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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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15
CuckooChessEngine/test/chess/SearchTest.java
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@@ -204,7 +204,18 @@ public class SearchTest {
Move bestM = idSearch(sc, 28);
assertEquals(TextIO.stringToMove(pos, "Kb1"), new Move(bestM));
}
/**
* Late move pruning must not be used in mate search.
*/
@Test
public void testLMP() throws ChessParseError {
Position pos = TextIO.readFEN("2r2rk1/6p1/p3pq1p/1p1b1p2/3P1n2/PP3N2/3N1PPP/1Q2RR1K b"); // WAC 174
Search sc = new Search(pos, nullHist, 0, tt);
Move bestM = idSearch(sc, 2);
assertTrue(bestM.score < Search.MATE0 / 2);
}
@Test
public void testCheckEvasion() throws ChessParseError {
System.out.println("check evasion");
@@ -234,7 +245,7 @@ public class SearchTest {
System.out.println("kqkrNullMove");
Position pos = TextIO.readFEN("7K/6R1/5k2/3q4/8/8/8/8 b - - 0 1");
Search sc = new Search(pos, nullHist, 0, tt);
Move bestM = idSearch(sc, 9);
Move bestM = idSearch(sc, 10);
assertEquals(Search.MATE0-18, bestM.score);
}