Update index.html

index.html

@@ -41,7 +41,7 @@
             }
             this.is_terminated = function () {
                 // check if the game is terminated
-                const num_empty_cells = this.board.reduce((a, b) => a + b);
+                const num_empty_cells = this.board.reduce((a, b) => a + (b==0));
                 if (num_empty_cells == 0) return true;
                 for (let i = 0; i < this.num_rows; i++) {
                     for (let j = 0; j < this.num_cols; j++) {