THE FINESSE OBLIGATORY
This is an arbitrary finesse, which is often forced upon you, when, unless the cards of a suit are in a certain position, there is no possibility of winning. Perhaps the best way of defining the finesse obligatory is to give an example showing the position as it most frequently occurs:
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“Z” is the dealer, and leads a low card to the king in dummy, which wins the first trick. The suit is returned, the ace being marked with “A.” If “A” holds both ace and knave, no matter how the dealer plays, “A” must win two tricks. Unless the knave is in “B’s” hand, and “A” holds the singleton ace, the adversary must win two tricks. The dealer should, therefore, play his lowest card, not the queen.