diff options
Diffstat (limited to 'src')
| -rw-r--r-- | src/grossmeister/search.rs | 15 |
1 files changed, 10 insertions, 5 deletions
diff --git a/src/grossmeister/search.rs b/src/grossmeister/search.rs index 43423e4..532e9ed 100644 --- a/src/grossmeister/search.rs +++ b/src/grossmeister/search.rs @@ -22,6 +22,11 @@ impl Grossmeister { let mut killer_moves = Vec::new(); let color = self.board.color(); + if self.board.positions.iter().filter(|p| **p == self.board.hash).count() >= 3 { + // Draw by repetition + return (0.0, principal_variation); + } + if let Some(transposition) = self.transposition() { if transposition.depth == depth_left { match transposition.node_type { @@ -45,11 +50,6 @@ impl Grossmeister { } } - if self.board.positions.iter().filter(|p| **p == self.board.hash).count() >= 3 { - // Draw by repetition - return (0.0, principal_variation); - } - if depth_left == 0 { return (self.quiscence(alpha, beta), principal_variation); } @@ -154,6 +154,11 @@ impl Grossmeister { let mut moves = self.board.generate_pseudolegal_moves(); moves = self.order_moves(moves, Vec::new()); + if self.board.positions.iter().filter(|p| **p == self.board.hash).count() >= 3 { + // Draw by repetition + return 0.0; + } + if !self.board.is_king_in_check(color) { // If we are not in check, we can evaluate stand pat let stand_pat = self.evaluate(); |