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Merged two new endgames from Glaurung 2.2

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It is two bishop against a knight and two minor
pieces against one minor piece.

Signed-off-by: Marco Costalba <mcostalba@gmail.com>
This commit is contained in:
Marco Costalba
2008-12-21 15:38:10 +01:00
parent 72ca727b38
commit f178f0a291
3 changed files with 87 additions and 0 deletions
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18
src/material.cpp
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@@ -161,6 +161,22 @@ MaterialInfo* MaterialInfoTable::get_material_info(const Position& pos) {
mi->evaluationFunction = &EvaluateKKX;
return mi;
}
else if ( pos.pawns() == EmptyBoardBB
&& pos.rooks() == EmptyBoardBB
&& pos.queens() == EmptyBoardBB)
{
// Minor piece endgame with at least one minor piece per side,
// and no pawns.
assert(pos.knights(WHITE) | pos.bishops(WHITE));
assert(pos.knights(BLACK) | pos.bishops(BLACK));
if ( pos.piece_count(WHITE, BISHOP) + pos.piece_count(WHITE, KNIGHT) <= 2
&& pos.piece_count(BLACK, BISHOP) + pos.piece_count(BLACK, KNIGHT) <= 2)
{
mi->evaluationFunction = &EvaluateKmmKm;
return mi;
}
}
// OK, we didn't find any special evaluation function for the current
// material configuration. Is there a suitable scaling function?
@@ -309,6 +325,8 @@ EndgameFunctions::EndgameFunctions() {
add(z[W][KNIGHT][1] ^ z[B][ROOK][1], &EvaluateKNKR);
add(z[W][QUEEN][1] ^ z[B][ROOK][1], &EvaluateKQKR);
add(z[W][ROOK][1] ^ z[B][QUEEN][1], &EvaluateKRKQ);
add(z[W][BISHOP][2] ^ z[B][KNIGHT][1], &EvaluateKBBKN);
add(z[W][KNIGHT][1] ^ z[B][BISHOP][2], &EvaluateKNKBB);
add(z[W][KNIGHT][1] ^ z[W][PAWN][1], W, &ScaleKNPK);
add(z[B][KNIGHT][1] ^ z[B][PAWN][1], B, &ScaleKKNP);