Dev Builds » 20180401-0019

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Commit ID d9cac9a41492c3e54f3bb471606ec3a922a8ea0f
Author Stéphane Nicolet
Date 2018-04-01 00:19:42 UTC
Simplify KBPKB endgame with opposite bishops When we reach a position with only two opposite colored bishops and one pawn on the board, current master would give it a scale factor of 9/64=0.14 in about one position out of 7200, and a scale factor of 0.0 in the 7199 others. The patch gives a scale factor of 0.0 in 100% of the cases. STC: LLR: 2.96 (-2.94,2.94) [-3.00,1.00] Total: 55845 W: 11467 L: 11410 D: 32968 LTC: LLR: 2.95 (-2.94,2.94) [-3.00,1.00] Total: 11915 W: 1852 L: 1719 D: 8344 We also have exhaustive coverage analysis of this patch effect by Alain Savard, comparing the perfect evaluation given by the Syzygy tablebase with the heuristic play after this patch for the set of all legal positions of the KBPKP endgame with opposite bishops, in the comments thread for this pull request: Alain's conclusion: > According to this definition and the data, I consider this PR is > identical to master to "solve for draw" and slightly better than > master to solve earlier for "wins". Note: this patch is a side effect of an ongoing effort to improve the evaluation of positions involving a pair of opposite bishops. See the GitHub diff of this LTC test which almost passed at sprt[0..5] for a discussion: No functional change (at small bench depths)
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