Rybka 4 64-bit 1CPU Gauntlets (CCRL 40/40)

[Aser Huerga]

Rybka 4 64-bit 1CPU Gauntlets

Hardware: Intel(R) Core(TM)2 Duo CPU E8400 @ 3.00GHzDual 3000 MHz with 4.088 MB Memory
Operating system: Microsoft Windows XP 64 Bit Professional Service Pack 2 (Build 3790)
All engines 1 CPU
Arena 2.0.1 GUI
128 Hash Tables
3-4-5 EGTBs
Ponder off
Book GrandPQRS PGN up to 8 moves (151.315 starting positions from years 1981-2009, games selected by Norm Pollock), each pair plays the same position with switched colours.
40 moves in 25 minutes repeating (adapted to the CCRL 40/40 standard)

Gauntlet I:

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1   Rybka 4 64-bit            -3213- 82.5/120
2   Rybka 3 64-bit             3152  13.0/24
3   Stockfish 1.7.1 64-bit     3133  9.0/24
4   Naum 4.2 64-bit            3101  7.5/24
5   Shredder 12 32-bit OA Off  3030  5.0/24
6   Thinker 5.4C Inert 64-bit  2972  3.0/24

(All ELOs referred to the last Chess Computer Rating List when tournament starts, except -XXXX- one, wich is referred to performance).

Statistics:

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Rybka 4 64-bit                : 120 (+ 55,= 55,- 10), 68.8 %

Rybka 3 64-bit                :  24 (+  3,= 16,-  5), 45.8 %
Stockfish 1.7.1 64-bit        :  24 (+ 10,= 10,-  4), 62.5 %
Naum 4.2 64-bit               :  24 (+ 10,= 13,-  1), 68.8 %
Shredder 12 32-bit OA Off     :  24 (+ 14,= 10,-  0), 79.2 %
Thinker 5.4C Inert 64-bit     :  24 (+ 18,=  6,-  0), 87.5 %

Games: http://kirill-kryukov.com/chess/discuss ... f=7&t=5176

Only Rybka 3 outperformed Rybka 4

[Aser Huerga]

Gauntlet II:

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1   Rybka 4 64-bit         -3192- 70.0/96
2   Zappa Mexico II 64-bit  2965  7.5/24
3   Komodo 1.0 64-bit       3031  6.5/24
4   Stockfish 1.6.3 64-bit  3074  6.0/24  420.00
5   Rybka 2.2n2 64-bit      3016  6.0/24  420.00

(All ELOs referred to the last Chess Computer Rating List when tournament starts, except -XXXX- one, wich is referred to performance).

Statistics:

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Rybka 4 64-bit                :  96 (+ 49,= 42,-  5), 72.9 %

Stockfish 1.6.3 64-bit        :  24 (+ 15,=  6,-  3), 75.0 %
Komodo 1.0 64-bit             :  24 (+ 12,= 11,-  1), 72.9 %
Rybka 2.2n2 64-bit            :  24 (+ 13,= 10,-  1), 75.0 %
Zappa Mexico II 64-bit        :  24 (+  9,= 15,-  0), 68.8 %

Games: http://kirill-kryukov.com/chess/discuss ... 581#p54581

[Aser Huerga]

Rybka keeps position 1 with the 4 64-bit version (now 3176 in CCRL 40/40 1CPU), showing an improvement of 23 ELO points regarding the 3 64-bit version , 46 ELO points ahead Stockfish.
http://computerchess.org.uk/ccrl/4040.l ... ons_only=1