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CuckooChess: Don't use LMP when alpha or beta is a mate score.

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This commit is contained in:
Peter Osterlund
2012-03-04 19:00:09 +00:00
parent 43e0f00175
commit 4f4c1c75e7
5 changed files with 26 additions and 12 deletions
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1
CuckooChessEngine/src/chess/Evaluate.java
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@@ -756,6 +756,7 @@ public class Evaluate {
}
private int threatBonus(Position pos) {
// FIXME!! Try higher weight for attacks on more valuable pieces.
int score = 0;
// Sum values for all black pieces under attack

2
CuckooChessEngine/src/chess/Player.java
View File

@@ -53,7 +53,7 @@ public interface Player {
/**
* Inform player that the transposition table should be cleared.
* Of coarse, a human player has a hard time implementing this.
* Of course, a human player has a hard time implementing this.
*/
public void clearTT();
}

18
CuckooChessEngine/src/chess/Search.java
View File

@@ -734,14 +734,16 @@ public class Search {
boolean givesCheck = MoveGen.givesCheck(pos, m);
boolean doFutility = false;
if (mayReduce && haveLegalMoves && !givesCheck && !passedPawnPush(pos, m)) {
int moveCountLimit;
if (depth <= plyScale) moveCountLimit = 3;
else if (depth <= 2 * plyScale) moveCountLimit = 6;
else if (depth <= 3 * plyScale) moveCountLimit = 12;
else if (depth <= 4 * plyScale) moveCountLimit = 24;
else moveCountLimit = 256;
if (mi >= moveCountLimit)
continue; // Late move pruning
if ((Math.abs(alpha) <= MATE0 / 2) && (Math.abs(beta) <= MATE0 / 2)) {
int moveCountLimit;
if (depth <= plyScale) moveCountLimit = 3;
else if (depth <= 2 * plyScale) moveCountLimit = 6;
else if (depth <= 3 * plyScale) moveCountLimit = 12;
else if (depth <= 4 * plyScale) moveCountLimit = 24;
else moveCountLimit = 256;
if (mi >= moveCountLimit)
continue; // Late move pruning
}
if (futilityPrune)
doFutility = true;
}

2
CuckooChessEngine/src/chess/TextIO.java
View File

@@ -290,7 +290,7 @@ public class TextIO {
ret.append("O-O-O");
}
} else if (move.from == bKingOrigPos && pos.getPiece(bKingOrigPos) == Piece.BKING) {
// Check white castle
// Check black castle
if (move.to == Position.getSquare(6, 7)) {
ret.append("O-O");
} else if (move.to == Position.getSquare(2, 7)) {