feat: check PV move first but not discard others

1 files changed, 11 insertions, 10 deletions

diff --git a/src/board/engine.rs b/src/board/engine.rs
index 6543d1d..2c6e47a 100644
--- a/src/board/engine.rs
+++ b/src/board/engine.rs
@@ -113,18 +113,19 @@ impl Board {
         let mut principal_variation = Vec::new();
         let color = self.color();
 
-        let moves = match transposition {
-            Some(item) => {
-
-                if item.node_type == NodeType::PV && item.depth >= depth_left {
-                    // println!("Cache hit (depth_left={}): {:?}", depth_left, item);
-                    vec![item.best_move]
-                } else {
-                    self.generate_pseudolegal_moves(color)
+        let mut moves = self.generate_pseudolegal_moves(color);
+
+        if transposition.is_some() {
+            match transposition {
+                Some(item) => {
+                    if item.node_type == NodeType::PV {
+                        // println!("Cache hit at depth {}: {:?}", depth_left, item);
+                        moves.insert(0, item.best_move);
+                    }
                 }
+                None => panic!("Unreachable"),
             }
-            None => self.generate_pseudolegal_moves(color),
-        };
+        }
 
         if depth_left == 0 {
             return (self.evaluate(Some(moves.len() as f32)), principal_variation);