I was running a tournament between Stockfish and another engine and something curious happened. Stockfish was to move and it was computing. It saw a move (displayed as the PV) but made a different move instead. Sure, it sounds like it changed its mind, but look at the output sent to the .pgn file for this move:
44. gxf6
{(44.Qg8 Qa2 45.gxf6 Ra6 46.Rxf7+ Bxf7 47.Qxf7+ Kd8 48.Qg8+ Re8 49.f7) +0.72/19 34}
The move Stockfish "saw" as best was: 44. Qg8 with an eval of 0.72.
However the move played was: 44. gxf6
I've seen this a few times (not a lot, but a few) and this time I managed to capture the pgn for the game so I have this "evidence".
Is this a bug (Arena? Stockfish? UCI?) or simply a case where the engine changed its mind without updating the PV?
Here is the position by the way:
[D] 4b3/3k1n1R/3rrpQ1/qp1p2P1/3B4/2P5/7P/5RK1 w - - 1 44
Roy
Arena 3.0 and Stockfish - bug?
Moderators: hgm, Rebel, chrisw
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Uri Blass
- Posts: 10314
- Joined: Thu Mar 09, 2006 12:37 am
- Location: Tel-Aviv Israel
Re: Arena 3.0 and Stockfish - bug?
Based on my knowledge stockfish can change its mind without changing the pv and unfortunately it is something that the programmers of stockfish are not interested to fix because it make the code more complex(they do not care about the fact that stockfish is less useful for analysis because of that reason because the user cannot be sure if the first move of the pv is what stockfish plans to play).
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zullil
- Posts: 6442
- Joined: Tue Jan 09, 2007 12:31 am
- Location: PA USA
- Full name: Louis Zulli
Re: Arena 3.0 and Stockfish - bug?
Here Stockfish-2.0.1 (8 threads) goes for Qg8 almost instantly, and never switches back. What time control and how many threads was your Stockfish using?
Code: Select all
Searching: 4b3/3k1n1R/3rrpQ1/qp1p2P1/3B4/2P5/7P/5RK1 w - -
infinite: 1 ponder: 0 time: 0 increment: 0 moves to go: 0
1 -0.24 00:00 3930 Rxf7+
2 -0.24 00:00 4018 Rxf7+ Bxf7 Qxf7+ Re7
3 -0.97 00:00 4562 Rxf7+ Bxf7 Qxf7+ Re7 Qg8 fxg5 Qxg5
3 -0.32 00:00 4995 gxf6 Kd8 Rxf7 Bxf7 Qxf7
4 -0.12 00:00 6478 gxf6 Kd8 Rxf7 Bxf7 Qxf7 Qc7 Qg8+ Re8
5 -0.08 00:00 7520 gxf6 Kd8 Rxf7 Bxf7 Qxf7 Qc7 Qg7
6 > +0.08 00:00 8959 gxf6 Kd8 Rxf7 Bxf7 Qxf7 Qc7 Qxc7+ Kxc7 f7
6 > +0.24 00:00 9590 gxf6 Kd8 Rxf7 Bxf7 Qxf7 Qc7 Qxc7+ Kxc7 f7
6 +0.36 00:00 11617 gxf6 Kd8 Rxf7 Bxf7 Qxf7 Re8 Bc5 Rde6
7 < -0.12 00:00 23890 gxf6 Kc6 Rxf7 Rd7
7 < -0.61 00:00 35109 gxf6 Kc6 Rxf7 Rd7
7 +0.65 00:00 43612 Qg8 Kc6 g6 Ng5 Ra7 Nh3+ Kh1 Qd8
8 +1.01 00:00 61144 Qg8 Kc6 g6 Ng5 Ra7 Qd8 Kh1 Re7 Bxf6 Rxa7 Bxd8
Rxd8 Rf6+ Kb7
9 < +0.48 00:00 91158 Qg8 Kc6 g6 Ng5 Ra7 Qd8 Kh1 Re7 Bxf6 Bxg6 Qxd8
Be4+ Kg1 Rxd8 Bxe7 Nh3#
9 +0.81 00:00 138886 Qg8 Kc6 g6 Ng5 h4 Ne4 Ra7 Qd8 Rfa1 Nc5 Qh7 Rd7
10 > +1.21 00:00 328817 Qg8 Kc6 g6 Ng5 h4 Ne4 Ra7 Qd8 Rfa1 Nc5 g7
10 +1.09 00:00 333430 Qg8 Kc6 g6 Ng5 h4 Ne4 Ra7 Qd8 Rfa1 Nc5 g7 f5 Qf8
Rg6+ Kf1
11 > +1.49 00:00 458004 Qg8 Kc6 g6 Ng5 h4 Ne4 Ra7 Qd8 Rfa1 Nc5 g7 f5 Qf8
Rg6+ Kf1
11 +1.54 00:00 494022 Qg8 Kc6 g6 Ng5 h4 Ne4 Ra7 f5 Qh7 Rxg6+ Kh2 Rd7
Qxg6+ Bxg6 Rxa5 Rd6 Be5
12 +1.45 00:01 1112K Qg8 f5 Rxf7+ Bxf7 Qxf7+ Kc6 Qxf5 Qd8 Ra1 Qc8 Qf1
Rg6 Qf4 Kc7 Ra7+ Kb8
13 +1.66 00:01 1465K Qg8 f5 Rxf7+ Bxf7 Qxf7+ Kc6 Qxf5 Qd8 Be5 Rg6 h4
Rde6 Ra1 Qe7 Kh2 Kb7 Kg3 Ra6 Rb1
14 < +1.41 00:01 2430K Qg8 f5 Rxf7+ Bxf7 Qxf7+ Kc6 Qxf5 Re8 h4 Rde6 h5
Qc7 h6 Qg3+ Kh1 Qh4+ Kg2 Re2+
14 < +1.17 00:01 3140K Qg8 f5 Rxf7+ Bxf7 Qxf7+ Kc6 Qxf5 Re8 h4 Rde6 h5
Qc7 h6 Qg3+ Kh1 Qh4+ Kg2 Re2+
14 +1.41 00:01 4340K Qg8 f5 Rxf7+ Bxf7 Qxf7+ Kc6 Qxf5 Re8 g6 Qc7 g7
Rh6 Qc2 Qd6 Ra1 Qg6+ Qg2 Qxg2+ Kxg2 Rhe6 Kf3 R6e7
Ra6+ Kd7 Rb6 Rg8 Rxb5
15 < +1.05 00:01 5640K Qg8 f5 Rxf7+ Bxf7 Qxf7+ Kc6 Qxf5 Re8 g6 Qc7 g7
Rh6 Qc2 Qd6 Ra1 Qg6+ Qg2 Qxg2+ Kxg2 Rhe6 Kf3 Re4
Ra5 Rg8
15 +1.01 00:02 8001K Qg8 f5 Rxf7+ Bxf7 Qxf7+ Kc6 Qxf5 Re8 g6 Qc7 g7
Rh6 Qc2 Qd6 Ra1 Qg6+ Qxg6+ Rxg6+ Kf2 Rg4 Kf3 Rge4
Ra6+ Kd7 Rb6 Rg8 Rxb5 Ke6 h3 Kd6 Kg3 Ke6 h4 Re2
16 +1.01 00:02 9104K Qg8 f5 Rxf7+ Bxf7 Qxf7+ Kc6 Qxf5 Re8 g6 Qc7 g7
Rh6 Qc2 Qd6 Ra1 Qg6+ Qxg6+ Rxg6+ Kf2 Rg4 Kf3 Rge4
Ra6+ Kd7 Rb6 Rg8 Rxb5 Ke6 h3 Kd6 Kg3 Ke6 h4 Re2
17 > +1.21 00:02 9828K Qg8 f5 Rxf7+ Bxf7 Qxf7+ Kc6 Qxf5 Re8 g6 Qc7 g7
Rh6 Qc2 Qd6 Ra1 Qg6+ Qxg6+ Rxg6+ Kf2 Rg4 Kf3 Rge4
Ra6+ Kd7 Rb6 Rg8 Rxb5 Ke6 h3 Kd6 Kg3 Ke6 h4 Re2
h5
17 +1.05 00:02 10444K Qg8 f5 Rxf7+ Bxf7 Qxf7+ Kc6 Qxf5 Re8 g6 Qc7 g7
Rh6 Qc2 Qd6 Ra1 Qg6+ Qxg6+ Rxg6+ Kf2 Rg4 Kf3 Rge4
Ra6+ Kd7 Rb6 Rg8 Rxb5 Ke6 h3 Kd6 Kg3 Ke6 h4 Re2
h5
18 > +1.13 00:02 11016K Qg8 f5 Rxf7+ Bxf7 Qxf7+ Kc6 Qxf5 Re8 g6 Qc7 g7
Rh6 Qc2 Qd6 Ra1 Qg6+ Qxg6+ Rxg6+ Kf2 Rg4 Kf3 Rge4
Ra6+ Kd7 Rb6 Rg8 Rxb5 Ke6 h3 Kd6 Kg3 Ke6 h4 Re2
h5
18 < +0.97 00:03 13383K Qg8 Kc6 g6 Ng5 h4 Nf3+ Rxf3 Qa2 Bf2 Qb1+ Kh2 Qxg6
Rg7 Qe4 Kg2 f5 h5 Rd7
18 < +0.89 00:03 13995K Qg8 Kc6 g6 Ng5 h4 Nf3+ Rxf3 Qa2 Bf2 Qb1+ Kh2 Qxg6
Rg7 Qe4 Kg2 f5 h5 Rd7
18 > +1.21 00:03 15155K Qg8 Kc6 g6 Ng5 Ra7 Qd8 Rfa1 Nf3+ Kh1 Nxd4 cxd4 b4
g7 Re7 R1a6+ Kb5 Qh7 Rxa6 Qd3+
18 +1.05 00:04 20349K Qg8 f5 Rxf7+ Bxf7 Qxf7+ Kc6 Qxf5 Re8 g6 Qc7 g7
Rh6 Qc2 Qd6 Ra1 Qg6+ Qxg6+ Rxg6+ Kf2 Rg4 Kf3 Rge4
Ra6+ Kd7 Rb6 Rg8 Rxb5 Ke6 h3 Kd6 Kg3 Ke6 h4 Re2
h5
19 > +1.13 00:04 21681K Qg8 f5 Rxf7+ Bxf7 Qxf7+ Kc6 Qxf5 Re8 g6 Qc7 g7
Rh6 Qc2 Qd6 Ra1 Qg6+ Qxg6+ Rxg6+ Kf2 Rg4 Kf3 Rge4
Ra6+ Kd7 Rb6 Rg8 Rxb5 Ke6 h3 Kd6 Kg3 Ke6 h4 Re2
h5
19 > +1.21 00:04 22205K Qg8 f5 Rxf7+ Bxf7 Qxf7+ Kc6 Qxf5 Re8 g6 Qc7 g7
Rh6 Qc2 Qd6 Ra1 Qg6+ Qxg6+ Rxg6+ Kf2 Rg4 Kf3 Rge4
Ra6+ Kd7 Rb6 Rg8 Rxb5 Ke6 h3 Kd6 Kg3 Ke6 h4 Re2
h5
19 +1.21 00:04 23178K Qg8 f5 Rxf7+ Bxf7 Qxf7+ Kc6 Qxf5 Re8 g6 Qc7 g7
Rh6 Qc2 Qd6 Ra1 Qg6+ Qxg6+ Rxg6+ Kf2 Rg4 Kf3 Rge4
Ra6+ Kd7 Rb6 Rg8 Rxb5 Ke6 h3 Rh4 Kg3 Re4 h4 Re2
h5
20 > +1.37 00:05 27874K Qg8 f5 Rxf7+ Bxf7 Qxf7+ Kc6 Qxf5 Re8 g6 Qc7 Ra1
Qc8 Qh5 Re4 h3 b4 g7 bxc3 Bxc3
20 > +1.54 00:06 31121K Qg8 f5 Rxf7+ Bxf7 Qxf7+ Kc6 Qxf5 Qd8 Be5 Rg6 h4
Rde6 Ra1 Qe7 Bg3 Qc5+ Bf2 Qxc3 Ra6+ Kc7 Rxe6
20 < +1.05 00:07 44451K Qg8 Re4 g6 Rg4+ Kh1 Qa2 Rg1 Rxg1+ Bxg1 d4 gxf7
Qd5+ Qg2 Qxg2+ Kxg2 Bxf7 Rxf7+ Ke8
20 < +0.89 00:08 47699K Qg8 Re4 g6 Rg4+ Kh1 Qa2 Rg1 Rxg1+ Bxg1 d4 gxf7
Qd5+ Qg2 Qxg2+ Kxg2 Bxf7 Rxf7+ Ke8 Rb7 d3 Rb8+
Kd7 Rxb5 d2 Rb7+ Ke8
20 < +0.57 00:09 55135K Qg8 Re4 g6 Rg4+ Kh1 Qa2 Rg1 Rxg1+ Bxg1 d4 gxf7
Qd5+ Qg2 Qxg2+ Kxg2 Bxf7 Rxf7+ Ke8 Rb7 d3 h4 d2
Rb8+ Kd7
20 +0.89 00:18 120359K Qg8 Re4 gxf6 Kc6 Rxf7 Bxf7 Qxf7 Rg4+ Kh1 Qa2 Qe8+
Kc7 Rg1 Rxg1+ Kxg1 Qb1+ Kg2 Qc2+ Kg3 Qd3+ Kg4
Qd1+ Kh4 b4 Qe7+ Kc6 Ba7 d4 Bb8 dxc3 Qc7+ Kb5
Qxd6 c2 Qe5+ Kc4 Qf4+ Kb3 Qe3+ Ka2
21 > +1.29 00:20 139510K Qg8 Re4 gxf6 Kc6 Rxf7 Bxf7 Qxf7 Rg4+ Kh1 Qa2 Qe8+
Kc7 Rg1 Rxg1+ Kxg1 Qb1+ Kg2 Qc2+ Kg3 Qd3+ Kg4
Qd1+ Kh4 b4 Be5 Qe1+ Kg5 Qe3+ Kg6 Qe4+ Kg7 Qg4+
Kf8 bxc3 Qe7+
21 +1.25 00:21 146523K Qg8 Re4 gxf6 Kc6 Rxf7 Bxf7 Qxf7 Rg4+ Kh1 Qa2 Qe8+
Kc7 Rg1 Rxg1+ Kxg1 Qb1+ Kg2 Rc6 Qe5+ Kd7 Qxd5+
Rd6 Qb7+ Ke6 Qe7+ Kd5 Qe5+ Kc6 h4 Qg6+ Kh2 Qc2+
Kh3 Qd3+ Kg4 Qd1+ Kf4 Qd2+ Kf3 Qd3+ Kf2 Qc2+ Kg3
Qd3+ Kg4
22 +1.21 00:27 188764K Qg8 Re4 gxf6 Kc6 Rxf7 Bxf7 Qxf7 Rg4+ Kh1 Qa2 Qe8+
Kc7 Rg1 Rxg1+ Kxg1 Qb1+ Kg2 Rc6 Qe5+ Kd7 Qxd5+
Rd6 Qb7+ Ke6 Qe7+ Kd5 Qe5+ Kc6 Qe8+ Kd5 Qh5+ Ke6
Qe5+ Kd7 h4 Qc2+ Kg3 Qd3+ Kf4 Qd2+ Kf5 Qd3+ Kg5
b4 Qe7+ Kc6 Be5 Qd2+ Kg6 Qd3+ Kg7 Rd7
23 < +0.97 00:32 228074K Qg8 Re4 gxf6 Kc6 Rxf7 Bxf7 Qxf7 Rg4+ Kh1 Qa2 Qe8+
Kc7 Rg1 Rxg1+ Kxg1 Qb1+ Kg2 Rc6 Qe5+ Kd7 Qxd5+
Rd6 Qb7+ Ke6 Qe7+ Kd5 Qe5+ Kc6 Qe8+ Kb7 Kg3 Qd3+
Kh4 b4 Qe7+ Kc6 f7 Rh6+ Kg5 Rg6+ Kf4 Qf1+ Ke4
Qg2+
23 > +1.45 00:34 242706K Qg8 Re4 gxf6 Kc6 Rxf7 Bxf7 Qxf7 Rg4+ Kh1 Qa2 Qe8+
Kc7 Rg1 Rxg1+ Kxg1 Qb1+ Kg2 Rc6 Qe5+ Kd7 Qxd5+
Rd6 Qb7+ Ke6 Qe7+ Kd5 Qe5+ Kc6 Qe8+ Kb7 h4 b4
Qb5+ Kc8 Qc5+ Kd7 Qa7+ Kc8 Qe7 Qg6+ Kh2 Qc2+ Kg3
Qd3+ Kf4 Qd2+ Kf3 Qd3+ Kf2 Qf5+ Kg3
23 +1.41 00:35 250919K Qg8 Re4 gxf6 Kc6 Rxf7 Bxf7 Qxf7 Rg4+ Kh1 Qa2 Qe8+
Kc7 Rg1 Rxg1+ Kxg1 Qb1+ Kg2 Rc6 Qe5+ Kd7 Qxd5+
Rd6 Qb7+ Ke6 Qe7+ Kd5 Qe5+ Kc6 Qe8+ Kb7 h4 b4
Qb5+ Kc8 Qc5+ Kd7 Qa7+ Kc8 Qe7 Qg6+ Kh2 Qc2+ Kg3
Qd3+ Kf4 Qf1+ Ke5 Rd7
24 < +1.17 00:36 255097K Qg8 Re4 gxf6 Kc6 Rxf7 Bxf7 Qxf7 Rg4+ Kh1 Qa2 Qe8+
Kc7 Rg1 Rxg1+ Kxg1 Qb1+ Kg2 Rc6 Qe5+ Kd7 Qxd5+
Rd6 Qb7+ Ke6 Qe7+ Kd5 Qe5+ Kc6 Qe8+ Kb7 h4 b4
Qb5+ Kc8 Qc5+ Kd7 Qa7+ Kc8 Qc5+
24 +1.33 00:38 268465K Qg8 Re4 gxf6 Kc6 Rxf7 Bxf7 Qxf7 Rg4+ Kh1 Qa2 Qe8+
Kc7 Rg1 Rxg1+ Kxg1 Qb1+ Kg2 Rc6 Qe5+ Kd7 Qxd5+
Rd6 Qb7+ Ke6 Qe7+ Kd5 Qe5+ Kc6 Qe8+ Kb7 h4 b4
Qb5+ Kc8 Qc5+ Kd7 Qa7+ Ke6 Qe7+ Kd5 Qe5+ Kc6 h5
Qa2+ Kh3 Qf7 Qc5+ Kd7 cxb4 Rd5 Qa7+ Ke6 Qb6+ Rd6
25 < +1.13 00:40 285250K Qg8 Re4 gxf6 Kc6 Rxf7 Bxf7 Qxf7 Rg4+ Kh1 Qa2 Qe8+
Kc7 Rg1 Rxg1+ Kxg1 Qb1+ Kg2 Rc6 Qe5+ Kd7 Qxd5+
Rd6 Qb7+ Ke6 Qe7+ Kd5 Qe5+ Kc6 Qe8+ Kb7 h4 b4
Qb5+ Kc8 Qc5+ Kd7 Qa7+ Ke6 Qe7+ Kd5 Qe5+ Kc6 h5
Qa2+ Kh3 Qf7 Qc5+ Kd7 cxb4 Qd5 Qxd5 Rxd5
25 < +0.93 00:46 329109K Qg8 Re4 gxf6 Kc6 Rxf7 Bxf7 Qc8+
25 +1.13 00:53 381613K Qg8 Re4 gxf6 Kc6 Rxf7 Bxf7 Qxf7 Rg4+ Kh1 Qa2 Qe8+
Kc7 Rg1 Rxg1+ Kxg1 Qb1+ Kg2 Rc6 Qe5+ Kd7 Qxd5+
Rd6 Qb7+ Ke6 Qe7+ Kd5 Qe5+ Kc6 Qe8+ Kb7 h4 b4
Qb5+ Kc7 Qc5+ Kd7 Qa7+ Kc8 Qa8+ Kc7 Qf3 Qg6+ Kh2
Qf7 Qa8 Kd7 Qa4+ Rc6 Qxb4 Ke8
26 +1.25 01:05 483361K Qg8 Re4 gxf6 Kc6 Rxf7 Bxf7 Qxf7 Rg4+ Kh1 Qa2 Qe8+
Kc7 Rg1 Rxg1+ Kxg1 Qb1+ Kg2 Rc6 Qe5+ Kd7 Qxd5+
Rd6 Qb7+ Ke6 Qe7+ Kd5 Qe5+ Kc6 Qe8+ Kb7 h4 b4
Qb5+ Kc7 Qc5+ Kd7 Qa7+ Kc8 Qa8+ Kc7 Qf3 Qg6+ Kh2
Qh6 Qf2 bxc3
27 < +1.01 01:40 785563K Qg8 Re4 gxf6 Kc6 Rxf7 Bxf7 Qxf7 Rg4+ Kh1 Qa2 Qe8+
Kc7 Rg1 Rxg1+
27 +1.09 02:07 1002M Qg8 Re4 gxf6 Kc6 Rxf7 Bxf7 Qxf7 Rg4+ Kh1 Qa2 Qe8+
Kc7 Rg1 Rxg1+ Kxg1 Qb1+ Kg2 Rc6 Qe5+ Kd7 Qxd5+
Rd6 Qb7+ Ke6 Qe7+ Kd5 Qe5+ Kc6 Qe8+ Kb7 h4 Qf5
Qe5 Qg4+ Qg3 Qxg3+ Kxg3 b4 f7 Rd8 cxb4 Rf8 h5
Rxf7 Kg4 Kc6 Bc5 Kd5 h6 Ke6 b5 Kd5 Be3
28 +1.17 02:41 1294M Qg8 Re4 gxf6 Kc6 Rxf7 Bxf7 Qxf7 Rg4+ Kh1 Qa2 Qe8+
Kc7 Rg1 Rxg1+ Kxg1 Qb1+ Kg2 Rc6 Qe5+ Kd7 Qxd5+
Rd6 Qb7+ Ke6 Qe7+ Kd5 Qe5+ Kc6 Qe8+ Kb7 h4 Qc2+
Kg3 Qd3+ Kf4 b4 Qe5 Rd7 Qe6 Qf1+ Kg3 Qd3+ Kg2
Qc2+ Kg1 Qc1+ Kh2 Qc2+
29 < +1.01 04:10 2116M Qg8 Re4 gxf6 Kc6 Rxf7 Bxf7 Qxf7 Rg4+ Kh1 Qa2 Qe8+
Kc7 Rg1 Rxg1+ Kxg1 Qb1+ Kg2 Rc6
29 < +0.85 05:03 2586M Qg8 Re4 gxf6 Kc6 Rxf7 Bxf7 Qxf7 Rg4+ Kh1 Qa2 Qe8+
Kc7 Rg1 Rxg1+ Kxg1 Qb1+ Kg2 Rc6 Qe5+ Kd7 Qxd5+
Rd6
29 < +0.53 09:34 5047M Qg8 Re4 g6 Rg4+ Kh1 Qa2 Rxf7+ Bxf7 Qxf7+ Kc6 Bf2
29 > +1.33 16:34 8898M Qg8 Re4 gxf6 Kc6 Rxf7 Bxf7 Qxf7 Rg4+ Kh1
29 +0.97 17:59 9657M Qg8 Re4 gxf6 Kc6 Rxf7 Bxf7 Qxf7 Rg4+ Kh1 Qa2 Qe8+
Kc7 Rg1 Rxg1+ Kxg1 Qb1+ Kg2 Rc6 Qe5+ Kd7 Qxd5+
Rd6 Qb7+ Ke6 Qe7+ Kd5 Qe5+ Kc6 Qe8+ Kb7 h4 Qc2+
Kg3 Qd3+ Kf4 b4 Qe5 Rd7 Qe6 Qf1+ Kg3 Qd3+ Kf2
Qc2+ Ke1 Qb1+ Ke2 Qc2+ Kf3
30 +1.09 25:24 13919M Qg8 Re4 gxf6 Kc6 Rxf7 Bxf7 Qxf7 Rg4+ Kh1 Qa2 Qe8+
Kc7 Rg1 Rxg1+ Kxg1 Qb1+ Kg2 Rc6 Qe5+ Kd7 Qxd5+
Rd6 Qb7+ Ke6 Qe7+ Kd5 Qe5+ Kc6 Qe8+ Kb7 h4 Qc2+
Kg3 Qd3+ Kf4 b4 Qe7+ Kc6 Qe1 Qg6 Qe5 b3 Qc5+ Kd7
Qb5+ Kc7 Qc4+ Kd8 Qxb3 Rxf6+ Bxf6+ Qxf6+ Kg4 Qg6+
Kf3 Qf5+ Ke2 Qe4+ Kd2 Qf4+
31 < +0.85 40:01 22511M Qg8 Re4 gxf6 Kc6 Rxf7 Bxf7 Qxf7 Rg4+
31 < +0.61 42:32 23838M Qg8 Re4 gxf6 Kc6
31 > +1.33 48:46 27240M Qg8 Re4 gxf6
31 +0.81 1:17:56 44738M Qg8 Re4 gxf6 Kc6 Rxf7 Bxf7 Qxf7 Rg4+ Kh1 Qa2 Qe8+
Kc7 Rg1 Rxg1+ Kxg1 Qb1+ Kg2 Rc6 Qe5+ Kd7 Qxd5+
Rd6 Qb7+ Ke6 Qe7+ Kd5 Qe5+ Kc6 Qe8+ Kb7 h4 b4
Qb5+ Kc8 Qc5+ Kd7
32 > +1.17 2:27:48 86893M Qg8 Re4 h3 Rxd4 cxd4
32 +1.37 2:43:38 95543M Qg8 Re4 h3 Rxd4 cxd4 Qc3 Rxf7+ Bxf7 Qxf7+ Kc8
Qg8+ Kd7 Qh7+ Kc6 Kg2 Qd2+ Kh1 Qe3 gxf6 Rd8 Qc2+
Kd7 Kh2 Rf8 Qb2 Qd3 Qg2 Kc6 Rf2 Qe3 Qg3 Qxg3+
Kxg3 Kd6 Rb2 Rxf6 Rxb5 Rg6+ Kf4 Rg8 Rb6+ Kc7 Rb3
Re8 Kg5
33 +1.25 2:59:59 104702M Qg8 Re4 h3 Rxd4 cxd4 Qc3 Rxf7+ Bxf7 Qxf7+ Kc8
Qg8+ Kd7 Qh7+ Kc6 Kg2 Qd2+ Kh1 Qe3 gxf6 Rd8 Qc2+
Kd7 Kh2 Rf8 Qb2 Qd3 Qg2 Kc6 Rf2 Qe3 Qg3 Qxg3+
Kxg3 Kd6 Rb2 Rxf6 Rxb5 Rg6+ Kf4 Rf6+ Kg5 Rf1 Rb6+
Kc7
34 +1.25 3:25:41 119483M Qg8 Re4 h3 Rxd4 cxd4 Qc3 Rxf7+ Bxf7 Qxf7+ Kc8
Qg8+ Kd7 Qh7+ Kc6 Kg2 Qd2+ Kh1 Qe3 gxf6 Rd8 Qc2+
Kd7 Kh2 Rf8 Qb2 Qd3 Qg2 Kc6 Rf2 Qe3 Qg3 Qxg3+
Kxg3 Kd6 Rb2 Rxf6 Rxb5 Rg6+ Kf4 Rg1 Rb6+ Kc7
35 < +1.17 4:27:20 156211M Qg8 Re4 h3 Rxd4 cxd4 Qc3 Rxf7+ Bxf7 Qxf7+ Kc6
35 < +1.09 4:59:43 175000M Qg8 Re4
Nodes: 178398415424
Time (ms): 18348421
Nodes/second: 9722821
Best move: Qg8
Ponder move: Re4
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royb
- Posts: 536
- Joined: Thu Mar 09, 2006 12:53 am
Re: Arena 3.0 and Stockfish - bug?
When I fire up Stockfish in analysis mode I get similar results to you -- it chooses Qg8 very quickly and sticks with it forever.zullil wrote:Here Stockfish-2.0.1 (8 threads) goes for Qg8 almost instantly, and never switches back. What time control and how many threads was your Stockfish using?
Code: Select all
Searching: 4b3/3k1n1R/3rrpQ1/qp1p2P1/3B4/2P5/7P/5RK1 w - - infinite: 1 ponder: 0 time: 0 increment: 0 moves to go: 0 1 -0.24 00:00 3930 Rxf7+ 2 -0.24 00:00 4018 Rxf7+ Bxf7 Qxf7+ Re7 3 -0.97 00:00 4562 Rxf7+ Bxf7 Qxf7+ Re7 Qg8 fxg5 Qxg5 3 -0.32 00:00 4995 gxf6 Kd8 Rxf7 Bxf7 Qxf7 4 -0.12 00:00 6478 gxf6 Kd8 Rxf7 Bxf7 Qxf7 Qc7 Qg8+ Re8 5 -0.08 00:00 7520 gxf6 Kd8 Rxf7 Bxf7 Qxf7 Qc7 Qg7 6 > +0.08 00:00 8959 gxf6 Kd8 Rxf7 Bxf7 Qxf7 Qc7 Qxc7+ Kxc7 f7 6 > +0.24 00:00 9590 gxf6 Kd8 Rxf7 Bxf7 Qxf7 Qc7 Qxc7+ Kxc7 f7 6 +0.36 00:00 11617 gxf6 Kd8 Rxf7 Bxf7 Qxf7 Re8 Bc5 Rde6 7 < -0.12 00:00 23890 gxf6 Kc6 Rxf7 Rd7 7 < -0.61 00:00 35109 gxf6 Kc6 Rxf7 Rd7 7 +0.65 00:00 43612 Qg8 Kc6 g6 Ng5 Ra7 Nh3+ Kh1 Qd8 8 +1.01 00:00 61144 Qg8 Kc6 g6 Ng5 Ra7 Qd8 Kh1 Re7 Bxf6 Rxa7 Bxd8 Rxd8 Rf6+ Kb7 9 < +0.48 00:00 91158 Qg8 Kc6 g6 Ng5 Ra7 Qd8 Kh1 Re7 Bxf6 Bxg6 Qxd8 Be4+ Kg1 Rxd8 Bxe7 Nh3# 9 +0.81 00:00 138886 Qg8 Kc6 g6 Ng5 h4 Ne4 Ra7 Qd8 Rfa1 Nc5 Qh7 Rd7 10 > +1.21 00:00 328817 Qg8 Kc6 g6 Ng5 h4 Ne4 Ra7 Qd8 Rfa1 Nc5 g7 10 +1.09 00:00 333430 Qg8 Kc6 g6 Ng5 h4 Ne4 Ra7 Qd8 Rfa1 Nc5 g7 f5 Qf8 Rg6+ Kf1 11 > +1.49 00:00 458004 Qg8 Kc6 g6 Ng5 h4 Ne4 Ra7 Qd8 Rfa1 Nc5 g7 f5 Qf8 Rg6+ Kf1 11 +1.54 00:00 494022 Qg8 Kc6 g6 Ng5 h4 Ne4 Ra7 f5 Qh7 Rxg6+ Kh2 Rd7 Qxg6+ Bxg6 Rxa5 Rd6 Be5 12 +1.45 00:01 1112K Qg8 f5 Rxf7+ Bxf7 Qxf7+ Kc6 Qxf5 Qd8 Ra1 Qc8 Qf1 Rg6 Qf4 Kc7 Ra7+ Kb8 13 +1.66 00:01 1465K Qg8 f5 Rxf7+ Bxf7 Qxf7+ Kc6 Qxf5 Qd8 Be5 Rg6 h4 Rde6 Ra1 Qe7 Kh2 Kb7 Kg3 Ra6 Rb1 14 < +1.41 00:01 2430K Qg8 f5 Rxf7+ Bxf7 Qxf7+ Kc6 Qxf5 Re8 h4 Rde6 h5 Qc7 h6 Qg3+ Kh1 Qh4+ Kg2 Re2+ 14 < +1.17 00:01 3140K Qg8 f5 Rxf7+ Bxf7 Qxf7+ Kc6 Qxf5 Re8 h4 Rde6 h5 Qc7 h6 Qg3+ Kh1 Qh4+ Kg2 Re2+ 14 +1.41 00:01 4340K Qg8 f5 Rxf7+ Bxf7 Qxf7+ Kc6 Qxf5 Re8 g6 Qc7 g7 Rh6 Qc2 Qd6 Ra1 Qg6+ Qg2 Qxg2+ Kxg2 Rhe6 Kf3 R6e7 Ra6+ Kd7 Rb6 Rg8 Rxb5 15 < +1.05 00:01 5640K Qg8 f5 Rxf7+ Bxf7 Qxf7+ Kc6 Qxf5 Re8 g6 Qc7 g7 Rh6 Qc2 Qd6 Ra1 Qg6+ Qg2 Qxg2+ Kxg2 Rhe6 Kf3 Re4 Ra5 Rg8 15 +1.01 00:02 8001K Qg8 f5 Rxf7+ Bxf7 Qxf7+ Kc6 Qxf5 Re8 g6 Qc7 g7 Rh6 Qc2 Qd6 Ra1 Qg6+ Qxg6+ Rxg6+ Kf2 Rg4 Kf3 Rge4 Ra6+ Kd7 Rb6 Rg8 Rxb5 Ke6 h3 Kd6 Kg3 Ke6 h4 Re2 16 +1.01 00:02 9104K Qg8 f5 Rxf7+ Bxf7 Qxf7+ Kc6 Qxf5 Re8 g6 Qc7 g7 Rh6 Qc2 Qd6 Ra1 Qg6+ Qxg6+ Rxg6+ Kf2 Rg4 Kf3 Rge4 Ra6+ Kd7 Rb6 Rg8 Rxb5 Ke6 h3 Kd6 Kg3 Ke6 h4 Re2 17 > +1.21 00:02 9828K Qg8 f5 Rxf7+ Bxf7 Qxf7+ Kc6 Qxf5 Re8 g6 Qc7 g7 Rh6 Qc2 Qd6 Ra1 Qg6+ Qxg6+ Rxg6+ Kf2 Rg4 Kf3 Rge4 Ra6+ Kd7 Rb6 Rg8 Rxb5 Ke6 h3 Kd6 Kg3 Ke6 h4 Re2 h5 17 +1.05 00:02 10444K Qg8 f5 Rxf7+ Bxf7 Qxf7+ Kc6 Qxf5 Re8 g6 Qc7 g7 Rh6 Qc2 Qd6 Ra1 Qg6+ Qxg6+ Rxg6+ Kf2 Rg4 Kf3 Rge4 Ra6+ Kd7 Rb6 Rg8 Rxb5 Ke6 h3 Kd6 Kg3 Ke6 h4 Re2 h5 18 > +1.13 00:02 11016K Qg8 f5 Rxf7+ Bxf7 Qxf7+ Kc6 Qxf5 Re8 g6 Qc7 g7 Rh6 Qc2 Qd6 Ra1 Qg6+ Qxg6+ Rxg6+ Kf2 Rg4 Kf3 Rge4 Ra6+ Kd7 Rb6 Rg8 Rxb5 Ke6 h3 Kd6 Kg3 Ke6 h4 Re2 h5 18 < +0.97 00:03 13383K Qg8 Kc6 g6 Ng5 h4 Nf3+ Rxf3 Qa2 Bf2 Qb1+ Kh2 Qxg6 Rg7 Qe4 Kg2 f5 h5 Rd7 18 < +0.89 00:03 13995K Qg8 Kc6 g6 Ng5 h4 Nf3+ Rxf3 Qa2 Bf2 Qb1+ Kh2 Qxg6 Rg7 Qe4 Kg2 f5 h5 Rd7 18 > +1.21 00:03 15155K Qg8 Kc6 g6 Ng5 Ra7 Qd8 Rfa1 Nf3+ Kh1 Nxd4 cxd4 b4 g7 Re7 R1a6+ Kb5 Qh7 Rxa6 Qd3+ 18 +1.05 00:04 20349K Qg8 f5 Rxf7+ Bxf7 Qxf7+ Kc6 Qxf5 Re8 g6 Qc7 g7 Rh6 Qc2 Qd6 Ra1 Qg6+ Qxg6+ Rxg6+ Kf2 Rg4 Kf3 Rge4 Ra6+ Kd7 Rb6 Rg8 Rxb5 Ke6 h3 Kd6 Kg3 Ke6 h4 Re2 h5 19 > +1.13 00:04 21681K Qg8 f5 Rxf7+ Bxf7 Qxf7+ Kc6 Qxf5 Re8 g6 Qc7 g7 Rh6 Qc2 Qd6 Ra1 Qg6+ Qxg6+ Rxg6+ Kf2 Rg4 Kf3 Rge4 Ra6+ Kd7 Rb6 Rg8 Rxb5 Ke6 h3 Kd6 Kg3 Ke6 h4 Re2 h5 19 > +1.21 00:04 22205K Qg8 f5 Rxf7+ Bxf7 Qxf7+ Kc6 Qxf5 Re8 g6 Qc7 g7 Rh6 Qc2 Qd6 Ra1 Qg6+ Qxg6+ Rxg6+ Kf2 Rg4 Kf3 Rge4 Ra6+ Kd7 Rb6 Rg8 Rxb5 Ke6 h3 Kd6 Kg3 Ke6 h4 Re2 h5 19 +1.21 00:04 23178K Qg8 f5 Rxf7+ Bxf7 Qxf7+ Kc6 Qxf5 Re8 g6 Qc7 g7 Rh6 Qc2 Qd6 Ra1 Qg6+ Qxg6+ Rxg6+ Kf2 Rg4 Kf3 Rge4 Ra6+ Kd7 Rb6 Rg8 Rxb5 Ke6 h3 Rh4 Kg3 Re4 h4 Re2 h5 20 > +1.37 00:05 27874K Qg8 f5 Rxf7+ Bxf7 Qxf7+ Kc6 Qxf5 Re8 g6 Qc7 Ra1 Qc8 Qh5 Re4 h3 b4 g7 bxc3 Bxc3 20 > +1.54 00:06 31121K Qg8 f5 Rxf7+ Bxf7 Qxf7+ Kc6 Qxf5 Qd8 Be5 Rg6 h4 Rde6 Ra1 Qe7 Bg3 Qc5+ Bf2 Qxc3 Ra6+ Kc7 Rxe6 20 < +1.05 00:07 44451K Qg8 Re4 g6 Rg4+ Kh1 Qa2 Rg1 Rxg1+ Bxg1 d4 gxf7 Qd5+ Qg2 Qxg2+ Kxg2 Bxf7 Rxf7+ Ke8 20 < +0.89 00:08 47699K Qg8 Re4 g6 Rg4+ Kh1 Qa2 Rg1 Rxg1+ Bxg1 d4 gxf7 Qd5+ Qg2 Qxg2+ Kxg2 Bxf7 Rxf7+ Ke8 Rb7 d3 Rb8+ Kd7 Rxb5 d2 Rb7+ Ke8 20 < +0.57 00:09 55135K Qg8 Re4 g6 Rg4+ Kh1 Qa2 Rg1 Rxg1+ Bxg1 d4 gxf7 Qd5+ Qg2 Qxg2+ Kxg2 Bxf7 Rxf7+ Ke8 Rb7 d3 h4 d2 Rb8+ Kd7 20 +0.89 00:18 120359K Qg8 Re4 gxf6 Kc6 Rxf7 Bxf7 Qxf7 Rg4+ Kh1 Qa2 Qe8+ Kc7 Rg1 Rxg1+ Kxg1 Qb1+ Kg2 Qc2+ Kg3 Qd3+ Kg4 Qd1+ Kh4 b4 Qe7+ Kc6 Ba7 d4 Bb8 dxc3 Qc7+ Kb5 Qxd6 c2 Qe5+ Kc4 Qf4+ Kb3 Qe3+ Ka2 21 > +1.29 00:20 139510K Qg8 Re4 gxf6 Kc6 Rxf7 Bxf7 Qxf7 Rg4+ Kh1 Qa2 Qe8+ Kc7 Rg1 Rxg1+ Kxg1 Qb1+ Kg2 Qc2+ Kg3 Qd3+ Kg4 Qd1+ Kh4 b4 Be5 Qe1+ Kg5 Qe3+ Kg6 Qe4+ Kg7 Qg4+ Kf8 bxc3 Qe7+ 21 +1.25 00:21 146523K Qg8 Re4 gxf6 Kc6 Rxf7 Bxf7 Qxf7 Rg4+ Kh1 Qa2 Qe8+ Kc7 Rg1 Rxg1+ Kxg1 Qb1+ Kg2 Rc6 Qe5+ Kd7 Qxd5+ Rd6 Qb7+ Ke6 Qe7+ Kd5 Qe5+ Kc6 h4 Qg6+ Kh2 Qc2+ Kh3 Qd3+ Kg4 Qd1+ Kf4 Qd2+ Kf3 Qd3+ Kf2 Qc2+ Kg3 Qd3+ Kg4 22 +1.21 00:27 188764K Qg8 Re4 gxf6 Kc6 Rxf7 Bxf7 Qxf7 Rg4+ Kh1 Qa2 Qe8+ Kc7 Rg1 Rxg1+ Kxg1 Qb1+ Kg2 Rc6 Qe5+ Kd7 Qxd5+ Rd6 Qb7+ Ke6 Qe7+ Kd5 Qe5+ Kc6 Qe8+ Kd5 Qh5+ Ke6 Qe5+ Kd7 h4 Qc2+ Kg3 Qd3+ Kf4 Qd2+ Kf5 Qd3+ Kg5 b4 Qe7+ Kc6 Be5 Qd2+ Kg6 Qd3+ Kg7 Rd7 23 < +0.97 00:32 228074K Qg8 Re4 gxf6 Kc6 Rxf7 Bxf7 Qxf7 Rg4+ Kh1 Qa2 Qe8+ Kc7 Rg1 Rxg1+ Kxg1 Qb1+ Kg2 Rc6 Qe5+ Kd7 Qxd5+ Rd6 Qb7+ Ke6 Qe7+ Kd5 Qe5+ Kc6 Qe8+ Kb7 Kg3 Qd3+ Kh4 b4 Qe7+ Kc6 f7 Rh6+ Kg5 Rg6+ Kf4 Qf1+ Ke4 Qg2+ 23 > +1.45 00:34 242706K Qg8 Re4 gxf6 Kc6 Rxf7 Bxf7 Qxf7 Rg4+ Kh1 Qa2 Qe8+ Kc7 Rg1 Rxg1+ Kxg1 Qb1+ Kg2 Rc6 Qe5+ Kd7 Qxd5+ Rd6 Qb7+ Ke6 Qe7+ Kd5 Qe5+ Kc6 Qe8+ Kb7 h4 b4 Qb5+ Kc8 Qc5+ Kd7 Qa7+ Kc8 Qe7 Qg6+ Kh2 Qc2+ Kg3 Qd3+ Kf4 Qd2+ Kf3 Qd3+ Kf2 Qf5+ Kg3 23 +1.41 00:35 250919K Qg8 Re4 gxf6 Kc6 Rxf7 Bxf7 Qxf7 Rg4+ Kh1 Qa2 Qe8+ Kc7 Rg1 Rxg1+ Kxg1 Qb1+ Kg2 Rc6 Qe5+ Kd7 Qxd5+ Rd6 Qb7+ Ke6 Qe7+ Kd5 Qe5+ Kc6 Qe8+ Kb7 h4 b4 Qb5+ Kc8 Qc5+ Kd7 Qa7+ Kc8 Qe7 Qg6+ Kh2 Qc2+ Kg3 Qd3+ Kf4 Qf1+ Ke5 Rd7 24 < +1.17 00:36 255097K Qg8 Re4 gxf6 Kc6 Rxf7 Bxf7 Qxf7 Rg4+ Kh1 Qa2 Qe8+ Kc7 Rg1 Rxg1+ Kxg1 Qb1+ Kg2 Rc6 Qe5+ Kd7 Qxd5+ Rd6 Qb7+ Ke6 Qe7+ Kd5 Qe5+ Kc6 Qe8+ Kb7 h4 b4 Qb5+ Kc8 Qc5+ Kd7 Qa7+ Kc8 Qc5+ 24 +1.33 00:38 268465K Qg8 Re4 gxf6 Kc6 Rxf7 Bxf7 Qxf7 Rg4+ Kh1 Qa2 Qe8+ Kc7 Rg1 Rxg1+ Kxg1 Qb1+ Kg2 Rc6 Qe5+ Kd7 Qxd5+ Rd6 Qb7+ Ke6 Qe7+ Kd5 Qe5+ Kc6 Qe8+ Kb7 h4 b4 Qb5+ Kc8 Qc5+ Kd7 Qa7+ Ke6 Qe7+ Kd5 Qe5+ Kc6 h5 Qa2+ Kh3 Qf7 Qc5+ Kd7 cxb4 Rd5 Qa7+ Ke6 Qb6+ Rd6 25 < +1.13 00:40 285250K Qg8 Re4 gxf6 Kc6 Rxf7 Bxf7 Qxf7 Rg4+ Kh1 Qa2 Qe8+ Kc7 Rg1 Rxg1+ Kxg1 Qb1+ Kg2 Rc6 Qe5+ Kd7 Qxd5+ Rd6 Qb7+ Ke6 Qe7+ Kd5 Qe5+ Kc6 Qe8+ Kb7 h4 b4 Qb5+ Kc8 Qc5+ Kd7 Qa7+ Ke6 Qe7+ Kd5 Qe5+ Kc6 h5 Qa2+ Kh3 Qf7 Qc5+ Kd7 cxb4 Qd5 Qxd5 Rxd5 25 < +0.93 00:46 329109K Qg8 Re4 gxf6 Kc6 Rxf7 Bxf7 Qc8+ 25 +1.13 00:53 381613K Qg8 Re4 gxf6 Kc6 Rxf7 Bxf7 Qxf7 Rg4+ Kh1 Qa2 Qe8+ Kc7 Rg1 Rxg1+ Kxg1 Qb1+ Kg2 Rc6 Qe5+ Kd7 Qxd5+ Rd6 Qb7+ Ke6 Qe7+ Kd5 Qe5+ Kc6 Qe8+ Kb7 h4 b4 Qb5+ Kc7 Qc5+ Kd7 Qa7+ Kc8 Qa8+ Kc7 Qf3 Qg6+ Kh2 Qf7 Qa8 Kd7 Qa4+ Rc6 Qxb4 Ke8 26 +1.25 01:05 483361K Qg8 Re4 gxf6 Kc6 Rxf7 Bxf7 Qxf7 Rg4+ Kh1 Qa2 Qe8+ Kc7 Rg1 Rxg1+ Kxg1 Qb1+ Kg2 Rc6 Qe5+ Kd7 Qxd5+ Rd6 Qb7+ Ke6 Qe7+ Kd5 Qe5+ Kc6 Qe8+ Kb7 h4 b4 Qb5+ Kc7 Qc5+ Kd7 Qa7+ Kc8 Qa8+ Kc7 Qf3 Qg6+ Kh2 Qh6 Qf2 bxc3 27 < +1.01 01:40 785563K Qg8 Re4 gxf6 Kc6 Rxf7 Bxf7 Qxf7 Rg4+ Kh1 Qa2 Qe8+ Kc7 Rg1 Rxg1+ 27 +1.09 02:07 1002M Qg8 Re4 gxf6 Kc6 Rxf7 Bxf7 Qxf7 Rg4+ Kh1 Qa2 Qe8+ Kc7 Rg1 Rxg1+ Kxg1 Qb1+ Kg2 Rc6 Qe5+ Kd7 Qxd5+ Rd6 Qb7+ Ke6 Qe7+ Kd5 Qe5+ Kc6 Qe8+ Kb7 h4 Qf5 Qe5 Qg4+ Qg3 Qxg3+ Kxg3 b4 f7 Rd8 cxb4 Rf8 h5 Rxf7 Kg4 Kc6 Bc5 Kd5 h6 Ke6 b5 Kd5 Be3 28 +1.17 02:41 1294M Qg8 Re4 gxf6 Kc6 Rxf7 Bxf7 Qxf7 Rg4+ Kh1 Qa2 Qe8+ Kc7 Rg1 Rxg1+ Kxg1 Qb1+ Kg2 Rc6 Qe5+ Kd7 Qxd5+ Rd6 Qb7+ Ke6 Qe7+ Kd5 Qe5+ Kc6 Qe8+ Kb7 h4 Qc2+ Kg3 Qd3+ Kf4 b4 Qe5 Rd7 Qe6 Qf1+ Kg3 Qd3+ Kg2 Qc2+ Kg1 Qc1+ Kh2 Qc2+ 29 < +1.01 04:10 2116M Qg8 Re4 gxf6 Kc6 Rxf7 Bxf7 Qxf7 Rg4+ Kh1 Qa2 Qe8+ Kc7 Rg1 Rxg1+ Kxg1 Qb1+ Kg2 Rc6 29 < +0.85 05:03 2586M Qg8 Re4 gxf6 Kc6 Rxf7 Bxf7 Qxf7 Rg4+ Kh1 Qa2 Qe8+ Kc7 Rg1 Rxg1+ Kxg1 Qb1+ Kg2 Rc6 Qe5+ Kd7 Qxd5+ Rd6 29 < +0.53 09:34 5047M Qg8 Re4 g6 Rg4+ Kh1 Qa2 Rxf7+ Bxf7 Qxf7+ Kc6 Bf2 29 > +1.33 16:34 8898M Qg8 Re4 gxf6 Kc6 Rxf7 Bxf7 Qxf7 Rg4+ Kh1 29 +0.97 17:59 9657M Qg8 Re4 gxf6 Kc6 Rxf7 Bxf7 Qxf7 Rg4+ Kh1 Qa2 Qe8+ Kc7 Rg1 Rxg1+ Kxg1 Qb1+ Kg2 Rc6 Qe5+ Kd7 Qxd5+ Rd6 Qb7+ Ke6 Qe7+ Kd5 Qe5+ Kc6 Qe8+ Kb7 h4 Qc2+ Kg3 Qd3+ Kf4 b4 Qe5 Rd7 Qe6 Qf1+ Kg3 Qd3+ Kf2 Qc2+ Ke1 Qb1+ Ke2 Qc2+ Kf3 30 +1.09 25:24 13919M Qg8 Re4 gxf6 Kc6 Rxf7 Bxf7 Qxf7 Rg4+ Kh1 Qa2 Qe8+ Kc7 Rg1 Rxg1+ Kxg1 Qb1+ Kg2 Rc6 Qe5+ Kd7 Qxd5+ Rd6 Qb7+ Ke6 Qe7+ Kd5 Qe5+ Kc6 Qe8+ Kb7 h4 Qc2+ Kg3 Qd3+ Kf4 b4 Qe7+ Kc6 Qe1 Qg6 Qe5 b3 Qc5+ Kd7 Qb5+ Kc7 Qc4+ Kd8 Qxb3 Rxf6+ Bxf6+ Qxf6+ Kg4 Qg6+ Kf3 Qf5+ Ke2 Qe4+ Kd2 Qf4+ 31 < +0.85 40:01 22511M Qg8 Re4 gxf6 Kc6 Rxf7 Bxf7 Qxf7 Rg4+ 31 < +0.61 42:32 23838M Qg8 Re4 gxf6 Kc6 31 > +1.33 48:46 27240M Qg8 Re4 gxf6 31 +0.81 1:17:56 44738M Qg8 Re4 gxf6 Kc6 Rxf7 Bxf7 Qxf7 Rg4+ Kh1 Qa2 Qe8+ Kc7 Rg1 Rxg1+ Kxg1 Qb1+ Kg2 Rc6 Qe5+ Kd7 Qxd5+ Rd6 Qb7+ Ke6 Qe7+ Kd5 Qe5+ Kc6 Qe8+ Kb7 h4 b4 Qb5+ Kc8 Qc5+ Kd7 32 > +1.17 2:27:48 86893M Qg8 Re4 h3 Rxd4 cxd4 32 +1.37 2:43:38 95543M Qg8 Re4 h3 Rxd4 cxd4 Qc3 Rxf7+ Bxf7 Qxf7+ Kc8 Qg8+ Kd7 Qh7+ Kc6 Kg2 Qd2+ Kh1 Qe3 gxf6 Rd8 Qc2+ Kd7 Kh2 Rf8 Qb2 Qd3 Qg2 Kc6 Rf2 Qe3 Qg3 Qxg3+ Kxg3 Kd6 Rb2 Rxf6 Rxb5 Rg6+ Kf4 Rg8 Rb6+ Kc7 Rb3 Re8 Kg5 33 +1.25 2:59:59 104702M Qg8 Re4 h3 Rxd4 cxd4 Qc3 Rxf7+ Bxf7 Qxf7+ Kc8 Qg8+ Kd7 Qh7+ Kc6 Kg2 Qd2+ Kh1 Qe3 gxf6 Rd8 Qc2+ Kd7 Kh2 Rf8 Qb2 Qd3 Qg2 Kc6 Rf2 Qe3 Qg3 Qxg3+ Kxg3 Kd6 Rb2 Rxf6 Rxb5 Rg6+ Kf4 Rf6+ Kg5 Rf1 Rb6+ Kc7 34 +1.25 3:25:41 119483M Qg8 Re4 h3 Rxd4 cxd4 Qc3 Rxf7+ Bxf7 Qxf7+ Kc8 Qg8+ Kd7 Qh7+ Kc6 Kg2 Qd2+ Kh1 Qe3 gxf6 Rd8 Qc2+ Kd7 Kh2 Rf8 Qb2 Qd3 Qg2 Kc6 Rf2 Qe3 Qg3 Qxg3+ Kxg3 Kd6 Rb2 Rxf6 Rxb5 Rg6+ Kf4 Rg1 Rb6+ Kc7 35 < +1.17 4:27:20 156211M Qg8 Re4 h3 Rxd4 cxd4 Qc3 Rxf7+ Bxf7 Qxf7+ Kc6 35 < +1.09 4:59:43 175000M Qg8 Re4 Nodes: 178398415424 Time (ms): 18348421 Nodes/second: 9722821 Best move: Qg8 Ponder move: Re4
Time control was 40 moves in 15 minutes and only 1 thread was used.
Roy
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zullil
- Posts: 6442
- Joined: Tue Jan 09, 2007 12:31 am
- Location: PA USA
- Full name: Louis Zulli
Re: Arena 3.0 and Stockfish - bug?
Hard to understand how Arena got the other move. I don't know much about Arena, but a log of UCI communications from/to Stockfish would be helpful here.
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hgm
- Posts: 27819
- Joined: Fri Mar 10, 2006 10:06 am
- Location: Amsterdam
- Full name: H G Muller
Re: Arena 3.0 and Stockfish - bug?
UCI is a very error-prone protocol. If the GUI somehow messes up the position, there is no way the engine can catch it. It is simply sent the wrong position as new one to think on. You couldn't fool a WinBoard engine that way; if the GUI doesn't move as it said, you will run into an Illegal-Move error message sooner or later!
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Guenther
- Posts: 4611
- Joined: Wed Oct 01, 2008 6:33 am
- Location: Regensburg, Germany
- Full name: Guenther Simon
Re: Arena 3.0 and Stockfish - bug?
Well, if Uri is right(I haven't looked yet at the Stockfish code) it has nothingzullil wrote:Hard to understand how Arena got the other move. I don't know much about Arena, but a log of UCI communications from/to Stockfish would be helpful here.
to do with Arena, but is a Stockfish 'feature'.
Guenther
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Eelco de Groot
- Posts: 4567
- Joined: Sun Mar 12, 2006 2:40 am
- Full name:
Re: Arena 3.0 and Stockfish - bug?
Just looking at the output above gxf6 is only chosen for 7 plies and then makes a big drop in value. It would be possible that Qg8 then fails high and if the Fail High is then researched with a new window but turns out lower than the previous best move, there is no new PV and there would be no PV for the move chosen. Also if a Fail High search is running out of time I suppose Stockfish could break it off and revert to the previous best move. I'm not sure exactly what the code does then but it would be logical. But I think Stockfish was searching much deeper at this timecontrol than 7 plies and Arena also does not show any fail high sign for the PV of Qg8 so that all looks a bit suspicious to me.Guenther wrote:Well, if Uri is right(I haven't looked yet at the Stockfish code) it has nothingzullil wrote:Hard to understand how Arena got the other move. I don't know much about Arena, but a log of UCI communications from/to Stockfish would be helpful here.
to do with Arena, but is a Stockfish 'feature'.
Guenther
Regards, Eelco
Debugging is twice as hard as writing the code in the first
place. Therefore, if you write the code as cleverly as possible, you
are, by definition, not smart enough to debug it.
-- Brian W. Kernighan
place. Therefore, if you write the code as cleverly as possible, you
are, by definition, not smart enough to debug it.
-- Brian W. Kernighan