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DroidFish: Workaround for GTB en passant probing bug.

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This commit is contained in:
Peter Osterlund 2014-07-03 09:22:16 +00:00
parent 47f1cc4ac9
commit c3acf44ac8
2 changed files with 34 additions and 1 deletions
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2
DroidFish/src/org/petero/droidfish/gamelogic/MoveGen.java
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@ -26,7 +26,7 @@ import java.util.ArrayList;
* @author petero
*/
public class MoveGen {
static MoveGen instance;
public static MoveGen instance;
static {
instance = new MoveGen();
}

33
DroidFish/src/org/petero/droidfish/gtb/Probe.java
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@ -72,6 +72,39 @@ public class Probe {
* @return True if success.
*/
public final ProbeResult probeHard(Position pos) {
ProbeResult ret = probeHardRaw(pos);
if (ret.result == ProbeResult.DRAW && pos.getEpSquare() != -1) {
ArrayList<Move> moveList = MoveGen.instance.legalMoves(pos);
int pawn = pos.whiteMove ? Piece.WPAWN : Piece.BPAWN;
int maxMate = -1;
UndoInfo ui = new UndoInfo();
for (Move move : moveList) {
if ((move.to != pos.getEpSquare()) || (pos.getPiece(move.from) != pawn))
return ret;
pos.makeMove(move, ui);
ProbeResult ret2 = probeHard(pos);
pos.unMakeMove(move, ui);
switch (ret2.result) {
case ProbeResult.DRAW:
break;
case ProbeResult.WMATE:
case ProbeResult.BMATE:
maxMate = Math.max(maxMate, ret2.movesToMate);
break;
case ProbeResult.UNKNOWN:
ret.result = ProbeResult.UNKNOWN;
return ret;
}
}
if (maxMate != -1) {
ret.result = pos.whiteMove ? ProbeResult.BMATE : ProbeResult.WMATE;
ret.movesToMate = maxMate;
}
}
return ret;
}
private final ProbeResult probeHardRaw(Position pos) {
int castleMask = 0;
if (pos.a1Castle()) castleMask |= GtbProbe.A1_CASTLE;
if (pos.h1Castle()) castleMask |= GtbProbe.H1_CASTLE;