fix: correclty count legal moves

1 files changed, 3 insertions, 1 deletions

diff --git a/src/board/engine.rs b/src/board/engine.rs
index 2ebbd7d..a710efb 100644
--- a/src/board/engine.rs
+++ b/src/board/engine.rs
@@ -267,6 +267,7 @@ impl Board {
             return (self.quiscence(alpha, beta), principal_variation);
         }
 
+        let mut legal_move_found = false;
         for mov in moves {
             let ep_target_before = self.ep_target.clone();
             let castling_rights_before = self.castling_rights.clone();
@@ -274,6 +275,7 @@ impl Board {
             let captured_piece = self.make_move(mov);
 
             if !self.is_king_in_check(color) {
+                legal_move_found = true;
                 let (mut score, mut subtree_pv) = self.negamax_search(-beta, -alpha, depth_left - 1, deadline);
                 score *= -1.;
                 self.unmake_move(mov, captured_piece, ep_target_before, castling_rights_before, hash_before);
@@ -321,7 +323,7 @@ impl Board {
             }
         }
 
-        if principal_variation.len() == 0 {
+        if !legal_move_found {
             if self.is_king_in_check(color) {
                 return (-VALUE_WIN, principal_variation);
             }