Rule of 12
On 21 October, 2012 At 15:51
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The re-popularization of this lead from the era of Whist is attributed to Mr. Sven Welith and Mr. Seth Wenneberg, both from Sweden. Similar to the Rule of Eleven, which may determine the play of a card by partner, who knows that the lead card is the fourth highest card down as per partnership agreement, the Rule of Twelve is a mathematical calculation from the days of playing Whist when the lead card is the third highest card.
The Rule of Twelve states that the player subtract the number of the card from the number 12, and the result obtained is the number of higher cards than the one led in all of the other three hands.
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