How are the same hands used by different players in duplicate bridge?
Card editor of the London Field W.H. Whitfeld published this bridge problem in 1885. South is declarer and has the lead with hearts as trump. With a sophisticated finesse, South can win every trick. South begins by leading the ace of diamonds, which, depending on what the opponents discard, opens a possible finesse of North's jack of diamonds. Next, South passes the lead to North with a spade that North trumps. North then leads the last heart, and South discards the 10 of clubs. With the lead of the last trump and then the ace of clubs, the defenders are presented with an insurmountable dilemma. East must hold two diamonds or South takes the last two tricks in the suit by discarding a spade. However, in order to hold on to two diamonds, East must discard the jack of spades, which in turn would force West to hold the queen of spades. Since West also needs the queen of diamonds and the jack of clubs to avoid losing a trick, a discard from any of the three suits will allow South to win all of the remaining tricks by an appropriate discard.
In duplicate bridge, the same hands are used by different players to eliminate the element of luck and compare the skill of participants.12
Instead of gathering cards into tricks, players keep their played cards face down in front of them. Once the hand is scored, the four hands are placed into a rectangular container known as a duplicate board or tray, which features four distinct pockets. This board is then passed to another table, where a different set of players plays the exact same cards under identical conditions, including the same dealer and vulnerability.21
By ensuring that multiple pairs play the identical deal, the game allows for a direct comparison of results. A pair’s performance is measured against all other pairs who played the same board, with the goal of bidding and playing more skillfully than the competition.12