From: Joona Kiiski <joona.kiiski@gmail.com>
Date: Tue, 8 Dec 2009 17:06:38 +0000 (+0200)
Subject: Disable insert_pv
X-Git-Url: https://git.sesse.net/?p=stockfish;a=commitdiff_plain;h=d0b8bc5fdfae9efe75b9828ac72340f13718ebb4

Disable insert_pv

This way we avoid overwriting valuable TT entries which
are needed to calculate exclusion search extension for pv.

Mod - Orig: 483 - 410 (+28 elo!)

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

diff --git a/src/search.cpp b/src/search.cpp
index 96a945e6..7bacb89c 100644
--- a/src/search.cpp
+++ b/src/search.cpp
@@ -743,7 +743,7 @@ namespace {
 
         // Write PV to transposition table, in case the relevant entries have
         // been overwritten during the search.
-        TT.insert_pv(p, ss[0].pv);
+        //TT.insert_pv(p, ss[0].pv);
 
         if (AbortSearch)
             break; // Value cannot be trusted. Break out immediately!