1.g4 opening is losing?

[Ovyron]

Ah yes, I was talking about how moves like a4/b4/c4 weren't found by the engine and the human had to make them manually, and they were the fastest mates, on the other thread. Glad to see this remains true in faster hardware

[Uri Blass]

Ah yes, I was talking about how moves like a4/b4/c4 weren't found by the engine and the human had to make them manually, and they were the fastest mates, on the other thread. Glad to see this remains true in faster hardware

a4 get pruned

Even with 20 options and slow hardware I get no a4 as one of the best 20 options.

Note that from experience another type of moves that stockfish sometimes does not find is king moves when the king need to get closer to the opponent king for fastest mate.


FEN: 2b5/6p1/2N2k2/1R6/5B2/3p4/P1P5/2K5 w - - 0 48

Stockfish_20030109_x64_modern:
---------------------------------------------------------------------------
65/40 50:52 17,352,902k 5,685k +M20 48.Be3 Ba6 49.Bg5+ Kg6 50.Ra5 Bb7 51.Bf4 Bxc6 52.Ra6 Kf5 53.Rxc6 Kxf4 54.Rg6 dxc2 55.Rxg7 Kf5 56.Rc7 Ke5 57.Rxc2 Kf6 58.a4 Kf5 59.a5 Ke5 60.a6 Kd4 61.a7 Ke5 62.a8Q Kd4 63.Qf3 Ke5 64.Rc6 Kd4 65.Qf5 Ke3 66.Rd6 Ke2 67.Re6+
65/40 50:52 17,352,902k 5,685k +M20 48.Bd2 Ba6 49.Ra5 Bc8 50.cxd3 Bh3 51.Bf4 Kf7 52.Nd4 Kg6 53.Rc5 Kf7 54.Be5 g5 55.Rc7+ Kg6 56.Rg7+ Kh5 57.Bf6 Kg4 58.Bxg5 Kg3 59.Bd2+ Bg4 60.Rg5 Kh3 61.Bf4 Bd7 62.Kd2 Bg4 63.Ke3 Kg2 64.Rxg4+ Kh1 65.Rg3 Kh2 66.Nf3+ Kh1 67.Rg1+
65/40 50:52 17,352,902k 5,685k +M20 48.Rh5 Kg6 49.Rd5 Bh3 50.cxd3 Kf6 51.Nd4 Kf7 52.Rd6 Bg2 53.Be5 Bh3 54.Ra6 g5 55.Ra7+ Kg6 56.Rg7+ Kh5 57.Bf6 Kg4 58.Bxg5 Kg3 59.Bd2+ Bg4 60.Rg5 Kh3 61.Bf4 Bd7 62.Kd2 Bg4 63.Ke3 Kg2 64.Rxg4+ Kh1 65.Rg3 Kh2 66.Nf3+ Kh1 67.Rg1+
65/40 50:52 17,352,902k 5,685k +M20 48.Rb2 Bh3 49.Nd4 d2+ 50.Kxd2 Ke7 51.Rb7+ Kf6 52.Rb6+ Kf7 53.Be5 Bc8 54.Rc6 Bd7 55.Rc7 Ke8 56.Bxg7 Ke7 57.Bf6+ Kd6 58.Be5+ Kxe5 59.Rxd7 Kf4 60.a4 Ke4 61.a5 Kf4 62.a6 Kg5 63.a7 Kg6 64.a8Q Kg5 65.Qe4 Kh5 66.Rh7+ Kg5 67.Qf5+
65/38 50:52 17,352,902k 5,685k +M19 48.Kd2 dxc2 49.Nd4 Ke7 50.Rc5 Bh3 51.Be5 Kd8 52.Bxg7 c1Q+ 53.Kxc1 Ke7 54.Be5 Bd7 55.Rc7 Kd8 56.Rb7 Ke8 57.Bf6 Kf7 58.Rxd7+ Kxf6 59.a4 Kg5 60.a5 Kg6 61.a6 Kf6 62.a7 Kg5 63.a8Q Kf6 64.Qf8+ Kg6 65.Rg7+ Kh6 66.Qh8+
65/38 50:52 17,352,902k 5,685k +M19 48.Rb1 Bf5 49.Be5+ Kg5 50.Bxg7 Be4 51.Rb5+ Kg6 52.cxd3 Bh1 53.Be5 Kg5 54.Nd4 Bg2 55.Ra5 Bh3 56.Ra7 Bf5 57.Rg7+ Bg6 58.Rg8 Kh6 59.Bf6 Bxd3 60.Nf3 Bc4 61.Rg5 Bxa2 62.Ne5 Be6 63.Rg2 Bh3 64.Rh2 Kh7 65.Rxh3+ Kg8 66.Rh8+
65/38 50:52 17,352,902k 5,685k +M19 48.Rg5 Be6 49.Ra5 Bc4 50.cxd3 Bxd3 51.Be5+ Kg6 52.Ra3 Bf1 53.Rg3+ Kf5 54.Rf3+ Ke4 55.Rxf1 Kd5 56.Bxg7 Kxc6 57.Rf6+ Kb7 58.Rg6 Kc8 59.a4 Kc7 60.a5 Kd7 61.a6 Kc8 62.Be5 Kd7 63.a7 Ke7 64.a8Q Kd7 65.Qb7+ Ke8 66.Rg8+
65/38 50:52 17,352,902k 5,685k +M19 48.Rb4 Be6 49.cxd3 Bxa2 50.Rb5 Be6 51.Be5+ Kg5 52.Bxg7+ Kg6 53.Rb7 Kg5 54.Nd4 Bc8 55.Ra7 Kf4 56.Rf7+ Kg5 57.Be5 Bg4 58.Rg7+ Kh4 59.Kd2 Kh3 60.Bf4 Kh4 61.Rg5 Kh3 62.Ke3 Kh4 63.Nf3+ Kh3 64.Rg6 Bxf3 65.Kxf3 Kh4 66.Rh6+
65/38 50:52 17,352,902k 5,685k +M19 48.Rb8 Be6 49.cxd3 Bxa2 50.Rb5 Be6 51.Be5+ Kg5 52.Bxg7+ Kg6 53.Rb7 Kg5 54.Nd4 Bc8 55.Ra7 Kf4 56.Rf7+ Kg5 57.Be5 Bg4 58.Rg7+ Kh4 59.Kd2 Kh3 60.Bf4 Kh4 61.Rg5 Kh3 62.Ke3 Kh4 63.Nf3+ Kh3 64.Rg6 Bxf3 65.Kxf3 Kh4 66.Rh6+
65/38 50:52 17,352,902k 5,685k +M19 48.Rb3 Bf5 49.cxd3 Be6 50.Rb5 Bd7 51.Be5+ Kf7 52.Rb7 Ke6 53.Nd4+ Kxe5 54.Rxd7 Kf6 55.a4 g5 56.Rb7 Kg6 57.a5 g4 58.Rb2 g3 59.a6 Kf6 60.a7 g2 61.Rxg2 Ke5 62.Rg4 Kd6 63.a8Q Ke7 64.Qb7+ Kd6 65.Rg6+ Kc5 66.Nb3+
65/38 50:52 17,352,902k 5,685k +M19 48.Bg3 Bd7 49.Be5+ Kf7 50.Rb7 Ke6 51.Nd4+ Kxe5 52.Rxd7 g5 53.cxd3 g4 54.Rg7 g3 55.Rxg3 Kxd4 56.Rg5 Ke3 57.a4 Kf4 58.Rb5 Ke3 59.a5 Kxd3 60.a6 Kc4 61.Rg5 Kb3 62.a7 Kc4 63.a8Q Kd3 64.Qf3+ Kd4 65.Kd2 Kc4 66.Qc3+
65/38 50:52 17,352,902k 5,685k +M19 48.Rd5 Bh3 49.cxd3 Kg6 50.Nd4 Bf1 51.Rd6+ Kf7 52.Be5 Bh3 53.Ra6 g5 54.Ra7+ Kg6 55.Rg7+ Kh5 56.Bf6 Kg4 57.Bxg5 Kg3 58.Bd2+ Bg4 59.Rg5 Kh3 60.Bf4 Bd7 61.Kd2 Bg4 62.Ke3 Kg2 63.Rxg4+ Kh1 64.Rg3 Kh2 65.Nf3+ Kh1 66.Rg1+
65/38 50:52 17,352,902k 5,685k +M19 48.Re5 Bh3 49.Nd4 d2+ 50.Kxd2 Kf7 51.Rc5 Kg6 52.Rc3 Bf1 53.Be5 Kh6 54.Rf3 Bc4 55.Rh3+ Kg6 56.Rg3+ Kf7 57.Rxg7+ Kf8 58.a4 Ke8 59.Bf6 Bd5 60.a5 Bf7 61.a6 Kd7 62.a7 Kc7 63.Rxf7+ Kb6 64.a8Q Kc5 65.Rc7+ Kb4 66.c3+
65/38 50:52 17,352,902k 5,685k +M19 48.Ra5 d2+ 49.Kxd2 Ke6 50.Rc5 Bd7 51.Nd4+ Kf7 52.Rc7 Ke7 53.Be5 g6 54.Bf4 Kd8 55.Nc6+ Ke8 56.Bg5 Bxc6 57.Rxc6 Kd7 58.Rxg6 Kc7 59.a4 Kd7 60.a5 Kc8 61.Rg7 Kb8 62.Bf4+ Ka8 63.Be3 Kb8 64.a6 Kc8 65.a7 Kd8 66.a8Q+
65/36 50:52 17,352,902k 5,685k +M18 48.Rc5 Bh3 49.cxd3 Kf7 50.Nd4 Kg6 51.Rc6+ Kh5 52.Rc7 g5 53.Rh7+ Kg4 54.Be3 Kg3 55.Bxg5 Bf1 56.Rg7 Bh3 57.Bd2+ Bg4 58.Rg5 Kh3 59.Bf4 Bd7 60.Kd2 Bg4 61.Ke3 Kg2 62.Rxg4+ Kh1 63.Rg3 Kh2 64.Nf3+ Kh1 65.Rg1+
65/36 50:52 17,352,902k 5,685k +M18 48.Bg5+ Kf7 49.Ne5+ Ke6 50.Rb8 Ba6 51.Rb6+ Kf5 52.Rxa6 Kxg5 53.cxd3 Kf4 54.Ra5 Kf5 55.a4 Ke6 56.Rb5 g5 57.a5 g4 58.Nxg4 Ke7 59.Ne5 Ke6 60.a6 Ke7 61.a7 Kd6 62.a8Q Ke7 63.Qc6 Kf8 64.Rb8+ Kg7 65.Qg6+
65/36 50:52 17,352,902k 5,685k +M18 48.Rb6 d2+ 49.Kxd2 Bh3 50.Nd4+ Kf7 51.Be5 Bc8 52.Rc6 Bd7 53.Rc7 Ke8 54.Bxg7 Ke7 55.Bf6+ Kd6 56.Be5+ Kxe5 57.Rxd7 Kf4 58.a4 Ke4 59.a5 Kf4 60.a6 Kg5 61.a7 Kg6 62.a8Q Kg5 63.Qe4 Kh5 64.Rh7+ Kg5 65.Qf5+
65/36 50:52 17,352,902k 5,685k +M18 48.Nd4 d2+ 49.Kxd2 Ke7 50.Rc5 Bh3 51.Be5 Kd8 52.Bxg7 Ke7 53.Be5 Bd7 54.Rc7 Kd8 55.Ra7 Ke8 56.Bf6 Kf7 57.Rxd7+ Kxf6 58.a4 Kg6 59.a5 Kf6 60.a6 Kg5 61.a7 Kg6 62.a8Q Kg5 63.Qe4 Kh5 64.Rh7+ Kg5 65.Qf5+
65/34 50:52 17,352,902k 5,685k +M17 48.Be5+ Kf7 49.cxd3 Ba6 50.Rc5 Bxd3 51.Nd4 g5 52.Rc7+ Kg6 53.Rg7+ Kh5 54.Bf6 Bg6 55.Nc6 Kg4 56.Rxg6 Kf5 57.Ne7+ Kf4 58.Bxg5+ Ke4 59.Kd2 Kd4 60.Rc6 Ke5 61.Be3 Ke4 62.Ke2 Ke5 63.a3 Ke4 64.Re6+
65/34 50:52 17,352,902k 5,685k +M17 48.cxd3 Kf7 49.Nd4 Ba6 50.Rc5 Bxd3 51.Be5 g5 52.Rc7+ Kg6 53.Rg7+ Kh5 54.Bf6 Bg6 55.Nc6 Kg4 56.Rxg6 Kf5 57.Ne7+ Kf4 58.Bxg5+ Ke4 59.Kd2 Kd4 60.Rc6 Ke5 61.Be3 Ke4 62.Ke2 Ke5 63.a3 Ke4 64.Re6+

[Ovyron]

a4 get pruned

a4's win is outside its horizon and it doesn't have a reason to extending it because the other moves lead to mate.

a4 is not the best move, nobody says fastest mates are the best moves, and it could be argued that slowest mates are more fun to play against someone that refuses to resign (specially if those slower mates can be played faster)

I think this proves my original complaint against the challenge, and Stockfish works as it's supposed to (making changes that allow it to find a4 wouldn't have any positive effect on its strength. All mates are equally good.)

[Uri Blass]

a4 get pruned

a4's win is outside its horizon and it doesn't have a reason to extending it because the other moves lead to mate.

a4 is not the best move, nobody says fastest mates are the best moves, and it could be argued that slowest mates are more fun to play against someone that refuses to resign (specially if those slower mates can be played faster)

I think this proves my original complaint against the challenge, and Stockfish works as it's supposed to (making changes that allow it to find a4 wouldn't have any positive effect on its strength. All mates are equally good.)

I do not agree and I do not think all mates are equally good.
Here is another example
Stockfish needed a lot of time to find e4 and not e3 and could not see it at depth<95(I used 1024 mbytes hash and 3 cores)
Note that chest with a single core was faster in seeing e4 is the only move that force mate in 8.


[d]1n2k3/8/8/8/8/8/PPPPPPPP/RNBQKBNR w KQ - 0 1


Stockfish_20030109_x64_modern:
1/1 00:00 62 31k +46.03 1.Nc3
2/2 00:00 195 98k +45.67 1.Nc3 Nc6
3/3 00:00 325 163k +45.85 1.Nc3 Nc6 2.Ne4
4/4 00:00 1k 516k +46.17 1.Nf3 Na6 2.Nc3
5/6 00:00 2k 789k +46.38 1.Nf3 Na6 2.Nc3 Nc5 3.Nd5
6/6 00:00 3k 1,040k +46.38 1.Nc3 Nc6 2.Nd5 Na5 3.Nf3 Nc4
7/12 00:00 14k 2,052k +90.38 1.e3 Kd8 2.Bb5 Kc8 3.Qg4+ Kc7
8/9 00:00 15k 2,138k +90.38 1.e3 Kd8 2.Bb5 Nd7 3.Bxd7 Kxd7 4.Nc3 Ke6
9/9 00:00 16k 2,355k +90.56 1.e3 Kd8 2.Bb5 Nd7 3.Bxd7 Kxd7 4.Ke2 Ke6 5.Kd3
10/12 00:00 23k 2,575k +90.47 1.e3 Kd7 2.Qg4+ Kc7 3.Bb5 Kb7 4.Nc3 Nc6 5.Bxc6+ Kxc6 6.Ke2
11/13 00:00 28k 2,791k +90.52 1.e3 Kd7 2.Bb5+ Kc7 3.Nc3 Kb7 4.Qf3+ Kb6 5.Qf7 Nc6 6.Bxc6 Kxc6 7.Ke2
12/18 00:00 48k 2,675k +90.66 1.e3 Nd7 2.Bb5 Ke7 3.Bxd7 Kxd7 4.Ke2 Ke6 5.Kd3 Kd6 6.Ke4 Ke7
13/14 00:00 54k 2,725k +90.66 1.e3 Nd7 2.Bb5 Ke7 3.Bxd7 Kxd7 4.Ke2 Ke6 5.Kd3 Kd6 6.Ke4 Ke6 7.Qg4+ Kd6
14/15 00:00 68k 2,952k +90.66 1.e3 Nd7 2.Bb5 Ke7 3.Bxd7 Kxd7 4.Ke2 Ke6 5.Kd3 Kd6 6.Ke4 Ke6 7.Qg4+ Kd6 8.Qf3
15/20 00:00 87k 2,998k +90.66 1.e3 Nd7 2.Bb5 Ke7 3.Bxd7 Kxd7 4.Ke2 Ke6 5.Kd3 Kd6 6.Ke4 Ke6 7.Qg4+ Kd6 8.Qf3 Ke6
16/16 00:00 101k 3,154k +90.70 1.e3 Nd7 2.Bb5 Ke7 3.Bxd7 Kxd7 4.Ke2 Ke6 5.Kd3 Kd6 6.Ke4 Ke6 7.Qf3 Kd6 8.Qf7 Kc6
17/17 00:00 123k 3,009k +90.75 1.e3 Nd7 2.Bb5 Ke7 3.Bxd7 Kxd7 4.Ke2 Ke6 5.Kd3 Kd6 6.Ke4 Ke6 7.Qh5 Kd6 8.Qf5 Kc6 9.Qe5
18/18 00:00 135k 2,942k +90.75 1.e3 Nd7 2.Bb5 Ke7 3.Bxd7 Kxd7 4.Ke2 Ke6 5.Kd3 Kd6 6.Ke4 Ke6 7.Qh5 Kd6 8.Qf5 Kc6 9.Qe5 Kd7
19/19 00:00 171k 3,061k +90.75 1.e3 Nd7 2.Bb5 Ke7 3.Bxd7 Kxd7 4.Ke2 Ke6 5.Kd3 Kd6 6.Ke4 Ke6 7.Qh5 Kd6 8.Qf5 Kc6 9.Qe5 Kd7 10.Kd5
20/22 00:00 339k 3,354k +94.48 1.e3 Kd7 2.Qf3 Kc7 3.Bb5 Kc8 4.Nc3 Kc7 5.Qa8 Kc8 6.Ba6+ Kc7 7.Qa7+ Kd6 8.Qxb8+ Ke6 9.Ke2 Ke7 10.Kf3 Kf7 11.Nb1
21/26 00:00 473k 3,403k +101.38 1.e3 Kd7 2.Qf3 Kc7 3.Bb5 Kb6 4.Qa8 Kxb5 5.Qxb8+ Kc6 6.Ke2 Kc5 7.a4 Kc6 8.a5 Kd7 9.a6 Kc6
22/26 00:00 541k 3,218k +M19 1.e3 Kd7 2.Qf3 Kc7 3.Bb5 Kb6 4.Qa8 Kc7 5.Ke2 Kc8 6.Ba6+ Kc7 7.Qa7+ Kd6 8.Qxb8+ Ke6 9.Bb5 Kf6 10.Qd6+ Kf7 11.Qe5 Kg6 12.a4
23/28 00:00 1,183k 3,651k +M11 1.e3 Nd7 2.Bb5 Ke7 3.Bxd7 Kxd7 4.a4 Kd6 5.a5 Ke5 6.a6 Kd6 7.a7 Kc7 8.a8Q Kd7 9.Ra6 Kc7 10.Qdf3 Kd7 11.Qfb7+
24/22 00:00 1,185k 3,657k +M11 1.e3 Nd7 2.Bb5 Ke7 3.Bxd7 Kxd7 4.a4 Kd6 5.a5 Ke5 6.a6 Kd6 7.a7 Kc7 8.a8Q Kd7 9.Ra6 Kc7 10.Qdf3 Kd7 11.Qfb7+
25/22 00:00 1,194k 3,653k +M11 1.e3 Nd7 2.Bb5 Ke7 3.Bxd7 Kxd7 4.a4 Kd6 5.a5 Ke5 6.a6 Kd6 7.a7 Kc7 8.a8Q Kd7 9.Ra6 Kc7 10.Qdf3 Kd7 11.Qfb7+
26/22 00:00 1,208k 3,660k +M11 1.e3 Nd7 2.Bb5 Ke7 3.Bxd7 Kxd7 4.a4 Kd6 5.a5 Ke5 6.a6 Kd6 7.a7 Kc7 8.a8Q Kd7 9.Ra6 Kc7 10.Qdf3 Kd7 11.Qfb7+
27/22 00:00 1,335k 3,647k +M11 1.e3 Nd7 2.Bb5 Ke7 3.Bxd7 Kxd7 4.a4 Kd6 5.a5 Ke5 6.a6 Kd6 7.a7 Kc7 8.a8Q Kd7 9.Ra6 Kc7 10.Qdf3 Kd7 11.Qfb7+
28/22 00:00 1,475k 3,643k +M11 1.e3 Nd7 2.Bb5 Ke7 3.Bxd7 Kxd7 4.a4 Kd6 5.a5 Ke5 6.a6 Kd6 7.a7 Kc7 8.a8Q Kd7 9.Ra6 Kc7 10.Qdf3 Kd7 11.Qfb7+
29/22 00:00 1,983k 3,693k +M11 1.e3 Ke7 2.Bb5 Nd7 3.Bxd7 Kxd7 4.a4 Kd6 5.a5 Ke5 6.a6 Kd6 7.a7 Kc7 8.a8Q Kd7 9.Ra6 Kc7 10.Qdf3 Kd7 11.Qfb7+
30/22 00:00 2,078k 3,627k +M11 1.e3 Ke7 2.Bb5 Nd7 3.Bxd7 Kxd7 4.a4 Kd6 5.a5 Ke5 6.a6 Kd6 7.a7 Kc7 8.a8Q Kd7 9.Ra6 Kc7 10.Qdf3 Kd7 11.Qfb7+
31/22 00:00 2,105k 3,598k +M11 1.e3 Ke7 2.Bb5 Nd7 3.Bxd7 Kxd7 4.a4 Kd6 5.a5 Ke5 6.a6 Kd6 7.a7 Kc7 8.a8Q Kd7 9.Ra6 Kc7 10.Qdf3 Kd7 11.Qfb7+
32/22 00:00 2,127k 3,581k +M11 1.e3 Ke7 2.Bb5 Nd7 3.Bxd7 Kxd7 4.a4 Kd6 5.a5 Ke5 6.a6 Kd6 7.a7 Kc7 8.a8Q Kd7 9.Ra6 Kc7 10.Qdf3 Kd7 11.Qfb7+
33/22 00:00 2,227k 3,551k +M11 1.e3 Ke7 2.Bb5 Nd7 3.Bxd7 Kxd7 4.a4 Kd6 5.a5 Ke5 6.a6 Kd6 7.a7 Kc7 8.a8Q Kd7 9.Ra6 Kc7 10.Qdf3 Kd7 11.Qfb7+
34/22 00:00 2,329k 3,539k +M11 1.e3 Ke7 2.Bb5 Nd7 3.Bxd7 Kxd7 4.a4 Kd6 5.a5 Ke5 6.a6 Kd6 7.a7 Kc7 8.a8Q Kd7 9.Ra6 Kc7 10.Qdf3 Kd7 11.Qfb7+
35/22 00:00 2,788k 3,621k +M11 1.e3 Ke7 2.Bb5 Nd7 3.Bxd7 Kxd7 4.a4 Kd6 5.a5 Ke5 6.a6 Kd6 7.a7 Kc7 8.a8Q Kd7 9.Ra6 Kc7 10.Qdf3 Kd7 11.Qfb7+
36/22 00:00 2,953k 3,596k +M11 1.e3 Ke7 2.Bb5 Nd7 3.Bxd7 Kxd7 4.a4 Kd6 5.a5 Ke5 6.a6 Kd6 7.a7 Kc7 8.a8Q Kd7 9.Ra6 Kc7 10.Qdf3 Kd7 11.Qfb7+
37/22 00:00 3,199k 3,566k +M11 1.e3 Ke7 2.Bb5 Nd7 3.Bxd7 Kxd7 4.a4 Kd6 5.a5 Ke5 6.a6 Kd6 7.a7 Kc7 8.a8Q Kd7 9.Ra6 Kc7 10.Qdf3 Kd7 11.Qfb7+
38/22 00:00 3,485k 3,615k +M11 1.e3 Ke7 2.Bb5 Nd7 3.Bxd7 Kxd7 4.a4 Kd6 5.a5 Ke5 6.a6 Kd6 7.a7 Kc7 8.a8Q Kd7 9.Ra6 Kc7 10.Qdf3 Kd7 11.Qfb7+
39/22 00:01 4,332k 3,837k +M11 1.e3 Ke7 2.Bb5 Nd7 3.Bxd7 Kxd7 4.a4 Kd6 5.a5 Ke5 6.a6 Kd6 7.a7 Kc7 8.a8Q Kd7 9.Ra6 Kc7 10.Qdf3 Kd7 11.Qfb7+
40/22 00:01 4,654k 3,908k +M11 1.e3 Ke7 2.Bb5 Nd7 3.Bxd7 Kxd7 4.a4 Kd6 5.a5 Ke5 6.a6 Kd6 7.a7 Kc7 8.a8Q Kd7 9.Ra6 Kc7 10.Qdf3 Kd7 11.Qfb7+
41/22 00:01 5,820k 4,154k +M11 1.e3 Ke7 2.Bb5 Nd7 3.Bxd7 Kxd7 4.a4 Kd6 5.a5 Ke5 6.a6 Kd6 7.a7 Kc7 8.a8Q Kd7 9.Ra6 Kc7 10.Qdf3 Kd7 11.Qfb7+
42/22 00:01 6,607k 4,208k +M11 1.e3 Ke7 2.Bb5 Nd7 3.Bxd7 Kxd7 4.a4 Kd6 5.a5 Ke5 6.a6 Kd6 7.a7 Kc7 8.a8Q Kd7 9.Ra6 Kc7 10.Qdf3 Kd7 11.Qfb7+
43/22 00:01 8,191k 4,248k +M11 1.e3 Ke7 2.Bb5 Nd7 3.Bxd7 Kxd7 4.a4 Kd6 5.a5 Ke5 6.a6 Kd6 7.a7 Kc7 8.a8Q Kd7 9.Ra6 Kc7 10.Qdf3 Kd7 11.Qfb7+
44/22 00:02 13,683k 4,748k +M10 1.e3 Ke7 2.Qg4 Nd7 3.Qg7+ Ke6 4.b4 Kd6 5.Bb2 Kc6 6.Bb5+ Kxb5 7.Qxd7+ Ka6 8.Nf3 Kb6 9.Bd4+ Ka6 10.Qc6+
45/20 00:02 14,256k 4,770k +M10 1.e3 Ke7 2.Qg4 Nd7 3.Qg7+ Ke6 4.b4 Kd6 5.Bb2 Kc6 6.Bb5+ Kxb5 7.Qxd7+ Ka6 8.Nf3 Kb6 9.Bd4+ Ka6 10.Qc6+
46/20 00:03 14,817k 4,787k +M10 1.e3 Ke7 2.Qg4 Nd7 3.Qg7+ Ke6 4.b4 Kd6 5.Bb2 Kc6 6.Bb5+ Kxb5 7.Qxd7+ Ka6 8.Nf3 Kb6 9.Bd4+ Ka6 10.Qc6+
47/20 00:03 15,561k 4,819k +M10 1.e3 Ke7 2.Qg4 Nd7 3.Qg7+ Ke6 4.b4 Kd6 5.Bb2 Kc6 6.Bb5+ Kxb5 7.Qxd7+ Ka6 8.Nf3 Kb6 9.Bd4+ Ka6 10.Qc6+
48/20 00:03 16,339k 4,840k +M10 1.e3 Ke7 2.Qg4 Nd7 3.Qg7+ Ke6 4.b4 Kd6 5.Bb2 Kc6 6.Bb5+ Kxb5 7.Qxd7+ Ka6 8.Nf3 Kb6 9.Bd4+ Ka6 10.Qc6+
49/20 00:03 17,747k 4,881k +M10 1.e3 Ke7 2.Qg4 Nd7 3.Qg7+ Ke6 4.b4 Kd6 5.Bb2 Kc6 6.Bb5+ Kxb5 7.Qxd7+ Ka6 8.Nf3 Kb6 9.Bd4+ Ka6 10.Qc6+
50/20 00:03 18,165k 4,890k +M10 1.e3 Ke7 2.Qg4 Nd7 3.Qg7+ Ke6 4.b4 Kd6 5.Bb2 Kc6 6.Bb5+ Kxb5 7.Qxd7+ Ka6 8.Nf3 Kb6 9.Bd4+ Ka6 10.Qc6+
51/20 00:04 19,823k 4,921k +M10 1.e3 Ke7 2.Qg4 Nd7 3.Qg7+ Ke6 4.b4 Kd6 5.Bb2 Kc6 6.Bb5+ Kxb5 7.Qxd7+ Ka6 8.Nf3 Kb6 9.Bd4+ Ka6 10.Qc6+
52/20 00:04 21,093k 4,939k +M10 1.e3 Ke7 2.Qg4 Nd7 3.Qg7+ Ke6 4.b4 Kd6 5.Bb2 Kc6 6.Bb5+ Kxb5 7.Qxd7+ Ka6 8.Nf3 Kb6 9.Bd4+ Ka6 10.Qc6+
53/20 00:04 22,872k 4,994k +M10 1.e3 Ke7 2.Qg4 Nd7 3.Qg7+ Ke6 4.b4 Kd6 5.Bb2 Kc6 6.Bb5+ Kxb5 7.Qxd7+ Ka6 8.Nf3 Kb6 9.Bd4+ Ka6 10.Qc6+
54/20 00:05 28,393k 5,163k +M10 1.e3 Ke7 2.Qg4 Nd7 3.Qg7+ Ke6 4.b4 Kd6 5.Bb2 Kc6 6.Bb5+ Kxb5 7.Qxd7+ Ka6 8.Nf3 Kb6 9.Bd4+ Ka6 10.Qc6+
55/20 00:11 65,843k 5,981k +M9 1.e3 Ke7 2.Bb5 Nd7 3.Qg4 Nf6 4.Qg7+ Ke6 5.Nc3 Kd6 6.Qxf6+ Kc7 7.Qc6+ Kb8 8.Ba6 Ka7 9.Qb7+
56/18 00:11 69,274k 5,993k +M9 1.e3 Ke7 2.Bb5 Nd7 3.Qg4 Nf6 4.Qg7+ Ke6 5.Nc3 Kd6 6.Qxf6+ Kc7 7.Qc6+ Kb8 8.Ba6 Ka7 9.Qb7+
57/18 00:12 76,553k 6,011k +M9 1.e3 Ke7 2.Bb5 Nd7 3.Qg4 Nf6 4.Qg7+ Ke6 5.Nc3 Kd6 6.Qxf6+ Kc7 7.Qc6+ Kb8 8.Ba6 Ka7 9.Qb7+
58/18 00:13 82,373k 6,066k +M9 1.e3 Ke7 2.Bb5 Nd7 3.Qg4 Nf6 4.Qg7+ Ke6 5.Nc3 Kd6 6.Qxf6+ Kc7 7.Qc6+ Kb8 8.Ba6 Ka7 9.Qb7+
59/18 00:13 83,984k 6,059k +M9 1.e3 Ke7 2.Bb5 Nd7 3.Qg4 Nf6 4.Qg7+ Ke6 5.Nc3 Kd6 6.Qxf6+ Kc7 7.Qc6+ Kb8 8.Ba6 Ka7 9.Qb7+
60/18 00:15 92,355k 6,114k +M9 1.e3 Ke7 2.Bb5 Nd7 3.Qg4 Nf6 4.Qg7+ Ke6 5.Nc3 Kd6 6.Qxf6+ Kc7 7.Qc6+ Kb8 8.Ba6 Ka7 9.Qb7+
61/18 00:15 94,608k 6,124k +M9 1.e3 Ke7 2.Bb5 Nd7 3.Qg4 Nf6 4.Qg7+ Ke6 5.Nc3 Kd6 6.Qxf6+ Kc7 7.Qc6+ Kb8 8.Ba6 Ka7 9.Qb7+
62/18 00:16 101,267k 6,122k +M9 1.e3 Ke7 2.Bb5 Nd7 3.Qg4 Nf6 4.Qg7+ Ke6 5.Nc3 Kd6 6.Qxf6+ Kc7 7.Qc6+ Kb8 8.Ba6 Ka7 9.Qb7+
63/18 00:18 114,340k 6,135k +M9 1.e3 Ke7 2.Bb5 Nd7 3.Qg4 Nf6 4.Qg7+ Ke6 5.Nc3 Kd6 6.Qxf6+ Kc7 7.Qc6+ Kb8 8.Ba6 Ka7 9.Qb7+
64/18 00:20 122,995k 6,131k +M9 1.e3 Ke7 2.Bb5 Nd7 3.Qg4 Nf6 4.Qg7+ Ke6 5.Nc3 Kd6 6.Qxf6+ Kc7 7.Qc6+ Kb8 8.Ba6 Ka7 9.Qb7+
65/18 00:21 134,269k 6,117k +M9 1.e3 Ke7 2.Bb5 Nd7 3.Qg4 Nf6 4.Qg7+ Ke6 5.Nc3 Kd6 6.Qxf6+ Kc7 7.Qc6+ Kb8 8.Ba6 Ka7 9.Qb7+
66/18 00:24 151,745k 6,134k +M9 1.e3 Ke7 2.Bb5 Nd7 3.Qg4 Nf6 4.Qg7+ Ke6 5.Nc3 Kd6 6.Qxf6+ Kc7 7.Qc6+ Kb8 8.Ba6 Ka7 9.Qb7+
67/18 00:27 167,364k 6,116k +M9 1.e3 Ke7 2.Bb5 Nd7 3.Qg4 Nf6 4.Qg7+ Ke6 5.Nc3 Kd6 6.Qxf6+ Kc7 7.Qc6+ Kb8 8.Ba6 Ka7 9.Qb7+
68/18 00:31 191,650k 6,107k +M9 1.e3 Ke7 2.Bb5 Nd7 3.Qg4 Nf6 4.Qg7+ Ke6 5.Nc3 Kd6 6.Qxf6+ Kc7 7.Qc6+ Kb8 8.Ba6 Ka7 9.Qb7+
69/18 00:33 205,695k 6,108k +M9 1.e3 Ke7 2.Bb5 Nd7 3.Qg4 Nf6 4.Qg7+ Ke6 5.Nc3 Kd6 6.Qxf6+ Kc7 7.Qc6+ Kb8 8.Ba6 Ka7 9.Qb7+
70/18 00:39 238,457k 6,095k +M9 1.e3 Ke7 2.Bb5 Nd7 3.Qg4 Nf6 4.Qg7+ Ke6 5.Nc3 Kd6 6.Qxf6+ Kc7 7.Qc6+ Kb8 8.Ba6 Ka7 9.Qb7+
71/18 00:44 269,581k 6,094k +M9 1.e3 Ke7 2.Bb5 Nd7 3.Qg4 Nf6 4.Qg7+ Ke6 5.Nc3 Kd6 6.Qxf6+ Kc7 7.Qc6+ Kb8 8.Ba6 Ka7 9.Qb7+
72/18 00:49 298,139k 6,065k +M9 1.e3 Ke7 2.Bb5 Nd7 3.Qg4 Nf6 4.Qg7+ Ke6 5.Nc3 Kd6 6.Qxf6+ Kc7 7.Qc6+ Kb8 8.Ba6 Ka7 9.Qb7+
73/18 00:54 332,414k 6,071k +M9 1.e3 Ke7 2.Bb5 Nd7 3.Qg4 Nf6 4.Qg7+ Ke6 5.Nc3 Kd6 6.Qxf6+ Kc7 7.Qc6+ Kb8 8.Ba6 Ka7 9.Qb7+
74/18 01:01 375,313k 6,060k +M9 1.e3 Ke7 2.Bb5 Nd7 3.Qg4 Nf6 4.Qg7+ Ke6 5.Nc3 Kd6 6.Qxf6+ Kc7 7.Qc6+ Kb8 8.Ba6 Ka7 9.Qb7+
75/18 01:10 428,833k 6,060k +M9 1.e3 Ke7 2.Bb5 Nd7 3.Qg4 Nf6 4.Qg7+ Ke6 5.Nc3 Kd6 6.Qxf6+ Kc7 7.Qc6+ Kb8 8.Ba6 Ka7 9.Qb7+
76/18 01:15 460,015k 6,067k +M9 1.e3 Ke7 2.Bb5 Nd7 3.Qg4 Nf6 4.Qg7+ Ke6 5.Nc3 Kd6 6.Qxf6+ Kc7 7.Qc6+ Kb8 8.Ba6 Ka7 9.Qb7+
77/18 01:26 525,759k 6,081k +M9 1.e3 Ke7 2.Bb5 Nd7 3.Qg4 Nf6 4.Qg7+ Ke6 5.Nc3 Kd6 6.Qxf6+ Kc7 7.Qc6+ Kb8 8.Ba6 Ka7 9.Qb7+
78/18 01:37 590,556k 6,080k +M9 1.e3 Ke7 2.Bb5 Nd7 3.Qg4 Nf6 4.Qg7+ Ke6 5.Nc3 Kd6 6.Qxf6+ Kc7 7.Qc6+ Kb8 8.Ba6 Ka7 9.Qb7+
79/18 01:54 696,976k 6,095k +M9 1.e3 Ke7 2.Bb5 Nd7 3.Qg4 Nf6 4.Qg7+ Ke6 5.Nc3 Kd6 6.Qxf6+ Kc7 7.Qc6+ Kb8 8.Ba6 Ka7 9.Qb7+
80/18 02:07 774,902k 6,101k +M9 1.e3 Ke7 2.Bb5 Nd7 3.Qg4 Nf6 4.Qg7+ Ke6 5.Nc3 Kd6 6.Qxf6+ Kc7 7.Qc6+ Kb8 8.Ba6 Ka7 9.Qb7+
81/18 02:12 808,913k 6,110k +M9 1.e3 Ke7 2.Bb5 Nd7 3.Qg4 Nf6 4.Qg7+ Ke6 5.Nc3 Kd6 6.Qxf6+ Kc7 7.Qc6+ Kb8 8.Ba6 Ka7 9.Qb7+
82/18 02:33 942,473k 6,127k +M9 1.e3 Ke7 2.Bb5 Nd7 3.Qg4 Nf6 4.Qg7+ Ke6 5.Nc3 Kd6 6.Qxf6+ Kc7 7.Qc6+ Kb8 8.Ba6 Ka7 9.Qb7+
83/18 02:43 1,001,598k 6,134k +M9 1.e3 Ke7 2.Bb5 Nd7 3.Qg4 Nf6 4.Qg7+ Ke6 5.Nc3 Kd6 6.Qxf6+ Kc7 7.Qc6+ Kb8 8.Ba6 Ka7 9.Qb7+
84/18 03:02 1,124,967k 6,155k +M9 1.e3 Ke7 2.Bb5 Nd7 3.Qg4 Nf6 4.Qg7+ Ke6 5.Nc3 Kd6 6.Qxf6+ Kc7 7.Qc6+ Kb8 8.Ba6 Ka7 9.Qb7+
85/18 03:20 1,234,592k 6,170k +M9 1.e3 Ke7 2.Bb5 Nd7 3.Qg4 Nf6 4.Qg7+ Ke6 5.Nc3 Kd6 6.Qxf6+ Kc7 7.Qc6+ Kb8 8.Ba6 Ka7 9.Qb7+
86/18 03:34 1,328,214k 6,183k +M9 1.e3 Ke7 2.Bb5 Nd7 3.Qg4 Nf6 4.Qg7+ Ke6 5.Nc3 Kd6 6.Qxf6+ Kc7 7.Qc6+ Kb8 8.Ba6 Ka7 9.Qb7+
87/18 03:54 1,442,753k 6,159k +M9 1.e3 Ke7 2.Bb5 Nd7 3.Qg4 Nf6 4.Qg7+ Ke6 5.Nc3 Kd6 6.Qxf6+ Kc7 7.Qc6+ Kb8 8.Ba6 Ka7 9.Qb7+
88/18 04:14 1,557,145k 6,118k +M9 1.e3 Ke7 2.Bb5 Nd7 3.Qg4 Nf6 4.Qg7+ Ke6 5.Nc3 Kd6 6.Qxf6+ Kc7 7.Qc6+ Kb8 8.Ba6 Ka7 9.Qb7+
89/18 05:10 1,909,791k 6,157k +M9 1.e3 Ke7 2.Bb5 Nd7 3.Qg4 Nf6 4.Qg7+ Ke6 5.Nc3 Kd6 6.Qxf6+ Kc7 7.Qc6+ Kb8 8.Ba6 Ka7 9.Qb7+
90/18 05:34 2,069,133k 6,181k +M9 1.e3 Ke7 2.Bb5 Nd7 3.Qg4 Nf6 4.Qg7+ Ke6 5.Nc3 Kd6 6.Qxf6+ Kc7 7.Qc6+ Kb8 8.Ba6 Ka7 9.Qb7+
91/18 06:02 2,245,582k 6,192k +M9 1.e3 Ke7 2.Bb5 Nd7 3.Qg4 Nf6 4.Qg7+ Ke6 5.Nc3 Kd6 6.Qxf6+ Kc7 7.Qc6+ Kb8 8.Ba6 Ka7 9.Qb7+
92/18 06:58 2,581,665k 6,175k +M9 1.e3 Ke7 2.Bb5 Nd7 3.Qg4 Nf6 4.Qg7+ Ke6 5.Nc3 Kd6 6.Qxf6+ Kc7 7.Qc6+ Kb8 8.Ba6 Ka7 9.Qb7+
93/18 07:56 2,925,449k 6,137k +M9 1.e3 Ke7 2.Bb5 Nd7 3.Qg4 Nf6 4.Qg7+ Ke6 5.Nc3 Kd6 6.Qxf6+ Kc7 7.Qc6+ Kb8 8.Ba6 Ka7 9.Qb7+
94/18 08:44 3,206,095k 6,111k +M9 1.e3 Ke7 2.Bb5 Nd7 3.Qg4 Nf6 4.Qg7+ Ke6 5.Nc3 Kd6 6.Qxf6+ Kc7 7.Qc6+ Kb8 8.Ba6 Ka7 9.Qb7+
95/18 10:54 4,041,755k 6,171k +M8 1.e4 Nc6 2.Qh5+ Ke7 3.Qc5+ Kd7 4.d4 Nb4 5.Bb5+ Ke6 6.Qf5+ Ke7 7.Bg5+ Kd6 8.Qe5+

[Ovyron]

If it mattered then it'd be reflected on the score sheet, but the winning player gets 1 point no matter how many moves they took to mate, so at that point the game has been decided and it doesn't matter how you win it.

It may be interesting to create a chess variant where you get more points if you mate in fewer moves, in that one finding minimal mates would make sense. In chess it's extravagant.

[zullil]

After 48.a4 mate in 13 moves:

[d]2b5/6p1/2N2k2/1R6/P4B2/3p4/2P5/2K5 b - a3 0 48

Code: Select all

-M13	48. ... Bg4 49.a5 Be2 50.Rb6 d2+ 51.Kxd2 Bf1 52.a6 Bxa6 53.Rxa6 g5 54.Nd4+ Ke7 55.Bxg5+ Kd7 56.Ra7+ Kc8 57.Rg7 Kb8 58.Bf4+ Ka8 59.Rc7 Kb8 60.Nc6+ Ka8 61.Ra7+
-M13	48. ... Ke6 49.a5 Ba6 50.Rb6 g5 51.Bxg5 Bc4 52.cxd3 Bxd3 53.Nb4+ Kf5 54.Nxd3 Ke4 55.a6 Kxd3 56.a7 Ke4 57.a8Q+ Kf5 58.Rb5+ Kg4 59.Qg2+ Kh5 60.Bd2+ Kh4 61.Be1+
-M13	48. ... d2+ 49.Kxd2 Kf7 50.a5 Ke6 51.Rb6 g5 52.Na7+ Kf5 53.Nxc8 gxf4 54.a6 f3 55.Ke1 f2+ 56.Kxf2 Ke5 57.a7 Kd5 58.a8Q+ Ke5 59.Qa5+ Kd4 60.Rb5 Ke4 61.Qa4+
-M13	48. ... Be6 49.cxd3 Bg4 50.a5 Bc8 51.Rb6 g5 52.Nd4+ Kg7 53.a6 Bxa6 54.Be5+ Kf8 55.Rxa6 Kf7 56.Rb6 Kg8 57.Rb7 g4 58.Ne6 g3 59.Rg7+ Kh8 60.Rg6+ Kh7 61.Nf8+
-M13	48. ... Ba6 49.Rb6 Bc4 50.cxd3 Kf5 51.dxc4 Kxf4 52.a5 g5 53.a6 g4 54.a7 g3 55.a8Q g2 56.Qg8 g1Q+ 57.Qxg1 Kf5 58.Rb7 Kf6 59.Qg7+ Kf5 60.Rf7+ Ke6 61.Rf6+
-M13	48. ... Kf7 49.cxd3 Ke6 50.a5 g5 51.Bxg5 Kf7 52.Ne7 Ba6 53.Rb6 Bxd3 54.Rd6 Be4 55.Nc6 Bxc6 56.Rxc6 Kg7 57.a6 Kh7 58.a7 Kg7 59.a8Q Kf7 60.Qb7+ Ke8 61.Rc8+
-M13	48. ... Bh3 49.a5 Bc8 50.Bg5+ Kf7 51.cxd3 Ba6 52.Rb6 Kg6 53.Rxa6 Kxg5 54.Rb6 Kf6 55.a6 Ke6 56.a7 Kf5 57.a8Q Kf4 58.Nd4 Kg5 59.Qg2+ Kh5 60.Rg6 Kh4 61.Qg4+
-M13	48. ... Bd7 49.a5 Bc8 50.Bg5+ Kf7 51.cxd3 Ba6 52.Rb6 Kg6 53.Rxa6 Kxg5 54.Rb6 Kf6 55.a6 Ke6 56.a7 Kf5 57.a8Q Kf4 58.Nd4 Kg5 59.Qg2+ Kh5 60.Rg6 Kh4 61.Qg4+
-M13	48. ... g6 49.Bg5+ Ke6 50.a5 Bd7 51.Rb6 d2+ 52.Kxd2 Kf5 53.a6 Kg4 54.a7 Kxg5 55.Ne5 Bc6 56.Rxc6 Kf4 57.a8Q Kxe5 58.Qa4 Kf5 59.Qd4 Kg5 60.Rc5+ Kh6 61.Qh8+
-M13	48. ... g5 49.Bxg5+ Ke6 50.a5 Kf7 51.Rb6 d2+ 52.Kxd2 Kg6 53.Ne7+ Kxg5 54.Nxc8 Kg4 55.Rg6+ Kf4 56.Ne7 Ke5 57.a6 Ke4 58.a7 Kf4 59.a8Q Ke5 60.Qd5+ Kf4 61.Qf5+

Andreas

Confirmed:

Code: Select all

info depth 60 seldepth 27 multipv 1 score mate -13 nodes 3663742529 nps 94125540 hashfull 4 tbhits 0 time 38924 pv c8d7 a4a5 d3d2 c1d2 d7c8 b5b6 g7g5 c6d4 f6e7 a5a6 c8a6 f4g5 e7e8 b6a6 e8d7 a6a7 d7c8 g5f4 c8d8 a7c7 d8e8 f4d6 e8d8 d4e6 d8e8 c7e7
info depth 60 seldepth 27 multipv 2 score mate -13 nodes 3663742529 nps 94125540 hashfull 4 tbhits 0 time 38924 pv d3d2 c1d2 c8f5 b5b6 f5h3 a4a5 h3f1 a5a6 f1a6 b6a6 g7g5 c6d4 f6e7 f4g5 e7d7 a6a7 d7c8 g5f4 c8d8 a7c7 d8e8 f4d6 e8d8 d4e6 d8e8 c7e7
info depth 60 seldepth 27 multipv 3 score mate -13 nodes 3663742529 nps 94125540 hashfull 4 tbhits 0 time 38924 pv d3c2 f4g5 f6e6 b5b6 c8d7 c6b8 d7c6 b8c6 e6f5 a4a5 f5g5 a5a6 g5g4 b6b3 g4f4 a6a7 f4f5 a7a8q f5e6 b3b5 g7g5 a8d8 e6f7 b5g5 f7e6 d8e7
info depth 60 seldepth 27 multipv 4 score mate -13 nodes 3663742529 nps 94125540 hashfull 4 tbhits 0 time 38924 pv c8g4 c2d3 g7g5 f4g5 f6e6 a4a5 g4h3 a5a6 h3g2 a6a7 g2c6 b5b6 e6d5 b6c6 d5c6 a7a8q c6d7 a8a6 d7c7 d3d4 c7d7 a6b6 d7c8 d4d5 c8d7 b6c6
info depth 60 seldepth 27 multipv 5 score mate -13 nodes 3663742529 nps 94125540 hashfull 4 tbhits 0 time 38924 pv c8h3 c2d3 h3f5 b5b6 f5d7 a4a5 d7c8 a5a6 c8a6 c6d4 f6f7 b6a6 f7e7 f4g5 e7f7 d4f3 f7g8 f3e5 g8h8 a6a8 h8h7 d3d4 g7g6 g5f6 h7h6 a8h8
info depth 60 seldepth 27 multipv 6 score mate -13 nodes 3663742529 nps 94125540 hashfull 4 tbhits 0 time 38924 pv c8f5 a4a5 d3d2 f4d2 f5c8 d2c3 f6f7 b5b6 f7g6 c6e7 g6h5 e7c8 g7g6 a5a6 g6g5 a6a7 g5g4 a7a8q h5h4 b6b4 h4g3 a8h1 g3f2 c3e1 f2e3 b4e4
info depth 60 seldepth 27 multipv 7 score mate -13 nodes 3663742529 nps 94125540 hashfull 4 tbhits 0 time 38924 pv g7g6 c2d3 f6e6 b5b6 e6f5 c6e7 f5g4 e7c8 g4f4 a4a5 f4g4 b6g6 g4f5 c8e7 f5f4 c1d2 f4e5 a5a6 e5d4 a6a7 d4c5 a7a8q c5b4 a8b7 b4a5 g6a6
info depth 60 seldepth 27 multipv 8 score mate -13 nodes 3663742529 nps 94125540 hashfull 4 tbhits 0 time 38924 pv g7g5 f4g5 f6e6 b5b6 e6f5 c6e7 f5g5 e7c8 g5f4 c2d3 f4e3 a4a5 e3f4 a5a6 f4e3 a6a7 e3d3 a7a8q d3e3 b6b4 e3f2 b4b3 f2g1 b3b2 g1f1 a8h1
info depth 60 seldepth 27 multipv 9 score mate -13 nodes 3663742529 nps 94125540 hashfull 4 tbhits 0 time 38924 pv c8a6 c2d3 a6c8 a4a5 f6e6 b5b6 e6f6 a5a6 c8a6 c6d4 f6f7 b6a6 f7e7 f4g5 e7f7 d4f3 f7g8 f3e5 g8h8 a6a8 h8h7 d3d4 g7g6 g5f6 h7h6 a8h8
info depth 60 seldepth 27 multipv 10 score mate -13 nodes 3663742529 nps 94125540 hashfull 4 tbhits 0 time 38924 pv c8e6 c2d3 e6f5 b5b6 f5d7 a4a5 d7c8 a5a6 c8a6 c6d4 f6f7 b6a6 f7e7 f4g5 e7f7 d4f3 f7g8 f3e5 g8h8 a6a8 h8h7 d3d4 g7g6 g5f6 h7h6 a8h8
info depth 60 seldepth 27 multipv 11 score mate -13 nodes 3663742529 nps 94125540 hashfull 4 tbhits 0 time 38924 pv f6f7 c2d3 f7f6 a4a5 f6e6 b5b6 e6f6 a5a6 c8a6 c6d4 f6f7 b6a6 f7e7 f4g5 e7f7 d4f3 f7g8 f3e5 g8h8 a6a8 h8h7 d3d4 g7g6 g5f6 h7h6 a8h8
info depth 60 seldepth 27 multipv 12 score mate -13 nodes 3663742529 nps 94125540 hashfull 4 tbhits 0 time 38924 pv f6e6 c2d3 g7g5 f4g3 e6f6 a4a5 f6g7 b5b6 g7f6 a5a6 c8a6 c6e5 f6e7 b6a6 e7e8 a6a7 e8f8 a7c7 f8e8 e5g4 e8d8 g4f6 g5g4 c7b7 d8c8 b7b8
info depth 60 seldepth 23 multipv 13 score mate -11 nodes 3663742529 nps 94125540 hashfull 4 tbhits 0 time 38924 pv c8b7 b5b7 g7g5 f4g5 f6g5 c2d3 g5f4 b7e7 f4g3 a4a5 g3h3 e7g7 h3h4 a5a6 h4h5 a6a7 h5h6 g7g1 h6h5 a7a8q h5h4 a8h8
info depth 60 seldepth 23 multipv 14 score mate -11 nodes 3663742529 nps 94125540 hashfull 4 tbhits 0 time 38924 pv f6g6 c6e7 g6f7 e7c8 d3d2 f4d2 g7g5 b5g5 f7e6 a4a5 e6d7 a5a6 d7c6 a6a7 c6b7 g5g7 b7a6 a7a8q a6b5 a8d5 b5a4 g7a7

[Zenmastur]

Sorry, I didn't get much work done on your lines today. I guess I should post something so here is the first un resolved issue I have with your first solution, the 38. ... Kg6 line:

Code: Select all

[Event "?"]
[Site "?"]
[Date "2020.03.05"]
[Round "?"]
[White "FastGM solution 2"]
[Black "?"]
[Result "*"]
[EventDate "2020.03.05"]
[FEN "2b3k1/r2r2p1/p1N1q3/1B6/3p4/2b1B2R/PPP5/2K4R w - - 0 36"]

36.Rh8+ Kf7
37.Rf1+ Qf5 
38.Rxf5+ Kg6 
39.Rg5+ Kf6 
40.Bf4 axb5 
( [Stockfish 250220 64 POPCNT] 97:M23 40...Bxb2+ 41.Kxb2 Rab7 42.Rf8+ Rf7 43.Rxf7+ Rxf7 44.Bd3 Rb7+ 45.Kc1 Rb5 46.Bxb5 axb5 47.Rxb5 d3 48.Bg5+ Kf7 49.Rb6 Kg6 50.Ne7+ Kxg5 51.Nxc8 Kf5 52.Ne7+ Ke4 53.Rg6 Kf3 54.cxd3 Ke3 55.a4 Kxd3 56.a5 Kc4 57.a6 Kc5 58.a7 Kc4 59.Kc2 Kb4 60.a8=Q Kc5 61.Qd5+ Kb4 62.Rg4+ Ka3 63.Qb3# )

... snip ... snip...

Working from the bottom up,when I got to move 40. I found the move 40. ... Bxb2+. I let it run for several hours with no luck.
Regards,

Zenmastur

Up to move 47. Stockfish finds the moves that lead to the fastest checkmate:

36.Rh8+ Kf7 37.Rf1+ Qf5 38.Rxf5+ Kg6 39.Rg5+ Kf6 40.Bf4 Bxb2+ 41.Kxb2 Rab7 42.Rf8+ Rf7 43.Rxf7+ Rxf7 44.Bd3 Rb7+ 45.Kc1 Rb5 46.Bxb5 axb5 47.Rxb5 d3 but now not 48.Bg5+ but

[d]2b5/6p1/2N2k2/1R6/5B2/3p4/P1P5/2K5 w - - 0 48
48.a4 Bh3 49.a5 Bf1 50.Rb6 d2+ 51.Kxd2 g5 52.a6 Bxa6 53.Nd4+ Ke7 54.Bxg5+ Kd7 55.Rxa6 Kc7 56.Ra7+ Kb6 57.Rg7 Kc5 58.Kd3 Kd5 59.Rg6 Ke5 60.Kc4 Ke4 61.Re6+

After 48.a4 mate in 13 moves:

[d]2b5/6p1/2N2k2/1R6/P4B2/3p4/2P5/2K5 b - a3 0 48

Code: Select all

-M13	48. ... Bg4 49.a5 Be2 50.Rb6 d2+ 51.Kxd2 Bf1 52.a6 Bxa6 53.Rxa6 g5 54.Nd4+ Ke7 55.Bxg5+ Kd7 56.Ra7+ Kc8 57.Rg7 Kb8 58.Bf4+ Ka8 59.Rc7 Kb8 60.Nc6+ Ka8 61.Ra7+
-M13	48. ... Ke6 49.a5 Ba6 50.Rb6 g5 51.Bxg5 Bc4 52.cxd3 Bxd3 53.Nb4+ Kf5 54.Nxd3 Ke4 55.a6 Kxd3 56.a7 Ke4 57.a8Q+ Kf5 58.Rb5+ Kg4 59.Qg2+ Kh5 60.Bd2+ Kh4 61.Be1+
-M13	48. ... d2+ 49.Kxd2 Kf7 50.a5 Ke6 51.Rb6 g5 52.Na7+ Kf5 53.Nxc8 gxf4 54.a6 f3 55.Ke1 f2+ 56.Kxf2 Ke5 57.a7 Kd5 58.a8Q+ Ke5 59.Qa5+ Kd4 60.Rb5 Ke4 61.Qa4+
-M13	48. ... Be6 49.cxd3 Bg4 50.a5 Bc8 51.Rb6 g5 52.Nd4+ Kg7 53.a6 Bxa6 54.Be5+ Kf8 55.Rxa6 Kf7 56.Rb6 Kg8 57.Rb7 g4 58.Ne6 g3 59.Rg7+ Kh8 60.Rg6+ Kh7 61.Nf8+
-M13	48. ... Ba6 49.Rb6 Bc4 50.cxd3 Kf5 51.dxc4 Kxf4 52.a5 g5 53.a6 g4 54.a7 g3 55.a8Q g2 56.Qg8 g1Q+ 57.Qxg1 Kf5 58.Rb7 Kf6 59.Qg7+ Kf5 60.Rf7+ Ke6 61.Rf6+
-M13	48. ... Kf7 49.cxd3 Ke6 50.a5 g5 51.Bxg5 Kf7 52.Ne7 Ba6 53.Rb6 Bxd3 54.Rd6 Be4 55.Nc6 Bxc6 56.Rxc6 Kg7 57.a6 Kh7 58.a7 Kg7 59.a8Q Kf7 60.Qb7+ Ke8 61.Rc8+
-M13	48. ... Bh3 49.a5 Bc8 50.Bg5+ Kf7 51.cxd3 Ba6 52.Rb6 Kg6 53.Rxa6 Kxg5 54.Rb6 Kf6 55.a6 Ke6 56.a7 Kf5 57.a8Q Kf4 58.Nd4 Kg5 59.Qg2+ Kh5 60.Rg6 Kh4 61.Qg4+
-M13	48. ... Bd7 49.a5 Bc8 50.Bg5+ Kf7 51.cxd3 Ba6 52.Rb6 Kg6 53.Rxa6 Kxg5 54.Rb6 Kf6 55.a6 Ke6 56.a7 Kf5 57.a8Q Kf4 58.Nd4 Kg5 59.Qg2+ Kh5 60.Rg6 Kh4 61.Qg4+
-M13	48. ... g6 49.Bg5+ Ke6 50.a5 Bd7 51.Rb6 d2+ 52.Kxd2 Kf5 53.a6 Kg4 54.a7 Kxg5 55.Ne5 Bc6 56.Rxc6 Kf4 57.a8Q Kxe5 58.Qa4 Kf5 59.Qd4 Kg5 60.Rc5+ Kh6 61.Qh8+
-M13	48. ... g5 49.Bxg5+ Ke6 50.a5 Kf7 51.Rb6 d2+ 52.Kxd2 Kg6 53.Ne7+ Kxg5 54.Nxc8 Kg4 55.Rg6+ Kf4 56.Ne7 Ke5 57.a6 Ke4 58.a7 Kf4 59.a8Q Ke5 60.Qd5+ Kf4 61.Qf5+

Andreas

Ok, I'll concede its a mate in 27. Not sure why I couldn't find the move as I did an analysis of each ply in the line I posted. But SF failed to find it for some reason.

Regards,

Zenmastur

[Ovyron]

Is that conclusive or could there be some mate in 26 still hanging around?

[Zenmastur]

Is that conclusive or could there be some mate in 26 still hanging around?

There could be a mate in 26 I suppose. It's not impossible, just unlikely.

[Ovyron]

That's a reason I hate such things, there's just no way to know when you're done...