[nullve]

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You reach 3♥ after a crazy 2♥ overcall and West leads the ♣K.

How many cards do you think West has in each suit?

[steve2005]

4 spades looks right
seeing what card east plays on trick 1 will help you with the clubs

[manudude03]

Hiding answer in spoilers

Spoiler

Opps have 8 spades yet East denied 4 spades, so spades appear to be 5-3. This gives West at least 6* clubs and as East also doesn't have 4 hearts, West should have at least 2. This makes West 5206.

*Some people open 1C with 5-5 in the blacks, which would allow West to be 5305 or 5215.

[pilowsky]

My dog does bark in the night - at almost anything.

With an 8 card Spade fit, playing SAYC or 2/1 or even Acol (I think), West or East should be bidding spades.

Spoiler

But, with Precision + transfers West could have the following and 1NT is a transfer to clubs.
In which case West must have 16+ HCP 'any' and East should have more than 6 clubs.
I'm going with something along these lines:

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[nullve]

nullve, on 2021-March-11, 20:01, said:

and West leads the ♣K.

The deal is from an ACBL Robot Duplicate (18 boards) - Matchpoints tournament I played in and the opening lead was actually not the ♣K but the ♠Q.

Can you place the remaininng East-West honour cards (♠A,♠K,♠J,♦Q,♦T,♣A,♣K)?

[Cyberyeti]

nullve, on 2021-March-13, 05:30, said:

The deal is from an ACBL Robot Duplicate (18 boards) - Matchpoints tournament I played in and the opening lead was actually not the ♣K but the ♠Q.

Can you place the remaininng East-West honour cards (♠A,♠K,♠J,♦Q,♦T,♣A,♣K)?

Spoiler

in that case leader has QJxxx, xx, void, AKxxxxx and their partner has AKx, xxx, Q108x, xxx and they must be playing a system where that hand responds 1N rather than 1♦ and one where they open 1♣ rather than 1♠

The consequences of this are that you play it pretty much double dummy and make 10 tricks.

Spoiler

draw 2 trumps, ruff the 4th diamond high and only then draw the last trump and cash the remaining diamonds

[sfi]

It's really hard to construct a layout where West does not have a 2S bid on the second round of the auction. All the information leads to Cyberyeti's answer, but West's pass is very conservative and means E-W missed their making game.

[nullve]

nullve, on 2021-March-13, 05:30, said:

The deal is from an ACBL Robot Duplicate (18 boards) - Matchpoints tournament I played in and the opening lead was actually not the ♣K but the ♠Q.

Can you place the remaininng East-West honour cards (♠A,♠K,♠J,♦Q,♦T,♣A,♣K)?

Cyberyeti, on 2021-March-13, 06:25, said:

in that case leader has QJxxx, xx, void, AKxxxxx and their partner has AKx, xxx, Q108x, xxx and they must be playing a system where that hand responds 1N rather than 1♦ and one where they open 1♣ rather than 1♠

The full deal:

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[Cyberyeti]

So top defence beats the contract, but tough to overtake ♠Q and return a diamond, particularly on this auction.

Even so small compensation for not bidding the cold 4♠

[nullve]

A deal from yesterday:

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Lead: ♣9

Your opponents' convention card: https://www.bridgeba...ystem_notes.php

What do you know about East-West's hands?

[Cyberyeti]

nullve, on 2021-December-19, 15:57, said:

A deal from yesterday:

---

Lead: ♣9

Your opponents' convention card: https://www.bridgeba...ystem_notes.php

What do you know about East-West's hands?

Enough to play this double dummy

Spoiler

W opened 1♦ with 3, hence as per the cc he is 4432.

He doesn't have ♣Q so the only missing honours are required to give him an opening bid, hence he has Qxxx, AKxx, Kxx, 9x

[johnu]

nullve, on 2021-December-19, 15:57, said:

Your opponents' convention card: https://www.bridgeba...ystem_notes.php

What do you know about East-West's hands?

Playing against 2 GIB's, not much.

[thepossum]

nullve, on 2021-March-11, 20:01, said:

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You reach 3♥ after a crazy 2♥ overcall and West leads the ♣K.

How many cards do you think West has in each suit?

5 spades, 2 hearts, 2 clubs and whatever is left in diamonds
I have no idea
It looks impossible to me in 4 or 5 card majors
I'm basing it (for no reason at all) on them leading from AK

Alternatively 4 hearts, 4 spades,3 clubs, 2 diamonds and a strange lead - but then the 1NT could possibly have been 1 major