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CCRL 40/40 Rating List - Custom engine selection
792542 games played by 2037 programs, run by 21 testers
Ponder off, General books (up to 12 moves), 3-4-5 piece EGTB
Time control: Equivalent to 40 moves in 40 minutes on Athlon 64 X2 4600+ (2.4 GHz),
about 15 minutes on a modern Intel CPU.
Computed on February 10, 2018 with Bayeselo based on 792'542 games
Tested by CCRL team, 2005-2018, http://computerchess.org.uk/ccrl/4040/
Engine Elo + - Score AvOp Games
Stockfish 9 64-bit 4CPU 3450 +20 -19 75.5% -181.0 950
Stockfish 8 64-bit 4CPU 3391 +14 -14 65.1% -97.5 1625