should free the top card of the player's stock, he is at liberty to return to his stock; but he is not obliged to do so. It may happen that after one or more cards from his stock, he is able to dispose of his discard; or he may leave his discard as it is and turn up from his hand, playing perhaps alternately from these three places to his advantage.
The second player, like the first, must be careful to avoid having stops called on him by reason of his failure to play on the ace foundations when able to do so. If there are two identical cards available, he may take his choice, but he must play one or the other. Cards playable on the foundations may be in the tableau, the opponent's stock or discard, or turned up. A stop may be called as soon as a card which is playable on
