From: Jean-Francois Romang <jeanfrancois.romang@gmail.com>
Date: Thu, 25 Oct 2012 06:54:05 +0000 (+0000)
Subject: Enable true 3 fold detection in search
X-Git-Url: https://git.sesse.net/?p=stockfish;a=commitdiff_plain;h=5436d98fc54600ead011304274250e8b5de35c6a;ds=inline

Enable true 3 fold detection in search
---

diff --git a/src/search.cpp b/src/search.cpp
index 54523631..785cf0ef 100644
--- a/src/search.cpp
+++ b/src/search.cpp
@@ -524,7 +524,7 @@ namespace {
     if (!RootNode)
     {
         // Step 2. Check for aborted search and immediate draw
-        if (Signals.stop || pos.is_draw<false,true>() || ss->ply > MAX_PLY)
+        if (Signals.stop || (PvNode?pos.is_draw<false,false>():pos.is_draw<false,true>()) || ss->ply > MAX_PLY)
             return DrawValue[pos.side_to_move()];
 
         // Step 3. Mate distance pruning. Even if we mate at the next move our score