3NT and pass. I don't think X is bad, if partner bids 4
♠ I'll bid 5
♦. But I'll risk missing a 4-4 heart fit for putting us in the most likely best contract. Plus, matchpoints, come on
I think moving over 4NT is very close. I agree with Fluffy that 4NT is 18-19 bal since 4
♦ and 4
♥/4
♠ are certainly forcing and slammish here. I'm a little worried about the position of the cards in 6
♦ despite the extra info from the preempt. Besides, with a passed partner RHO could have all the missing high cards or could be honor-7th of clubs and a stiff and out. If forced to bid slam I would rather bid 6NT to protect my holdings and since there's a chance LHO is void in clubs. If partner's spade holding is bad enough that we would need spade ruffs, hopefully we'll have enough tricks in the other 3 suits (maybe aim for 2 spades, 3 hearts, 5 diamonds, 2 clubs)
I once yelled at my partner for discarding the 'wrong' card when he was subjected to a squeeze that I allowed by giving the wrong count with too high a card. Now he's allowed to pitch aces when the opponents have the king in the dummy. At trick 2. When he could have followed suit. And blame me.
East4Evil ♥ sohcahtoa 4ever!!!!!1