Dev Builds » 20190620-1415

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Commit ID 59f1d0c7dd3fcca307a18ff493ce07e290754a2b
Author Joost VandeVondele
Date 2019-06-20 14:15:57 UTC
Fix progress issue with shuffling extensions Fixes issues #2126 and #2189 where no progress in rootDepth is made for particular fens: 8/8/3P3k/8/1p6/8/1P6/1K3n2 b - - 0 1 8/1r1rp1k1/1b1pPp2/2pP1Pp1/1pP3Pp/pP5P/P5K1/8 w - - 79 46 the cause are the shuffle extensions. Upon closer analysis, it appears that in these cases a shuffle extension is made for every node searched, and progess can not be made. This patch implements a fix, namely to limit the number of extensions relative to the number of nodes searched. The ratio employed is 1/4, which fixes the issues seen so far, but it is a heuristic, and I expect that certain positions might require an even smaller fraction. The patch was tested as a bug fix and passed: STC: LLR: 2.95 (-2.94,2.94) [-3.00,1.00] Total: 56601 W: 12633 L: 12581 D: 31387 LTC: LLR: 2.96 (-2.94,2.94) [-3.00,1.00] Total: 52042 W: 8907 L: 8837 D: 34298 Furthermore, to confirm that the shuffle extension in this form indeed still brings Elo, one more test at VLTC was performed: VLTC: LLR: 2.96 (-2.94,2.94) [0.00,3.50] Total: 142022 W: 20963 L: 20435 D: 100624 Bench: 3961247
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