diff --git a/src/logic/future_moves.rs b/src/logic/future_moves.rs
index 6460baf..f225ce7 100644
--- a/src/logic/future_moves.rs
+++ b/src/logic/future_moves.rs
@@ -759,4 +759,61 @@ mod tests {
             }
         }
     }
+
+    #[test]
+    fn derive_board() {
+        let mut futm = FutureMoves::new(Piece::White, FUTURE_MOVES_CONFIG);
+
+        let mut b = Board::new().starting_pos();
+        let _ = b.place((2, 3).into(), Piece::Black);
+
+        futm.arena.push(Move::new(
+            Some((2, 3).into()),
+            b,
+            Piece::Black,
+            Piece::White,
+        ));
+    }
+
+    // I can't actually reproduce the issue I got, this is my best attempt
+    // Can't get it to fail!
+    #[test]
+    fn corr_moves() {
+        let mut board = Board::new();
+        board.place_unchecked((5, 4).into(), Piece::Black);
+        board.place_unchecked((4, 4).into(), Piece::Black);
+        board.place_unchecked((4, 3).into(), Piece::Black);
+
+        board.place_unchecked((3, 5).into(), Piece::White);
+        board.place_unchecked((3, 4).into(), Piece::Black);
+        board.place_unchecked((3, 3).into(), Piece::White);
+
+        board.place_unchecked((2, 4).into(), Piece::Black);
+
+        let move_log = vec![
+            (Some((4, 6)), Piece::Black),
+            (Some((5, 5)), Piece::White),
+            // (Some((3, 1)), Piece::Black), // invalid move
+        ];
+        for (m, c) in move_log {
+            if let Some(m) = m {
+                board.place(m.into(), c).expect("invalid move");
+            }
+        }
+
+        let mut futm = FutureMoves::new(Piece::White, FUTURE_MOVES_CONFIG);
+        futm.update_from_board(&board);
+        futm.extend_layers();
+        let best_move = futm.best_move();
+
+        if let Some(best_move) = best_move {
+            assert!(
+                board
+                    .possible_moves(futm.agent_color)
+                    .find(|x| Some(x) == best_move.as_ref())
+                    .is_some(),
+                "futm played an invalid move"
+            );
+        }
+    }
 }