Adjustment of the aspiration window after fail high/low. #6292
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For the new bound in the opposite direction of the fail, use a weighted average of alpha, beta and best value +- delta. In the case of a fail high, different average weights are used depending on whether or not there was a best move change during the last search. The weights are determined from the following two consecutive LTC tunings. First tuning: https://tests.stockfishchess.org/tests/view/68ab727975da51a345a5ac2e Second tuning: https://tests.stockfishchess.org/tests/view/68aba3fe75da51a345a5ad52 Passed LTC: LLR: 2.94 (-2.94,2.94) <0.00,2.00> Total: 39504 W: 10243 L: 9947 D: 19314 Ptnml(0-2): 25, 4182, 11041, 4480, 24 https://tests.stockfishchess.org/tests/view/68acbb6d6217b8721dca95f8 Passed VLTC: LLR: 2.95 (-2.94,2.94) <0.50,2.50> Total: 91196 W: 23574 L: 23167 D: 44455 Ptnml(0-2): 13, 8943, 27276, 9356, 10 https://tests.stockfishchess.org/tests/view/68af64786217b8721dca993d Bench: 2776937
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For the new bound in the opposite direction of the fail, use a weighted average of alpha, beta and best value +- delta. In the case of a fail high, different average weights are used depending on whether or not there was a best move change during the last search.
The weights are determined from the following two consecutive LTC tunings.
First tuning: https://tests.stockfishchess.org/tests/view/68ab727975da51a345a5ac2e
Second tuning: https://tests.stockfishchess.org/tests/view/68aba3fe75da51a345a5ad52
Passed LTC:
LLR: 2.94 (-2.94,2.94) <0.00,2.00>
Total: 39504 W: 10243 L: 9947 D: 19314
Ptnml(0-2): 25, 4182, 11041, 4480, 24
https://tests.stockfishchess.org/tests/view/68acbb6d6217b8721dca95f8
Passed VLTC:
LLR: 2.95 (-2.94,2.94) <0.50,2.50>
Total: 91196 W: 23574 L: 23167 D: 44455
Ptnml(0-2): 13, 8943, 27276, 9356, 10
https://tests.stockfishchess.org/tests/view/68af64786217b8721dca993d
Bench: 2776937