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This patch allows stats updates and movepicker bonuses for continuation history 3 plies deep - so counter counter move. Updates and movepicker usage are done with 1/4 multiplier compared to other histories. Passed STC: https://tests.stockfishchess.org/tests/view/6528f28d3125598fc7ebb5a3 LLR: 2.96 (-2.94,2.94) <0.00,2.00> Total: 161344 W: 41369 L: 40868 D: 79107 Ptnml(0-2): 535, 18720, 41679, 19185, 553 Passed LTC: https://tests.stockfishchess.org/tests/view/652a397a3125598fc7ebd1d6 LLR: 2.95 (-2.94,2.94) <0.50,2.50> Total: 48564 W: 12556 L: 12215 D: 23793 Ptnml(0-2): 25, 5149, 13595, 5486, 27 closes official-stockfish#4827 bench 1327410
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