East leads the double-five
Puzzle
You are South. You bid 32 and named sixes as trump, so every domino with a 6 on it is a trump.
You won the first three tricks. Then East took the fourth one with the double-trey and got the lead. Your side has 18 points. East and West have 1.
East leads the double-five. That is a dime, worth 10 points to whoever wins the trick. West plays after you, then North, your partner.
You have three dominoes left: the six-blank, the deuce-blank, and the double-ace. You have no fives, so you can play anything. The six-blank is a trump, the lowest one there is.
Go back over the first two tricks and count the sixes. Then decide: do you trump the double-five, or hang on to the six-blank?
The answer is up tomorrow morning.
