From: Marco Costalba <mcostalba@gmail.com>
Date: Tue, 9 Sep 2008 05:37:46 +0000 (+0200)
Subject: Use TT in qsearch
X-Git-Url: https://git.sesse.net/?p=stockfish;a=commitdiff_plain;h=a10c9632a5733e1b1aec19950bc3fb541762e36f

Use TT in qsearch

Signed-off-by: Marco Costalba <mcostalba@gmail.com>
---

diff --git a/src/search.cpp b/src/search.cpp
index b750047e..9636ee40 100644
--- a/src/search.cpp
+++ b/src/search.cpp
@@ -1299,6 +1299,11 @@ namespace {
     if (pos.is_draw())
         return VALUE_DRAW;
 
+    // Transposition table lookup
+    const TTEntry* tte = TT.retrieve(pos);
+    if (tte && ok_to_use_TT(tte, depth, beta, ply))
+        return value_from_tt(tte->value(), ply);
+
     // Evaluate the position statically:
     Value staticValue = evaluate(pos, ei, threadID);
 
@@ -1396,6 +1401,9 @@ namespace {
 
     assert(bestValue > -VALUE_INFINITE && bestValue < VALUE_INFINITE);
 
+    // Update transposition table
+    TT.store(pos, value_to_tt(bestValue, ply), depth, MOVE_NONE, VALUE_TYPE_EXACT);
+
     return bestValue;
   }