Opening lead ruffed

[rod]

Here's an odd little hand. With no opposing bidding you are declarer in 4♠.

♠ Q105
♥ 1064
♦ 84
♣ KJ652

♠ AK632
♥ A
♦ KJ975
♣ A10

The opening lead is the ♣7. It looks like a straightforward hand except when you play low from dummy, RHO ruffs with the ♠4 and returns the ♥K.

Your plan?

[rod]

Without going into excruciating detail, it looks right to drop the ♣A at trick 1. RHO is likely to have started with 4 trumps and you may need a club entry to dummy in order to lead towards your diamonds twice. My thinking is to draw trumps ending in dummy to avoid a second club ruff and then run the ♦8 and hope for the best.

The opposing hands were:

♠ J
♥ J973
♦ Q3
♣ Q98743

♠ 9874
♥ KQ852
♦ A1062
♣ --