Blue Uriah, on 2011-May-20, 04:20, said:
So let's say you're deep into a competitive auction and partner has bid 4♣. You have a bit of a think about it and come to the conclusion that it's a control bid making a slam try in spades. You're 100% sure about this given everything you know about the system and past partnership discussions and so on but there's a chance that partner isn't on the same wavelength and thinks it's lead-directing in case you end up on defence. You have a marginal hand that maybe should cooperate in a slam auction but you decide to play it safe and sign off in 4♠.
So have you done anything wrong? You're taking into account the possibility of partner misbidding and continuing the slam auction is definitely a logical alternative. If not, why is it different to the Drury scenario?
Notwithstanding the EBU's approach, the Laws allow you to bid whatever you want to. There are, however, two things that the partnership can't do:
- Fail to disclose its agreements properly. If 4
♣ is systemically a cue-bid but possibly intended as lead-directing, you should describe it as "systemically a cue-bid but possibly intended as lead-directing". Likewise, if a 2
♣ bid is systemically Drury but possibly intended as natural, opener should describe it as such.
- Play an illegal method. If it's illegal to play 4
♣ as two-way - either a cue-bid or a suit - your partnership is breaking the rules, regardless of how you choose to act in reply. Similarly, if it's illegal to play 2
♣ as two-way, the OP's partnership is breaking the rules, regardless of what opener chooses to bid.
As I understand it, in both situations the EBU has decided that if you appear to cater for a misbid you will be deemed to have an agreement to play the bid as two-way. If you fail to disclose that presumed agreement, they declare the board unplayable and give you an artificial bad score. If you have disclosed that agreement and it's not illegal to have it, you can't be penalised. Somebody else may be able to explain why the EBU think this procedure is legal.
In practice there seems to be a corollary: if a partnership often forgets its agreements but never caters for the possibility, the partnership is unlikely to be penalised for failing to disclose the implicit agremeent, even though they are no less guilty than a partnership that fields the misbid.