From: pb00067 <pb00067@PHXL0356.wp.lan>
Date: Fri, 13 Mar 2020 18:29:36 +0000 (+0100)
Subject: Simplify futility pruning parent node
X-Git-Url: https://git.sesse.net/?p=stockfish;a=commitdiff_plain;h=ec2002c594cce22dfbbdc7b6b8df2828a00d18cf;hp=ec2002c594cce22dfbbdc7b6b8df2828a00d18cf

Simplify futility pruning parent node

only continuation histories seem needed for this purpose.

STC:
http://tests.stockfishchess.org/tests/view/5e6b88dfe42a5c3b3ca2e4ab
LLR: 2.94 (-2.94,2.94) {-1.50,0.50}
Total: 113356 W: 21725 L: 21696 D: 69935
Ptnml(0-2): 1999, 13255, 26163, 13240, 2021

LTC:
http://tests.stockfishchess.org/tests/view/5e6babbfe42a5c3b3ca2e4c2
LLR: 2.94 (-2.94,2.94) {-1.50,0.50}
Total: 22164 W: 2917 L: 2821 D: 16426
Ptnml(0-2): 173, 2040, 6548, 2160, 161

closes https://github.com/official-stockfish/Stockfish/pull/2583

bench: 4839496
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