From 738c5595adefe397d8389fb315908e7d2f6ab40c Mon Sep 17 00:00:00 2001 From: Uri Blass Date: Tue, 10 Sep 2013 08:37:23 +0200 Subject: [PATCH] Extend checks more in losing positions Passed both short TC: LLR: 2.98 (-2.94,2.94) [-1.50,4.50] Total: 3974 W: 860 L: 741 D: 2373 And long TC: LLR: 2.96 (-2.94,2.94) [0.00,6.00] Total: 16807 W: 2917 L: 2733 D: 11157 bench: 3767999 --- src/search.cpp | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/src/search.cpp b/src/search.cpp index 4b0a9fe8..f64f55f0 100644 --- a/src/search.cpp +++ b/src/search.cpp @@ -837,7 +837,7 @@ moves_loop: // When in check and at SpNode search starts from here ext = ONE_PLY; else if (givesCheck && pos.see_sign(move) >= 0) - ext = ONE_PLY / 2; + ext = inCheck || ss->staticEval < VALUE_ZERO ? ONE_PLY : ONE_PLY / 2; // Singular extension search. If all moves but one fail low on a search of // (alpha-s, beta-s), and just one fails high on (alpha, beta), then that move -- 2.39.2