Posted 2014-November-17, 23:32
At MPs, I'd simply bid 4 ♠.
North has a 5 loser hand and a 7 card ♠ suit. With the intermediates, the ♠ suit should have no more than 2 losers against 4-2 and 3-3 distributions if opener is void or against 4-1 and 3-2 distributions if opener has a stiff.
If South has the right cards, a ♠ slam may make. But 4 ♠ seems like a good spot to play. After a preempt, it's important to get to a good spot rather than the perfect spot.
Although South has no fit, South should realize North has long ♠s and pass.
If South decides to bid 5 ♦ over 4 ♠, then North should raise to 6 ♦. After a 5 ♦ bid, 4 ♠ seems like a pretty sure make. In that case, 5 ♦ making 5 rates to be a bad result. 6 ♦ off 1 won't be much worse. 5 ♦ making 6 just equals 4 ♠ making 4, but loses to 4 ♠ making 5. So bidding 6 isn't going to penalize you much if it doesn't make, but changes an average or below average board to the a top/near top when it does.