Fix has_repeated bug while probing TB (#1029)

Bench: 2851948

Author: Saphereye

src/board.rs

@@ -260,8 +260,9 @@ impl Board {
         self.state.repetition != 0 && self.state.repetition < ply
     }
 
-    pub const fn is_repetition(&self) -> bool {
-        self.state.repetition != 0
+    pub fn has_repeated(&self) -> bool {
+        let end = self.state.plies_from_null.min(self.state.halfmove_clock as usize);
+        self.state_stack.iter().rev().take(end.saturating_sub(3)).any(|s| s.repetition != 0)
     }
 
     pub fn draw_by_fifty_move_rule(&self) -> bool {

src/tb.rs

@@ -117,7 +117,7 @@ pub fn rank_rootmoves(td: &mut ThreadData) {
             0,
             ep_square,
             td.board.side_to_move() == Color::White,
-            td.board.is_repetition(),
+            td.board.has_repeated(),
             true,
             tb_ptr,
         );