Chess engine: Stockfish 20061013

Stockfish - UCI chess engine, compiled by Stéphane Nicolet
Rating JCER=3304

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 +2.03
Ptnml(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 +2.54
Ptnml(0-2): 259, 3329, 11286, 3508, 306
https://tests.stockfishchess.org/tests/view/5ee03b06f29b40b0fc95ae0c
Bench: 4757174

Stockfish 20061013 download