LBengtsson, on 2021-June-09, 21:59, said:
that is interesting way of bidding however if opener has big hand opposite a 2♣gf could there be a bidding accident also? whats the difference between 1♠ - 2♣ - (opener rebid) - 5♣ and 1♠ - 1NT (force) - (opener rebid) - 5♣? and what if opponents intervene over 1♠ - 2♣ and bid up to 4/5 level themselves in ♥/♦. does it not make it difficult for partner to know what hand you have? I know you are 2/1 expert, Stephen, but I go with 1NT forcing route because less chance partner will misinterpret 5♣ after, especially if opps bid 4♥.
So there are several possible reasons I favor 2c over 1nt:
- OK the orig poster specified forcing 1nt but semi-f 1nt is getting pretty popular these days so may not be option for some
- 2/1 actually tend to discourage opener from jumping around with good hand so I will get to complete my description
- I have had considerable problem previously on auction 1S-1nt-3h-? getting to clubs, there is not 100% clearcut std what 4c/5c mean on that auction, it is rare and often undiscussed. Even if you have solid understanding with your partnership on these auctions perhaps 2c follow by 5c should be better suit than 1nt follow by insisting on clubs at high level. You might insist on club with more broken 8 or 7 only rather than something like this.
If the opps bid a lot, hopefully when I bid 5c partner will figure out I did this just holding a lot of clubs. If the opps are already at the 5 level when it gets back to me then there may be problems. But usually 2/1 discourage opps from bidding because they can get in lot of trouble when they don't find good fit and we usu are bidding on more HCP.