One of the best known conventions is the rule of eleven. Te is a very old rule dating buck to Whist, and although it is known to almost every card player in a general way, very few take advantage of the possibilities this useful convention offers them.
This rule is based on the lead of the fourth best card from the leader's hand. In other words, the player must hold three cards higher than the one led, and may or 'a5 not hold any lower. This rule is applied by subtracting the number of pips on the card led from eleven. The difference will show the exact number of cards higher than the card led, which are not in leader's hand.' Assuming that. the card led is a six of a suit, subtract six from eleven and. remaining five will be the number of cards unaccounted for. If three of these happen to be in the dummy anc the partner holds two, then the declarer will not hold 'a card higher than the six and consequently cannot win the trick in his hand, Tt will easily -be understood this rule is of the greatest value, especially against a no-trump bid.
Text read from the printed page and cleaned; old type leaves the occasional error.