readme: update and minor fixes

README.md

@@ -77,10 +77,11 @@ TODO
 ----
 
 - [X] Support time constraints
-- [ ] Unmake mechanism instead of allocating nodes like there is no tomorrow
+- [X] Unmake mechanism instead of allocating nodes like there is no tomorrow
 - [X] Precompute some pieces moves, maybe (done for knights)
 - [ ] Transposition table that does not actually slows search down
 - [ ] Check Zobrist hashes for previous point
 - [X] Actual bitboard
 - [ ] Some kind of move ordering could be great
 - [ ] Multithreading (never)
+- [ ] Avoid 3-fold repetitions when winning

src/board.rs

@@ -439,7 +439,7 @@ impl Board {
     /// combination of squares either empty or occupied by an enemy
     /// piece they can reach.
     ///
-    /// If `protection` is true, consider friend pieces in rays as well.
+    /// If `protection` is true, include friend pieces in rays as well.
     fn get_blockable_rays(
         &self,
         square: Square,

src/rules.rs

@@ -541,6 +541,16 @@ mod tests {
         assert!(!is_illegal(&mut b, &mut gs, &mut Move::new(E1, F1)));
         let all_wh_moves = get_piece_moves(&mut b, &mut gs, E1, WHITE);
         assert_eq!(all_wh_moves.len(), 2);
+
+        let mut b = Board::new_empty();
+        let mut gs = GameState::new();
+
+        // Pin a pawn with an enemy bishop.
+        b.set_square(E1, WHITE, KING);
+        b.set_square(F2, WHITE, PAWN);
+        b.set_square(H4, BLACK, BISHOP);
+        assert!(is_illegal(&mut b, &mut gs, &mut Move::new(F2, F3)));
+        assert!(is_illegal(&mut b, &mut gs, &mut Move::new(F2, F4)));
     }
 
     #[test]