Stockfish 1.7.1 64-bit 4CPU - gauntlet (CCRL 40/40)

[Martin Thoresen]

I think that the game will be okay. It's only if both sides believe that the winning engine has an advantage of 0.70 or more for the entire game that it's considered a bad opening.

Cheers,
Graham.

Great Graham, I didn't remember that it was 0.70 though. Good to be back!

[Dann Corbit]

Looking at the engine scores, Deep Fritz was totally blind to the problem for several steps, though Stockfish knew it had the upper hand.

[Tord Romstad]

Tord,

I am not sure that game is very valid, seems to be a dubious
opening if you ask me. But fun, oh yeah! It might get filtrated
out of the CCRL database when I upload it for the rating list,
I am not sure however since I think I can remember that both
engines have to have a evaluation out of book of less than one
half pawn; in this case DF 12 is almost at zero but on the other
hand Stockfish is claiming over a pawn advantage out of book.

The book line looks OK to me. The position out of book looks roughly equal, but Fritz's first move out of book (9. a4, with a score of +0.07) is a blunder. After (for instance) 9. Be2, white would have had no problems.

Of course, 10. Bxd8?? is a far worse blunder. It's strange that a program as strong as Fritz misses such tactics at a time control like this.

[Martin Thoresen]

The book line looks OK to me. The position out of book looks roughly equal, but Fritz's first move out of book (9. a4, with a score of +0.07) is a blunder. After (for instance) 9. Be2, white would have had no problems.

Of course, 10. Bxd8?? is a far worse blunder. It's strange that a program as strong as Fritz misses such tactics at a time control like this.

Okay nice, I haven't had the time to analyze the game but it sure looks extremely "crushing".

I agree, people say Fritz has become less and less tactical ever
since the infamous "10.1" version. Perhaps they are right.

Anyway, impressive performance by Stockfish so far.
I must congratulate you and your team for this achievement.

Edit: Also, I must ask this. After currently having played 85 games,
Stockfish has 4 losses (1 to Rybka, 2 to Naum and 1 to Sjeng).
Do you guys often play through games like these to see where/how
Stockfish went wrong? Is there anything to be learned from single
losses like these?

[Bob Yellow]

Strange.One second and move 10.Bxd8... eval -/+ -1.30

Analysis by Deep Fritz 12:

10.Bxd8 Bxf2+ 11.Ke2 Bg4+ 12.Kd3 Bxd1 13.Nxe4 Nb4+ 14.Kc4 Nxc2 15.Nxf2 d5+ 16.Kc3 Nxa1 17.Nxa1
+/- (1.39) Depth: 11/24 00:00:00 128kN
10.Bxd8 Bxf2+ 11.Ke2 Bg4+ 12.Kd3 Bxd1 13.Nxe4 Nb4+ 14.Kc3 Be1+ 15.Nbd2 Bxd2+ 16.Nxd2 Nd5+ 17.Kd4 Bxc2 18.Bh4 c6 19.Re1+
+- (1.44) Depth: 12/28 00:00:00 242kN
10.Bxd8 Bxf2+ 11.Ke2 Bg4+ 12.Kd3 Bxd1 13.Nxe4 Nb4+ 14.Kc3 Be1+ 15.Nbd2 Bxd2+ 16.Nxd2 Nd5+ 17.Kd4 Bxc2 18.Bh4 Nf4 19.Bb5+ c6
+- (1.49) Depth: 13/31 00:00:00 425kN
10.Bxd8 Bxf2+ 11.Ke2 Bg4+ 12.Kd3 Bxd1 13.Nxe4 Nb4+ 14.Kc3 Be1+ 15.Nbd2 Bxd2+ 16.Nxd2 Nd5+ 17.Kd4 Bxc2 18.Bh4 Nf4 19.Bb5+ c6 20.Rhe1+
+- (1.61) Depth: 14/31 00:00:00 861kN
10.Bxd8 Bxf2+ 11.Ke2 Bg4+ 12.Kd3 Bxd1 13.Nxe4 Nb4+ 14.Kc3 Be1+ 15.Nbd2 Bxd2+ 16.Nxd2 Nd5+ 17.Kd4 Bxc2 18.Bh4 Nf4 19.Bb5+ Kf8 20.Rhg1 Bf5
+- (1.62) Depth: 15/32 00:00:00 1568kN
10.Bxd8 Bxf2+ 11.Ke2 Bg4+ 12.Kd3 Ne5+ 13.Kxe4 f5+ 14.Kd5 Rxd8 15.Qxg4 Nxg4 16.Ke6 0-0 17.Nd5 Rde8+ 18.Ne7+ Kh7 19.Bb5 c6 20.Bd3 Rf6+ 21.Kd7
+- (1.55) Depth: 16/39 00:00:00 4695kN
10.Bxd8 Bxf2+ 11.Ke2 Bg4+ 12.Kd3 Ne5+ 13.Kxe4 f5+ 14.Kd5 Rxd8 15.Qxg4 Nxg4 16.Kc4 Kd7 17.g3 Ne3+ 18.Kd3 Rhe8 19.Be2 c5 20.Kd2 Kc7
+- (1.41) Depth: 17/44 00:00:00 7414kN
10.Bxd8 Bxf2+ 11.Ke2 Bg4+ 12.Kd3 Ne5+ 13.Kxe4 f5+ 14.Kd5 Rxd8 15.Qxg4 Nxg4 16.Kc4 d5+ 17.Kb4 d4 18.Nd1 Bh4 19.Nc5 Be7 20.Bc4 b6 21.Bb5+ Kf7
+/- (1.32) Depth: 18/40 00:00:01 12525kN
10.Bxd8 Bxf2+ 11.Ke2 Bg4+ 12.Kd3 Ne5+ 13.Kxe4 f5+ 14.Kd5 Rxd8 15.Qxg4 c6+ 16.Ke6 fxg4 17.h4 gxh3 18.Ra3 hxg2 19.Bxg2 0-0 20.Ne4 Rde8+ 21.Kxd6 Nc4+ 22.Kd7 Rd8+ 23.Ke6 Nxa3 24.bxa3
-/+ (-1.30) Depth: 19/41 00:00:01 18775kN
10.Qh5 Nf6 11.Qe2+ Be6 12.a5 Bd4 13.Nxd4 Nxd4 14.Qd2 Nf5 15.Bxf6 Qxf6 16.Bd3 0-0 17.0-0 Nd4 18.Ne4 Qe7 19.Qe3 Nf5 20.Qf4 Rfe8
-/+ (-1.25) Depth: 19/44 00:00:13 172mN
10.Qh5 Nf6 11.Qe2+ Be6 12.a5 Bd4 13.Nxd4 Nxd4 14.Qd2 Nf5 15.Bxf6 Qxf6 16.Bd3 0-0 17.0-0 Rfe8 18.a6 b6 19.Bb5 Re7
-/+ (-1.26) Depth: 20/45 00:00:20 263mN

[Martin Thoresen]

After 112 of 400 games:

Code: Select all

Stockfish_171_Gauntlet_CCRL  2010

Stockfish 1.7.1 64-bit 4CPU   - Deep Fritz 12 4CPU                11.5 - 2.5    +9/=5/-0    82.14%
Stockfish 1.7.1 64-bit 4CPU   - Deep Shredder 12 64-bit 4CPU      10.5 - 3.5    +7/=7/-0    75.00%
Stockfish 1.7.1 64-bit 4CPU   - Deep Sjeng WC2008 64-bit 4CPU     11.5 - 2.5    +10/=3/-1   82.14%
Stockfish 1.7.1 64-bit 4CPU   - Komodo 1.0 64-bit                 11.5 - 2.5    +9/=5/-0    82.14%
Stockfish 1.7.1 64-bit 4CPU   - Naum 4.2 64-bit 4CPU              9.0 - 5.0     +6/=6/-2    64.29%
Stockfish 1.7.1 64-bit 4CPU   - Rybka 3 64-bit 4CPU               7.5 - 6.5     +3/=9/-2    53.57%
Stockfish 1.7.1 64-bit 4CPU   - Spark 0.4 64-bit 4CPU             11.5 - 2.5    +9/=5/-0    82.14%
Stockfish 1.7.1 64-bit 4CPU   - Zappa Mexico II 64-bit 4CPU       10.0 - 4.0    +7/=6/-1    71.43%

Download games: 81-112

[Martin Thoresen]

After 152 of 400 games:

Code: Select all

Stockfish_171_Gauntlet_CCRL  2010

Stockfish 1.7.1 64-bit 4CPU   - Deep Fritz 12 4CPU                15.5 - 3.5    +12/=7/-0    81.58%
Stockfish 1.7.1 64-bit 4CPU   - Deep Shredder 12 64-bit 4CPU      13.0 - 6.0    +8/=10/-1    68.42%
Stockfish 1.7.1 64-bit 4CPU   - Deep Sjeng WC2008 64-bit 4CPU     16.5 - 2.5    +15/=3/-1    86.84%
Stockfish 1.7.1 64-bit 4CPU   - Komodo 1.0 64-bit                 14.5 - 4.5    +11/=7/-1    76.32%
Stockfish 1.7.1 64-bit 4CPU   - Naum 4.2 64-bit 4CPU              12.0 - 7.0    +7/=10/-2    63.16%
Stockfish 1.7.1 64-bit 4CPU   - Rybka 3 64-bit 4CPU               10.0 - 9.0    +5/=10/-4    52.63%
Stockfish 1.7.1 64-bit 4CPU   - Spark 0.4 64-bit 4CPU             15.5 - 3.5    +12/=7/-0    81.58%
Stockfish 1.7.1 64-bit 4CPU   - Zappa Mexico II 64-bit 4CPU       14.5 - 4.5    +11/=7/-1    76.32%

Download games: 113-152

[jdart]

Several impressive games by Stockfish.

Stockfish-Deep Sjeng: Nice q-side attack starting with N3a4 here (Stockfish had a big eval jump as of this move):

[d] r1r2nk1/1p1b1pbp/p4np1/P1Np2q1/1P1Pp3/B1N1P3/Q3BPPP/RR4K1 w - -

also an interesting endgame in Stockfish-Deep Fritz, where Stockfish also saw a win ahead of its opponent. This is one key position (Kg2 wins):

[d] 8/8/5R2/3k1p1r/5P2/4P1K1/8/8 w - -

[Martin Thoresen]

After 224 of 400 games:

Code: Select all

Stockfish_171_Gauntlet_CCRL  2010

Stockfish 1.7.1 64-bit 4CPU   - Deep Fritz 12 4CPU                19.5 - 8.5    +13/=13/-2    69.64%
Stockfish 1.7.1 64-bit 4CPU   - Deep Shredder 12 64-bit 4CPU      21.0 - 7.0    +15/=12/-1    75.00%
Stockfish 1.7.1 64-bit 4CPU   - Deep Sjeng WC2008 64-bit 4CPU     23.5 - 4.5    +21/=5/-2     83.93%
Stockfish 1.7.1 64-bit 4CPU   - Komodo 1.0 64-bit                 22.5 - 5.5    +18/=9/-1     80.36%
Stockfish 1.7.1 64-bit 4CPU   - Naum 4.2 64-bit 4CPU              16.5 - 11.5    +9/=15/-4    58.93%
Stockfish 1.7.1 64-bit 4CPU   - Rybka 3 64-bit 4CPU               15.0 - 13.0    +6/=18/-4    53.57%
Stockfish 1.7.1 64-bit 4CPU   - Spark 0.4 64-bit 4CPU             22.0 - 6.0    +17/=10/-1    78.57%
Stockfish 1.7.1 64-bit 4CPU   - Zappa Mexico II 64-bit 4CPU       19.5 - 8.5    +13/=13/-2    69.64%

Download games: 153-224

[Martin Thoresen]

After 280 of 400 games:

Code: Select all

Stockfish_171_Gauntlet_CCRL  2010

Stockfish 1.7.1 64-bit 4CPU   - Deep Fritz 12 4CPU                23.0 - 12.0    +14/=18/-3    65.71%
Stockfish 1.7.1 64-bit 4CPU   - Deep Shredder 12 64-bit 4CPU      25.0 - 10.0    +16/=18/-1    71.43%
Stockfish 1.7.1 64-bit 4CPU   - Deep Sjeng WC2008 64-bit 4CPU     28.5 - 6.5     +25/=7/-3     81.43%
Stockfish 1.7.1 64-bit 4CPU   - Komodo 1.0 64-bit                 27.5 - 7.5     +22/=11/-2    78.57%
Stockfish 1.7.1 64-bit 4CPU   - Naum 4.2 64-bit 4CPU              19.5 - 15.5    +9/=21/-5     55.71%
Stockfish 1.7.1 64-bit 4CPU   - Rybka 3 64-bit 4CPU               19.5 - 15.5    +8/=23/-4     55.71%
Stockfish 1.7.1 64-bit 4CPU   - Spark 0.4 64-bit 4CPU             27.0 - 8.0     +20/=14/-1    77.14%
Stockfish 1.7.1 64-bit 4CPU   - Zappa Mexico II 64-bit 4CPU       25.0 - 10.0    +17/=16/-2    71.43%

Download games: 225-280