With a moderate sequence, such as queen, knave—knave, ten—ten, nine—you play the lowest of the sequence if you are numerically weak; but, with more than three cards of the suit, you pass a small card led, agreeably to the principle already discussed—that in weak suits you play to strengthen your partner, but in strong ones you leave him to help you. For instance: the leader (A) has king, ten, nine, eight, seven of a suit; the second player (Y) has queen, knave, and one small one; the fourth player (Z) has ace and two small ones. A leads a small card; Y should play the knave; if he does not, the card led forces Z's ace. It is true that this happens also if Y passes with queen, knave, and two small ones; but Y, in this case, has a guard to his queen and knave, and is left with the two winning cards after the second round of the suit.
With a sequence lower than ten, nine, there is no advantage in putting on one of the sequence; so the lowest should then be played second hand, in conformity with the general principle.
7. PLAY THE LOWEST OF A SEQUENCE.
When you do not head a trick, you throw away your lowest card to economise your strength. Thus, with queen and two small ones, you would not throw the queen to king led. It is an error to suppose that it is of no consequence which card you play when you hold only small cards or cards in sequence. It is not of much consequence as regards merely the chance of making tricks; but it is of great importance in affording information to partner.
Thus, suppose the players to be as before, A, Y, B, Z. A leads the three of a suit, Y plays the five, B the four. It ought to be certain that B has no more of the suit, it being presumed that he, not being able to head the trick, throws away his smallest. If he afterwards plays the two, and it turns out that he previously played the four through carelessness, his partner loses confidence, and gives up all hopes of drawing correct inferences from his play.
The principle applies equally to cards in sequence. Thus, say queen is led, and you (second hand) hold ace and king; if you put on the king, your partner gains the very important information that you have the ace also. For queen is not led from ace, queen, &c., so the leader cannot have the ace; the third hand cannot have it, or he would win the king; and the fourth, not having it himself, infers that you have it. If you put on the ace, not only could he not tell that you hold the king, but would assume that it lay with the leader's partner. The principle, though stated for the sake of convenience in respect of the second hand, applies to the third and fourth hands also. (For a fuller examination of this point see Section 12.)
