Joke promotion (sT), Homebase (w)
Genre: Retro
Computer test: C+ WinChloe
FEN: rnbqkbn1/1ppppp1r/8/8/8/8/P1PPPPP1/RNBQKB1R
Input: A.Buchanan, 2020-10-14
Last update: A.Buchanan, 2020-10-15 more...
32 - P1381369
Andrew Buchanan
MatPlus.net Forum 28/10/2020
P1381369
(14+14)
SPG in 4.0
shortest PG with 4 units captured on 1 square
Henrik Juel: 1.Be2-e3 Ba7-a6 2.Lf1xa6 Bb7xa6 3.Dd1-e2 Lc8-b7 4.De2xa6 Lb7xa6
Very easy and C+ by Natch 3.1
Nice tempo move 3... Lb7 (2020-10-29)
A.Buchanan: Thanks - tempo is to force unique order on Wh moves (2020-10-30)
comment
Keywords: Unique Proof Game, Tempo Move, Task (Construction) (4), Superseded by (P1381879), x pieces capture on one square (4)
Genre: Retro
FEN: rn1qkbnr/2pppppp/b7/8/8/4P3/PPPP1PPP/RNB1K1NR
Input: A.Buchanan, 2020-10-29
Last update: James Malcom, 2020-11-14 more...
33 - P1381525
François Labelle
Phénix 2014
P1381525
(10+11) C+
BP in 10,0
1. e3 d6 2. La6 Lh3 3. Lxb7 Lxg2 4. Lxa8 Lxh1 5. Le4 Lxe4 6. c3 Lxb1 7. Db3 Lxa2 8. Dxa2 f6 9. Dxg8 h6 10. Dxf8 Kxf8
play all play one stop play next play all
AB: I too made this one yesterday but alas on checking in WinChloe found that Francois’ software had got there first! This shows the utility of WinChloe and the power of Francois’ approach. And at least I can be grateful I didn’t try to publish!

This proof game is too long to be found by François’ general mining program, but he can adapt his program specifically to find ornamental problems such as this where the final positions are highly constrained and he can count whether any move is taking him nearer or further away from the right kind of position. The definitively unproductive lines can easily be pruned. Homebases and symmetric positions are also amenable to this kind of attack

See P1381496.
Henrik Juel: Solution
1.Be2-e3 Bd7-d6 2.Lf1-a6 Lc8-h3 3.La6xb7 Lh3xg2
4.Lb7xa8 Lg2xh1 5.La8-e4 Lh1xe4 6.Bc2-c3 Le4xb1
7.Dd1-b3 Lb1xa2 8.Db3xa2 Bf7-f6 9.Da2xg8 Bh7-h6
10.Dg8xf8 Ke8xf8
was found by Natch 3.1, which was stopped before completion
The C+ was probably found by construction, not by testing
The light-colored bishops do most of the work, with the white queen sweeping up at the end (2020-11-04)
A.Buchanan: Thanks Henrik - Natch 3.2 did complete in about 90 minutes. Oh the sadness of anticipation... (2020-11-05)
comment
Keywords: Unique Proof Game, Ornament
Genre: Retro
Computer test: C+ Natch 3.2 in 1hr 32 mins
FEN: 1n1q1k1r/p1p1p1p1/3p1p1p/8/8/2P1P3/1P1P1P1P/R1B1K1N1
Input: A.Buchanan, 2020-11-04
Last update: A.Buchanan, 2020-11-05 more...
34 - P1381791
James Malcom
Facebook 26/09/2020
P1381791
(16+15) C+
BP in 6.5
Where did the Black queen disapear?
1. g3 b6 2. Lh3 La6 3. Lg4 Dc8 4. Sh3 Db7 5. 0-0 Dh1+ 6. Kxh1 Lc8 7. Te1
play all play one stop play next play all
more ...
comment
Keywords: Unique Proof Game, Castling
Genre: Retro
Computer test: C+ Natch 3.1
FEN: rnb1kbnr/p1pppppp/1p6/8/6B1/6PN/PPPPPP1P/RNBQR2K
Input: James Malcom, 2020-11-12
Last update: Alfred Pfeiffer, 2020-11-13 more...
35 - P1381879
Andrew Buchanan
MatPlus.net Forum 3/11/2020
P1381879
(13+13) C+
BP in 7.0
1. e4 a6 2. Lxa6 bxa6 3. De2 Lb7 4. Dxa6 Sxa6 5. b4 Db8 6. b5 Da7 7. bxa6 Dxa6
play all play one stop play next play all
Inspired by P1381620

See also P1381369
Henrik Juel: C+ Natch 3.1
1.Be2-e4 Ba7-a6 2.Lf1xa6 Bb7xa6 3.Dd1-e2 Lc8-b7
4.De2xa6 Sb8xa6 5.Bb2-b4 Dd8-b8 6.Bb4-b5 Db8-a7
7.Bb5xa6 Da7xa6
Six captures on a6 (2020-11-14)
comment
Keywords: Unique Proof Game, Task (Construction) (6), x pieces capture on one square (6)
Genre: Retro
Computer test: Natch 3.1
FEN: r3kbnr/1bpppppp/q7/8/4P3/8/P1PP1PPP/RNB1K1NR
Input: A.Buchanan, 2020-11-14
Last update: Alfred Pfeiffer, 2020-11-16 more...
36 - P1382408
Thierry Le Gleuher
Gunter Jordan
Raúl Jordan
Roberto Osorio

15 feenschach 237, p. 224, 09-10/2019
P1382408
(12+11) C+
BP in 9.5
1. d4 a5 2. d5 a4 3. d6 a3 4. dxc7 axb2 5. cxb8=D bxc1=D 6. Dxc8 Dg5 7. Dc4 Dxg2 8. Dxf7+ Kxf7 9. Lxg2 Ke8 10. Lf1
play all play one stop play next play all
Silvio-Baier-40-JT: Thema: Gesucht waren eindeutige orthodoxe Beweispartien mit weißer und schwarzer Homebasestellung, wobei auf jeder Seite ein Bauer umwandeln und von einer Figur (keinem Bauern) geschlagen werden sollte und zudem genau ein Stein eine zweizügige Rückkehr vollführt.
A.Buchanan: Can anyone send me the full results of this JT please? I have an unpublished one which is similar in theme, and I want to confirm that I’m not anticipated. I will load all problems into PDB if they’re not already here (2020-11-26)
comment
Keywords: Unique Proof Game, Homebase (2), Prentos Theme (Dd), Switchback (Lk), Ceriani-Frolkin Theme (Dd)
Genre: Retro
FEN: r2qkbnr/1p1pp1pp/8/8/8/8/P1P1PP1P/RN1QKBNR
Input: Gunter Jordan, 2020-11-25
Last update: A.Buchanan, 2020-11-25 more...
37 - P1382432
Andrew Buchanan
Facebook 26/11/2020
P1382432
(11+15) C+
KBP
1. g4 h5 2. Lg2 hxg4 3. Lf3 gxf3 4. Kf1 fxe2+ 5. Kg2 exd1=T! 6. Kf3! Txc1 7. Ke2 Te1+ 8. Kxe1
play all play one stop play next play all
Henrik Juel: Excellent find, Andrew
Hint: length is 7.5 (2020-11-25)
A.Buchanan: Thanks Henrik - amazed to find it’s not in WinChloe or Yacpdb (2020-11-26)
A.Buchanan: The animation fails for "SPG", instead "KBP" is needed. (2020-11-26)
more ...
comment
Keywords: Unique Proof Game, Homebase (2), Pure Round Trip (K5), Ceriani-Frolkin Theme (t), Prentos Theme (t), Tempo Loss
Genre: Retro
Computer test: C+ Natch 3.1 C+ Euclide 1.01 for 6.0, 6.5, 7.0 & 7.5 moves, which is conclusive.
FEN: rnbqkbnr/ppppppp1/8/8/8/8/PPPP1P1P/RN2K1NR
Reprints: chess.stackexchange.com 26/11/2020
Input: A.Buchanan, 2020-11-25
Last update: A.Buchanan, 2020-11-26 more...
38 - P1382488
Andrew Buchanan
Thomas Thannheiser

1509 Julias Fairies 25/05/2020
P1382488
(13+15) C+
PG in 8.5
Alphabetic Chess
Aims to be the shortest SPG for a homebase position which demonstrates this fairy condition.
Henrik Juel: I cheated and used Jacobi
Nice condition-specific manouver by Sb1 (2020-11-26)
comment
Keywords: Unique Proof Game, Homebase (2), Alphabetic Chess, Economy record (Alphabetic homebase)
Genre: Retro, Fairies
Computer test: Jacobi v0.4.7
FEN: rnbqkbnr/1ppppppp/8/8/8/8/2PPPPPP/1NBQKBNR
Input: A.Buchanan, 2020-11-26
Last update: A.Buchanan, 2020-11-26 more...
Show statistic for complete result.

The problems of this query have been registered by the following contributors:

Gerd Wilts (14)
Mario Richter (1)
A.Buchanan (20)
James Malcom (2)
Gunter Jordan (1)