- * Returns: TTT_CELL_X if X's win. TTT_CELL_O if O's win.
- * The game can then check the value of the return and declare the winner.
+ * Returns: TTT_CELL_X if X's win. TTT_CELL_O if O's
+ * win. TTT_CELL_EMPTY if no win. The game can then check the value
+ * of the return and declare the winner.