With a Trump. When third hand makes no attempt to win the trick, either because his partner’s or Dummy’s card is better than any he need play, he plays the higher of two cards only, the lowest of three or more. This is called playing down and out. Suppose third hand holds 7 and 2 only, and the lead is a King. The 7 is played. The leader goes on with the Ace, denying the Queen, and the third hand plays the deuce. If the Queen is not in the Dummy, the declarer must have it. In any case, the leader knows that if he goes on, his partner, the third hand, can trump that suit.
With three cards, the lowest falling to the first round, followed by a higher card, will show the leader that the third hand still has another of that suit.
It is not necessary to play down and out with an honour, because the leader can read the situation without it. Suppose third hand holds the J 5. He plays the 5 to the first round, because one of his two cards is an honour. The leader goes on with the Ace, and the Jack falls. Now the third hand must have the Queen or no more, and no matter which it is he can win the third round, with the Queen or with a trump.
Against No-Trumpers. When there is no trump, the third hand uses what is called the Foster echo. This consists in playing always the second-best of the suit, when no attempt is made to win the trick. Suppose the leader begins with the King. Third hand holds 10 8 7 4, and plays the 8. This marks him with only one card higher than the 8, and is a great exposer of false cards played by the declarer.
On the second round, the rule is, always to keep the lowest card of the suit until the last. If third hand held four originally, 10 8 7 4, his play to the second round is the 7, keeping the 4. If he held 10 8 7 only, his play to the second round would be the 10, keeping the 7. This makes it clear to the leader how many and what he holds.
High Cards Third Hand. When the third hand tries to win his partner’s lead, he does so as cheaply as possible. That is, holding both King and Queen, he plays the Queen, not the King. If his cards are not in sequence, he should always play the best he has. With Ace and Queen, for instance, he must play the Ace if the King is not in the Dummy. To play the Queen would be to throw it away if the declarer has the King. If the leader has the King, third hand gets out of his way by giving up the Ace.
FOSTER’S ELEVEN RULE. In trying to win tricks as cheaply as possible, third hand may often be guided by the Eleven Rule, which can be applied to any lead of a small card.
By deducting from eleven the number of pips on any low card led by his partner, the pone may ascertain to a certainty how many cards there are higher than the one led, which are not in the leader’s hand. This rule, which was invented by R.F. Foster in 1881, in connection with the game of whist, is now used by everyone with any pretensions to being a bridge player. The rule itself is this:—
When the eldest hand leads any card which is not an honour, deduct the spots on it from eleven. From the remainder thus found, deduct the number of cards, higher than the one led, which are not in your own hand nor in Dummy’s in that suit. This final remainder is the number of cards which are in the declarer’s hand which are higher than the card led. The principal thing to remember is, that it is only the cards higher than the one led that you need trouble about. To illustrate:—