[Phil]

Daveharty your thread titles aren't funny anymore. 2s 4s is I hate my partner bid.

[yunling]

4♠should be a "quantitive" invitation, e.g.6322 or 7222 or some stiff honour.
With slam interest and a void, you must show it.

[cherdano]

rmnka447, on 2013-May-17, 15:20, said:

As others have said North needs to do more. I really think the auto splinter is the way to go.
since it must be construed as at least a mild slam try, responders ♠ can't be too shabby.

If you don't have any agreements about EKCB, you might get there if opener ends up asking.

1 NT - 2 ♥
2 ♠ - 4 ♣(autosplinter)
4 ♦ - 4 ♥
4 NT - 5 NT (odd keycards plus a void)
6 ♠

4 ♥ has to be the ♥ K. Knowing that, at worst, 5 ♠ might depend on a ♥ finesse. So it seems relatively safe for the NT bidder to ask via RKCB.

Opener should bid 4♠ over 4♥ in your auction. After all, he only has 13 working hcp and doubleton support. You don't want to be in slam opposite AQxxxx Kxx Axx x, and responder could be a little weaker than that.
Over 4♠, responder can just bid 6♠.