Apply the move to a copy of the board

1 files changed, 1 insertions, 1 deletions

diff --git a/src/move.c b/src/move.c
index b09c4b0..10f9012 100644
--- a/src/move.c
+++ b/src/move.c
@@ -184,7 +184,7 @@ SCM scm_apply_move(SCM scm_move, SCM scm_board, SCM scm_player) {
   struct move move = scm_move_to_c_move(scm_move);
 
   enum player_color **board =
-      SCM_UNBNDP(scm_board) ? get_board() : scm_board_to_c_board(scm_board);
+      SCM_UNBNDP(scm_board) ? copy_board(get_board()) : scm_board_to_c_board(scm_board);
 
   enum player_color player = SCM_UNBNDP(scm_player)
                                  ? get_current_player()