Heart 6 opening lead to KING and EAST plays the ♥5. Opponents lead 2/4 leads.
At this point, with 6♦, 3♥, 2♣ and 1♠ you have 12 tricks. What lines of play do you see? Either black suit finesse obviously if guessed right will see you home. Is it better to play for singleton Spade King then hook clubs, or doubleton club queen then hook spades (if no luck in other suit). How about a vienna coup, cash spade ACE and use spade NINE as threat against an opponent (presumably WEST who holds ♠KT and ♣Q? Or cash ♠Ace and use the spade queen as a threat against EAST for a showup squeeze should WEST have doubleton club Q
Chance of doubleton or singleton club Queen is just less than 5%. Chance for singleton spade King is less than 1%. So the combined play, tryign to drop the club Queen then if necessary hook the spade king begins to look good. But on the play some "useful" stuff happens...
T2. ♦K-♦-♦-♠T
You determine the spade ten is a postive signal in ♠ confirmed by subsequent play, so the ♠ hook appears to be off....
T3. ♦T-♦J=♦A=♠2
T4. ♦x-♠4-♦x-♦x
When you cas diamonds, West throw one more spade, the ♣8 then ♣2 and finally another small ♠. East throws the ♠7 and then the ♥4.
To trick 8, you lead a spade to the ACE, east discards the ♥9 and WEST the spade 5. Only ♠K is out now. You cash the ♥AJ East follows once and discards a club, West follows to both.
The hand is now cold. If EAST has club Queen, finessee, if WEST has club queen, he only has two clubs left and it will drop.
Considerations.
1. West signalled high low in clubs, but would he volunteer that he had the club queen setting himself up for the vienna coup?
2. Clubs were 4-4 so each opponent is equally likely to have the club Queen based on clbus. (west 6-3-0-4, East 1-4-4-4).
3. West might have choose to lead a club from xxxx as opposed to a heart from Txx so restricted choice might apply, making west more likely to have the queen.
4. If it matters, West is a BBO gold star, so is south.
5. If you hook and are wrong, you are down two. If he play for the vienna coup and are wrong you are down one.
6. Making a squeeze is sooooo much more fun than a simple finessee.
If West has the club Queen, what do you think of WEST's defense. If West lacks the club queen what do you think of it. Should west have ever shown the spade King if he had both black cards.
How do you play and does WEST club "signal" alter you line (assuming you discovered the ♠King but WEST played clubs up the line rather than hi-lo).

Help

1N 2N
3♦ 4♦
4♠ 4N
5♦ 7♦
7N Pass
2NT = ♦
3♦ = super accept