From: Fabian Fichter <ianfab@users.noreply.github.com>
Date: Sat, 22 Sep 2018 12:01:17 +0000 (+0200)
Subject: Skip SEE pruning of captures for antichess variants
X-Git-Url: http://winboard.nl/cgi-bin?a=commitdiff_plain;h=9479a8115bbd1d27dd5ce96656db5edf27575553;p=fairystockfish.git

Skip SEE pruning of captures for antichess variants

STC giveaway
LLR: 2.97 (-2.94,2.94) [0.00,10.00]
Total: 291 W: 147 L: 64 D: 80
http://35.161.250.236:6543/tests/view/5ba630ff6e23db0fbab0ddc1

STC losers
LLR: 2.97 (-2.94,2.94) [0.00,10.00]
Total: 661 W: 331 L: 232 D: 98
http://35.161.250.236:6543/tests/view/5ba631176e23db0fbab0ddc4
---

diff --git a/src/search.cpp b/src/search.cpp
index cb09d15..7b4bf8b 100644
--- a/src/search.cpp
+++ b/src/search.cpp
@@ -970,6 +970,7 @@ moves_loop: // When in check, search starts from here
                   continue;
           }
           else if (   !extension // (~20 Elo)
+                   && !pos.must_capture()
                    && !pos.see_ge(move, -Value(PawnValueEg * (depth / ONE_PLY))))
                   continue;
       }