nige1, on 2017-June-03, 19:24, said:
I rank
- Double = ACTION. Partner might pass. If partner bids 5♥, too bad. Otherwise he is likely to bid 4N = More than one place to play.
- Pass = NAT. You have some defence and ♠s might break badly for opponents.
- 5♣ = NAT. A reasonable shot.
- 4N. ART. ♣s and another. A danger is that we play in a 4-2 or 4-3 ♦ fit.
I assume that LROB means limit raise or better, so LHO could still have values in hand. They might even be heading for six. To double now seems to me like madness. Of course, you may be lucky, with partner passing and turning up with trump tricks or maybe the contract failing in some other way because of cards being badly placed. If so I would be happy to pick up +50.
Again, you could strike it lucky and partner turns up with a great fit, maybe five or six diamonds. Or maybe not. I certainly don't think the odds favour taking the risk.