From: ianfab <ianfab@users.noreply.github.com>
Date: Sat, 28 Jul 2018 13:51:02 +0000 (+0200)
Subject: Skip early pruning in case of mandatory captures
X-Git-Url: http://winboard.nl/cgi-bin?a=commitdiff_plain;h=b2422b1e7b21a1ec2169d6d7be08449b451a82cc;p=fairystockfish.git

Skip early pruning in case of mandatory captures

giveaway STC
LLR: 2.97 (-2.94,2.94) [0.00,10.00]
Total: 86 W: 83 L: 1 D: 2

losers STC
LLR: 2.98 (-2.94,2.94) [0.00,10.00]
Total: 96 W: 89 L: 3 D: 4
---

diff --git a/src/search.cpp b/src/search.cpp
index 8c0a1ef..0820a47 100644
--- a/src/search.cpp
+++ b/src/search.cpp
@@ -734,6 +734,10 @@ namespace {
     improving =   ss->staticEval >= (ss-2)->staticEval
                || (ss-2)->staticEval == VALUE_NONE;
 
+    // Skip early pruning in case of mandatory capture
+    if (pos.must_capture() && MoveList<CAPTURES>(pos).size())
+        goto moves_loop;
+
     // Step 8. Futility pruning: child node (~30 Elo)
     if (   !rootNode
         &&  depth < 7 * ONE_PLY