Tweak return value in futility pruning #4897
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In futility pruning, return the average between eval and beta. Passed STC: https://tests.stockfishchess.org/tests/view/65680bb6136acbc5735521d7 LLR: 2.93 (-2.94,2.94) <0.00,2.00> Total: 15200 W: 3926 L: 3642 D: 7632 Ptnml(0-2): 36, 1699, 3867, 1941, 57 Passed LTC: https://tests.stockfishchess.org/tests/view/656817fc136acbc573552304 LLR: 2.94 (-2.94,2.94) <0.50,2.50> Total: 200376 W: 49700 L: 49036 D: 101640 Ptnml(0-2): 110, 22584, 54137, 23246, 111 Bench: 1119702
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In futility pruning, return the average between eval and beta. Passed STC: https://tests.stockfishchess.org/tests/view/65680bb6136acbc5735521d7 LLR: 2.93 (-2.94,2.94) <0.00,2.00> Total: 15200 W: 3926 L: 3642 D: 7632 Ptnml(0-2): 36, 1699, 3867, 1941, 57 Passed LTC: https://tests.stockfishchess.org/tests/view/656817fc136acbc573552304 LLR: 2.94 (-2.94,2.94) <0.50,2.50> Total: 200376 W: 49700 L: 49036 D: 101640 Ptnml(0-2): 110, 22584, 54137, 23246, 111 closes official-stockfish#4897 Bench: 1403703
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In futility pruning, return the average between eval and beta.
Passed STC:
https://tests.stockfishchess.org/tests/view/65680bb6136acbc5735521d7
LLR: 2.93 (-2.94,2.94) <0.00,2.00>
Total: 15200 W: 3926 L: 3642 D: 7632
Ptnml(0-2): 36, 1699, 3867, 1941, 57
Passed LTC:
https://tests.stockfishchess.org/tests/view/656817fc136acbc573552304
LLR: 2.94 (-2.94,2.94) <0.50,2.50>
Total: 200376 W: 49700 L: 49036 D: 101640
Ptnml(0-2): 110, 22584, 54137, 23246, 111
Bench: 1119702