diff options
Diffstat (limited to 'src/grossmeister/search.rs')
| -rw-r--r-- | src/grossmeister/search.rs | 15 |
1 files changed, 7 insertions, 8 deletions
diff --git a/src/grossmeister/search.rs b/src/grossmeister/search.rs index bf080eb..2491d1f 100644 --- a/src/grossmeister/search.rs +++ b/src/grossmeister/search.rs @@ -87,7 +87,7 @@ impl Grossmeister { return self.quiscence(alpha, beta, root_distance) } - let mut should_pv_search = true; + let mut full_window_search = true; let mut legal_move_found = false; self.cleanup_selector(); @@ -100,22 +100,21 @@ impl Grossmeister { if !self.board.is_king_in_check(color) { legal_move_found = true; - let mut score = if should_pv_search { + let score = if full_window_search { // Assume PV-node is high in the list (if move ordering is good) - self.negamax_search(-beta, -alpha, depth_left - 1, root_distance + 1) + -self.negamax_search(-beta, -alpha, depth_left - 1, root_distance + 1) } else { // After we have PV-node (that raised alpha) all other nodes will be searched // with zero-window first to confirm this assumption - let score = self.negamax_search(-(alpha + 0.001), -alpha, depth_left - 1, root_distance + 1); + let score = -self.negamax_search(-(alpha + 0.01), -alpha, depth_left - 1, root_distance + 1); // In case some of the other nodes raises alpha, then it's true PV node now, // let's research with full window to find its exact value - if -score > alpha { - self.negamax_search(-beta, -alpha, depth_left - 1, root_distance + 1) + if score > alpha { + -self.negamax_search(-beta, -alpha, depth_left - 1, root_distance + 1) } else { score } }; - score *= -1.; self.board.unmake_move(mov, captured_piece, ep_target_before, castling_rights_before, hash_before); if score >= beta { @@ -132,7 +131,7 @@ impl Grossmeister { } if score > alpha { alpha = score; - should_pv_search = false; // Once we have PV-node we can start zero-window searching + full_window_search = false; // Once we have PV-node we can start zero-window searching transposition.mov = Some(mov); transposition.score = score; transposition.node_type = NodeType::PV; |