Excuses from a crafty fan
1) Number of games is far too low to have any kind of decent conclusion.
2) Newer version played against engines that are slightly stronger.
3) May be the black and white special cases helped in fast time controls.
4) My neighbors wife gained weight which lot of things slower, including crafty.
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49 Crafty 21.6 JA 2653 35 35 299 52% 2641 23%
57 Crafty 22.0 JA 2638 53 54 128 41% 2706 23%
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89 Sloppy 0.2.0 JA 2563 54 54 120 50% 2559 21%
98 Sloppy-0.1.1 JA 2548 49 50 142 48% 2563 23%
I do not have any previous experience with atlanchess. It is a great engine, no crashes, no losses on time, and most of all it can be defeated by a decently strong human.
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383 Atlanchess 4.1 1886 105 112 45 37% 2010 2%