[cencio]

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After 2♥-dbl-pass What to bid in sud ?
And explain me this bid:
2♥ Dbl Pass 2nt
Pass- 3♣- Pass 3♥
Pas-4♠ -pas 4nt
pass 5♥ pas 6♠
pas pass pass

[Cyberyeti]

Many people play lebensohl in the south seat with 3♥ showing 4 spades GF, it varies from pair to pair whether direct or via 2n is with or without a heart stop.

4♠ should be weaker than 3♠ here as you are in a GF auction.

Since 2♥ wasn't raised, partner has length in hearts and hasn't bid 2N so you should expect this sort of hand, except that I would probably pass with the N hand leading to 2♥-P-P-X-P-P-P in all probablility for 500.

I would respect partner's 4♠ and pass despite there being hands that will make slam.

[apollo1201]

Small slams require:
- controls in all suits
- 4 keys + Q or 5 keys
- enough material

The latter is usually resolved before launching the rest and remains important also when space lacks. Here from the bidding N seems to be rather min (I would be lying it I said I was a big fan of the TOX) so the combined hands will probably lack some minor stuff for the slam to be good. The sg H with E silent also smells like H values opposite. The S hand despite its promising look with 3 A and a sg cannot drive to slam alone. Knowing the keys is not sufficient to place the contract. I would have passed 4S.