upd

chess0.py

@@ -104,7 +104,7 @@ class ChessSession:
             except ValueError:
                 raise IllegalMove(moves)
 
-            if moves < 1 or moves > 959:
+            if moves < 0 or moves > 959:
                 raise IllegalMove(moves)
 
             self.board.set_chess960_pos(moves)