From d6613b758954fac5c8ac16a5352f4a85848a3d6f Mon Sep 17 00:00:00 2001 From: Uri Blass Date: Fri, 26 Sep 2014 02:22:39 +0800 Subject: [PATCH] Change history reduction in LMR to be a full ply. STC: LLR: 2.96 (-2.94,2.94) [-3.00,1.00] Total: 9829 W: 2142 L: 1998 D: 5689 LTC: LLR: 2.95 (-2.94,2.94) [-3.00,1.00] Total: 27162 W: 4802 L: 4692 D: 17668 Bench: 7284120 Resolves #53 --- src/search.cpp | 6 ++---- 1 file changed, 2 insertions(+), 4 deletions(-) diff --git a/src/search.cpp b/src/search.cpp index 945f5bf2..05e3de51 100644 --- a/src/search.cpp +++ b/src/search.cpp @@ -823,12 +823,10 @@ moves_loop: // When in check and at SpNode search starts from here { ss->reduction = reduction(improving, depth, moveCount); - if (!PvNode && cutNode) + if ( (!PvNode && cutNode) + || History[pos.piece_on(to_sq(move))][to_sq(move)] < 0) ss->reduction += ONE_PLY; - else if (History[pos.piece_on(to_sq(move))][to_sq(move)] < 0) - ss->reduction += ONE_PLY / 2; - if (move == countermoves[0] || move == countermoves[1]) ss->reduction = std::max(DEPTH_ZERO, ss->reduction - ONE_PLY); -- 2.39.2