!! latest version !!Windows x64 for Haswell CPUsWindows x64 for modern computersWindows x64Windows 32Linux x64 for Haswell CPUsLinux x64 for modern computersLinux x64Author: Stéphane Nicolet
Date: Wed Jun 10 13:07:12 2020 +0200
Timestamp: 1591787232
Improve the anti-shuffling policy
We replace the current decrease of the complexity term in initiative
when shuffling by a direct damping of the evaluation. This scheme may
have two benefits over the initiative approach:
a) the damping effect is more brutal for fortresses with heavy pieces
on the board, because the initiative term is almost an endgame term;
b) the initiative implementation had a funny side effect, almost a bug,
in the rare positions where mg > 0, eg < 0 and the tampered eval
returned a positive value (ie with heavy pieces still on the board):
sending eg to zero via shuffling would **increase** the tampered
eval instead of decreasing it, which is somewhat illogical. This
patch avoids this phenomenon.
STC:
LLR: 2.94 (-2.94,2.94) {-0.50,1.50}
Total: 43072 W: 8373 L: 8121 D: 26578
Elo +2.03Ptnml(0-2): 729, 4954, 9940, 5162, 751
https://tests.stockfishchess.org/tests/view/5ee008ebf29b40b0fc95ade2 LTC:
LLR: 2.94 (-2.94,2.94) {0.25,1.75}
Total: 37376 W: 4816 L: 4543 D: 28017
Elo +2.54Ptnml(0-2): 259, 3329, 11286, 3508, 306
https://tests.stockfishchess.org/tests/view/5ee03b06f29b40b0fc95ae0c Closes
https://github.com/official-stockfish/Stockfish/pull/2727 Bench: 4757174