 Chess <unk> Grand Tournament ( <unk> ) tests computer chess engines by playing them against each other , with time controls of forty moves in one hundred and twenty minutes per player ( 40 / 120 ) , and also 40 / 20 and 40 / 4 , and uses the results of those games to compile a rating list for each time control . At the slowest time control ( 40 / 120 ) , White has scored 55 @.@ 4 % ( <unk> <unk> <unk> ) in games played among 38 of the strongest chess engines ( as of May 27 , 2009 ) . At 40 / 20 , White has scored 54 @.@ 6 % ( <unk> <unk> <unk> ) in games played among <unk> engines ( as of May 24 , 2009 ) . At the fastest time control ( 40 / 4 ) , White has scored 54 @.@ 8 % ( <unk> <unk> <unk> ) , in games played among 128 programs ( as of May 28 , 2009 ) . 
