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There is no need to special case KNNK ending

Browse source 
It is always draw, so use the corresponding proper
evaluation function.

No functional change.

Signed-off-by: Marco Costalba <mcostalba@gmail.com>
This commit is contained in:
Marco Costalba 2009-08-08 12:28:03 +01:00
parent 23ceb66950
commit aa925a0e29
3 changed files with 9 additions and 13 deletions
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7
src/endgame.cpp
View file

@ -348,11 +348,18 @@ Value EvaluationFunction<KBBKN>::apply(const Position& pos) {
return (strongerSide == pos.side_to_move() ? result : -result);
}
/// K and two minors vs K and one or two minors or K and two knights against
/// king alone are always draw.
template<>
Value EvaluationFunction<KmmKm>::apply(const Position&) {
return Value(0);
}
template<>
Value EvaluationFunction<KNNK>::apply(const Position&) {
return Value(0);
}
/// KBPKScalingFunction scales endgames where the stronger side has king,
/// bishop and one or more pawns. It checks for draws with rook pawns and a

1
src/endgame.h
View file

@ -45,6 +45,7 @@ enum EndgameType {
KRKN, // KR vs KN
KQKR, // KQ vs KR
KBBKN, // KBB vs KN
KNNK, // KNN vs K
KmmKm, // K and two minors vs K and one or two minors
// Scaling functions

14
src/material.cpp
View file

@ -61,8 +61,6 @@ namespace {
ScalingFunction<KQKRP> ScaleKQKRP(WHITE), ScaleKRPKQ(BLACK);
ScalingFunction<KPsK> ScaleKPsK(WHITE), ScaleKKPs(BLACK);
ScalingFunction<KPKP> ScaleKPKPw(WHITE), ScaleKPKPb(BLACK);
Key KNNKMaterialKey, KKNNMaterialKey;
}
@ -157,14 +155,6 @@ MaterialInfo* MaterialInfoTable::get_material_info(const Position& pos) {
mi->clear();
mi->key = key;
// A special case before looking for a specialized evaluation function
// KNN vs K is a draw.
if (key == KNNKMaterialKey || key == KKNNMaterialKey)
{
mi->factor[WHITE] = mi->factor[BLACK] = 0;
return mi;
}
// Let's look if we have a specialized evaluation function for this
// particular material configuration. First we look for a fixed
// configuration one, then a generic one if previous search failed.
@ -348,9 +338,7 @@ MaterialInfo* MaterialInfoTable::get_material_info(const Position& pos) {
EndgameFunctions::EndgameFunctions() {
KNNKMaterialKey = buildKey("KNNK");
KKNNMaterialKey = buildKey("KKNN");
add<EvaluationFunction<KNNK> >("KNNK");
add<EvaluationFunction<KPK> >("KPK");
add<EvaluationFunction<KBNK> >("KBNK");
add<EvaluationFunction<KRKP> >("KRKP");