Die Schwalbe

43 problem(s) found in 7363 milliseconds (displaying 43 problem(s)). [COMMENTDATE>=20200919 AND NOT K='Hilfsrückzüger' AND NOT K='a posteriori (AP)' AND A='Prentos, Kostas'] [download as LaTeX]

1 - P0001765
Kostas Prentos
26 Phénix 1 05/1988
P0001765
(11+15) cooked
BP in 18,5
1. Sf3 f5 2. Sd4 Kf7 3. Sb5 Kg6 4. Sd6 exd6 5. e4 Le7 6. e5 Lh4 7. e6 Df6 8. e7 Dxb2 9. e8=S Se7 10. Lc4 Tf8 11. 0-0 Tf6 12. f3 Kh5 13. Te1 Th6 14. Lf7+ Sg6 15. Te7 Dxc1 16. De1 Dxd2 17. De6 dxe6 18. Td7 Dg5 19. Sxg7#
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Cook: 1. d4 g5 2. Sf3 Lg7 3. e4 Lxd4 4. e5 Lxb2 5. Dd6 exd6 6. e6 f5 7. e7 Kf7 8. e8=S Se7 9. Sxg5+ Kg6 10. Lc4 Kh5 11. 0-0 Tg8 12. Te1 Tg6 13. f3 Th6 14. Lf7+ Sg6 15. Te7 Lf6 16. Se6 dxe6 17. Td7 Lh4 18. Lg5 Dxg5 19. Sg7#
Kostas Prentos: A correction was published in Phenix, 2009 (No.186/Pg.7979)
Solution:
1. Sf3 f5 2. Sd4 Kf7 3. Sb5 Kg6 4. Sd6 exd6 5. e4 Le7 6. e5 Lh4 7. e6 Dg5 8. e7 Dg3 9. e8=T Se7 10. Lc4 Tf8 11. 0-0 Tf6 12. f3 Kh5 13. Te1 Th6 14. Lf7+ Sg6 15. T1e6 dxe6 16. Txc8 Sd7 17. Th8 Txh8 18. Le8 (2022-12-08)
Moldenhauer: Computerprüfung: Cooked Stelvio 1.2 00:33:56 Minuten. (hh:mm:ss)
Keine Lösung: BP 17.5, BP 18.0.
Beispiel: 1.Sf3 f5 2.d4 Kf7 3.e4 g5 4.Lc4+ Kg6 5.e5 Lg7 6.e6 Lxd4
7.0–0 Lxb2 8.Dd6 exd6 9.e7 Kh5 10.e8S Se7 11.Te1 Tf8 12.Sxg5 Tf6
13.f3 Th6 14.Lf7+ Sg6 15.Te7 Lf6 16.Se6 dxe6 17.Td7 Lh4 18.Lg5 Dxg5
19.Sg7# (2023-05-30)
comment
Keywords: Unique Proof Game, Castling, Promotion
Genre: Retro
FEN: rnb5/pppR1BNp/3pp1nr/5pqk/7b/5P2/P1P3PP/RN4K1
Input: Gerd Wilts, 1995-06-03
Last update: Gerd Wilts, 2006-10-15 more...
2 - 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#
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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...
3 - P0007474
Kostas Prentos
5673v feenschach 1989
1. ehrende Erwähnung
P0007474
(11+14) cooked
BP in 15,0
1. a4 e6 2. Ta3 Ld6 3. Tb3 Lg3 4. Tb6 axb6 5. hxg3 Txa4 6. Th6 Ta1 7. Tg6 hxg6 8. Sa3 Th1 9. Sc4 Dh4 10. Sa5 bxa5 11. gxh4 b6 12. g3 Lb7 13. Lh3 Lg2 14. Lg4 Lh3 15. Lh5 gxh5
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Version zur inkorrekten P0002312
Cook: 1. a3 e6 2. h4 Lxa3 3. Sxa3 h5 4. Sb5 Th6 5. Ta6 Tf6 6. Tb6 Tf3 7. Sd4 Th3 8. Sc6 Txh1 9. Sxd8 axb6 10. Sc6 Ta1 11. Sa5 bxa5 12. g3 b6 13. Lg2 Lb7 14. Kf1 Lxg2+ 15. Ke1 Lh3
Kostas Prentos: Here is a computer tested correction: PG 12,5

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

C+ Euclide v1.11 (42 h 2 min 37 sec} (2022-12-08)
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comment
Keywords: Unique Proof Game
Genre: Retro
Computer test: cooked by Stelvio 0.92
FEN: 1n2k1n1/2pp1pp1/1p2p3/p6p/7P/6Pb/1PPPPP2/r1BQK1Nr
Reprints: feenschach 115 01-09/1995
Input: Gerd Wilts, 1996-08-31
Last update: A.Buchanan, 2022-12-04 more...
4 - P1003984
Kostas Prentos
R0097 StrateGems 18 04-06/2002
2. Lob
P1003984
(11+12) C+
BP in 17,0
1. d4 c6 2. Dd3 Db6 3. Dg6 Db3 4. axb3 hxg6 5. Ta6 Th3 6. Tb6 Tg3 7. hxg3 axb6 8. Th7 Ta2 9. Lh6 gxh6 10. e3 Lg7 11. La6 Le5 12. c4 Ld6 13. Sc3 La3 14. bxa3 Txf2 15. Sge2 d5 16. Kd2 Lh3 17. gxh3 bxa6
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4mal Überkreuzschlag (wBBa2b2 und g2h2, sBa7b7 und g7h7).
paul: The first 16.5 moves are unique (Euclide 0.96) (2010-07-05)
Henrik Juel: Natch 3.1 did not even find the solution in an hour (2018-12-16)
Moldenhauer: Computerprüfung: nachrichtlich C+ Stelvio 1.6 nach ca. 520 Std.
Natch 3.3 hat hier noch einen klaren Vorteil.
Stelvio wird ja weiter verbessert, wie ich bemerkt habe. (2023-10-02)
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comment
Keywords: Unique Proof Game, Cross-capture (4)
Genre: Retro
Computer test: KP: C+ Natch 3.3 (24 hours 32 min) I stopped Stelvio 1.0 after 93 hours of testing
FEN: 1n2k1n1/4pp1R/ppp3pp/3p4/2PP4/PPN1P1PP/3KNr2/8
Reprints: (89) Die Schwalbe 250A 08/2011
Input: Gerd Wilts, 2002-04-05
Last update: A.Buchanan, 2023-03-20 more...
5 - P1004372
Dan Meinking
Kostas Prentos

P0118 StrateGems 21 01-03/2003
Spezialpreis
P1004372
(11+13) C+
BP in 17,5
1. h4 b6 2. h5 La6 3. h6 Ld3 4. hxg7 h5 5. gxf8=S Th7 6. Se6 fxe6 7. Sc3 Kf7 8. Sd5 exd5 9. Th4 Ke6 10. Tc4 dxc4 11. c3 Kd5 12. Db3 cxb3 13. a3 Kc4 14. Ta2 bxa2 15. exd3 Kb3 16. Le2 a1=L 17. Ld1 Ka2 18. b3
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Der schwarze K verfolgt den sBf7.
Kostas Prentos: This version is cooked: 1. h4 g5 2. hxg5 b6 3. Th5 La6 4. b3 Ld3 5. exd3 Lg7 6. Df3 Lxa1 7. Dxf7+ Kxf7 8. Le2 Ke6 9. Ld1 Kd5 10. Lb2 Kc5 11. Ld4 Kb4 12. Sc3 Ka3 13. g6 Kb2 14. a3 hxg6 15. Sa2+ Kxa2 16. Lb2 Th7 17. Lc1 gxh5 18. c3

A correction was published in StrateGems, 2018 (No.82/Pg.92, P0118v): PG 17,5:
1. h4 b6 2. h5 Lb7 3. h6 Lf3 4. hxg7 Sc6 5. gxf8=S Tb8 6. Se6 fxe6 7. Th5 Kf7 8. Td5 exd5 9. exf3 Ke6 10. Lc4 dxc4 11. c3 Kd5 12. Db3 cxb3 13. a3 Kc4 14. Ta2 bxa2 15. Ke2 Kb3 16. Kd3 a1=L 17. Se2 Ka2 18. b3 (C+) (2022-12-08)
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comment
Keywords: Unique Proof Game
Genre: Retro
Computer test: Natch 3.1
FEN: rn1q2n1/p1ppp2r/1p6/7p/8/PPPP4/k2P1PP1/b1BBK1N1
Reprints: feenschach 153 10-12/2003
Input: Gerd Wilts, 2003-01-02
Last update: James Malcom, 2020-11-14 more...
6 - P1017456
Andrey Frolkin
Kostas Prentos

feenschach 154 2004
2. Preis Retro-Kompositionsturnier
P1017456
(13+14) C+
BP in 27,5
1. f4 e5 2. f5 e4 3. f6 e3 4. fxg7 exd2 5. Kf2 a5 6. e4 a4 7. e5 a3 8. e6 axb2 9. Sa3 b1=T 10. e7 Tb6 11. Tb1 d5 12. Tb5 d4 13. Lb2 d3 14. Da1 dxc2 15. Ld3 c1=T 16. Se2 Tb1 17. Tc1 d1=T 18. Tc4 Tdc1 19. Lc2 Dd1 20. Ke3 Dh1 21. Kd4 Td6+ 22. Kc5 c6 23. Kb6 Lh3 24. Kxb7 Kd7 25. e8=T Se7 26. g8=T Lh6 27. Tg7 Tdd1 28. Teg8
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Zyklischer Platzwechsel der sUWTTb1, c1, d1
Kostas Prentos: C+ Natch 3.3 (13 h 17 min 58 sec) (2022-12-08)
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Keywords: Unique Proof Game, Interchange
Genre: Retro
Computer test: KP: C+ Stelvio 1.0 tested this one in 1 min 46 sec.
FEN: rn4Rr/1K1knpRp/2p4b/1R6/2R5/N6b/PBB1N1PP/Qrrr3q
Reprints: Messigny 05/2004
Input: Gerd Wilts, 2004-06-03
Last update: A.Buchanan, 2023-03-20 more...
7 - P1017461
Kostas Prentos
Andrey 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
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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...
8 - P1017464
Andrey 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
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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...
9 - P1066769
Kostas Prentos
Andrey Frolkin

4523 Phénix 128 04/2004
P1066769
(9+16) C+
BP in 22,0
1. c4 Sf6 2. Db3 Se4 3. Db6 axb6 4. c5 Ta3 5. c6 bxc6 6. d4 La6 7. Lf4 Sd2 8. e4 Le2 9. Ld6 Td3 10. a4 cxd6 11. a5 bxa5 12. h4 Db6 13. h5 Db3 14. h6 gxh6 15. Th5 Lg7 16. Tb5 cxb5 17. d5 Ld4 18. Sh3 f6 19. Sf4 Kf7 20. Se6 Tc8 21. f4 Tc2 22. Sc5 dxc5
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paul: C+ for the first 20.5 moves.(Euclide) (2017-07-24)
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comment
Keywords: Unique Proof Game
Genre: Retro
Computer test: KP: C+ Fully tested with Stelvio 1.0 (on two computers) in combined time of approximately 667 hours. Reto: And also with Stelvio 1.62 in about 5 hours.
FEN: 1n6/3ppk1p/5p1p/pppP4/3bPP2/1q1r4/1Prnb1P1/RN2KB2
Input: Gerd Wilts, 2004-09-30
Last update: Reto, 2023-09-11 more...
10 - P1068490
Kostas Prentos
Andrey Frolkin

13077 Die Schwalbe 219 06/2006
Werner Keym gewidmet
1. Preis
P1068490
(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+
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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)
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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...
11 - P1070050
Kostas Prentos
PCCC Meeting 09/2008
2. Preis
P1070050
(13+16) C+
BP in 19.0
1. e4 h5 2. Le2 h4 3. Lh5 a5 4. Dg4 a4 5. Se2 a3 6. 0-0 axb2 7. a4 Th6 8. Ta3 Tg6 9. Tf3 f5 10. d3 Kf7 11. Lg5 Ke6 12. Sd2 Ke5 13. Tb1 fxe4 14. Sc1 Kd4 15. c4 Kc3 16. Sdb3 exd3 17. De4 Kc2 18. g4 Kd1 19. Kg2 d2
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James Malcom: According to https://chess-problems-gr.blogspot.com/2008/, this is the record for 6 pin lines of the piece sBf7. Quite impressive indeed. (2020-12-23)
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comment
Keywords: Unique Proof Game
Genre: Retro
Computer test: C+ Euclide (Henrik Juel)
FEN: rnbq1bn1/1pppp1p1/6r1/6BB/P1P1Q1Pp/1N3R2/1p1p1PKP/1RNk4
Input: Gerd Wilts, 2008-09-11
Last update: James Malcom, 2020-12-23 more...
12 - P1080525
Andrey Frolkin
Kostas Prentos

P0190 StrateGems 34 2006
1. Lob
P1080525
(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
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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)
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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...
13 - P1100798
Andrey Frolkin
Kostas Prentos

StrateGems 50 04-06/2010
2. ehrende Erwähnung, Good Companions Quick Composing Tourneys, 2010, Beweispartien
P1100798
(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
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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...
14 - P1106666
Mario Parrinello
Kostas Prentos

P0265 StrateGems 50 04-06/2010
3. Lob
P1106666
(13+14) C+
BP in 21,5
1. f3 Sc6 2. Kf2 Sd4 3. Kg3 Sxe2+ 4. Kg4 Sg3 5. hxg3 Tb8 6. Th6 Ta8 7. Tb6 axb6 8. De2 Ta5 9. Da6 Ta3 10. bxa3 h6 11. Lb2 Th7 12. Lf6 Th8 13. Sc3 Th7 14. Te1 Th8 15. Te6 dxe6 16. Sge2 Dd3 17. Sd4 Dh7 18. Se4 Kd7 19. Lb5+ Kd8 20. Le8 Ld7 21. c3 Lc8 22. Sc6+
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comment
Keywords: Unique Proof Game, Switchback (ttl), Tempo Loss
Genre: Retro
Computer test: C+ by Natch 3.1 (17 s) No solution in 20.5 Computerprüfung: C+ Stelvio 1.6 in 4 Min. Notation ist mit Henriks Änderung richtig!
FEN: 2bkBbnr/1pp1pppq/QpN1pB1p/8/4N1K1/P1P2PP1/P2P2P1/8
Input: Gerd Wilts, 2010-06-03
Last update: A.Buchanan, 2024-02-12 more...
15 - P1112884
Mario Parrinello
Kostas Prentos

1634 Mat Plus 37-38 08/2010
P1112884
(13+16) C+
BP in 20,0
1. Sa3 Sf6 2. Sc4 Sd5 3. Se5 Sb4 4. Sg6 fxg6 5. a4 Kf7 6. Ta3 Kf6 7. Tf3+ Kg5 8. Tf6 exf6 9. h3 Lc5 10. Th2 Te8 11. Th1 Te6 12. Th2 Ta6 13. Th1 b6 14. Th2 Lb7 15. Th1 Le4 16. Th2 c6 17. Th1 Dc7 18. Th2 Dxh2 19. g3 Dg2 20. f3 Lf2#
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comment
Keywords: Unique Proof Game, Pendulum (T x9), Tempo Loss
Genre: Retro
Computer test: C+ by Natch 3.1 (3 s) No solution in 19.0 Computerprüfung: C+ Stelvio 2.0 in 1 Sek.
FEN: rn6/p2p2pp/rpp2pp1/6k1/Pn2b3/5PPP/1PPPPbq1/2BQKBN1
Input: Gerd Wilts, 2010-08-14
Last update: A.Buchanan, 2024-02-12 more...
16 - P1114936
Andrey Frolkin
Kostas Prentos

769 Quartz 35 08/2010
P1114936
(13+13) C+
BP in 18,0
1. g3 a5 2. Lh3 a4 3. Kf1 a3 4. Kg2 axb2 5. Sa3 b1=S 6. Kf3 Sxd2+ 7. Kg4 Sc4 8. Dd3 Ta4 9. Dxh7 Sa6 10. Dxg8 Th6 11. Sf3 Tf6 12. Td1 g6 13. Td6 exd6 14. Tb1 Ke7 15. Tb3 Ke6 16. Te3+ Se5+ 17. Kg5+ Tg4+ 18. Lxg4+ Tf5+
play all play one stop play next play all
Henrik Juel: C+ by Natch 3.1 (2 m)
No solution in 17.0 (2018-12-29)
paul: For the record number of cross-checks, see P1348273. (2020-12-08)
A.Buchanan: Actually I think the record is now here P1360125... for now :-) (2020-12-09)
comment
Keywords: Unique Proof Game, Consecutive checks (6)
Genre: Retro
FEN: 2bq1bQ1/1ppp1p2/n2pk1p1/4nrK1/6B1/N3RNP1/P1P1PP1P/2B5
Input: Gerd Wilts, 2010-09-10
Last update: A.Buchanan, 2020-12-09 more...
17 - P1204066
Kostas Prentos
Alex Frolkin

WCCC Jesi 08/2011
1.-2.Preis Champagne-TT Abteilung A
P1204066
(13+11) C+
BP in 21.5
1. h4 c5 2. h5 c4 3. h6 c3 4. hxg7 cxb2 5. c4 h5 6. c5 h4 7. c6 h3 8. c7 h2 9. Sh3 Th4 10. Tg1 h1=S 11. cxd8=S Sg3 12. Sc6 Sxf1 13. Sxa7 Se3 14. Sxc8 Taa4 15. Sd6+ exd6 16. dxe3 Se7 17. Sd2 b1=L 18. g8=L Lh7 19. Dc2 Tae4 20. a4 f5 21. La2 Lg8 22. Lb1
play all play one stop play next play all
PR M.Caillaud: A SPG "of the future" : 2 Ceriani-Frolkin Knights and 2 Phenix Bishops exchanging their place after promotion. More original, but the weak point is that the Bishops are obviously promoted.
Henrik Juel: C+ by Natch 3.1 (13 s)
No solution in 21.0 (2018-12-29)
Kostas Prentos: The co-author is Andrey Frolkin (not Alex) (2022-12-08)
comment
Keywords: Unique Proof Game
Genre: Retro
Computer test: Stelvio 2.0, 6sec
FEN: 1n2kbb1/1p1pn3/3p4/5p2/P3r2r/4P2N/2QNPPP1/RBB1K1R1
Input: Mario Richter, 2011-10-07
Last update: Reto, 2023-12-20 more...
18 - P1207486
Kostas Prentos
WCCC Jurmala 08-09/2008
1. Preis
8th Japanese Sake Tourney
1. Platz Wenigsteiner-Jahrespreis 2008
P1207486
(2+2)
h#3 4. 1;1. 1;1. 1
transmutierende Könige
1. Tc1 Te7 2. Ta1+ Kh8 3. Tg1 Th7#
1. Tb3 Th8+ 2. Ka1 Th7 3. Tb1 Ta7#
1. Tc8+ Ka1 2. Tc2 Tb8 3. Th2 Tb1#
1. Tc7 Te1+ 2. Kh8 Tb1 3. Th7 Tb8#
play all play one stop play next play all
SCHRECKE: C+, popeye 4.87 (2021-06-30)
more ...
comment
Keywords: Transmuting Kings, Aristocrat, Minimal, Miniature
Genre: Fairies
FEN: K3R3/8/8/8/8/2r5/8/7k
Input: Hans Gruber, 2011-10-09
Last update: Marcin Banaszek, 2021-06-30 more...
19 - P1214071
Kostas Prentos
Andrey Frolkin

P0315 StrateGems 56 2011
7. ehrende Erwähnung
P1214071
(15+14) C+
BP in 20,0
b) Schwarz nimmt die Rochade zurück, dann BP in 19,5
a) 1. a4 h5 2. Ta3 h4 3. Tb3 Th5 4. Tb6 axb6 5. g4 Taa5 6. gxh5 Tg5 7. a5 e5 8. a6 Lc5 9. a7 d6 10. a8=T Lg4 11. Ta1 Lf3 12. exf3 e4 13. La6 e3 14. d3 e2 15. Lf4 Kf8 16. Kd2 e1=T 17. Sa3 Te8 18. De2 Se7 19. Td1 Kg8 20. Kc1 Tf8
b) 1. a4 h5 2. Ta3 h4 3. Tb3 Th5 4. Tb6 axb6 5. g4 Taa5 6. gxh5 Tg5 7. a5 e5 8. a6 Lc5 9. a7 d6 10. a8=T Lg4 11. Ta1 Lf3 12. exf3 e4 13. La6 e3 14. d3 e2 15. Lf4 Se7 16. Kd2 e1=T 17. Sa3 Te6 18. De2 Th6 19. Td1 Th8 20. Kc1
play all play one stop play next play all
Moldenhauer: Computerprüfung: a) C+ Stelvio 1.0 72 Sekunden.
Keine Lösung: BP 19.0, BP 19.5. (2023-03-02)
Moldenhauer: Computerprüfung: b) C+ Stelvio 1.0 61 Sekunden.
Keine Lösung: BP 18.5, BP 19.0.
FEN b): 1n1qk2r/1pp1npp1/Bp1p4/2b3rP/5B1p/N2P1P2/1PP1QP1P/2KR2NR (2023-03-02)
more ...
comment
Keywords: Unique Proof Game
Genre: Retro
Computer test: Stelvio 1.0
FEN: 1n1q1rk1/1pp1npp1/Bp1p4/2b3rP/5B1p/N2P1P2/1PP1QP1P/2KR2NR
Input: Gerd Wilts, 2011-10-15
Last update: Silvio Baier, 2023-11-14 more...
20 - P1339644
Kostas Prentos
10 Belgrade Sake Tourney 2016
1st Prize
P1339644
(8+0)
h#2
b) Tb1 nach d1
Colorless chess
a) 1. Tb7 L7b6 2. Sd7 cxb7#
b) 1. Lb8 c7 2. Td7 cxb8=D#
1. Kxc7? Se6+ 2. Kc8 Td8+ 3. Lxd8!
play all play one stop play next play all
a) The four pieces which move reveal their colours. So with 2. ... cxb7# delivers check to bK, whichever it turns it to be! All other flight squares are covered by wK, wLb6 & if necessary sSd7.
b) Now wK, wDb8 & (if necessary) sTd7 cover the flight squares.
A.Buchanan: Amazing that this idea can be implemented so cleanly. (2017-09-18)
paul: a)1.Rb7 B7b6 2.Sd7 cxb7#
b)1.Bb8 c7 2.Rd7 cxb8=Q#
1.Kxc7? Se6+ 2.Kc8 Rd8+ 3.Bxd8!
The two Kings' colors are not revealed in either phase. (2021-05-18)
A.Buchanan: What are the roles of La5 & Ba4?
Has this been proved sound? (Could run 128 h#2, then compare versions which allowed the same mate to see if all versions of unspecified piece support the mate.) (2021-05-18)
comment
Keywords: Colorless chess
Genre: Retro, Fairies, h#
FEN: K1K5/2B5/2P5/B1N5/P7/8/8/1R6
Reprints: 10 Problem Paradise 74, p. 44, 04-06/2016
B64 Phénix 275-276, p. 10838, 07-08/2017
Input: A.Buchanan, 2017-09-18
Last update: A.Buchanan, 2021-05-18 more...
21 - P1339695
Kostas Prentos
09 Belgrade Sake Tourney 2016
2. ehrende Erwähnung
P1339695
(6+0)
h#2
2 Lösungen
Colorless chess
Kostas Prentos: Solution:
1. Le7(=b) Kh5(=w, bKa4, wTb5, wLe8) 2. La3 Sb6(=w)#
1. Lg3(=b) Se3(=w) 2. Kh4(=b, wKa4) Th5(=w, wLe8)# (2022-12-08)
comment
Keywords: Colorless chess, Aristocrat
Genre: h#, Retro, Fairies
FEN: 4B3/8/8/1R6/K1N3KB/8/8/8
Reprints: 09 Problem Paradise 74, p. 47, 04-06/2016
Input: A.Buchanan, 2017-09-18
Last update: Alfred Pfeiffer, 2017-09-19 more...
22 - P1339698
Kostas Prentos
05 Belgrade Sake Tourney 2016
3. ehrende Erwähnung
P1339698
(9+0)
h#2
b) La2 nach e2
Colorless Chess
Kostas Prentos: Solution:
a) 1. cxd3 e.p.(=b) Tf6(=w) 2. Ld5(=b) Tf4(bKe4, wKg5, wLc1, wSf3)#
b) 1. dxc3 e.p.(=b) Ta4(=w) 2. Kd3(=b; bLe2, wKg5, wLc1, wSf3) Se1# (2022-12-08)
comment
Keywords: Colorless chess
Genre: h#, Retro, Fairies
FEN: 8/8/R7/2P3K1/2PPK3/5N2/B7/2B5
Reprints: 05 Problem Paradise 74, p. 47, 04-06/2016
Input: A.Buchanan, 2017-09-18
Last update: Alfred Pfeiffer, 2017-09-19 more...
23 - P1339707
Kostas Prentos
04 Belgrade Sake Tourney 2016
Lob
P1339707
(10+0)
h#2
Colorless chess
b) Bd3 nach b3
Kostas Prentos: Solution:
a) 1. fxe3 e.p,(=b) 0-0(wKg1, wTf1, wTa1, wTf5, bKd4) 2. Ke4 (bPd3) Ta4#
b) 1. Ke5(=b, bTf5, bPf4, wKe1, wTa1, wTh1) 0-0-0(wLh5) 2. Kxe4 The1# (2022-12-08)
comment
Keywords: Colorless chess
Genre: h#, Retro, Fairies
FEN: 8/8/8/5RPB/3KPP2/3P4/8/R3K2R
Reprints: 04 Problem Paradise 74, p. 49, 04-06/2016
Input: A.Buchanan, 2017-09-18
Last update: Alfred Pfeiffer, 2019-06-03 more...
24 - P1357876
Kostas Prentos
Andrey Frolkin

P0462v StrateGems 84 10-12/2018
P1357876
(13+11)
KBP 18.5
Provokateure
'Quartz' (P. Raican): "The proof game is a correction of one published in Problemaz, December 2008, which was the last issue of this interesting chess magazine, edited by Abdelaziz Onkoud. The authors recently demolished the original problem with Jacobi. Lecturers are invited to solve this PG, even with the help of Labelle's program. After 10 years, the cook-hunters are now able to verify, even partially, the problems collected in this article, using the remarkable program Jacobi."
(mri: A small remark: 10 years ago it was already possible to "verify, even partially" at least some of the "Provocateur" PGs using 'rawbats').
Kostas Prentos: Solution:
1. h4 a5 2. h5 a4 3. h6 a3 4. hxg7 axb2 5. Th6 Ta3 6. Te6 Td3 7. a4 h5 8. a5 h4 9. Ta4 h3 10. Sa3 b1=D 11. Lb2 h2 12. Le5 hxg1=D 13. Lh2 Thh3 14. gxh3 f6 15. Lxg1 Kf7 16. Lg2 Kg6 17. Lc6 bxc6 18. cxd3 Lb7 19. Dxb1
C+ Jacobi v0.4.8 (711046 sec) (2022-12-08)
comment
Keywords: Unique Proof Game, Provocateurs
Genre: Retro, Fairies
FEN: 1n1q1bn1/1bppp1P1/2p1Rpk1/P7/R7/N2P3P/3PPP2/1Q2K1B1
Reprints: P11 Quartz 46, p. 792, 10/2018
Input: Mario Richter, 2018-11-20
Last update: Marcin Banaszek, 2019-08-07 more...
25 - P1381407
Kostas Prentos
Gravure 2020
1. Lob
P1381407
(8+2) C+
s#9
b) Df8 nach c1
a) 1. Df3! Kc5 2. Sa2 Kxb5 3. Ld4 Ka5 4. Da8+ Kb5 5. Sc3+ Kb4 6. Te1 Kxb3 7. Da4+ Kb2 8. Se2+ Kb1 9. Dc2+ dxc2#

b) 1. b4! Kc4 2. Te4+ Kb3 3. Sb1 Ka2,Ka4 4. Sa3 Kb3 5. Da1 Ka4 6. Kc1 Kb3 7. Kb1 Ka4 8. Lc1 Kb3 9. Sc2 dxc2#
play all play one stop play next play all
more ...
comment

Genre: s#
Computer test: Gustav 4.1d, Brute Force
FEN: 5Q2/8/4R3/1P6/3k4/1PNp4/1B1P4/3K4
Input: Olaf Jenkner, 2020-10-31
Last update: Alfred Pfeiffer, 2020-11-03 more...
26 - P1383299
Ioannis Kalkavouras
Kostas Prentos

18213 Die Schwalbe 303 06/2020
1. ehrende Erwähnung
Abt. h#3,5-n
PR Fadil Abdurahmanovic
P1383299
(2+10) C+
h#6v
1. Kc5? Lc7 2. d5 Lxe5 3. Lb6 Lb8 4. De6 La7 5. Kd6 ??
1. Ke6 Lc7 2. d5 Lxe5 3. Lb6 Lc7 4. Lc5 Lb6 5. Kd6 La7 6. De6 Lb8#
play all play one stop play next play all
more ...
comment
Keywords: Minimal (L), Tempo Loss, Remote selfblock, Selfblock, Klasinc theme (L-l), Umnov, interchange in mating position (k-b), Round Trip (L-4+2), Switchback (Lk)
Genre: h#
Computer test: M. Schreckenbach: Gustav 4.1 d
FEN: 1B1b4/3pn3/2pp4/3kp3/8/4q1pp/8/7K
Input: Gerd Wilts, 2020-12-23
Last update: Olaf Jenkner, 2023-10-15 more...
27 - P1384486
Kostas Prentos
Andrey Frolkin

Problemaz 2007
4. Preis
P1384486
(14+14)
BP 17.5
Kostas Prentos: Solution:
1. g4 a5 2. g5 a4 3. g6 a3 4. gxh7 axb2 5. a4 bxa1=L 6. a5 Ld4 7. Lb2 La7 8. Lf6 b6 9. Lh4 Sf6 10. a6 Tg8 11. h8=T Lb7 12. Th5 Le4 13. Ta5 Lh7 14. e4 g6 15. Le2 Lg7 16. Lh5 Sg4 17. Ke2 La1 18. Txa1 (C+) (2022-12-08)
comment

Genre: Retro
FEN: rn1qk1r1/b1pppp1b/Pp4p1/7B/4P1nB/8/2PPKP1P/RN1Q2NR
Input: fs/hg, 2020-12-30
Last update: Gerd Wilts, 2020-12-30 more...
28 - P1384516
Kostas Prentos
WCCC Vilnius 08/2019
4. Preis
Murfatlar-Thematurnier
P1384516
(12+13) C+
BP 15.5
Duellantenschach
1. g4 g6 2. g5 c5 3. c3 c4 4. h4 h5 5. gxh6 e.p. Lg7 6. hxg7 Sh6 7. g8=S Sf5 8. Sf6+ exf6 9. f4 d5 10. d4 cxd3 ep 11. Dc2 dxc2 12. Le3 cxb1=S 13. Lb6 Sd2 14. La5 Sf3+ 15. exf3 0-0 16. 0-0-0
play all play one stop play next play all
Kostas Prentos: Solution:
1. g4 g6 2. g5 c5 3. c3 c4 4. h4 h5 5. gxh6 e.p. Lg7 6. hxg7 Sh6 7. g8=S Sf5 8. Sf6+ exf6 9. f4 d5 10. d4 cxd3 e.p. 11. Dc2 dxc2 12. Le3 cxb1=S 13. Lb6 Sd2 14. La5 Sf3+ 15. exf3 0-0 16. 0-0-0
C+ Jacobi v0.6.4 (5757 sec) (2022-12-08)
comment
Keywords: Unique Proof Game, Single Combat
Genre: Retro, Fairies
FEN: rnbq1rk1/pp3p2/5pp1/B2p1n2/5P1P/2P2P2/PP6/2KR1BNR
Input: fs/hg, 2020-12-30
Last update: Marcin Banaszek, 2023-09-29 more...
29 - P1384517
Kostas Prentos
WCCC Vilnius 08/2019
5. Preis
Murfatlar-Thematurnier
P1384517
(11+11)
BP 24.5
Duellantenschach
1. a4 g5 2. a5 g4 3. a6 g3 4. axb7 gxh2 5. bxc8=S hxg1=S 6. Sd6+ cxd6 7. Ta4 d5 8. Td4 Sf3+ 9. gxf3 f5 10. f4 h5 11. c4 h4 12. c5 h3 13. c6 h2 14. c7 Th3 15. c8=S Tg3 16. Sd6+ exd6 17. Tg1 hxg1=S 18. Lh3 Sf3+ 19. exf3 a5 20. Ke2 a4 21. Kd3 a3 22. Kc3 a2 23. Kb4 a1=S 24. Kb5 Sc2 25. Dxc2
play all play one stop play next play all
Kostas Prentos: Solution:
1. a4 g5 2. a5 g4 3. a6 g3 4. axb7 gxh2 5. bxc8=S hxg1=S 6. Sd6+ cxd6 7. Ta4 d5 8. Td4 Sf3+ 9. gxf3 f5 10. f4 h5 11. c4 h4 12. c5 h3 13. c6 h2 14. c7 Th3 15. c8=S Tg3 16. Sd6+ exd6 17. Tg1 hxg1=S 18. Lh3 Sf3+ 19. exf3 a5 20. Ke2 a4 21. Kd3 a3 22. Kc3 a2 23. Kb4 a1=S 24. Kb5 Sc2 25. Dxc2 (2022-12-08)
comment
Keywords: Single Combat, Unique Proof Game
Genre: Retro, Fairies
FEN: rn1qkbn1/3p4/3p4/1K1p1p2/3R1P2/5PrB/1PQP1P2/1NB5
Input: fs/hg, 2020-12-30
Last update: Marcin Banaszek, 2023-09-29 more...
30 - P1384613
Kostas Prentos

Superpreis ex aequo
Murfatlar-Turnier
P1384613
(14+14) C+
BP 15.5
Madrasi
LaTeX-import:
Source not uniquely identified: 61. WCCC
Kostas Prentos: 1st Murfatlat TT, Ohrid WCCC, 2018.
Solution:
1. BPec4 BPbd5 2. BPb5 BPa5 3. BPbxb6 e.p. Lb7 4. BPc7 Dc8 5. BPd8=S BPe4 6. Se6 BPexe6 7. Lb5 Lb4 8. Se2 Se7 9. 0-0 0-0 10. BPdf4 BPexe3 e.p. 11. BPh4 BPf2 12. Le3 Lf3 13. Sc1 Le2 14. Kh1 BPg1=S 15. Tf2 Sh3 16. BPhxh3 (2022-12-08)
comment
Keywords: Madrasi, Berolina chess
Pieces: bu = Berolina Pawn (BE)
Genre: Retro, Fairies
FEN: rnq2rk1/*2p2*2pn*2p*2p*2p/4*2p3/1B6/1b5*2P/4B2*2P/*2P*2P*2P1bR*2P1/RNNQ3K
Input: fs/hg, 2020-12-30
Last update: A.Buchanan, 2022-09-13 more...
31 - P1384627
Kostas Prentos
StrateGems 2017
3. Preis
P1384627
(14+15) C+
KBP 22.5
1. b3 Sf6 2. Lb2 Sh5 3. Lf6 gxf6 4. Dc1 Lh6 5. Da3 Lf4 6. Da6 bxa6 7. g4 Lb7 8. g5 Lf3 9. g6 c6 10. g7 Da5 11. gxh8=L Df5 12. Lg7 a5 13. Lh6 Sa6 14. Lg5 0-0-0 15. Lh4 Tg8 16. Lg3 Tg5 17. h4 Sg7 18. Th2 Lh5 19. f3 Kc7 20. Lf2 Kd6 21. Ld4 Sc7 22. Lb2 a6 23. Lc1
play all play one stop play next play all
Vladimir Rey: 1. b3 Sf6 2. Lb2 Sh5 3. Lf6 gxf6 4. Dc1 Lh6 5. Da3 Lf4 6. Da6 bxa6 7. g4 Lb7 8. g5 Lf3 9. g6 c6 10. g7 Da5 11. gxh8=L Df5 12. Lg7 a5 13. Lh6 Sa6 14. Lg5 0-0-0 15. Lh4 Tg8 16. Lg3 Tg5 17. h4 Sg7 18. Th2 Lh5 19. f3 Kc7 20. Lf2 Kd6 21. Ld4 Sc7 22. Lb2 a6 23. Lc1 (2022-07-30)
Henrik Juel: Pronkin theme: [Lc1] is captured on f6, and Lc1 is [Pg2] promoted on h8
The march from h8 to c1 is arduous: g7xTh8=L-g7-h6-g5-h4-g3-f2-d4-b2-c1, with nine moves by promoted L (2022-07-30)
more ...
comment
Keywords: Unique Proof Game, Pronkin Theme (L)
Genre: Retro
Computer test: Computerprüfung: C+ Stevio 1.0 00:01:30 Minute. (hh:mm:ss) Keine Lösung: BP 21.5, BP 22.0.
FEN: 8/2npppnp/p1pk1p2/p4qrb/5b1P/1P3P2/P1PPP2R/RNB1KBN1
Input: fs/hg, 2020-12-30
Last update: A.Buchanan, 2023-03-10 more...
32 - P1384694
Kostas Prentos

1. ehrende Erwähnung
Champagnerturnier, Abt. A
P1384694
(14+13)
BP 17.5
LaTeX-import:
Source not uniquely identified: 53. WCCC Hersonnisos
Kostas Prentos: Champagne, Crete WCCC 2010
Solution:
1. Sc3 Sf6 2. Se4 Sd5 3. Sg5 Sc3 4. Sxh7 Sb1 5. c3 a5 6. Db3 Ta6 7. Dxb7 Tb6 8. Df3 Txb2 9. Dh3 Tc2 10. La3 Lb7 11. Lxe7 Lxg2 12. Lc5 Lf3 13. La7 Lh5 14. f3 Ke7 15. Kf2 Kd6 16. Ke3 Ke5 17. Kd3 Kf4 18. Kc4 (2022-12-08)
Moldenhauer: Computerprüfung: C+ Stelvio 1.6 in 1 Sek.
Keine Lösung: BP 17.0. Notation OK! (2023-12-16)
comment

Genre: Retro
FEN: 1n1q1b1r/B1pp1ppN/8/p6b/2K2k2/2P2P1Q/P1rPP2P/Rn3BNR
Input: fs/hg, 2020-12-30
Last update: fs/hg, 2020-12-30 more...
33 - P1384700
Kostas Prentos
WCCC 2017
2. Preis
Champagner TT, Abteilung A
P1384700
(11+16) C+
BP 21
Kostas Prentos: Solution:
1. Sc3 d5 2. Se4 Lf5 3. Sf6+ exf6 4. e4 Dc8 5. e5 Le4 6. e6 f5 7. e7 Kd7 8. e8=S Se7 9. Sf6+ gxf6 10. g4 Lh6 11. g5 Te8 12. g6 Lg5 13. g7 Sg6 14. g8=T Te5 15. Td8+ Ke7 16. Td6 De6 17. Tb6 axb6 18. Lb5 Txa2 19. Lc6 Ta7 20. Ta6 b5 21. Tb6 cxb6 (2022-12-08)
comment

Genre: Retro
FEN: 1n6/rp2kp1p/1pB1qpn1/1p1prpb1/4b3/8/1PPP1P1P/2BQK1NR
Input: fs/hg, 2020-12-30
Last update: fs/hg, 2020-12-30 more...
34 - P1384724
Andrey Frolkin
Kostas Prentos

Phénix 2009
2. Preis
P1384724
(15+13) C+
a) H#1.5
b) BP 15, dann H#1.5
Kostas Prentos: Solution:
a) h#1,5: 1…Dd4 2. 0-0 Dxg7#
b) 1. h4 b6 2. Th3 La6 3. Tf3 Lc4 4. Txf7 Sa6 5. Txf8+ Kxf8 6. h5 De8 7. h6 Dh5 8. d4 Kf7 9. Sd2 Tf8 10. Sdf3 Ke8 11. Sh2 Tf3 12. exf3 Sf6 13. Le2 Sd5 14. Kf1 Sdb4 15. d5 c5 & h#1.5: 1…dxc6 e.p. 2. Kd8 Dxd7# (2022-12-08)
comment

Genre: Retro
FEN: 4k2r/p2pp1pp/np5P/2pP3q/1nb5/5P2/PPP1BPPN/R1BQ1KN1
Input: fs/hg, 2020-12-30
Last update: Gerd Wilts, 2020-12-30 more...
35 - P1384743
Kostas Prentos
Andrey Frolkin

Phénix 2014
2. Preis
Dupont 50 JT
P1384743
(13+13) C+
BP in 28.5
1. d4 e5 2. d5 e4 3. d6 e3 4. dxc7 exf2+ 5. Kd2 d5 6. e4 Ld7 7. c8=S d4 8. Sb6 axb6 9. e5 Ta3 10. e6 Te3 11. a4 d3 12. Kc3 d2+ 13. Ld3 f1=S 14. a5 Sg3 15. hxg3 h5 16. Th4 Sh6 17. Tg4 h4 18. a6 h3 19. Ta5 h2 20. Th5 g5 21. a7 Lg7+ 22. Kb4 Kf8 23. c3 Kg8 24. Dc2 d1=S 25. e7 Sf2 26. e8=S Sh3 27. Sc7 Le8 28. Sa6 bxa6 29. gxh3
play all play one stop play next play all
A.Buchanan: Not really C+ unless we test 27.0 too. (2023-05-29)
Henrik Juel: To achieve 'really C+' we must test 26.5, 26.0, .. , 1.0, 0.5 also, which seems ridiculous
Or maybe we could use a dumb solver like Popeye or Jacobi, which is too slow
Smart solvers like Stelvio test exact stipulations like 'BP in exactly 28.5' only, so for practical purposes it is necessary to test a few shorter lengths also
But just a few should suffice... (2023-05-30)
A.Buchanan: If there is a solution in x.y then there is a solution in (x+2).y. This is because any PG could be prefixed by eg 1.Sa3 Sa6 2.Sb1 Sb8. So we only need to check 4 cases. But for some reason we are only checking 3 cases. Yes it’s unlikely that there is a cook, but on the other hand it is quick to check. If you only want to check 3 fine, but it’s not C+ (2023-05-30)
A.Buchanan: Eg: P0008846 (2023-05-30)
Moldenhauer: Hi, Andrew und Henrik. Diesen Text habe ich aus dem Problem P0007036 kopiert.
ras@bsiag.com: Well, Stelvio treats shorter solutions of same parity as cooks, so any shorter solution in 16.5, 15.5 etc would have been found by checking for 17.5. Außerdem gibt es eine Dokumentation der
Stelviofähigkeiten und Anzeigen am Bildschirm.
Nach diesem Text muss ich bei einer Beweispartie mit 28.5 nur die Tests für 28.0 und 27.0 machen.
Die anderen Tests 28.5, 27.5 26.5 usw. erledigt Stelvio. Seit Ihr damit einverstanden?
Ergänzung zu dieser Beweispartie: Stelvio 1.2 keine Lösung auch bei BP 26.5, BP 26.0.
Hinweis: Der Test für BP 28.0 dauerte 19 Std. 35 Min.. (2023-05-31)
A.Buchanan: If there were lots of solutions at x.y, would stelvio still continue to look at (x+1).y, where there may be a single solution? (2023-06-01)
Reto: Hi all, you only need to check 28.5 and 28.0, as Stelvio always finds solutions/cooks with same move parity but less moves, so with 28.0, you also find 27.0, 26.0, ... and with 28.5 you find 27.5, 26.5, ... (2023-06-01)
Henrik Juel: Thanks for putting the record straight, Reto
I believe that Natch and Euclide only test the exact stipulation, but now I am not sure
Does anybody know the truth about Natch and Euclide? (2023-06-01)
more ...
comment

Genre: Retro
Computer test: Computerprüfung: C+ Stelvio 1.2 30:19:00 Stunden. (hh:mm:ss) Keine Lösung: BP 27.5, BP 28.0. Ergänzung: Stelvio 1.2 findet keine Lösung BP 27.0 nach ca. 5 Std.
FEN: 1n1qb1kr/P4pb1/pp5n/6pR/1K4R1/2PBr1PP/1PQ4p/1NB3N1
Input: fs/hg, 2020-12-30
Last update: A.Buchanan, 2023-05-30 more...
36 - P1404784
Kostas Prentos
P0081 StrateGems 14 04-06/2001
P1404784
(8+15)
BP in 20,0
1. g4 Sh6 2. g5 Sf5 3. g6 hxg6 4. d4 Th3 5. Lh6 Tb3 6. axb3 gxh6 7. Ta6 Sg7 8. Tb6 axb6 9. e4 Ta1 10. La6 bxa6 11. f4 Lb7 12. f5 La8 13. f6 exf6 14. d5 La3 15. d6 cxd6 16. c4 Dc7 17. c5 Da7 18. c6 dxc6 19. e5 Kd7 20. e6 fxe6
play all play one stop play next play all
Moldenhauer: Computerprüfung: C+ Natch 3.3 in 12 Sek. und keine Lösung BP 19 in 8 Sek. (2023-01-23)
Henrik Juel: Thanks for your testing of proof games, Moldenhauer
For completeness: no solution in 19.5 moves (7 seconds), either (2023-01-23)
comment

Genre: Retro
FEN: bn6/q2k2n1/pppppppp/8/8/bP6/1P5P/rN1QK1NR
Input: Vladimir Rey, 2022-10-01
Last update: Vladimir Rey, 2022-10-01 more...
37 - P1405529
Antonio Tarnawiecki
Kostas Prentos

C11981 The Problemist 28-8, p. 316, 03/2022
P1405529
(13+10)
#3
1. Tc6!
play all play one stop play next play all
Henrik Juel: C+ Popeye 4.61 (2022-11-02)
Henrik Juel: 1.Tc6 thr. 2.Tc5+ Kd4 3.De3#
1... Ld4,Lxb4/Kd4 2.De5/De3+
1... Te5/De5 2.Sf4/Se7+ (2022-11-02)
comment

Genre: 3#
FEN: 2N1b3/2pB2q1/R2PP3/1P1k1rnN/1P6/p1bP1p2/1BK2P2/1n2Q3
Input: Felber, Volker, 2022-11-02
Last update: Felber, Volker, 2022-11-02 more...
38 - P1406351
Theodoros Giakatis
Kostas Prentos
Themis Argirakopoulos

WCCC Fujairah 19/11/2022
Commendation
20th Romanian Tzuica Tourney
P1406351
(8+9) C+
HS#3
Anticirce
b) -wBh5
1. Dd8 Txc7 (+sTh8) 2. Lxh8 (+wLc1) Dc5 3. Da5+ Dxa5 (+sDd8)#
1. Dh8 Dxe5 (+sDd8) 2. Lxd8 (+wLc1) Tc4 3. Dc3+ Txc3 (+sTh8)#
play all play one stop play next play all
Henrik Juel: tiny typo in twinning: -wBh5, not -s (2022-12-01)
Hiroaki Maeshima: Thank you - I have corrected it! (2022-12-03)
more ...
comment
Keywords: Circe (Anticirce)
Genre: Fairies
Computer test: C+ Popeye 4.61
FEN: 4Q3/1pPP4/p3bB2/q3P2P/1R3b1K/k1r5/pn6/8
Input: Hiroaki Maeshima, 2022-12-01
Last update: A.Buchanan, 2022-12-04 more...
39 - P1408920
Kevin James Begley
Kostas Prentos

19138 Die Schwalbe 317 2022/10
P1408920
(16+16)
BP in 12,5

Kontraparraincirce
1. d4 a5 2. Dd3 Ta6 3. Dxh7 Th6[+sBa7] 4. a4 Th3 5. Sa3 Txa3 6. Dh4[+wSa6] bxa6 7. Dxh8[+wSa2] Th3[+sTa8] 8. Dxg8 Th8[+sSg3] 9. Le3 Sxf1 10. Td1[+sLc1] Sxe3 11. Sf3[+wLf1] Sc4 12. Sd2 Sxb2 13. Sb1[+wBd3]
play all play one stop play next play all
Kevin Begley: Five Siblings (2023-04-17)
comment
Keywords: Unique Proof Game, Circe (Kontraparrain), Impostor (ttLLS)
Genre: Retro, Fairies
FEN: rnbqkbQr/p1ppppp1/p7/p7/P2P4/3P4/NnP1PPPP/1NBRKB1R
Input: Kevin Begley, 2023-04-16
Last update: Kevin Begley, 2023-08-22 more...
40 - P1411896
Kostas Prentos
Kevin James Begley

3073 Problemskak 61, p. 17, 01/2023
P1411896
(16+13) C+
BP in 9,5

Einsteinschach
1.d3 h6 2.Lxh6=T c6 3.Txc6=D Th6=L 4.g3 Lc1=S 5.e3 f6 6.Le2=S Kf7 7.Sxc1=L Kg6 8.Se2=B Kh7 9.0-0[f1=T] Kh8 10.Dh1=T

Cyclic Platzwechsel (Rh1 to f1=B, Lf1 to c1=B, Lc1 to h1=R).
play all play one stop play next play all
more ...
comment
Keywords: Unique Proof Game, Einstein Chess, Impostor (LLT)
Genre: Retro, Fairies
FEN: rnbq1bnk/pp1pp1p1/5p2/8/8/3PP1P1/PPP1PP1P/RNBQ1BKR
Input: Kevin Begley, 2023-08-22
Last update: Kevin Begley, 2023-08-22 more...
41 - P1412601
Kostas Prentos
WCCC Batumi 2023-09
20th Japanese Sake Tourney
Commendation
P1412601
(7+9)
H#2 Series Capture
b) Kb6 > a3
a) 1.Bd6 (1.Bxe5-d6?) Bxb5xa4-b3 2.Kxf4xe5-d5 Rxe4#
b) 1.Rd4 (1.Rxd3-d4?) Rxa4xa8xb8-c8 2.Kxe2xd3-c4 Bxe4#
play all play one stop play next play all
SCHRECKE: a)+b): C+, popeye 4.89 (2023-10-05)
comment

Genre: Fairies
FEN: rb1r4/8/1KB3n1/1p2P1n1/p1R1pP2/3Pk3/4P3/8
Input: Hiroaki Maeshima, 2023-09-30
Last update: Hiroaki Maeshima, 2023-09-30 more...
42 - P1412602
Kostas Prentos
WCCC Batumi 2023-09
20th Japanese Sake Tourney
Commendation
P1412602
(6+4)
H#2 Series Capture
2 solutions
1.Bxe5-c3 Rxg5-a5 2.Rxd6-d4 Se5#
1.Rxd6-d3 Bxg5-d2 2.Bxe5-d4 Sd6#
play all play one stop play next play all
SCHRECKE: C+, popeye 4.89 (2023-10-05)
comment

Genre: Fairies
FEN: 8/4BN2/3P4/4P1pR/2k5/8/K7/b2r4
Input: Hiroaki Maeshima, 2023-09-30
Last update: Hiroaki Maeshima, 2023-09-30 more...
43 - P1412605
Themis Argirakopoulos
Kostas Prentos

WCCC Batumi 2023-09
20th Japanese Sake Tourney
Commendation
P1412605
(8+7)
H#2 Series Capture
b) Kh4 > a3
c) Kh4 > h8
d) Pa2 > d4
a) 1.d1=R d8=R 2.Rxd6-d1 Rxd1-h1#
b) 1.d1=Q d8=Q 2.Qxb3-b8 Qxb8-b4#
c) 1.d1=B d8=B 2.Bxb3-g8 Bf6#
d) 1.d1=S d8=S 2.Sxf2-h3 Sxc6xd4-f5#
play all play one stop play next play all
SCHRECKE: a)-d): C+, popeye 4.89 (2023-10-05)
comment
Keywords: Kindergarten Problem
Genre: Fairies
FEN: 8/2KP3p/2pP3p/7p/5P1k/1PP2P2/p2p1P2/8
Input: Hiroaki Maeshima, 2023-09-30
Last update: Gunter Jordan, 2023-09-30 more...
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