refactor: cleanup PVS

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;