Zelandakh, on 2013-October-17, 04:48, said:
The alternatives are Pass, 2♠ and 3♣. The conditions given in the OP make a 5 card diamond suit much more likely than normal and must surely make Pass a realistic alternative (so 8 or 9 on nige's scale).
The conditions in OP seem crazy to me. If opener bids 2
♣ on a 5242, what on earth does responder do on a 1444 opposite that? The theory of bidding lowest playable suit is potty - it's OK to say that bidding 2
♣ on a weakish 5143 will work OK, and that is probably true, but then what is opener supposed to do with the same shape and 16 or 17 points, where the normal plan is to bid 2
♦ then 3
♣. Can't pard have that? In which case we could be playing in 2
♦ when cold for 6
♣.
Anyway, even on the Nige scale Pass is a 3 and 2
♠ the same. This hand is worth zilch in diamonds if they lead a trump (even if pard is 5251, you probably want to play in clubs) and about four tricks in clubs.
I can see no merit whatsoever in either choice.