Stockfish endgame play: SIMPLY STUNNING

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

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BBauer
Posts: 658
Joined: Wed Mar 08, 2006 8:58 pm

Re: Stockfish endgame play: SIMPLY STUNNING

Post by BBauer »

After your posting I run PET too.
10 sec 1proc 34 soved
10 sec 2proc 36 solved
Computer: AMD X2 5200+ (2.67GHz)
Ubuntu 64-bit OS
128 mb hash

So I cannot reproduce your result.
Kind regards
Bernhard
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bob
Posts: 20943
Joined: Mon Feb 27, 2006 7:30 pm
Location: Birmingham, AL

Re: Stockfish endgame play: SIMPLY STUNNING

Post by bob »

Jouni wrote:I don't believe You need 10 000 games to verify difference. If You can't see it with less games, it's not significant at all. I played same 5 engines
in 2 round tournament with 3 totally different books. Very little difference
in points after 80 games, see here!

Code: Select all


book1
             
1   Rybka 3 1-cpu 32-bit  11.5 - 8.516.0 - 4.017.0 - 3.017.0 - 3.0**      61.5/80
2   Naum 4                8.5 - 11.513.5 - 6.513.5 - 6.515.0 - 5.0 **     50.5/80
3   bright-0.4a           4.0 - 16.06.5 - 13.511.5 - 8.510.5 - 9.5  **    32.5/80
4   Stockfish 1.3 JA      3.0 - 17.06.5 - 13.58.5 - 11.510.0 - 10.0   **   28.0/80
5   Fritz 10              3.0 - 17.05.0 - 15.09.5 - 10.510.0 - 10.0    **  27.5/80

book2

               
1   Rybka 3 1-cpu 32-bit  12.0 - 8.018.0 - 2.016.0 - 4.017.0 - 3.0**      63.0/80
2   Naum 4                8.0 - 12.013.0 - 7.016.0 - 4.013.0 - 7.0 **     50.0/80
3   Fritz 10              2.0 - 18.07.0 - 13.011.5 - 8.59.5 - 10.5  **    30.0/80
4   bright-0.4a           4.0 - 16.04.0 - 16.08.5 - 11.512.5 - 7.5   **   29.0/80
5   Stockfish 1.3 JA      3.0 - 17.07.0 - 13.010.5 - 9.57.5 - 12.5    **  28.0/80


book3
                
1   Rybka 3 1-cpu 32-bit  14.0 - 6.016.0 - 4.016.5 - 3.515.5 - 4.5**      62.0/80
2   Naum 4                6.0 - 14.013.0 - 7.015.5 - 4.514.0 - 6.0 **     48.5/80
3   Stockfish 1.3 JA      4.0 - 16.07.0 - 13.011.0 - 9.010.5 - 9.5  **    32.5/80
4   bright-0.4a           3.5 - 16.54.5 - 15.59.0 - 11.012.5 - 7.5   **   29.5/80
5   Fritz 10              4.5 - 15.56.0 - 14.09.5 - 10.57.5 - 12.5    **  27.5/80


Jouni
Fritz might disagree. And playing Rybka in the mix biases the results since it is singificantly better than the rest. But regardless of what you believe, 80 games is _not_ enough to measure anything significant unless one engine is significantly stronger than the others. And you can't know that from just 80 games, because the error bar is huge.
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Jouni
Posts: 3792
Joined: Wed Mar 08, 2006 8:15 pm
Full name: Jouni Uski

Re: Stockfish endgame play: SIMPLY STUNNING

Post by Jouni »

One addition: also in testsuites it's good, in one even better than Rybka3!
It's search(?) is so good, that some positions are solved without knowledge/tablebases.

Example 1:

Bg3, Endtest

[d]8/k7/8/2R5/8/4q3/8/4B2K w - -

Analysis by Stockfish 1.3 JA:

1.Kg2 Qxe1 2.Kf3 Kb6 3.Rf5 Kc6 4.Kf4 Kd6 5.Kg4 Ke6 6.Rf4 Qd1+ 7.Kg5 Qg1+ 8.Kh4 Ke5 9.Rf8 Qg6 10.Rf2 Qe4+ 11.Kh5 Qh1+ 12.Kg4 Qd1+ 13.Kg3 Ke4 14.Kh3
-+ (-7.03) Depth: 22 00:00:36 41543kN
1.Kg2 Qxe1 2.Kf3 Kb6 3.Rf5 Kc6 4.Kf4 Kd6 5.Kg4 Ke6 6.Rf4 Qd1+ 7.Kg5 Qg1+ 8.Kh4 Ke5 9.Rf8 Qg6 10.Rf2 Qe4+ 11.Kh5 Qh1+ 12.Kg4 Qd1+ 13.Kg3 Ke4 14.Kh3 Qe1
-+ (-7.03) Depth: 23 00:00:48 56684kN
1.Kg2 Qxe1 2.Kf3 Kb6 3.Rf5 Kc6 4.Kf4 Kd6 5.Kg4 Ke6 6.Rf4 Qd1+ 7.Kg5 Qg1+ 8.Kh4 Ke5 9.Rf8 Qg6 10.Rf2 Qe4+ 11.Kg3 Qe3+ 12.Rf3 Qe1+ 13.Kg4 Qd1 14.Kg3 Qe2 15.Rf7
-+ (-7.03) Depth: 24 00:01:04 77087kN
1.Kg2 Qxe1 2.Kf3 Kb6 3.Rf5 Kc6 4.Kf4 Kd6 5.Kg4 Ke6 6.Rf4 Qd1+ 7.Kg5 Qg1+ 8.Kh4 Ke5 9.Rf8 Qe1+ 10.Kh5 Qg3 11.Re8+ Kf5 12.Rf8+ Ke6 13.Rc8 Kf6 14.Rc6+ Kg7 15.Rc4 Qf3+ 16.Kh4 Kf6
-+ (-7.08) Depth: 25 00:01:34 114mN
1.Kg2 Qxe1 2.Kf3 Kb6 3.Rf5 Kc6 4.Kf4 Kd6 5.Kg4 Ke6 6.Rf4 Qd1+ 7.Kg5 Qg1+ 8.Kh4 Ke5 9.Rf8 Qe1+ 10.Kh5 Qg3 11.Re8+ Kf5 12.Rf8+ Ke6 13.Rc8 Kf6 14.Rc6+ Kg7 15.Rc4 Qf3+ 16.Rg4+ Kf6
-+ (-7.08) Depth: 26 00:02:04 153mN
1.Kg2 Qxe1 2.Kf3 Kb6 3.Rf5 Kc6 4.Kf4 Kd6 5.Kg4 Ke6 6.Rf4 Qd1+ 7.Kg5 Qg1+ 8.Kh4 Ke5 9.Rf8 Qe1+ 10.Kh5 Qg3 11.Rb8 Kf5 12.Rb5+ Ke6 13.Rb6+ Kd5 14.Rf6 Ke5 15.Rg6 Qh3+ 16.Kg5 Qf5+
-+ (-7.08) Depth: 27 00:02:41 199mN
1.Kg2 Qxe1 2.Kf3 Kb6 3.Rf5 Kc6 4.Kf4 Kd6 5.Kg4 Ke6 6.Rf4 Qd1+ 7.Kg5 Qg1+ 8.Kh4 Ke5 9.Rf8 Qd4+ 10.Kg3 Qd6 11.Rf3 Ke4+ 12.Kg2 Qd1 13.Rf7 Qd2+ 14.Rf2 Qg5+ 15.Kf1 Ke3 16.Re2+ Kd3
-+ (-7.13) Depth: 28 00:03:59 293mN
1.Kg2 Qxe1 2.Kf3 Kb6 3.Rf5 Kc6 4.Kf4 Kd6 5.Kg4 Ke6 6.Rf4 Qd1+ 7.Kg5 Qg1+ 8.Kh4 Ke5 9.Rf8 Qd4+ 10.Kg3 Qd6 11.Rf3 Ke4+ 12.Kg2 Qd1 13.Rf7 Qd2+ 14.Rf2 Qg5+ 15.Kf1 Ke3 16.Re2+ Kd3
-+ (-7.13) Depth: 29 00:05:12 379mN
1.Kg2 Qxe1 2.Kf3 Kb6 3.Rf5 Kc6 4.Kf4 Kd6 5.Kg4 Ke6 6.Rf4 Qd1+ 7.Kg5 Qg1+ 8.Kh4 Ke5 9.Rf8 Qd4+ 10.Kg3 Qd6 11.Rf3 Ke4+ 12.Kg2 Qd1 13.Rf7 Qh5 14.Re7+ Kf4 15.Rc7 Qe2+ 16.Kg1 Qe5
-+ (-7.18) Depth: 30 00:07:35 537mN
1.Bg3
-+ (-6.93) Depth: 30 00:08:38 597mN
1.Bg3
-+ (-6.15) Depth: 31 00:10:00 662mN
1.Bg3
-+ (-3.01) Depth: 32 00:12:08 776mN

Example 2:
bxc8N+, Endtest

[d]2n5/kP6/8/K7/4B3/8/8/8 w - -

Analysis by Stockfish 1.3 JA:

1.bxc8B Kb8 2.Bg4 Kc7 3.Kb4 Kd6 4.Bgf5 Ke5 5.Kc5 Kf6 6.Kd4 Kf7 7.Ke5 Ke7 8.Bf3 Ke8 9.Ke6 Kd8 10.Kd6 Ke8 11.Bg6+ Kd8 12.Bb1 Ke8 13.Bh5+ Kd8 14.Be4 Kc8 15.Bc6
+- (82.61) Depth: 26 00:00:38 38326kN
1.bxc8B Kb8 2.Bg4 Kc7 3.Kb4 Kd6 4.Bgf5 Ke5 5.Kc5 Kf6 6.Kd4 Kf7 7.Ke5 Ke7 8.Bf3 Ke8 9.Ke6 Kd8 10.Kd6 Ke8 11.Bg6+ Kd8 12.Bb1 Ke8 13.Bh5+ Kd8 14.Bg4 Ke8 15.Be6 Kf8
+- (82.61) Depth: 27 00:00:52 55105kN
1.bxc8B Kb8 2.Bg4 Kc7 3.Kb4 Kd6 4.Bgf5 Ke5 5.Kc5 Kf6 6.Kd4 Kf7 7.Ke5 Ke7 8.Bf3 Ke8 9.Ke6 Kd8 10.Kd6 Ke8 11.Bg6+ Kd8 12.Bb1 Ke8 13.Bh5+ Kd8 14.Bg4 Ke8 15.Be6 Kf8 16.Be4
+- (82.61) Depth: 28 00:01:11 77471kN
1.bxc8B Kb8 2.Bg4 Kc7 3.Kb4 Kd6 4.Bgf5 Ke5 5.Kc5 Kf6 6.Kd4 Kf7 7.Ke5 Ke7 8.Bf3 Ke8 9.Ke6 Kd8 10.Kd6 Ke8 11.Bg6+ Kd8 12.Bb1 Ke8 13.Bh5+ Kd8 14.Be4 Kc8 15.Bd5 Kd8 16.Bdf7 Kc8
+- (82.61) Depth: 29 00:01:28 97874kN
1.bxc8B Kb8 2.Bg4 Kc7 3.Kb4 Kd6 4.Bgf5 Ke5 5.Kc5 Kf6 6.Kd4 Kf7 7.Ke5 Ke7 8.Bf3 Ke8 9.Ke6 Kd8 10.Kd6 Ke8 11.Bg6+ Kd8 12.Bb1 Ke8 13.Bh5+ Kd8 14.Be4 Kc8 15.Bd5 Kd8 16.Bdf7 Kc8
+- (82.61) Depth: 30 00:01:57 131mN
1.bxc8B Kb8 2.Bg4 Kc7 3.Kb4 Kd6 4.Bgf5 Ke5 5.Kc5 Kf6 6.Kd4 Kf7 7.Ke5 Ke7 8.Bf3 Ke8 9.Ke6 Kd8 10.Kd6 Ke8 11.Bg6+ Kd8 12.Bb1 Ke8 13.Bd5 Kd8 14.Bg6 Kc8 15.Bgf7 Kd8 16.Bb3 Kc8
+- (82.61) Depth: 31 00:02:23 162mN
1.bxc8B Kb8 2.Bg4 Kc7 3.Kb4 Kd6 4.Bgf5 Ke5 5.Kc5 Kf6 6.Kd4 Kf7 7.Ke5 Ke7 8.Bf3 Ke8 9.Ke6 Kd8 10.Kd6 Ke8 11.Bg6+ Kd8 12.Bb1 Ke8 13.Bd5 Kd8 14.Bba2 Ke8 15.Be6 Kd8 16.Bg4 Ke8
+- (82.61) Depth: 32 00:03:11 215mN
1.bxc8N+
+- (#54) Depth: 32 00:03:43 244mN

Jouni
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bob
Posts: 20943
Joined: Mon Feb 27, 2006 7:30 pm
Location: Birmingham, AL

Re: Stockfish endgame play: SIMPLY STUNNING

Post by bob »

Jouni wrote:One addition: also in testsuites it's good, in one even better than Rybka3!
It's search(?) is so good, that some positions are solved without knowledge/tablebases.

Example 1:

Bg3, Endtest

[d]8/k7/8/2R5/8/4q3/8/4B2K w - -

Analysis by Stockfish 1.3 JA:

1.Kg2 Qxe1 2.Kf3 Kb6 3.Rf5 Kc6 4.Kf4 Kd6 5.Kg4 Ke6 6.Rf4 Qd1+ 7.Kg5 Qg1+ 8.Kh4 Ke5 9.Rf8 Qg6 10.Rf2 Qe4+ 11.Kh5 Qh1+ 12.Kg4 Qd1+ 13.Kg3 Ke4 14.Kh3
-+ (-7.03) Depth: 22 00:00:36 41543kN
1.Kg2 Qxe1 2.Kf3 Kb6 3.Rf5 Kc6 4.Kf4 Kd6 5.Kg4 Ke6 6.Rf4 Qd1+ 7.Kg5 Qg1+ 8.Kh4 Ke5 9.Rf8 Qg6 10.Rf2 Qe4+ 11.Kh5 Qh1+ 12.Kg4 Qd1+ 13.Kg3 Ke4 14.Kh3 Qe1
-+ (-7.03) Depth: 23 00:00:48 56684kN
1.Kg2 Qxe1 2.Kf3 Kb6 3.Rf5 Kc6 4.Kf4 Kd6 5.Kg4 Ke6 6.Rf4 Qd1+ 7.Kg5 Qg1+ 8.Kh4 Ke5 9.Rf8 Qg6 10.Rf2 Qe4+ 11.Kg3 Qe3+ 12.Rf3 Qe1+ 13.Kg4 Qd1 14.Kg3 Qe2 15.Rf7
-+ (-7.03) Depth: 24 00:01:04 77087kN
1.Kg2 Qxe1 2.Kf3 Kb6 3.Rf5 Kc6 4.Kf4 Kd6 5.Kg4 Ke6 6.Rf4 Qd1+ 7.Kg5 Qg1+ 8.Kh4 Ke5 9.Rf8 Qe1+ 10.Kh5 Qg3 11.Re8+ Kf5 12.Rf8+ Ke6 13.Rc8 Kf6 14.Rc6+ Kg7 15.Rc4 Qf3+ 16.Kh4 Kf6
-+ (-7.08) Depth: 25 00:01:34 114mN
1.Kg2 Qxe1 2.Kf3 Kb6 3.Rf5 Kc6 4.Kf4 Kd6 5.Kg4 Ke6 6.Rf4 Qd1+ 7.Kg5 Qg1+ 8.Kh4 Ke5 9.Rf8 Qe1+ 10.Kh5 Qg3 11.Re8+ Kf5 12.Rf8+ Ke6 13.Rc8 Kf6 14.Rc6+ Kg7 15.Rc4 Qf3+ 16.Rg4+ Kf6
-+ (-7.08) Depth: 26 00:02:04 153mN
1.Kg2 Qxe1 2.Kf3 Kb6 3.Rf5 Kc6 4.Kf4 Kd6 5.Kg4 Ke6 6.Rf4 Qd1+ 7.Kg5 Qg1+ 8.Kh4 Ke5 9.Rf8 Qe1+ 10.Kh5 Qg3 11.Rb8 Kf5 12.Rb5+ Ke6 13.Rb6+ Kd5 14.Rf6 Ke5 15.Rg6 Qh3+ 16.Kg5 Qf5+
-+ (-7.08) Depth: 27 00:02:41 199mN
1.Kg2 Qxe1 2.Kf3 Kb6 3.Rf5 Kc6 4.Kf4 Kd6 5.Kg4 Ke6 6.Rf4 Qd1+ 7.Kg5 Qg1+ 8.Kh4 Ke5 9.Rf8 Qd4+ 10.Kg3 Qd6 11.Rf3 Ke4+ 12.Kg2 Qd1 13.Rf7 Qd2+ 14.Rf2 Qg5+ 15.Kf1 Ke3 16.Re2+ Kd3
-+ (-7.13) Depth: 28 00:03:59 293mN
1.Kg2 Qxe1 2.Kf3 Kb6 3.Rf5 Kc6 4.Kf4 Kd6 5.Kg4 Ke6 6.Rf4 Qd1+ 7.Kg5 Qg1+ 8.Kh4 Ke5 9.Rf8 Qd4+ 10.Kg3 Qd6 11.Rf3 Ke4+ 12.Kg2 Qd1 13.Rf7 Qd2+ 14.Rf2 Qg5+ 15.Kf1 Ke3 16.Re2+ Kd3
-+ (-7.13) Depth: 29 00:05:12 379mN
1.Kg2 Qxe1 2.Kf3 Kb6 3.Rf5 Kc6 4.Kf4 Kd6 5.Kg4 Ke6 6.Rf4 Qd1+ 7.Kg5 Qg1+ 8.Kh4 Ke5 9.Rf8 Qd4+ 10.Kg3 Qd6 11.Rf3 Ke4+ 12.Kg2 Qd1 13.Rf7 Qh5 14.Re7+ Kf4 15.Rc7 Qe2+ 16.Kg1 Qe5
-+ (-7.18) Depth: 30 00:07:35 537mN
1.Bg3
-+ (-6.93) Depth: 30 00:08:38 597mN
1.Bg3
-+ (-6.15) Depth: 31 00:10:00 662mN
1.Bg3
-+ (-3.01) Depth: 32 00:12:08 776mN

Example 2:
bxc8N+, Endtest

[d]2n5/kP6/8/K7/4B3/8/8/8 w - -

Analysis by Stockfish 1.3 JA:

1.bxc8B Kb8 2.Bg4 Kc7 3.Kb4 Kd6 4.Bgf5 Ke5 5.Kc5 Kf6 6.Kd4 Kf7 7.Ke5 Ke7 8.Bf3 Ke8 9.Ke6 Kd8 10.Kd6 Ke8 11.Bg6+ Kd8 12.Bb1 Ke8 13.Bh5+ Kd8 14.Be4 Kc8 15.Bc6
+- (82.61) Depth: 26 00:00:38 38326kN
1.bxc8B Kb8 2.Bg4 Kc7 3.Kb4 Kd6 4.Bgf5 Ke5 5.Kc5 Kf6 6.Kd4 Kf7 7.Ke5 Ke7 8.Bf3 Ke8 9.Ke6 Kd8 10.Kd6 Ke8 11.Bg6+ Kd8 12.Bb1 Ke8 13.Bh5+ Kd8 14.Bg4 Ke8 15.Be6 Kf8
+- (82.61) Depth: 27 00:00:52 55105kN
1.bxc8B Kb8 2.Bg4 Kc7 3.Kb4 Kd6 4.Bgf5 Ke5 5.Kc5 Kf6 6.Kd4 Kf7 7.Ke5 Ke7 8.Bf3 Ke8 9.Ke6 Kd8 10.Kd6 Ke8 11.Bg6+ Kd8 12.Bb1 Ke8 13.Bh5+ Kd8 14.Bg4 Ke8 15.Be6 Kf8 16.Be4
+- (82.61) Depth: 28 00:01:11 77471kN
1.bxc8B Kb8 2.Bg4 Kc7 3.Kb4 Kd6 4.Bgf5 Ke5 5.Kc5 Kf6 6.Kd4 Kf7 7.Ke5 Ke7 8.Bf3 Ke8 9.Ke6 Kd8 10.Kd6 Ke8 11.Bg6+ Kd8 12.Bb1 Ke8 13.Bh5+ Kd8 14.Be4 Kc8 15.Bd5 Kd8 16.Bdf7 Kc8
+- (82.61) Depth: 29 00:01:28 97874kN
1.bxc8B Kb8 2.Bg4 Kc7 3.Kb4 Kd6 4.Bgf5 Ke5 5.Kc5 Kf6 6.Kd4 Kf7 7.Ke5 Ke7 8.Bf3 Ke8 9.Ke6 Kd8 10.Kd6 Ke8 11.Bg6+ Kd8 12.Bb1 Ke8 13.Bh5+ Kd8 14.Be4 Kc8 15.Bd5 Kd8 16.Bdf7 Kc8
+- (82.61) Depth: 30 00:01:57 131mN
1.bxc8B Kb8 2.Bg4 Kc7 3.Kb4 Kd6 4.Bgf5 Ke5 5.Kc5 Kf6 6.Kd4 Kf7 7.Ke5 Ke7 8.Bf3 Ke8 9.Ke6 Kd8 10.Kd6 Ke8 11.Bg6+ Kd8 12.Bb1 Ke8 13.Bd5 Kd8 14.Bg6 Kc8 15.Bgf7 Kd8 16.Bb3 Kc8
+- (82.61) Depth: 31 00:02:23 162mN
1.bxc8B Kb8 2.Bg4 Kc7 3.Kb4 Kd6 4.Bgf5 Ke5 5.Kc5 Kf6 6.Kd4 Kf7 7.Ke5 Ke7 8.Bf3 Ke8 9.Ke6 Kd8 10.Kd6 Ke8 11.Bg6+ Kd8 12.Bb1 Ke8 13.Bd5 Kd8 14.Bba2 Ke8 15.Be6 Kd8 16.Bg4 Ke8
+- (82.61) Depth: 32 00:03:11 215mN
1.bxc8N+
+- (#54) Depth: 32 00:03:43 244mN

Jouni
Maybe not quite _that_ good. A mate in 54 is a draw and the search should be able to recognize that. No KBN vs K takes 50+ moves to solve.

To solve 1, you simply need excessive check extensions so that you recognize that the rook checks forever, only avoiding squares where the queen can take it to get out of check and get out of the stalemate position as well.

The second only needs to know that two bishops of same color don't win, while BN vs K is a guaranteed win if neither piece can be taken on move.

I'm not convinced that solving either of those is going to win real games...
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zamar
Posts: 613
Joined: Sun Jan 18, 2009 7:03 am

Re: Stockfish endgame play: SIMPLY STUNNING

Post by zamar »

bob wrote:
Jouni wrote: 1.bxc8N+
+- (#54) Depth: 32 00:03:43 244mN

Jouni
Maybe not quite _that_ good. A mate in 54 is a draw and the search should be able to recognize that. No KBN vs K takes 50+ moves to solve.
This is a very interesting situation!! Here we are facing aspiration window fail high. This means that because there is "no best reply" for our opponent, there is no PV. And since there is no PV we can't check for fifty move tule. However I guess that if you let the program run one ply deeper it will either announce mate in less than fifty moves or (if it can't find any) return to original bxc8B.
Joona Kiiski
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MikeGL
Posts: 1010
Joined: Thu Sep 01, 2011 2:49 pm

Re: Stockfish endgame play: SIMPLY STUNNING

Post by MikeGL »

So how does current engines fare on this PET endgame test.
Looks difficult 11 years ago.
I told my wife that a husband is like a fine wine; he gets better with age. The next day, she locked me in the cellar.
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Jouni
Posts: 3792
Joined: Wed Mar 08, 2006 8:15 pm
Full name: Jouni Uski

Re: Stockfish endgame play: SIMPLY STUNNING

Post by Jouni »

All 10+ years old testpositions are useless today. But here You see incredible SF progress clearly (no tablebases used):

Analysis by Stockfish 110121:

1.bxc8N+ Kb8 2.Nd6 Kc7 3.Nf5 Kd7 4.Bd5 Ke8 5.Kb6 Kf8 6.Kc5 Ke8 7.Kd4 Kf8 8.Ke5 Ke8 9.Nh4 Kf8 10.Kf6 Ke8 11.Ng6 Kd7 12.Ke5 Kc7 13.Kd4 Kb6 14.Kc4 Kc7 15.Kc5 Kd7 16.Bc4 Ke8 17.Kd6 Kd8 18.Bb5 Kc8 19.Ne5 Kb7 20.Nd7 Kc8 21.Nc5 Kd8 22.Ne6+ Kc8 23.Ba6+ Kb8 24.Kc6 Ka7 25.Nc5 Kb8 26.Kb6 Ka8 27.Bb7+ Kb8 28.Na6#
+- (#28) Depth: 103/56 00:01:17 2063mN

100 plies vs 32 plies :) . Of course there is also hardware gains.
Jouni
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Jouni
Posts: 3792
Joined: Wed Mar 08, 2006 8:15 pm
Full name: Jouni Uski

Re: Stockfish endgame play: SIMPLY STUNNING

Post by Jouni »

Second position (no tablebases):

Analysis by Stockfish 110121:

1.Bg3 Kb6 2.Rc2 Qxg3 3.Rb2+ Kc6 4.Rc2+ Kd5 5.Rd2+ Ke4 6.Re2+ Kf4 7.Rf2+ Ke5 8.Re2+ Kf6 9.Rf2+ Ke6 10.Re2+ Kf7 11.Rf2+ Ke8 12.Re2+ Kf8 13.Rf2+ Ke7
= (0.00) Depth: 27/53 00:00:01 33115kN
1.Bg3 Kb6 2.Rc2 Qxg3 3.Rb2+ Kc6 4.Rc2+
= (0.00) Depth: 28/24 00:00:01 34891kN
1.Bg3 Kb6 2.Rc2 Qxg3 3.Rb2+ Kc6 4.Rc2+
= (0.00) Depth: 29/28 00:00:01 34905kN

We have progress here :wink: .
Jouni
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