From 573241e9cb9e0eb309b5ee40bccf043c07c5734c Mon Sep 17 00:00:00 2001 From: Fabian Fichter Date: Mon, 1 Feb 2021 18:57:28 +0100 Subject: [PATCH] Tweak futility pruning for racing kings racingkings STC LLR: 2.96 (-2.94,2.94) [0.00,10.00] Total: 1610 W: 544 L: 450 D: 616 http://www.variantfishtest.org:6543/tests/view/6016cb9b6e23db669974e6ce racingkings LTC LLR: 2.96 (-2.94,2.94) [0.00,10.00] Total: 3787 W: 1113 L: 998 D: 1676 http://www.variantfishtest.org:6543/tests/view/6016d1186e23db669974e6d4 --- src/search.cpp | 3 +-- 1 files changed, 1 insertions(+), 2 deletions(-) diff --git a/src/search.cpp b/src/search.cpp index 50c490b..8b67407 100644 --- a/src/search.cpp +++ b/src/search.cpp @@ -910,8 +910,7 @@ namespace { // Step 7. Futility pruning: child node (~50 Elo) if ( !PvNode && depth < 9 - && !(pos.capture_the_flag_piece() && !pos.checking_permitted()) - && eval - futility_margin(depth, improving) * (1 + pos.check_counting() + 2 * pos.must_capture() + pos.extinction_single_piece()) >= beta + && eval - futility_margin(depth, improving) * (1 + pos.check_counting() + 2 * pos.must_capture() + pos.extinction_single_piece() + !pos.checking_permitted()) >= beta && eval < VALUE_KNOWN_WIN) // Do not return unproven wins return eval; -- 1.7.0.4