[ochinko]

Imps, None vul, Expert opps, RHO is a star player.
Partner deals and passes, you hold:

♠ 10953
♥ K73
♦ K652
♣ A10

You both pass all the way. The bidding from opps goes:

1♣ - 2♣*
2NT - 3NT

* - inverted minors

What do you lead?

[whereagles]

zmall zpade

[Hanoi5]

♠10

[the hog]

S

[dicklont]

♦2

[kfay]

♦, I think leading a spade is asking partner to have too much.

[gwnn]

reverse flannery (♦2) because it's the fourth largest card from my longest and strongest suit.

[Apollo81]

Diamond. Opener probably doesn't have four if he is honest. I don't agree that a spade is asking partner to have too much; we could easily hit Axxx or a 5 card suit. In fact, there are some people aganist whom I'd lead a spade (people that i know open weaker minor and who arent up to double crossing me)

[pclayton]

Low diamond or a low spade. I don't think there's much difference frankly.

[oldman5757]

At IMPs, I'd lead the ♦2. QJX, or even Q10x from P could be enough. If I lead a spade, I need P to have something like Axx or Axxx, and even that may not be enough.

[skjaeran]

♦2. Obvious lead, anyone in doubt can ask my partner.

[Edmunte1]

I see 3 choices ♠, ♦ or ♥. This is that kind of board where you have to make a good wish: partner has at maximum 5-6 hcp, and opps have a source of tricks and as long as ♣A will be knocked out, they will usually make the game. Let's take a deeper look on every lead:

-♠ lead - will work when partner has ♠ length and honours, and it's has a pretty small success expentacy: needs to find partener with Axxxx (and ♠ to be 22) or KQxxx.
-♦ lead - probably best in MP's has some flaws. If inverted minors denies 4 cards major, it has frequntly 3+card in other minor (3325, 3235, 2335, 3145, 2245, 1345 are the most frequent shapes). Adding 2+♦ in the opener's hand, it's pretty improbable that partner has a 5 carder in ♦. So usually in the best case we will make 4 tricks in diamonds, and this means it's not late to play diamonds even after we'll play ♣A (3♦+♣A is not good enough)
-♥ lead - pretty strangely, has a bigger chance of success than ♠ or♦. It needs Axxxx in partner's hand (or QJxxx and Ax in opps hand). And it's more probable than ♠ lead, because we have an increased chance to find a 5 carder in our 3 card suit, than in a 4 card suit, and it doesn't depend on ♥ lying 22, as in ♠.
So statistically ♥ lead should work better than ♠ lead or ♦ lead

[joker_gib]

Not a ♣

Likely a passive ♠

[dcvetkov]

Who opened the bidding? RHO?

Then I expect at least 1 of my kings to win, which means I may have another chance to strike the right suit, after ace of clubs is knocked out. It is not guaranteed that they have 9 tricks for taking after club ace is knocked out, unless one opp has 6 clubs.

I think I will still stick with a small spade, and hope partner has 5 with honour, Q10xx, QJxx, or some other helpful holding . If spade is dead wrong, then then we have to take 3 quick tricks after I win hopefully one of my red suit kings.

in MP, blowing overticks is always consideration, so I would lead spade for the same reason