How should we play this suit for the most tricks? You have entries to both hands.
DUMMY
A
DECLARER
Q109654
A followed by Q. This allows you to take five tricks (out of 6) in the case of J doubleton. If the K is doubleton, you will always lose a trick to Jxxx, even if you play a low spade out of declarer's hand.
A
J doubleton. If the