28.--If the winner of a trick see two cards when drawing from the stock, he
must show the top card to his adversary.
29.--If the loser of a trick draw the top card of the stock and see it, he
must restore the card drawn in error, and must show the next card to his
adversary; but, if the loser of a trick draw the top card, {26} and the
winner draw the next card and see it, it is too late to rectify the error,
and the players retain the cards erroneously drawn.
30.--If the loser of a trick, after the winner has drawn, see two cards
when drawing from the stock, his adversary has choice of the two cards of
the following draw, and is entitled to look at both before choosing. If he
choose the second card, he need not show it.
31.--If a player see several cards when drawing from the stock, his
adversary has choice of the two cards of the following draw, and then of
the cards of the next draw; and so on, as long as any card which has been
seen remains undrawn; and he is entitled to look at the cards before
choosing.
32.--If there be an odd number of cards in the stock, the last card is not
drawn.