The course
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Step 3 of 3
Unblocking with no way back
Ace, ten, seven in dummy; king, queen, nine, three, two in your hand. You need all five tricks and you have one change of hands in the whole deal — dummy will win a trick here, and getting the lead back out of it is the only crossing you own.
That makes the order of your own cards matter. Spend the wrong one and dummy's ten is trapped behind cards it can never get out from under.
Take 5 tricks. You may change hands 1 more time.
Dummy
Lead from either hand.
Play a card from either hand. Play the line you would play — nothing here is scored, and you can start the suit again whenever you like.