All doubles, except the double of one Spade by the Second Hand, which is really an informatory bid,[[20] ] are made for the purpose of increasing the score of the doubler.
The old idea of informatory doubles has been abandoned. Now when a player doubles, he does not invite a No-trump by showing one or more tricks in the adversary's suit, but he practically says, "Partner, I am satisfied that we can defeat this declaration, and I desire to receive a bonus of 100 instead of 50 for each trick that our adversaries fall short of their contract. I do not wish you to overbid, unless your hand be of such a peculiar character that you have reason to believe the double will not be very profitable and feel sure that we can go game with your declaration."
Although doubles are made under widely divergent conditions, they may be subdivided into two classes:—
1. The double of a declaration which, if successful, will result in game, regardless of the double, such as four Hearts, with a love score.
2. The double which, if unsuccessful, puts the Declarer out, although if undoubled, he would not secure the game by fulfilling his contract, such as two or three Hearts, with a love score.
In the first instance, the doubler has nothing to lose except the difference in points which the Declarer may make as a result of the double. When, for example, a bid of four Hearts is doubled and the Declarer fulfils his contract, the double costs exactly 82 points. If the Declarer fall one trick short, the double gains 50 points. When, however, there is a redouble, the loss is increased 114 points, the gain 100 points. The doubler is, therefore, betting the Declarer 82 to 50 that he will not make his contract, and giving the Declarer the option of increasing the bet, so that the odds become 196 to 150. It is evident, therefore, that even when the Declarer will go out in any event, it is not a particularly advantageous proposition for the doubler to give odds of 8 to 5 or 20 to 15, if the chances be even. When the declaration is Royals or No-trumps, the odds against the double are increased. If four No-trumps be doubled, the figures are 90 to 50 with the option given to the Declarer to increase them to 220 to 150.
The explanatory remark so often heard after an unsuccessful double, "It could not cost anything, as they were out anyhow," is not an absolutely accurate statement. It may be worth while to consider one ordinary illustration of how many points may be lost by a foolish double of this character. A bid of four Hearts is doubled and redoubled. The Declarer takes eleven tricks, as he is able to ruff one or two high cards which the doubler hoped would prove winners. This is an every-day case, but the figures are rarely brought home. Without a double, the Declarer would have scored 40 points; with the redouble, he scores 160 points and 200 bonus, or 360, presented by an adversary, who hoped at most to gain 50 and thought his effort "could not cost anything."
A doubtful double should not be made when the partner has another bid, as, for example, when the adversary to the right has called four Hearts, over three Royals declared by the partner. Under these circumstances, the double, on the theory that the doubler expects to secure a large bonus, may properly deter the partner from a successful four Royals declaration. Even when the double is successful to the extent of 100, that is not a sufficient compensation for losing the opportunity to win the game.
The fact that a good player has declared an unusually large number of tricks, as, for example, five Hearts, is not in itself a reason for doubling. A player of experience, when he makes such a declaration, fully realizes the difficulty of the undertaking. He does not take the chance without giving it more consideration than he would a smaller bid, and it is only fair to assume that he has a reasonable expectation of success. Doubling, therefore, merely because the bid requires ten or even eleven tricks, is folly, pure and simple. This comment, however, does not apply when the bid is of the flag-flying character.[[21] ] As to whether or not it comes within that category the doubler will have to determine. The Auction expert is always on the lookout for an opportunity to gather a large bonus at the expense of a flag-flyer, and as unduly sanguine players indulge in that practice more than others, their declarations should be subjected to the most rigid scrutiny.
The doubtful double, which, should it prove unsuccessful, will result in the Declarer scoring a game he would not otherwise obtain, is, as a rule, inexcusable. By this is not meant that a bid of two or three Hearts or Royals, or of three or four Clubs or Diamonds, should never be doubled. That would be absurd doctrine, but such a double should never be made with the chances even, or nearly even. An experienced bidder will not risk presenting the adversaries with the game and a bonus unless reasonably sure of defeating the declaration.