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Better value clipping in game_phase()

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No functional change.
This commit is contained in:
Marco Costalba
2014-06-21 00:02:43 +02:00
parent 3b315c9ada
commit 43efd7fad7
1 changed files with 5 additions and 4 deletions
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9
src/position.cpp
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@@ -465,15 +465,16 @@ const string Position::pretty(Move m) const {
}
/// Position::game_phase() calculates the game phase of the position
/// Position::game_phase() calculates the game phase interpolating total non-pawn
/// material between endgame and midgame limits.
Phase Position::game_phase() const {
Value npm = st->npMaterial[WHITE] + st->npMaterial[BLACK];
return npm >= MidgameLimit ? PHASE_MIDGAME
: npm <= EndgameLimit ? PHASE_ENDGAME
: Phase(((npm - EndgameLimit) * 128) / (MidgameLimit - EndgameLimit));
npm = std::max(EndgameLimit, std::min(npm, MidgameLimit));
return Phase(((npm - EndgameLimit) * 128) / (MidgameLimit - EndgameLimit));
}