Complex Puzzle

Discussion of anything and everything relating to chess playing software and machines.

Moderator: Ras

peter
Posts: 3393
Joined: Sat Feb 16, 2008 7:38 am
Full name: Peter Martan

Re: Complex Puzzle (first is draw)

Post by peter »

Didn't find the position in YACPD.
Added some more variants and comments to my .pgn.
Like the study more and more, thanks for finding and bringing, dear Jon!

[Event "Study CCC, source?"]
[Site "?"]
[Date "????.??.??"]
[Round "?"]
[White "Rossi, P.."]
[Black "?"]
[Result "1-0"]
[Annotator "Martan,Peter"]
[SetUp "1"]
[FEN "8/p5pp/P1P1p1k1/P3P1p1/6p1/P5P1/6Pr/5K2 w - - 0 0"]
[PlyCount "53"]

1. Kg1 Rh6 (1... Kh5 2. c7 h6 3. c8=N g6 4. Nb6 axb6 5. a7 bxa5 6. a8=Q a4 7.
Qd5 Rh4 8. gxh4 exd5 9. e6 gxh4 10. e7 Kg5 11. e8=Q Kf5 12. Qxa4 h3 13. gxh3
gxh3 14. Qd7+ Ke5 15. Qxh3 Kd4 16. a4 Kc4 17. a5 Kb5 18. Qa3 Kc4 19. a6 Kd4 20.
a7 Ke4 21. a8=Q g5 22. Qd6 Kf3 23. Qaxd5+ Kg4 24. Qg2+ Kf5 25. Qf3#) 2. c7 Kh5
3. c8=N (3. c8=Q $2 g6 4. a4 {stalemate}) 3... Kg6 (3... g6 $6 {"solution
variant"} 4. Nb6 axb6 5. a7 bxa5 6. a8=Q a4 7. Qd5 exd5 8. e6 d4 9. e7 d3 10.
e8=N d2 11. Nf6#) 4. a4 (4. Ne7+ $2 Kf7 5. Nc6 Ke8 6. Nxa7 Kd8 7. Nc6+ Kc7 8.
Nd8 Kb8 9. Nc6+ Kc8 10. Nd8 Kb8 11. Nc6+ Kc7 12. Nd8 Kb8 {3fold}) (4. Nxa7 $2
Kh5 5. a4 (5. Nc6 g6 6. a7 {stalemate}) 5... g6 6. Nb5 {stalemate}) 4... Kh5 (
4... Kf5 5. Nxa7 Kxe5 6. Nc6+ Kd6 7. a7 Rf6 8. a8=Q h5 9. a6 Rf7 10. Qb8+ Kc5
11. Qe5+ Kc4 12. Qxe6+ Kc3 13. Qxf7 h4 14. a7 h3 15. a8=Q h2+ 16. Kxh2 Kb2 17.
Qf2+ Kc3 18. Qd4+ Kc2 19. Qb7 g6 20. Qbb2#) (4... Kf7 5. Nxa7 Rg6 6. Nb5 Rf6 7.
exf6 Kxf6 8. a7 Ke5 9. a8=Q h5 10. a6 h4 11. a7 h3 12. Qb8+ Kf6 13. a8=Q h2+
14. Kxh2 Kf5 15. Qf8+ Kg6 16. Qae8+ Kh7 17. Qh8#) 5. Ne7 Rg6 (5... g6 6. Nd5
exd5 7. e6 d4 8. e7 d3 9. e8=N d2 10. Ng7#) 6. Kf2 Kh6 7. Ke3 Kh5 8. Kd4 Rh6 9.
Kc5 Rf6 10. exf6 gxf6 11. Nc8 f5 12. Nxa7 f4 13. Kd4 f3 14. Ke3 fxg2 15. Kf2 e5
16. Nb5 e4 17. a7 e3+ 18. Kxg2 e2 19. Kf2 e1=B+ 20. Kxe1 Kh6 21. a8=Q Kg7 22.
Qe4 Kf6 23. a6 Kg7 24. a7 h5 25. a8=Q h4 26. Qa7+ Kf6 27. Qae7# 1-0
Peter.
MikeGL
Posts: 1010
Joined: Thu Sep 01, 2011 2:49 pm

Re: Complex Puzzle

Post by MikeGL »

yes white wins by checkmate but only if white marches his K correctly : )
8/p5pp/P1P1p1k1/P3P1p1/6p1/P5P1/6Pr/5K2 w - - 0 0

:lol: :lol:
User avatar
Nordlandia
Posts: 2822
Joined: Fri Sep 25, 2015 9:38 pm
Location: Sortland, Norway

Re: Complex Puzzle

Post by Nordlandia »

Is it horizon effect that cause Stockfish not being certain e.g switching back and fourth between 123+ and 0 few times before settle final conclusion.
MikeGL
Posts: 1010
Joined: Thu Sep 01, 2011 2:49 pm

Re: Complex Puzzle (first is draw)

Post by MikeGL »

Nordlandia wrote:[d]8/3p3p/1n1p4/1B4k1/p2p2pN/P2P4/3P1P1p/R3K3 w Q - 0 0

Image
What's the winning line for white on this position?
Seems white is lost on all variations.

Scratching my head regards,
MikeGL
Posts: 1010
Joined: Thu Sep 01, 2011 2:49 pm

Re: Complex Puzzle (first is draw)

Post by MikeGL »

MikeGL wrote:
Nordlandia wrote:[d]8/3p3p/1n1p4/1B4k1/p2p2pN/P2P4/3P1P1p/R3K3 w Q - 0 0

Image
What's the winning line for white on this position?
Seems white is lost on all variations.

Scratching my head regards,
Edit: Found a forced drawing line for white, but I can't find the winning line as claimed by the composer of this study.

User avatar
Nordlandia
Posts: 2822
Joined: Fri Sep 25, 2015 9:38 pm
Location: Sortland, Norway

Re: Complex Puzzle (first is draw)

Post by Nordlandia »

8 
7 
6 
5 
4 
3 
2 
1 
abcdefgh

krb1K1n1/1pBp1p2/P1p2p1n/P2P1p2/5Pp1/2N3P1/8/8 w - - 0 1



8 
7 
6 
5 
4 
3 
2 
1 
abcdefgh

8/1p3pp1/8/1p5B/2p1pP2/2P1P3/kP2K3/8 w - - 0 1





It's cooked.
User avatar
Nordlandia
Posts: 2822
Joined: Fri Sep 25, 2015 9:38 pm
Location: Sortland, Norway

Re: Complex Puzzle (first is draw)

Post by Nordlandia »

8 
7 
6 
5 
4 
3 
2 
1 
abcdefgh

1kB3qn/4Kp2/6p1/3N2P1/1N6/8/8/8 w - - 0 0

Author claims white wins :D
Paloma
Posts: 1204
Joined: Thu Dec 25, 2008 9:07 pm
Full name: Herbert L

Re: Complex Puzzle (first is draw)

Post by Paloma »

User avatar
Nordlandia
Posts: 2822
Joined: Fri Sep 25, 2015 9:38 pm
Location: Sortland, Norway

Re: Complex Puzzle (first is draw)

Post by Nordlandia »

Image



Image

8 
7 
6 
5 
4 
3 
2 
1 
abcdefgh

8/4B3/4p3/8/2rk1P2/2n5/2B5/4K3 w - - 0 0
User avatar
Nordlandia
Posts: 2822
Joined: Fri Sep 25, 2015 9:38 pm
Location: Sortland, Norway

Re: Complex Puzzle (first is draw)

Post by Nordlandia »

Image

Code: Select all

R7/5p1p/1pB3p1/5bP1/K1R5/P1Pk2r1/1p3P2/8 w - - 0 0