[campboy]

 johnu, on 2014-June-13, 00:35, said:

First, if you are in a more than pickup partnership, you may be playing kickback, so you always have room to make a queen ask. If you aren't playing kickback, you can't afford to RKC with only 3 key cards if your suit is clubs, since a 5♦ response will take you past your security level of 5♣. I suppose you can play 0314 responses if the suit is clubs, and 1430 otherwise, but this is an accident waiting to happen

I think 1430 generally gains for clubs. Yes, it goes wrong when you have 3 keycards and want to know whether partner has 0 or 1, but more commonly (in my experience) you have 2 keycards and want to know whether partner has 1 or 2.

[Lovera]

 campboy, on 2015-March-22, 03:51, said:

I think 1430 generally gains for clubs. Yes, it goes wrong when you have 3 keycards and want to know whether partner has 0 or 1, but more commonly (in my experience) you have 2 keycards and want to know whether partner has 1 or 2.

It' d be suggest for the case of 0 keys to save 5♣ bidding. For the other situations should be ininfluent if 30 or 14.