Author: Roland Pfister
Date: 04:02:57 12/18/97
In the development/debug version of my program Patzer I have built in some statistics about cutoffs. I ran it on the Bratko-Kopec test with search depth 8. Here some results of the cutoff efficiency of move types: BK null hash capt kil1 kil2 misc 2: 67 60 46 31 13 0 3: 79 61 35 45 12 0 4: 87 64 41 38 11 1 5: 76 62 44 25 10 0 6: 74 69 63 30 6 0 7: 78 61 39 36 13 0 8: 72 55 48 45 13 0 9: 79 63 40 24 9 0 10: 80 60 45 34 18 0 11: 75 68 45 28 9 0 12: 72 66 48 40 18 0 that means e.g. in Bratko-Kopec #12 72% of all null moves produced a cutoff, 66% of all hashmoves produced a cutoff etc. the statistics was done in the normal search not quiescense and my move ordering/generation is from left to right ( nullmove first, hash move, good captures, first killer, second killer, up to 5 history moves, rest ). Has anyone else statistics about cutoffs or will produce them?
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