From: Fabian Fichter <ianfab@users.noreply.github.com>
Date: Mon, 8 Feb 2021 21:35:16 +0000 (+0100)
Subject: Simplify shallow depth pruning for anti variants
X-Git-Url: http://winboard.nl/cgi-bin?a=commitdiff_plain;h=610e2924bc3c27cc104dc02ad6059ff54f9d1e5c;p=fairystockfish.git

Simplify shallow depth pruning for anti variants

giveaway STC
LLR: 2.96 (-2.94,2.94) [-10.00,5.00]
Total: 1787 W: 698 L: 655 D: 434
http://www.variantfishtest.org:6543/tests/view/601e7a7a6e23db669974e823

giveaway LTC
LLR: 2.96 (-2.94,2.94) [-10.00,5.00]
Total: 1501 W: 550 L: 507 D: 444
http://www.variantfishtest.org:6543/tests/view/601ecee96e23db669974e834

losers STC
LLR: 2.99 (-2.94,2.94) [-10.00,5.00]
Total: 14506 W: 6366 L: 6407 D: 1733
http://www.variantfishtest.org:6543/tests/view/601e7a8f6e23db669974e827

losers LTC
LLR: 2.96 (-2.94,2.94) [-10.00,5.00]
Total: 3939 W: 1740 L: 1707 D: 492
http://www.variantfishtest.org:6543/tests/view/601fbb036e23db669974e846
---

diff --git a/src/search.cpp b/src/search.cpp
index 5b581ef..7eb4252 100644
--- a/src/search.cpp
+++ b/src/search.cpp
@@ -1120,7 +1120,7 @@ moves_loop: // When in check, search starts from here
           // Reduced depth of the next LMR search
           int lmrDepth = std::max(newDepth - reduction(improving, depth, moveCount), 0);
 
-          if (pos.must_capture() && (captureOrPromotion || givesCheck || pos.attackers_to(to_sq(move), ~us)))
+          if (pos.must_capture() && pos.attackers_to(to_sq(move), ~us))
           {}
           else