From: Jean-Francois Romang <jeanfrancois.romang@gmail.com>
Date: Thu, 25 Oct 2012 13:57:44 +0000 (+0200)
Subject: Full three fold repetition detection only at root node
X-Git-Url: https://git.sesse.net/?p=stockfish;a=commitdiff_plain;h=77c91ac1ba45c55584de81b58116361564c6a69a

Full three fold repetition detection only at root node
---

diff --git a/src/search.cpp b/src/search.cpp
index 785cf0ef..9980dcf9 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 || (PvNode?pos.is_draw<false,false>():pos.is_draw<false,true>()) || ss->ply > MAX_PLY)
+        if (Signals.stop || 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
@@ -538,6 +538,10 @@ namespace {
         if (alpha >= beta)
             return alpha;
     }
+	else 
+	{
+		if(pos.is_draw<false,false>()) return DrawValue[pos.side_to_move()];
+	}
 
     // Step 4. Transposition table lookup
     // We don't want the score of a partial search to overwrite a previous full search