Problem: when an extra bishop harms.

Ajedrecista · Post by **Ajedrecista** » Thu Jul 30, 2026 8:02 pm

Hello:

Less is more, sometimes: I composed a simple problem involving zugzwangs and limited moves by the losing side. I usually check YACPDB and PDB, but PDB needs account and login since 20th July, 2026... I am not in the mood of register, so I lose PDB's excellent search options of POSITION and SOL (solution). There might be other similar problems, but I did not found anything.

The problem is easy for SF and Chest, so please do not expect a true challenge. It is instructive to see how the extra black bishop avoids black's king to defend from the back rank, which proves devastating and white makes use of a waiting move in order to create zugzwangs and capture the knight on the rim (is dim → here, is doomed) and the house of cards falls:

[d]7n/5p1b/5Pp1/6pk/6p1/6PK/6P1/8 w - - 0 1

[pgn][Event ""]
[Site ""]
[Round ""]
[Date "2026.07.30"]
[SetUp "1"]
[FEN "7n/5p1b/5Pp1/6pk/6p1/6PK/6P1/8 w - - 0 1"]
[Result "1-0"]
[PlyCount "39"]

1.Kh2 Kh6 2.Kg1 Kh5 3.Kf2 Kh6 4.Ke3 Kh5 5.Ke4 Kh6 6.Ke5 Kh5 7.Kd6 Kh6 8.Ke7 Kh5 9.Ke8 ({(The waiting move. 9.Kf8 also wins, but is slower because 9...Kh6 temporarily avoids the white's king to go to g8, must come back and triangulate)}) Bg8 10.Kf8 Bh7 11.Kg7 Bg8 12.Kxg8 Kh6 13.Kxh8 Kh5 14.Kg8 (14.Kg7? 1/2-1/2 {(Draw by stalemate)}) Kh6 15.Kxf7 Kh7 16.Ke7 Kg8 17.f7+ Kg7 18.f8=R (18.f8=Q+ Kh7 19.Qf1 Kg7 20.Qh1 Kg8 21.Kf6 Kf8 22.Qh8# 1-0) Kh6 19.Rf7 Kh5 Rh7# 1-0[/pgn]

A nice side effect is that the underpromotion to rook checkmates two moves faster than the usual promotion to queen due to stalemate threats that must be avoided.

------------

The problem admits variants. The drawn position without the bishop can be blundered subtly by both sides, exploiting diagonal opposition advantages:

[pgn][Event ""]
[Site ""]
[Round ""]
[Date "2026.07.30"]
[SetUp "1"]
[FEN "7n/5p2/5Pp1/6pk/6p1/6PK/6P1/8 w - - 0 1"]
[Result "1/2-1/2"]

1.Kh2 Kh6 2.Kg1 Kh7! (2...Kh5? 3.Kf2! Kh6 4.Ke3! Kh7 5.Ke4 Kg8 6.Ke5 Kf8 7.Kd6! Ke8 8.Kc7! Kf8 9.Kd8 Kg8 10.Ke8 Kh7 11.Kf8 Kh6 12.Kg8 Kh5 13.Kxh8 Kh6 14.Kg8 Kh5 15.Kxf7 1-0) 3.Kf2 Kg8! 4.Ke3 Kf8! 5.Ke4 Ke8! 6.Ke5 (6.Kd5? Kd7! 7.Ke5 Kc6 8.Ke4 Kd6 9.Kd4 Ke6 10.Ke4 Kxf6 0-1) Kd7 7.Kd5! Ke8 8.Kd6 Kd8! (8...Kf8? 9.Kd7 Kg8 10.Ke8 Kh7 11.Kf8 Kh6 12.Kg8 Kh5 13.Kxh8 Kh6 14.Kg8 Kh5 15.Kxf7 1-0) 9.Kc6! Kc8! 1/2-1/2[/pgn]

Regards from Spain.

Ajedrecista.

Uri Blass · Post by **Uri Blass** » Fri Jul 31, 2026 8:04 am

tested it with some free engines and I am surprised to see that the problem is hard for some engines:

Fruit2.1 get the maximal depth (depth 63) but still get a draw score
Senpai3.01 also get the maximal depth(depth 99) in less than a second but also get a score that is close to draw.
obsidian16.14 got depth 123 in less than a second but it did not help it to find a mate score and the score was still 0.00
Velvet7_3 got depth 127 in less than a second and even this depth did not help it to get a score of more than 0.00
weaker yace could find mate in 20 in less than a second at depth 35 and of course many engines can find it but the surprise is that many engines do not find it including some strong NNUE engines.

towforce · Post by **towforce** » Fri Jul 31, 2026 2:41 pm

Ajedrecista wrote: ↑Thu Jul 30, 2026 8:02 pm Hello:

Less is more, sometimes: I composed a simple problem involving zugzwangs and limited moves by the losing side. I usually check YACPDB and PDB, but PDB needs account and login since 20th July, 2026... I am not in the mood of register, so I lose PDB's excellent search options of POSITION and SOL (solution). There might be other similar problems, but I did not found anything.

The problem is easy for SF and Chest, so please do not expect a true challenge. It is instructive to see how the extra black bishop avoids black's king to defend from the back rank, which proves devastating and white makes use of a waiting move in order to create zugzwangs and capture the knight on the rim (is dim → here, is doomed) and the house of cards falls:

[d]7n/5p1b/5Pp1/6pk/6p1/6PK/6P1/8 w - - 0 1

[pgn][Event ""]
[Site ""]
[Round ""]
[Date "2026.07.30"]
[SetUp "1"]
[FEN "7n/5p1b/5Pp1/6pk/6p1/6PK/6P1/8 w - - 0 1"]
[Result "1-0"]
[PlyCount "39"]

1.Kh2 Kh6 2.Kg1 Kh5 3.Kf2 Kh6 4.Ke3 Kh5 5.Ke4 Kh6 6.Ke5 Kh5 7.Kd6 Kh6 8.Ke7 Kh5 9.Ke8 ({(The waiting move. 9.Kf8 also wins, but is slower because 9...Kh6 temporarily avoids the white's king to go to g8, must come back and triangulate)}) Bg8 10.Kf8 Bh7 11.Kg7 Bg8 12.Kxg8 Kh6 13.Kxh8 Kh5 14.Kg8 (14.Kg7? 1/2-1/2 {(Draw by stalemate)}) Kh6 15.Kxf7 Kh7 16.Ke7 Kg8 17.f7+ Kg7 18.f8=R (18.f8=Q+ Kh7 19.Qf1 Kg7 20.Qh1 Kg8 21.Kf6 Kf8 22.Qh8# 1-0) Kh6 19.Rf7 Kh5 Rh7# 1-0[/pgn]

A nice side effect is that the underpromotion to rook checkmates two moves faster than the usual promotion to queen due to stalemate threats that must be avoided.

The black move 9...Bg8 should come a couple of moves earlier - then it can be defended by putting the king on h7, making the capture of the bishop more difficult.

Uri · Post by **Uri** » Fri Jul 31, 2026 3:35 pm

That was my point all along.

Humans will always have an eye for solving problems that artificial intelligence will never be able to solve, maybe even not in a million years from now when the technology is more advanced.

Ajedrecista · Post by **Ajedrecista** » Fri Jul 31, 2026 7:49 pm

Hello:

Uri Blass wrote: ↑Fri Jul 31, 2026 8:04 am tested it with some free engines and I am surprised to see that the problem is hard for some engines:

Fruit2.1 get the maximal depth (depth 63) but still get a draw score
Senpai3.01 also get the maximal depth(depth 99) in less than a second but also get a score that is close to draw.
obsidian16.14 got depth 123 in less than a second but it did not help it to find a mate score and the score was still 0.00
Velvet7_3 got depth 127 in less than a second and even this depth did not help it to get a score of more than 0.00
weaker yace could find mate in 20 in less than a second at depth 35 and of course many engines can find it but the surprise is that many engines do not find it including some strong NNUE engines.

@Uri: what a great, unexpected surprise! There are many times that old engines find this kind of checkmates in few time. OTOH, I fooled Fruit, Senpai and Obsidian without intending. The problem might not be as easy as I firstly thought, after all.

------------

towforce wrote: ↑Fri Jul 31, 2026 2:41 pmThe black move 9...Bg8 should come a couple of moves earlier - then it can be defended by putting the king on h7, making the capture of the bishop more difficult.

@Graham: I disagree if I understood you about playing 7.- ..., Bg8 instead of 9.- ..., Bg8 (FEN "7n/5p1b/3K1Pp1/6pk/6p1/6P1/6P1/8 b - - 13 7" and black plays 7.- ..., Bg8 instead of 7.- ..., Kh6). I attach the new PGN from the start, to compare the number of moves:

[pgn][Event ""]
[Site ""]
[Round ""]
[Date "2026.07.31"]
[SetUp "1"]
[FEN "7n/5p1b/5Pp1/6pk/6p1/6PK/6P1/8 w - - 0 1"]
[Result "1-0"]
[PlyCount "37"]

1.Kh2 Kh6 2.Kg1 Kh5 3.Kf2 Kh6 4.Ke3 Kh5 5.Ke4 Kh6 6.Ke5 Kh5 7.Kd6 Bg8 ({(7...Kh6 holds the same number of moves)}) 8.Ke7 Kh6 9.Ke8 Kh7 ({(9...Bh7 and 9...Kh5 hold one move more)}) 10.Kf8 Kh6 11.Kxg8 Kh5 12.Kxh8 Kh6 13.Kg8 Kh5 14.Kxf7 Kh6 15.Kg8 Kh5 16.f7 Kh6 17.f8=R Kh5 18.Rf1 Kh6 19.Rh1# 1-0[/pgn]

The plan of setup Bg8 and Kh7 loses one move faster because that setup can not last more than one move (black can only move the king or the bishop, nothing more, so they can not stay there and wait). Again, 9.- Ke8 is faster than the greedy 9.- Kf8. In this side line, both f8=Q and f8=R checkmate in the same number of moves.

------------

Uri wrote: ↑Fri Jul 31, 2026 3:35 pm That was my point all along.

Humans will always have an eye for solving problems that artificial intelligence will never be able to solve, maybe even not in a million years from now when the technology is more advanced.

@Uri: 'a million years from now' looks excessive. Who knows if humans are still a thing on the Earth? The stall of technology reminds me the myth of 'Everything that can be invented has been invented'.

Regards from Spain.

Ajedrecista.

towforce · Post by **towforce** » Sat Aug 01, 2026 9:13 am

Ajedrecista wrote: ↑Fri Jul 31, 2026 7:49 pm
towforce wrote: ↑Fri Jul 31, 2026 2:41 pmThe black move 9...Bg8 should come a couple of moves earlier - then it can be defended by putting the king on h7, making the capture of the bishop more difficult.
@Graham: I disagree if I understood you about playing 7.- ..., Bg8 instead of 9.- ..., Bg8 (FEN "7n/5p1b/3K1Pp1/6pk/6p1/6P1/6P1/8 b - - 13 7" and black plays 7.- ..., Bg8 instead of 7.- ..., Kh6). I attach the new PGN from the start, to compare the number of moves:

[pgn][Event ""]
[Site ""]
[Round ""]
[Date "2026.07.31"]
[SetUp "1"]
[FEN "7n/5p1b/5Pp1/6pk/6p1/6PK/6P1/8 w - - 0 1"]
[Result "1-0"]
[PlyCount "37"]

1.Kh2 Kh6 2.Kg1 Kh5 3.Kf2 Kh6 4.Ke3 Kh5 5.Ke4 Kh6 6.Ke5 Kh5 7.Kd6 Bg8 ({(7...Kh6 holds the same number of moves)}) 8.Ke7 Kh6 9.Ke8 Kh7 ({(9...Bh7 and 9...Kh5 hold one move more)}) 10.Kf8 Kh6 11.Kxg8 Kh5 12.Kxh8 Kh6 13.Kg8 Kh5 14.Kxf7 Kh6 15.Kg8 Kh5 16.f7 Kh6 17.f8=R Kh5 18.Rf1 Kh6 19.Rh1# 1-0[/pgn]

The plan of setup Bg8 and Kh7 loses one move faster because that setup can not last more than one move (black can only move the king or the bishop, nothing more, so they can not stay there and wait). Again, 9.- Ke8 is faster than the greedy 9.- Kf8. In this side line, both f8=Q and f8=R checkmate in the same number of moves.

Yes - you're absolutely right. Once the white king is on e7, it will win the zugzwang because it can either go to f8 and attack the bishop or it can go to e8 and bypass a move.

Ajedrecista · Post by **Ajedrecista** » Mon Aug 03, 2026 8:41 pm

Hello:

I tried to add more pieces to the position and looks like my copy of SF 18 gets fooled in my modest hardware and does not see the plan. There can be other winning plans, but probably not that faster like the original:

[d]7n/5p1b/5Pp1/5ppk/4p1r1/5QPK/6P1/8 w - - 0 1

[pgn][Event ""]
[Site ""]
[Round ""]
[Date "2026.08.03"]
[SetUp "1"]
[FEN "7n/5p1b/5Pp1/5ppk/4p1r1/5QPK/6P1/8 w - - 0 1"]
[Result "1-0"]
[PlyCount "43"]

1.Qxg4+ fxg4+ (1...Kh6 2.Kh2 (2.Qd1 f4? (2...g4+ 3.Kh2 (3.Kh4? (3.Qxg4? fxg4+ 4.Kh2 (4.Kxg4 g5 5.Kh3 e3 0-1) e3 5.Kg1 Kg5 6.Kf1 Kf5 7.Ke2 Ke4 0-1) g5# 0-1) 1-0) 3.Kg4 e3 4.Qh1# 1-0) fxg4 ({(Other move results in 3.Qh3#)}) 3.Kg1 ({(With the same idea than the mainline)}) 1-0) 2.Kh2 e3 ({(2...Bg8 and 2...Kh6 lose in the same number of moves than 2...e3)}) 3.Kg1 e2 4.Kf2 e1=Q+ 5.Kxe1 Kh6 6.Ke2 Kh5 7.Ke3 Kh6 8.Ke4 Kh5 9.Ke5 Kh6 10.Kd6 Kh5 11.Ke7 Kh6 12.Kf8 ({(Without the waiting move Ke8 this time)}) 12...Kh5 13.Kg7 Bg8 14.Kxh8 (14.Kxg8 Kh6 15.Kxh8 Kh5 16.Kg8 (16.Kg7? 1/2-1/2) 1-0) 14...Bh7 15.Kg7 (15.Kxh7? 1/2-1/2) 15...Bg8 16.Kxg8 Kh6 17.Kxf7 Kh7 18.Ke7 Kg8 19.f7+ Kh7 20.Kf6 (20.f8=Q? 1/2-1/2) 20...Kh8 21.f8=Q+ Kh7 22.Qg7# 1-0[/pgn]

I annotated some traps in the PGN (stalemates, a black win...). Analysis by SF 18:

Code: Select all

FEN: 7n/5p1b/5Pp1/5ppk/4p1r1/5QPK/6P1/8 w - - 0 1

Stockfish-18-windows-x86-64-sse41-popcnt:
[...]
---------------------------------------------------------------------------
 35/18	05:13	 241.718.507	771.578	 0,00	Qf3a3 f5f4 Qa3a8 Rg4xg3+ Kh3h2 e4e3 Qa8xh8 e3e2 Qh8xh7+ Kh5g4 Qh7xf7 e2e1Q Qf7d7+ Kg4h4 Qd7h7+ Kh4g4
 35/26	05:13	 241.718.507	771.578	 0,00	Qf3b3 e4e3 Qb3d3 Rg4e4 g3g4+ Kh5h6 Kh3h2 Re4xg4 Qd3xe3 Rg4h4+ Kh2g1 Bh7g8 Qe3e8 g5g4 Qe8xg8 Kh6g5 g2g3 Rh4h3 Qg8b8 Kg5xf6 Qb8b2+ Kf6e7 Qb2a3+ Ke7f6 Qa3b2+
 35/65	05:13	 241.718.507	771.625	 0,00	Qf3f2 e4e3 Qf2e2 Kh5h6 Qe2xe3 f5f4 Qe3e8 Rg4xg3+ Kh3h2 g5g4 Qe8xh8 Kh6g5 Qh8e8 Kg5xf6 Qe8d8+ Kf6f5 Qd8c7 Bh7g8 Qc7a5+ Kf5f6 Qa5d8+ Kf6g7 Qd8d4+ f7f6 Qd4xf4 Rg3d3 g2g3 Rd3d5 Kh2g2 Rd5h5 Kg2g1 Rh5g5 Qf4e3 Rg5a5
 35/37	05:13	 241.718.507	771.625	 0,00	Qf3f1 Kh5h6 Qf1c1 e4e3 Qc1xe3 f5f4 Qe3d2 Rg4xg3+ Kh3h2 Kh6h5 Qd2d8 g5g4 Qd8xh8 Rg3d3 Kh2g1 Kh5g5 Qh8e8 Kg5xf6 Qe8h8+ Kf6g5 Qh8e5+ f7f5 Qe5e7+ Kg5h6 Qe7h4+ Kh6g7 Qh4g5 g4g3 Kg1f1 Rd3d4 Qg5e7+ Kg7h6 Qe7f8+ Kh6g5 Qf8e7+
 35/76	05:13	 241.718.507	771.625	 0,00	Qf3d1 e4e3 Qd1e2 Kh5h6 Qe2xe3 f5f4 Qe3e8 Rg4xg3+ Kh3h2 g5g4 Qe8xh8 Kh6g5 Qh8xh7 Rg3d3 Qh7h8 Rd3d1 g2g3 f4xg3+ Kh2xg3 Rd1d3+ Kg3g2 Rd3d2+ Kg2f1 Rd2d1+ Kf1e2 Rd1d5 Qh8e8 Rd5f5 Ke2e3 Kg5xf6 Qe8h8+ Kf6e7 Qh8b8 Rf5g5
 35/76	05:13	 241.718.507	771.625	+0,43	Qf3e2 Kh5h6 Kh3h2 e4e3 Qe2xe3 Rg4e4 Qe3d2 Re4e6 g3g4 Re6xf6 Qd2c3 Kh6g7 Kh2g3 Bh7g8 Qc3d4 Bg8h7 Qd4b2 Bh7g8 Qb2e5 Bg8h7 Qe5d4 Bh7g8 Kg3f2 Bg8h7 Qd4b2 Bh7g8 Qb2c3 Bg8h7 Qc3d4 Bh7g8 Qd4b2 Bg8h7 Qb2a1 Bh7g8 Kf2f3
 35/69	05:13	 241.718.507	771.625	+5,30	Qf3e3 Bh7g8 Kh3h2 Bg8h7 Qe3c1 e4e3 Qc1xe3 Rg4b4 Qe3e8 g5g4 Qe8xh8 Kh5g5 Qh8xh7 Kg5xf6 Qh7h8+ Kf6e6 Qh8e8+ Ke6f6 Qe8c6+ Kf6g5 Qc6c1+ Kg5h5 Qc1c8 g6g5 Qc8xf5 Rb4b6 Qf5xf7+ Kh5h6 Qf7f5 Kh6h5 Qf5h7+ Rb6h6 Qh7g7 Rh6f6 Qg7c7

There were 2,816,733 TB hits to the full set of 3, 4 and 5-man Syzygy EGTB.

SF 18 is blind to the sideline of 1.- Qxg4+, Kh6 and only evaluate 2.- Kh2 as winning after playing that. It favours 1.- Qe3 instead going all-in with 1.- Qxg4+. Then, both 1.- ..., fxg4+ (resulting in the same position than the OP, plus a black pawn on e4) and 1.- ..., Kh6 result in the same checkmate (lenght-wise):

Chest 5.2 could not solve the position, either. Might be a shorter checkmate than the 'straight' #22, using the power of the queen?

Any insights are welcome.

Regards from Spain.

Ajedrecista.

Uri Blass · Post by **Uri Blass** » Tue Aug 04, 2026 12:20 am

tried stockfish from 26.7 with multi-pv

got the following analysis that suggest to investigate Qe2 and Qd1 as alternatives but Qxg4+ is best from depth 22:
[d]7n/5p1b/5Pp1/5ppk/4p1r1/5QPK/6P1/8 w - - 0 1

Stockfish260726:

21/35 00:09 47,424k 4,784k 0.00 Qf3-a3 f5-f4 Qa3-f8 Rg4xg3+ Kh3-h2 e4-e3 Qf8xh8 e3-e2 Qh8xh7+ Kh5-g4 Qh7xf7 Rg3-e3 Qf7-d7+ Kg4-h5 g2-g4+ f4xg3/ep+ Kh2-g2 g5-g4 Qd7-d5+ Kh5-h4 Qd5-d8 e2-e1N+
21/35 00:09 47,424k 4,784k 0.00 Qf3-c3 f5-f4 Qc3-c8 Rg4xg3+ Kh3-h2 e4-e3 Qc8xh8 e3-e2 Qh8xh7+ Kh5-g4 Qh7xf7 Rg3-e3 Qf7-d7+ Kg4-h5 g2-g4+ f4xg3/ep+ Kh2-g2 g5-g4 Qd7-d5+ Kh5-h4 Qd5-d8 e2-e1Q f6-f7+ Kh4-h5 Qd8-h8+ Kh5-g5 Qh8-f6+ Kg5xf6 f7-f8Q+ Kf6-g5 Qf8-f4+ Kg5-h5 Qf4xg4+ Kh5xg4
21/32 00:09 47,424k 4,784k 0.00 Qf3xg4+ f5xg4+ Kh3-h2 Kh5-h6 Kh2-g1 Bh7-g8 Kg1-f2 Kh6-h5 Kf2-e3 Kh5-h6
21/53 00:09 47,424k 4,784k +0.14 Qf3-b3 e4-e3 Qb3-d3 Kh5-h6 Qd3xe3 f5-f4 Qe3-e8 Rg4xg3+ Kh3-h2 g5-g4 Qe8xh8 Rg3-d3 Qh8-g7+ Kh6-g5 Qg7xh7 Rd3-d1 g2-g3 f4xg3+ Kh2xg3 Rd1-d3+ Kg3-g2 Rd3-d2+ Kg2-f1 Rd2-d6 Qh7-h8 Rd6xf6+ Kf1-g2 Rf6-f3
21/70 00:09 47,424k 4,784k +0.19 Qf3-f1 Kh5-h6 Qf1-e2 e4-e3 Qe2xe3 f5-f4 Qe3-e8 Rg4xg3+ Kh3-h2 g5-g4 Qe8xh8 Rg3-d3 Qh8-e8 Rd3-d1 Qe8-b8 Rd1-f1 g2-g3 f4xg3+ Kh2-g2 Rf1-f2+
21/68 00:09 47,424k 4,784k +0.42 Qf3-f2 e4-e3 Qf2-f3 Kh5-h6 Kh3-h2 e3-e2 Qf3xe2 Rg4-e4 Qe2-d2 Re4-e6 g3-g4 Re6xf6 Qd2-b2 Kh6-g7 Kh2-h1 Bh7-g8 Qb2-c3 Bg8-h7 Kh1-g1 Bh7-g8 Qc3-d4
21/66 00:09 47,424k 4,784k +0.42 Qf3-e2 e4-e3 Kh3-h2 Kh5-h6 Qe2xe3 Rg4-e4 Qe3-c1 Re4-e6 g3-g4 Re6xf6 Qc1-a1 Kh6-g7 Kh2-h1 Bh7-g8 Qa1-d4 Bg8-h7 Qd4-e5 Bh7-g8 Kh1-g1 Bg8-h7 Qe5-c3 f5-f4 Qc3-d3
21/57 00:09 47,424k 4,784k +0.47 Qf3-d1 e4-e3 Kh3-h2 Kh5-h6 Qd1-f3 e3-e2 Qf3xe2 Rg4-e4 Qe2-d2 Re4-e6 g3-g4 Re6xf6 Qd2-b2 Kh6-g7 Kh2-h1 Bh7-g8 Qb2-c3 Bg8-h7 Kh1-g1 f5-f4
21/91 00:09 47,424k 4,784k +4.62 Qf3-e3 Rg4-h4+ g3xh4 g5xh4 Qe3-e2+ Kh5-h6 Qe2-b5 g6-g5 Qb5-e8 g5-g4+ Kh3xh4 Nh8-g6+ Kh4-g3 Kh6-g5 Qe8xf7 e4-e3 Qf7-e6 f5-f4+ Kg3-h2 e3-e2
---------------------------------------------------------------------------
22/17 00:51 264,458k 5,182k 0.00 Qf3-a3 f5-f4 Qa3-f8 Rg4xg3+ Kh3-h2 e4-e3 Qf8xh8 e3-e2 Qh8xh7+ Kh5-g4 Qh7xf7 e2-e1Q Qf7-d7+ Kg4-h5 Qd7-h7+ Kh5-g4
22/55 00:51 264,458k 5,182k 0.00 Qf3-c3 f5-f4 Qc3-c8 Rg4xg3+ Kh3-h2 e4-e3 Qc8xh8 e3-e2 Qh8xh7+ Kh5-g4 Qh7xf7 e2-e1Q Qf7-d7+ Kg4-h5 Qd7-h7+ Kh5-g4 Qh7-d7+
22/54 00:51 264,458k 5,182k +0.22 Qf3-b3 e4-e3 Qb3-d3 Rg4-e4 g3-g4+ Kh5-h6 Kh3-h2 Re4xg4 Qd3xe3 Rg4-h4+ Kh2-g1 Bh7-g8 Qe3-e8 g5-g4 Qe8xg8 Kh6-g5 Qg8-b8 Rh4-h7 Qb8-e5 g4-g3 Qe5xg3+ Kg5xf6 Qg3-c3+ Kf6-e7 Qc3-c5+ Ke7-f6 Qc5-d4+ Kf6-e7 Qd4-b4+ Ke7-f6 Qb4-b2+ Kf6-e7 Kg1-f2 Rh7-h5 Qb2-a3+ Ke7-f6 Qa3-c3+ Kf6-e7 Qc3-c5+ Ke7-f6 Qc5-d4+ Kf6-e7 Qd4-b4+ Ke7-f6
22/55 00:51 264,458k 5,182k +0.40 Qf3-f2 e4-e3 Qf2-f3 Kh5-h6 Kh3-h2 e3-e2 Qf3xe2 Rg4-e4 Qe2-d2 Re4-e6 g3-g4 Re6xf6 Qd2-d8 Kh6-g7 Qd8-d4 Bh7-g8 Qd4-a1 Bg8-h7 Kh2-h1 Bh7-g8 Qa1-e5
22/57 00:51 264,458k 5,182k +0.42 Qf3-f1 e4-e3 Qf1-e2 Kh5-h6 Qe2xe3 Rg4-e4 Qe3-d2 Re4-e6 Kh3-h2 Re6xf6 Qd2-b2 Kh6-g7 g3-g4 Bh7-g8 Qb2-d4 Bg8-h7 Qd4-e5 Bh7-g8 Kh2-g1 Bg8-h7 Qe5-a1 Bh7-g8 Kg1-h2 Bg8-h7 Kh2-h1 Bh7-g8 Qa1-e5 Bg8-h7 Qe5-b2 Bh7-g8 Kh1-g1 Bg8-h7 Qb2-d4 Bh7-g8 Qd4-c3 Bg8-h7 Kg1-h2 Bh7-g8 Kh2-g3 Bg8-h7 Qc3-e5 Bh7-g8 Kg3-h2
22/51 00:51 264,458k 5,182k +5.57 Qf3-e3 Rg4-h4+ g3xh4 g5xh4 Qe3-e2+ Kh5-h6 Qe2-b5 g6-g5 Qb5-e8 g5-g4+ Kh3xh4 Nh8-g6+ Kh4-g3 e4-e3 Qe8xf7 f5-f4+ Kg3-h2 e3-e2 Qf7-e8 f4-f3 g2xf3 Ng6-f4
22/86 00:51 264,458k 5,182k +6.09 Qf3-e2 Kh5-h6 Kh3-h2 Rg4-f4 g3xf4 g5xf4 Qe2-b5 Kh6-g5 Qb5-e8 Kg5xf6 Qe8xh8+ Kf6-e6 Qh8xh7 Ke6-e7 Qh7-h4+ Ke7-f8 Qh4xf4 f7-f6
22/79 00:51 264,458k 5,182k +6.19 Qf3-d1 e4-e3 Kh3-h2 Bh7-g8 Qd1-f3 Bg8-h7 Qf3xe3 Rg4-b4 Qe3-e8 g5-g4 Qe8xh8 Kh5-g5 Qh8xh7 Kg5xf6 Qh7-h8+ Kf6-e6 Qh8-e8+ Ke6-d5 Qe8xf7+ Kd5-d4 Qf7-f6+ Kd4-d5 Qf6xg6 Kd5-d4 Qg6xf5 Kd4-e3 Qf5-c5+ Rb4-d4 Qc5-b5 Ke3-e4 Qb5-g5 Ke4-d3 Kh2-g1 Rd4-c4
22/54 00:51 264,458k 5,182k +M27 Qf3xg4+ f5xg4+ Kh3-h2 e4-e3 Kh2-g1 e3-e2 Kg1-f2 e2-e1R Kf2xe1 Bh7-g8 Ke1-e2 Bg8-h7 Ke2-e3 Bh7-g8 Ke3-d4 Kh5-h6 Kd4-e4 Kh6-h5 Ke4-e5 Kh5-h6 Ke5-d6 Kh6-h7 Kd6-e7 Kh7-h6 Ke7-e8 Kh6-h5 Ke8-f8 Bg8-h7 Kf8-g7 Bh7-g8 Kg7xg8 Kh5-h6 Kg8xh8 Kh6-h5 Kh8-g8 Kh5-h6 Kg8xf7 Kh6-h5 Kf7-e8 Kh5-h6 f6-f7 Kh6-h7 Ke8-e7 Kh7-h6 f7-f8Q+ Kh6-h7 Qf8-f6 Kh7-g8 Ke7-e8 Kg8-h7 Ke8-f8 Kh7-h6 Qf6-h8+
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23/104 09:24 5,442,352k 9,639k 0.00 Qf3-a3 f5-f4 Qa3-f8 Rg4xg3+ Kh3-h2 e4-e3 Qf8xh8 e3-e2 Qh8xh7+ Kh5-g4 Qh7xf7 e2-e1Q Qf7-d7+ Kg4-h4 Qd7-h7+ Kh4-g4 Qh7-d7+
23/100 09:24 5,442,352k 9,639k 0.00 Qf3-c3 f5-f4 Qc3-c8 Rg4xg3+ Kh3-h2 e4-e3 Qc8xh8 e3-e2 Qh8xh7+ Kh5-g4 Qh7xf7 e2-e1Q Qf7-d7+ Kg4-h4 Qd7-h7+ Kh4-g4
23/86 09:24 5,442,352k 9,639k +0.36 Qf3-f1 e4-e3 Qf1-f3 Kh5-h6 Kh3-h2 e3-e2 Qf3xe2 Rg4-e4 Qe2-d2 Re4-e6 Qd2-d8 g5-g4 Qd8xh8 Kh6-g5 Qh8xh7 Kg5xf6 Qh7-h8+ Kf6-e7 Qh8-a8 Re6-e4 Qa8-a3+ Ke7-f6 Qa3-c5 Kf6-g7 Qc5-c3+ Kg7-g8 Qc3-c8+ Kg8-g7 Qc8-d8 Re4-e6 Qd8-d4+ Kg7-g8 Qd4-c4
23/108 09:24 5,442,352k 9,639k +0.42 Qf3-b3 e4-e3 Qb3-d3 Rg4-e4 g3-g4+ Kh5-h6 Kh3-h2 Re4xg4 Qd3xe3 Rg4-h4+ Kh2-g1 Bh7-g8 Qe3-c1 Kh6-h5 Qc1-c8 g5-g4 Qc8xg8 Kh5-g5 Qg8-b8 Rh4-h7 Qb8-e5 g4-g3 Qe5xg3+ Kg5xf6 Qg3-c3+ Kf6-e6
23/89 09:24 5,442,352k 9,639k +0.51 Qf3-f2 e4-e3 Qf2-f3 Kh5-h6 Kh3-h2 e3-e2 Qf3xe2 Rg4-e4 Qe2-d2 Re4-e6 Qd2-d8 g5-g4 Qd8xh8 Kh6-g5 Qh8xh7 Kg5xf6 Qh7-h8+ Kf6-e7 Qh8-a8 Re6-e4 Qa8-a3+ Ke7-e6 Qa3-a5 Re4-e5
23/84 09:24 5,442,352k 9,639k +5.65 Qf3-e3 Rg4-h4+ g3xh4 g5xh4 Qe3-e2+ Kh5-h6 Qe2-b5 g6-g5 Qb5-e8 g5-g4+ Kh3xh4 Nh8-g6+ Kh4-g3 Kh6-g5 Qe8xf7 e4-e3 Qf7-e6 f5-f4+ Kg3-h2 g4-g3+ Kh2-h3 Ng6-h8
23/54 09:24 5,442,352k 9,639k +8.33 Qf3xg4+ f5xg4+ Kh3-h2 e4-e3 Kh2-g1 e3-e2 Kg1-f2 e2-e1R Kf2xe1 Kh5-h6 Ke1-e2 Kh6-h5 Ke2-e3 Bh7-g8 Ke3-d4 Kh5-h6 Kd4-e5 Bg8-h7 Ke5-d6 Bh7-g8 Kd6-e7 Kh6-h5 Ke7-f8 Bg8-h7 Kf8-g7 Bh7-g8 Kg7xg8 Kh5-h6 Kg8xh8 Kh6-h5 Kh8-g8 Kh5-h6 Kg8xf7 Kh6-h5 Kf7-e8 Kh5-h6
23/60 09:24 5,442,352k 9,639k +9.46 Qf3-e2 Kh5-h6 Qe2xg4 f5xg4+ Kh3-h2 e4-e3 Kh2-g1 e3-e2 Kg1-f2 e2-e1Q+ Kf2xe1 Kh6-h5 Ke1-e2 Bh7-g8 Ke2-e3 Bg8-h7 Ke3-e4 Bh7-g8 Ke4-e5 Kh5-h6 Ke5-d6 Kh6-h5 Kd6-d7 Bg8-h7 Kd7-e8 Bh7-g8 Ke8-f8 Bg8-h7 Kf8-g7 Bh7-g8 Kg7xh8 Bg8-h7 Kh8-g7 Bh7-g8 Kg7xg8 Kh5-h6 Kg8xf7
23/101 09:24 5,442,352k 9,639k +10.75 Qf3-d1 e4-e3 Kh3-h2 Bh7-g8 Qd1-f3 Bg8-h7 Qf3xe3 Rg4-b4 Qe3-e8 g5-g4 Qe8xh8 Kh5-g5 Qh8xh7 f5-f4 Qh7xf7 f4-f3 Qf7-e7 Kg5-f5 Qe7xb4 f3xg2 Kh2xg2 Kf5-e6 Qb4-e4+ Ke6-d7 f6-f7 g6-g5 Qe4xg4+ Kd7-c6 Qg4-e6+ Kc6-b7 Kg2-f2 Kb7-a7 f7-f8Q
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24/35 32:11 23,345,298k 12,087k 0.00 Qf3-a3 f5-f4 Qa3-f8 Rg4xg3+ Kh3-h2 e4-e3 Qf8xh8 e3-e2 Qh8xh7+ Kh5-g4 Qh7xf7 Rg3-e3 Qf7-d7+ Kg4-h4 g2-g3+ f4xg3+ Kh2-g2 g5-g4 Qd7-h7+ Kh4-g5 f6-f7 e2-e1Q Qh7-h6+ Kg5xh6 f7-f8Q+ Kh6-g5
24/45 32:11 23,345,298k 12,087k 0.00 Qf3-c3 f5-f4 Qc3-c8 Rg4xg3+ Kh3-h2 e4-e3 Qc8xh8 e3-e2 Qh8xh7+ Kh5-g4 Qh7xf7 Rg3-e3 Qf7-d7+ Kg4-h4 g2-g3+ f4xg3+ Kh2-g2 g5-g4 Qd7-h7+ Kh4-g5 f6-f7 e2-e1Q Qh7-h6+ Kg5xh6 f7-f8Q+ Kh6-h7
24/56 32:11 23,345,298k 12,087k +0.18 Qf3-b3 e4-e3 Qb3-d3 Rg4-e4 g3-g4+ Kh5-h6 Kh3-h2 Re4xg4 Qd3xe3 Rg4-h4+ Kh2-g1 Bh7-g8 Qe3-e8 g5-g4 Qe8xg8 Kh6-g5 Qg8-b8 Rh4-h7 Qb8-e5 g4-g3 Qe5xg3+ Kg5xf6 Qg3-c3+ Kf6-e7 Qc3-b4+ Ke7-f6 Qb4-b2+ Kf6-e6
24/59 32:11 23,345,298k 12,087k +0.47 Qf3-f1 Kh5-h6 Qf1-f2 e4-e3 Qf2xe3 f5-f4 Qe3-c1 Rg4xg3+ Kh3-h2 Rg3-d3 g2-g4 f4xg3/ep+ Kh2-g2 Kh6-h5 Qc1-h1+ Kh5-g4 Qh1-e1 Rd3-d4 Qe1xg3+ Kg4-h5 Qg3-h3+ Rd4-h4 Qh3-c8 Rh4-d4
24/60 32:11 23,345,298k 12,087k +0.74 Qf3-f2 e4-e3 Qf2-f3 Kh5-h6 Kh3-h2 e3-e2 Qf3xe2 Rg4-e4 Qe2-d2 Re4-e6 Qd2-d8 g5-g4 Qd8xh8 Kh6-g5 Qh8-g7 Bh7-g8 Qg7xg8 Kg5xf6 Qg8-h8+ Kf6-e7 Qh8-a8 Re6-e4 Qa8-b7+
24/36 32:11 23,345,298k 12,087k +5.63 Qf3-e3 Rg4-f4 g3xf4 g5-g4+ Kh3-g3 g6-g5 Qe3-c1 g5xf4+ Qc1xf4 Kh5-g6 Kg3-f2 Kg6xf6 Qf4-h6+ Nh8-g6 Qh6xh7 Kf6-e6 g2-g3 Ke6-f6 Qh7-g8 Ng6-e7
24/70 32:11 23,345,298k 12,087k +59.28 Qf3-d1 e4-e3 Kh3-h2 Bh7-g8 Qd1-f3 Bg8-h7 Qf3xe3 Rg4-b4 Qe3-e8 g5-g4 Qe8xh8 Kh5-g5 Qh8xh7 Kg5xf6 Qh7-h8+ Kf6-e6 Qh8-e8+ Ke6-d5 Qe8xf7+ Kd5-d4 Qf7-d7+ Kd4-c5 Qd7-e7+ Kc5-b5 Qe7-f6 Kb5-c4 Qf6-c6+ Kc4-d4 Qc6-d6+ Kd4-c3
24/84 32:11 23,345,298k 12,087k +59.28 Qf3-e2 e4-e3 Kh3-h2 Bh7-g8 Qe2-d1 Bg8-h7 Qd1-f3 Bh7-g8 Qf3-e2 Bg8-h7 Qe2-d1 Bh7-g8 Qd1-f3 Bg8-h7 Qf3xe3 Rg4-b4 Qe3-e8 g5-g4 Qe8xh8 Kh5-g5 Qh8xh7 Kg5xf6 Qh7-h8+ Kf6-e6 Qh8-e8+ Ke6-d5 Qe8xf7+ Kd5-d4 Qf7xg6 Kd4-e5
24/56 32:11 23,345,298k 12,087k +M26 Qf3xg4+ f5xg4+ Kh3-h2 e4-e3 Kh2-g1 e3-e2 Kg1-f2 e2-e1R Kf2xe1 Bh7-g8 Ke1-d1 Bg8-h7 Kd1-e2 Bh7-g8 Ke2-d3 Bg8-h7 Kd3-e3 Bh7-g8 Ke3-d4 Kh5-h6 Kd4-e5 Kh6-h7 Ke5-d6 Kh7-h6 Kd6-e7 Kh6-h5 Ke7-f8 Bg8-h7 Kf8-g7 Bh7-g8 Kg7xg8 Kh5-h6 Kg8xh8 Kh6-h5 Kh8-g8 Kh5-h6 Kg8xf7 Kh6-h5 Kf7-g8 Kh5-h6 f6-f7 Kh6-h5 Kg8-f8 Kh5-h6 Kf8-e7 Kh6-g7 f7-f8R Kg7-h7 Ke7-f6 Kh7-h6 Rf8-h8+
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25/39 32:13 23,371,813k 12,088k 0.00 Qf3-a3 f5-f4 Qa3-f8 Rg4xg3+ Kh3-h2 e4-e3 Qf8xh8 e3-e2 Qh8xh7+ Kh5-g4 Qh7xf7 Rg3-e3 Qf7-d7+ Kg4-h4 g2-g3+ f4xg3+ Kh2-g2 g5-g4 Qd7-h7+ Kh4-g5 f6-f7 e2-e1Q Qh7-h6+ Kg5xh6 f7-f8Q+ Kh6-g5 Qf8-e7+
25/31 32:13 23,371,813k 12,088k 0.00 Qf3-c3 f5-f4 Qc3-c8 Rg4xg3+ Kh3-h2 e4-e3 Qc8xh8 e3-e2 Qh8xh7+ Kh5-g4 Qh7xf7 Rg3-e3 Qf7-d7+ Kg4-h4 g2-g3+ f4xg3+ Kh2-g2 g5-g4 Qd7-h7+ Kh4-g5 f6-f7 e2-e1Q Qh7-h6+ Kg5xh6 f7-f8Q+ Kh6-g5 Qf8-f6+
25/60 32:13 23,371,813k 12,088k +0.10 Qf3-b3 e4-e3 Qb3-d3 Rg4-e4 g3-g4+ Kh5-h6 Kh3-h2 Re4xg4 Qd3xe3 Rg4-h4+ Kh2-g1 Bh7-g8 Qe3-e8 g5-g4 Qe8xg8 Kh6-g5 Qg8-b8 Rh4-h7 Qb8-e5 g4-g3 Qe5xg3+ Kg5xf6 Qg3-c3+ Kf6-e7 Qc3-d3
25/58 32:13 23,371,813k 12,088k +0.54 Qf3-f1 Kh5-h6 Qf1-f2 e4-e3 Qf2xe3 f5-f4 Qe3-e8 Rg4xg3+ Kh3-h2 g5-g4 Qe8xh8 Rg3-d3 Kh2-g1 g4-g3 Kg1-f1 Kh6-g5 Qh8xh7 f4-f3 g2xf3 Rd3xf3+ Kf1-g2 Rf3xf6 Kg2xg3 Rf6-f4 Qh7-g8 Rf4-g4+ Kg3-f2 f7-f5 Qg8-d8+ Kg5-h6 Qd8-h8+ Kh6-g5 Kf2-e3 Rg4-e4+ Ke3-d3 Re4-f4 Qh8-c8 Rf4-g4
25/51 32:13 23,371,813k 12,088k +0.80 Qf3-f2 e4-e3 Qf2-f3 Kh5-h6 Kh3-h2 e3-e2 Qf3xe2 Rg4-e4 Qe2-d2 Re4-e6 Qd2-d8 g5-g4 Qd8xh8 Kh6-g5 Qh8-g7 Bh7-g8 Qg7xg8 Kg5xf6 Qg8-h8+ Kf6-e7 Qh8-h4+ Ke7-d7 Qh4-g5 Kd7-e8 Qg5-d2 Ke8-f8 Qd2-d4
25/33 32:13 23,371,813k 12,088k +5.12 Qf3-e3 Rg4-f4 g3xf4 g5-g4+ Kh3-g3 g6-g5 Qe3-c1 g5xf4+ Qc1xf4 Kh5-g6 Kg3-f2 Kg6xf6 Qf4-h6+ Nh8-g6 Qh6xh7 Kf6-e7 Qh7-g7 Ke7-e6 Kf2-e3 Ke6-e7 Qg7-d4
25/86 32:13 23,371,813k 12,088k +59.28 Qf3-d1 e4-e3 Kh3-h2 Bh7-g8 Qd1-f3 Bg8-h7 Qf3-e2 Bh7-g8 Qe2-d1 Bg8-h7 Qd1-f3 Bh7-g8 Qf3-e2 Bg8-h7 Qe2xe3 Rg4-b4 Qe3-e8 g5-g4 Qe8xh8 Kh5-g5 Qh8xh7 Kg5xf6 Qh7-h8+ Kf6-e6 Qh8-e8+ Ke6-d5 Qe8xf7+ Kd5-d4 Qf7xg6 Rb4-a4 Qg6-f6+ Kd4-d3 Qf6xf5+ Kd3-e3 Qf5-e5+ Ke3-d3 Qe5-b5+ Ra4-c4 Qb5-f5+ Kd3-d2 Qf5-d5+ Kd2-c3 Kh2-g1 Rc4-a4 Kg1-f2 Ra4-d4 Qd5-e5 Kc3-b4 Qe5xd4+ Kb4-a5
25/75 32:13 23,371,813k 12,088k +59.28 Qf3-e2 e4-e3 Kh3-h2 Bh7-g8 Qe2-d1 Bg8-h7 Qd1-f3 Bh7-g8 Qf3-e2 Bg8-h7 Qe2-d1 Bh7-g8 Qd1-f3 Bg8-h7 Qf3xe3 Rg4-b4 Qe3-e8 g5-g4 Qe8xh8 Kh5-g5 Qh8xh7 Kg5xf6 Qh7-h8+ Kf6-e6 Qh8-e8+ Ke6-d5 Qe8xf7+ Kd5-d4 Qf7xg6 Rb4-a4 Qg6xf5 Kd4-c3
25/54 32:13 23,371,813k 12,088k +M25 Qf3xg4+ f5xg4+ Kh3-h2 e4-e3 Kh2-g1 e3-e2 Kg1-f2 e2-e1R Kf2xe1 Bh7-g8 Ke1-f2 Bg8-h7 Kf2-e3 Bh7-g8 Ke3-e4 Kh5-h6 Ke4-d5 Kh6-h5 Kd5-d6 Bg8-h7 Kd6-e7 Kh5-h6 Ke7-f8 Kh6-h5 Kf8-g7 Bh7-g8 Kg7xg8 Kh5-h6 Kg8xh8 Kh6-h5 Kh8-g8 Kh5-h6 Kg8xf7 Kh6-h7 Kf7-e7 Kh7-g8 f6-f7+ Kg8-g7 f7-f8Q+ Kg7-h7 Qf8-f6 Kh7-g8 Qf6xg6+ Kg8-h8 Qg6xg5 Kh8-h7 Ke7-f6 Kh7-h8 Qg5-g7+
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26/18 33:18 24,333,504k 12,173k 0.00 Qf3-a3 f5-f4 Qa3-f8 Rg4xg3+ Kh3-h2 e4-e3 Qf8xh8 e3-e2 Qh8xh7+ Kh5-g4 Qh7xf7 Rg3-e3 Qf7-d7+ Kg4-h4 Qd7-h7+ Kh4-g4
26/29 33:18 24,333,504k 12,173k 0.00 Qf3-c3 f5-f4 Qc3-c8 Rg4xg3+ Kh3-h2 e4-e3 Qc8xh8 e3-e2 Qh8xh7+ Kh5-g4 Qh7xf7 Rg3-e3 Qf7-d7+ Kg4-h4 Qd7-h7+ Kh4-g4 Qh7-d7+
26/76 33:18 24,333,504k 12,173k +0.27 Qf3-b3 e4-e3 Qb3-d3 Rg4-e4 g3-g4+ Kh5-h6 Kh3-h2 Re4xg4 Qd3xe3 Rg4-h4+ Kh2-g1 Bh7-g8 Qe3-c1 Kh6-h5 g2-g3 Rh4-h3 Kg1-g2 g5-g4 Qc1-f4 g6-g5 Qf4xf5 Nh8-g6 Qf5-c8 Bg8-h7 Qc8-e8 Ng6-h4+ g3xh4 Kh5xh4 Qe8-h8 Rh3-g3+ Kg2-f1 Rg3-f3+ Kf1-e2 Kh4-g3 Qh8xh7 Rf3xf6 Qh7-d3+ Rf6-f3
26/63 33:18 24,333,504k 12,173k +0.56 Qf3-f1 Kh5-h6 Qf1-g1 e4-e3 Qg1xe3 f5-f4 Qe3-e8 Rg4xg3+ Kh3-h2 g5-g4 Qe8xh8 Rg3-d3 Kh2-g1 Kh6-g5 Qh8xh7 g4-g3 Kg1-f1 f4-f3 g2xf3 Rd3xf3+ Kf1-g2 Rf3xf6 Kg2xg3 Rf6-f4 Qh7-g8 Rf4-g4+ Kg3-f2 Rg4-d4
26/55 33:18 24,333,504k 12,173k +0.77 Qf3-f2 e4-e3 Qf2-f3 Kh5-h6 Kh3-h2 e3-e2 Qf3xe2 Rg4-e4 Qe2-d2 Re4-e6 Qd2-d8 g5-g4 Qd8xh8 Kh6-g5 Qh8-g7 Bh7-g8 Qg7xg8 Kg5xf6 Kh2-g1 Re6-e4 Kg1-f2 Re4-e6 Qg8-f8 Re6-e4 Qf8-h8+ Kf6-e7 Qh8-c8 Ke7-f6 Qc8-c3+ Kf6-e6 Qc3-b3+ Ke6-f6 Qb3-b2+ Kf6-e7 Kf2-g1 Re4-e6 Qb2-b4+ Ke7-f6
26/38 33:18 24,333,504k 12,173k +5.97 Qf3-e3 Rg4-f4 g3xf4 g5-g4+ Kh3-g3 g6-g5 Qe3-c1 g5xf4+ Qc1xf4 Kh5-g6 Kg3-f2 Kg6xf6 Qf4-h6+ Nh8-g6 Qh6xh7 Kf6-e6 g2-g3 Ng6-e7 Qh7-h6+ Ke6-e5 Qh6-h8+ f7-f6 Qh8-e8 Ke5-d6 Qe8-d8+ Kd6-e6
26/64 33:18 24,333,504k 12,173k +59.28 Qf3-d1 e4-e3 Kh3-h2 Bh7-g8 Qd1-f3 Bg8-h7 Qf3-e2 Bh7-g8 Qe2-d1 Bg8-h7 Qd1-f3 Bh7-g8 Qf3-e2 Bg8-h7 Qe2xe3 Rg4-b4 Qe3-e8 g5-g4 Qe8xh8 Kh5-g5 Qh8xh7 Kg5xf6 Qh7-h8+ Kf6-e6 Qh8-e8+ Ke6-d5 Qe8xf7+ Kd5-d4 Qf7xg6 Kd4-e5 Qg6-e8+ Ke5-f6
26/107 33:18 24,333,504k 12,173k +59.28 Qf3-e2 e4-e3 Kh3-h2 Bh7-g8 Qe2-d1 Bg8-h7 Qd1-f3 Bh7-g8 Qf3-e2 Bg8-h7 Qe2xe3 Rg4-b4 Qe3-e8 g5-g4 Qe8xh8 Kh5-g5 Qh8xh7 Kg5xf6 Qh7-h8+ Kf6-e6 Qh8-e8+ Ke6-d5 Qe8xf7+ Kd5-d4 Qf7xg6 Kd4-e5 Qg6-e8+ Ke5-d4 Qe8-f7 Rb4-b5 Qf7-f6+ Rb5-e5 Kh2-g1 Kd4-e4 Qf6-d6 f5-f4 Qd6-b4+ Ke4-f5
26/48 33:18 24,333,504k 12,173k +M24 Qf3xg4+ f5xg4+ Kh3-h2 e4-e3 Kh2-g1 e3-e2 Kg1-f2 e2-e1R Kf2xe1 Bh7-g8 Ke1-f2 Bg8-h7 Kf2-e3 Kh5-h6 Ke3-e4 Kh6-h5 Ke4-d4 Kh5-h6 Kd4-d5 Bh7-g8 Kd5-d6 Bg8-h7 Kd6-e7 Bh7-g8 Ke7-e8 Kh6-h5 Ke8-f8 Bg8-h7 Kf8-g7 Bh7-g8 Kg7xg8 Kh5-h6 Kg8xh8 Kh6-h5 Kh8-g8 Kh5-h6 Kg8xf7 Kh6-h7 Kf7-e7 Kh7-g8 f6-f7+ Kg8-g7 f7-f8R Kg7-h7 Ke7-f6 Kh7-h6 Rf8-h8+
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27/31 1:32:49 77,522,949k 13,920k 0.00 Qf3-a3 f5-f4 Qa3-f8 Rg4xg3+ Kh3-h2 e4-e3 Qf8xh8 e3-e2 Qh8xh7+ Kh5-g4 Qh7xf7 e2-e1Q Qf7-d7+ Kg4-h5 Qd7-h7+ Kh5-g4
27/55 1:32:49 77,522,949k 13,920k 0.00 Qf3-c3 f5-f4 Qc3-c8 Rg4xg3+ Kh3-h2 e4-e3 Qc8xh8 e3-e2 Qh8xh7+ Kh5-g4 Qh7xf7 Rg3-e3 Qf7-d7+ Kg4-h4 Qd7-h7+ Kh4-g4
27/61 1:32:49 77,522,949k 13,920k +0.21 Qf3-b3 e4-e3 Qb3-d3 Rg4-e4 g3-g4+ Kh5-h6 Kh3-h2 Re4xg4 Qd3xe3 Rg4-h4+ Kh2-g1 Bh7-g8 Qe3-e8 g5-g4 Qe8xg8 Kh6-g5 Qg8-b8 Rh4-h7 Qb8-d6 g4-g3 Qd6xg3+ Kg5xf6 Qg3-c3+ Kf6-e7 Qc3-c5+ Ke7-f6 Qc5-d4+ Kf6-e7 Qd4-b4+ Ke7-f6 Qb4-b2+ Kf6-e7 Qb2-a3+ Ke7-f6
27/62 1:32:49 77,522,949k 13,920k +0.48 Qf3-f1 Kh5-h6 Qf1-g1 e4-e3 Qg1xe3 f5-f4 Qe3-e8 Rg4xg3+ Kh3-h2 g5-g4 Qe8xh8 Rg3-d3 Kh2-g1 Kh6-g5 Qh8xh7 g4-g3 Kg1-f1 f4-f3 g2xf3 Rd3xf3+ Kf1-g2 Rf3xf6 Kg2xg3 Rf6-f4 Qh7-g8 Rf4-g4+ Kg3-f2 Rg4-f4+ Kf2-e3 f7-f5 Qg8-d8+ Kg5-g4 Qd8-f6 Rf4-e4+ Ke3-d3 Kg4-h5 Qf6-g7 Kh5-g5 Qg7-g8 Re4-g4 Kd3-c2 Kg5-f6
27/88 1:32:49 77,522,949k 13,920k +0.71 Qf3-f2 e4-e3 Qf2-f3 Kh5-h6 Kh3-h2 e3-e2 Qf3xe2 Rg4-e4 Qe2-d2 Re4-e6 Qd2-d8 g5-g4 Qd8xh8 Kh6-g5 Qh8-g7 Bh7-g8 Qg7xg8 Kg5xf6 Kh2-g1 Re6-e4 Kg1-f2 Re4-e6 Qg8-h8+ Kf6-e7 Qh8-b8 Ke7-f6
27/94 1:32:49 77,522,949k 13,920k +6.00 Qf3-e3 Rg4-f4 g3xf4 g5-g4+ Kh3-g3 g6-g5 Qe3-c1 g5xf4+ Qc1xf4 Kh5-g6 Kg3-f2 Kg6xf6 Qf4-h6+ Nh8-g6 Qh6xh7 Kf6-e6 g2-g3 Ng6-e7 Qh7-h8 f7-f6 Qh8-b8 Ke6-d7 Qb8-a7+ Kd7-e6 Qa7-c7 Ne7-d5 Qc7-c8+ Ke6-d6 Qc8xf5
27/84 1:32:49 77,522,949k 13,920k +59.28 Qf3-d1 e4-e3 Kh3-h2 Bh7-g8 Qd1-f3 Bg8-h7 Qf3-e2 Bh7-g8 Qe2-d1 Bg8-h7 Qd1-f3 Bh7-g8 Qf3-e2 Bg8-h7 Qe2xe3 Rg4-b4 Qe3-e8 g5-g4 Qe8xh8 Kh5-g5 Qh8xh7 Kg5xf6 Qh7-h8+ Kf6-e6 Qh8-e8+ Ke6-d5 Qe8xf7+ Kd5-d4 Qf7-d7+
27/164 1:32:49 77,522,949k 13,920k +81.80 Qf3-e2 e4-e3 Kh3-h2 Bh7-g8 Qe2-d1 Bg8-h7 Qd1-f3 Bh7-g8 Qf3-e2 Bg8-h7 Qe2-d1 Bh7-g8 Qd1-f3 Bg8-h7 Qf3xe3 Rg4-b4 Qe3-e8 g5-g4 Qe8xh8 Kh5-g5 Qh8xh7 Kg5xf6 Qh7-h8+ Kf6-e6 Qh8-e8+ Ke6-d5 Qe8xf7+ Kd5-d4 Qf7xg6 f5-f4
27/48 1:32:49 77,522,949k 13,920k +M24 Qf3xg4+ f5xg4+ Kh3-h2 e4-e3 Kh2-g1 e3-e2 Kg1-f2 e2-e1R Kf2xe1 Bh7-g8 Ke1-f2 Bg8-h7 Kf2-e3 Kh5-h6 Ke3-e4 Kh6-h5 Ke4-d4 Kh5-h6 Kd4-d5 Bh7-g8 Kd5-d6 Bg8-h7 Kd6-e7 Bh7-g8 Ke7-e8 Kh6-h5 Ke8-f8 Bg8-h7 Kf8-g7 Bh7-g8 Kg7xg8 Kh5-h6 Kg8xh8 Kh6-h5 Kh8-g8 Kh5-h6 Kg8xf7 Kh6-h7 Kf7-e7 Kh7-g8 f6-f7+ Kg8-g7 f7-f8R Kg7-h7 Ke7-f6 Kh7-h6 Rf8-h8+

Joerg Oster · Post by **Joerg Oster** » Tue Aug 04, 2026 11:15 am

This seems to be too optimistic.

After the first two half-moves, Qxg4+ fxg4+, Matefish can't find a Mate in 21.

Code: Select all

info string Failure! No mate in 21 found!
info time 3254 multipv 1 depth 41 seldepth 41 nodes 12642561 nps 3885236 hashfull 13 tbhits 0 score cp 0 pv h3h2
bestmove h3h2

But it does confirm a Mate in 22:

Code: Select all

info string Success! Mate in 22 found!
info time 11374 multipv 1 depth 43 seldepth 43 nodes 42112165 nps 3702493 hashfull 43 tbhits 0 score mate 22 pv h3h2 h7g8 h2g1 g8h7 g1f2 e4e3 f2e3 h7g8 e3e2 g8h7 e2d3 h7g8 d3e4 g8h7 e4e5 h7g8 e5d6 g8h7 d6e7 h7g8 e7f8 g8h7 f8g7 h7g8 g7g8 h5h6 g8h8 h6h5 h8g8 h5h6 g8f7 h6h5 f7e6 h5h6 f6f7 h6h5 f7f8r h5h6 f8g8 h6h7 e6f7 h7h6 g8h8
bestmove h3h2 ponder h7g8

Pushing the pawn immediately after Kh3-h2 doesn't seem to be the best play for Black.

Joerg Oster · Post by **Joerg Oster** » Tue Aug 04, 2026 1:39 pm

Joerg Oster wrote: ↑Tue Aug 04, 2026 11:15 am This seems to be too optimistic.

After the first two half-moves, Qxg4+ fxg4+, Matefish can't find a Mate in 21.
Code: Select all
info string Failure! No mate in 21 found!
info time 3254 multipv 1 depth 41 seldepth 41 nodes 12642561 nps 3885236 hashfull 13 tbhits 0 score cp 0 pv h3h2
bestmove h3h2
But it does confirm a Mate in 22:
Code: Select all
info string Success! Mate in 22 found!
info time 11374 multipv 1 depth 43 seldepth 43 nodes 42112165 nps 3702493 hashfull 43 tbhits 0 score mate 22 pv h3h2 h7g8 h2g1 g8h7 g1f2 e4e3 f2e3 h7g8 e3e2 g8h7 e2d3 h7g8 d3e4 g8h7 e4e5 h7g8 e5d6 g8h7 d6e7 h7g8 e7f8 g8h7 f8g7 h7g8 g7g8 h5h6 g8h8 h6h5 h8g8 h5h6 g8f7 h6h5 f7e6 h5h6 f6f7 h6h5 f7f8r h5h6 f8g8 h6h7 e6f7 h7h6 g8h8
bestmove h3h2 ponder h7g8
Pushing the pawn immediately after Kh3-h2 doesn't seem to be the best play for Black.

Hmm, maybe I need to take a closer look at Matefish again.

Huntsman also confirms the Mate in 22.

Code: Select all

position fen 7n/5p1b/5Pp1/5ppk/4p1r1/5QPK/6P1/8 w - - 0 1
go movetime 30000
info depth 46 seldepth 44 multipv 1 score mate 22 nodes 50280341 nps 2045829 hashfull 109 tbhits 0 time 24577 pv f3g4 f5g4 h3h2 e4e3 h2g1 e3e2 g1f2 e2e1q f2e1 h7g8 e1d2 h5h6 d2e3 h6h5 e3d4 g8h7 d4e5 h7g8 e5d6 g8h7 d6e7 h5h6 e7f8 h6h5 f8g7 h7g8 g7g8 h5h6 g8h8 h6h5 h8g8 h5h6 g8f7 h6h7 f7e7 h7h8 f6f7 h8g7 f7f8r g7h6 f8f7 h6h5 f7h7
bestmove f3g4 ponder f5g4

Problem: when an extra bishop harms.

Problem: when an extra bishop harms.

Re: Problem: when an extra bishop harms.

Re: Problem: when an extra bishop harms.

Re: Problem: when an extra bishop harms.

Re: Problem: when an extra bishop harms.

Re: Problem: when an extra bishop harms.

Re: Problem: when an extra bishop harms.

Re: Problem: when an extra bishop harms.

Re: Problem: when an extra bishop harms.

Re: Problem: when an extra bishop harms.