From: Marco Costalba <mcostalba@gmail.com>
Date: Tue, 16 Dec 2014 07:25:54 +0000 (+0100)
Subject: Don't account for Tempo in specialized endgames
X-Git-Url: https://git.sesse.net/?p=stockfish;a=commitdiff_plain;h=9cae6e66ce00850086d1bfe1e24e34442c12b206

Don't account for Tempo in specialized endgames

The evaluation is already done by the specialized
function, don't need to add something elese later.

With this patch following positions are evaluated
correctly as draws:

8/6p1/1Pkp1p1p/2nNn2P/2P1K1P1/8/8/3B4 w - - 7
8/1k4p1/1P1p1p1p/3NnK1P/2P3P1/1n6/4B3/8 w - -

Verified it not regress with an STC test:
LLR: 3.15 (-2.94,2.94) [-3.00,1.00]
Total: 49812 W: 10095 L: 10016 D: 29701

Reported by Arjun Temurnikar.

bench: 8289983
---

diff --git a/src/evaluate.cpp b/src/evaluate.cpp
index b7a596ef..38f2d604 100644
--- a/src/evaluate.cpp
+++ b/src/evaluate.cpp
@@ -702,7 +702,7 @@ namespace {
     // If we have a specialized evaluation function for the current material
     // configuration, call it and return.
     if (ei.mi->specialized_eval_exists())
-        return ei.mi->evaluate(pos) + Eval::Tempo;
+        return ei.mi->evaluate(pos);
 
     // Probe the pawn hash table
     ei.pi = Pawns::probe(pos, thisThread->pawnsTable);