From 77c91ac1ba45c55584de81b58116361564c6a69a Mon Sep 17 00:00:00 2001
From: Jean-Francois Romang <jeanfrancois.romang@gmail.com>
Date: Thu, 25 Oct 2012 15:57:44 +0200
Subject: [PATCH] Full three fold repetition detection only at root node

---
 src/search.cpp | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

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
-- 
2.39.2