From: Marco Costalba <mcostalba@gmail.com>
Date: Sat, 19 Sep 2009 16:34:42 +0000 (+0200)
Subject: Evaluation drift: add always 7 instead of ply
X-Git-Url: https://git.sesse.net/?p=stockfish;a=commitdiff_plain;h=24cc3a97a480afdd5587ab9b2d75c1426acc3133;hp=e4277c06bfb783b5ec78001eeef06fa9feae033f

Evaluation drift: add always 7 instead of ply

After 828 games at 1+0

Mod vs Orig +191 =447 -190 50.06%  414.5/828

So almost no difference. Patch is committed more for
documentation purposes then for other reasons.

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

diff --git a/src/search.cpp b/src/search.cpp
index 41f679a2..06cc9b60 100644
--- a/src/search.cpp
+++ b/src/search.cpp
@@ -1540,10 +1540,10 @@ namespace {
         // Use the cached evaluation score if possible
         assert(ei.futilityMargin == Value(0));
 
-        staticValue = tte->value() + ply;
+        staticValue = tte->value() + 7;
     }
     else
-        staticValue = evaluate(pos, ei, threadID) + ply;
+        staticValue = evaluate(pos, ei, threadID) + 7;
 
     if (ply == PLY_MAX - 1)
         return evaluate(pos, ei, threadID);