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This is a functional simplification that removes the large arrays in endgames.cpp. It also fixes a recently introduced bug (960d59d) in KNBvK, now using flip_file() instead of ~. One fen added to bench to increase endgame coverage. STC LLR: 2.94 (-2.94,2.94) {-1.50,0.50} Total: 174724 W: 33325 L: 33404 D: 107995 Ptnml(0-2): 2503, 19607, 43181, 19608, 2463 http://tests.stockfishchess.org/tests/view/5e6448ffe42a5c3b3ca2e287 LTC LLR: 2.95 (-2.94,2.94) {-1.50,0.50} Total: 35640 W: 4679 L: 4621 D: 26340 Ptnml(0-2): 189, 2991, 11424, 3005, 211 http://tests.stockfishchess.org/tests/view/5e650b24e42a5c3b3ca2e2d8 closes official-stockfish#2577 Bench: 5527957
Simplification. Removes setting statScore to zero if negative.
STC:
LLR: 2.95 (-2.94,2.94) {-1.50,0.50}
Total: 84820 W: 16100 L: 16033 D: 52687
Ptnml(0-2): 1442, 9865, 19723, 9944, 1436
https://tests.stockfishchess.org/tests/view/5e654fdae42a5c3b3ca2e2f8
LTC:
LLR: 2.94 (-2.94,2.94) {-1.50,0.50}
Total: 57658 W: 7435 L: 7391 D: 42832
Ptnml(0-2): 441, 5397, 17104, 5451, 436
https://tests.stockfishchess.org/tests/view/5e657ce9e42a5c3b3ca2e307
closes official-stockfish#2578
Bench: 5168890
somewhat more compact, generates same code. close official-stockfish#2580 No functional change.
only continuation histories seem needed for this purpose. STC: http://tests.stockfishchess.org/tests/view/5e6b88dfe42a5c3b3ca2e4ab LLR: 2.94 (-2.94,2.94) {-1.50,0.50} Total: 113356 W: 21725 L: 21696 D: 69935 Ptnml(0-2): 1999, 13255, 26163, 13240, 2021 LTC: http://tests.stockfishchess.org/tests/view/5e6babbfe42a5c3b3ca2e4c2 LLR: 2.94 (-2.94,2.94) {-1.50,0.50} Total: 22164 W: 2917 L: 2821 D: 16426 Ptnml(0-2): 173, 2040, 6548, 2160, 161 closes official-stockfish#2583 bench: 4839496
closes official-stockfish#2567 No functional change.
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