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 f3d22776f78e5d8f2740a20f567008d7ab8ab5ed..845519bc41648cedd2a7933564d4307b5ceafffa 100644 (file)
--- 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
 
   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
   {
       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;
   {
       mi->evaluationFunction = &EvaluateKKX;
       return mi;