From: Joona Kiiski <joona.kiiski@gmail.com>
Date: Wed, 17 Jun 2009 08:07:16 +0000 (+0300)
Subject: Bugfix: KRK was not classified as KNOWN_WIN
X-Git-Url: https://git.sesse.net/?p=stockfish;a=commitdiff_plain;h=46c0bdb74f104aa8a293c660689f84aae3ca75b3

Bugfix: KRK was not classified as KNOWN_WIN

Problem is that npMaterial is compared to _endgame_ value
of rook, although npMaterial is always (also in endgame!)
calculated using _middlegame_ values.

Bug was hidden as long as Rook middlegame
and endgame values were same.

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

diff --git a/src/material.cpp b/src/material.cpp
index f3d22776..845519bc 100644
--- a/src/material.cpp
+++ b/src/material.cpp
@@ -143,14 +143,14 @@ MaterialInfo* MaterialInfoTable::get_material_info(const Position& pos) {
 
   else if (   pos.non_pawn_material(BLACK) == Value(0)
            && pos.piece_count(BLACK, PAWN) == 0
-           && pos.non_pawn_material(WHITE) >= RookValueEndgame)
+           && pos.non_pawn_material(WHITE) >= RookValueMidgame)
   {
       mi->evaluationFunction = &EvaluateKXK;
       return mi;
   }
   else if (   pos.non_pawn_material(WHITE) == Value(0)
            && pos.piece_count(WHITE, PAWN) == 0
-           && pos.non_pawn_material(BLACK) >= RookValueEndgame)
+           && pos.non_pawn_material(BLACK) >= RookValueMidgame)
   {
       mi->evaluationFunction = &EvaluateKKX;
       return mi;