From: Marco Costalba <mcostalba@gmail.com>
Date: Mon, 3 Mar 2014 07:39:34 +0000 (+0100)
Subject: Revert dynamic draw value
X-Git-Url: https://git.sesse.net/?p=stockfish;a=commitdiff_plain;h=bbd69c0260a12cedf2b4d32b9ec3d478270533ce;hp=708cb311a040ca8c676524025c9d72ed4c632267

Revert dynamic draw value

When tested with weaker engines did not
performed as expected, actually it was even
a regression from standard version.

bench: 8430785
---

diff --git a/src/search.cpp b/src/search.cpp
index eb3fc82a..72ec79e7 100644
--- a/src/search.cpp
+++ b/src/search.cpp
@@ -185,8 +185,7 @@ void Search::think() {
   RootColor = RootPos.side_to_move();
   TimeMgr.init(Limits, RootPos.game_ply(), RootColor);
 
-  // Dynamic draw value: try to avoid repetition draws at early midgame
-  int cf = std::max(70 - RootPos.game_ply(), 0);
+  int cf = Options["Contempt Factor"] * PawnValueMg / 100; // From centipawns
   DrawValue[ RootColor] = VALUE_DRAW - Value(cf);
   DrawValue[~RootColor] = VALUE_DRAW + Value(cf);