QT7 opposite AK8x
Difficulty: EasyPlaying for 3 tricks.
The line
Played against West J9xx and East xx. This isn't the likeliest lie. It's the one that beats the most careless play, so it's the most useful to show.
This is one playthrough against one deal. To see what another card would have been worth, or what happens when the king sits the other way, take the same cards to the explorer, where you play all four hands and every card you could choose is priced.
The same cards, a different target
A different number of tricks is a different problem, with its own best line.
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The odds are the share of lies on which this line guarantees the target against best defence (the card that hurts you most, even if a book would play something else).
An entry is counted each time the lead has to change hands after a trick you won, in either direction. The first lead, and the lead after a trick the defenders won, are free from either hand. You start the suit from wherever you are.