awm, on Nov 7 2006, 08:11 AM, said:
To compare, let's take an example from one of hrothgar's favorite systems:
1♦! - P - 2♣
The 1♦ bid is alerted and explained as 4+♥, 9-14 hcp, maybe longer side suit. Now 2♣ is bid. Without FD, it's possible that the 2♣ bidder forgets to alert. But with a rudimentary understanding of Moscito, I know that it's reasonable to ask the meaning of 2♣. An ethical RHO (forget or no forget) will now explain whether 2♣ shows clubs, whether it's forcing, various inferences about values and/or heart length, and so forth.
But now suppose these opponents are using FD. We see the same auction, but FD may announce that 2♣ shows "5+♣, 0-2♥, less than 11 hcp, NF." Unfortunately this is one of the things that seems to change in different versions of Moscito, and there's a fair chance the real agreement is different than this. Unsuspecting, I pass... but opponents' real agreement is to play 2♣ transfer to diamonds, and opener bids 2♦ (explained by FD as a natural suit without club tolerance) and everyone passes. Note that here, I don't realize what has happened until dummy is faced. At this point it's too late to ask questions or get an undo (say I wanted to bid clubs over a transfer 2♣ but pass throughout given RHO has clubs). Now I need a director, who has to understand the situation and figure out what "would've happened" if I'd been correctly informed -- not an easy task when the director is handling dozens of tables and impossible in most team games.
Without FD, wrong explanations are much less common. When they do occur, often it means that opponents didn't have a clear agreement and weren't on the same page in which case often a director isn't needed (they're headed for trouble anyway). Only with FD is it possible that opponents have an agreement, and both know the agreement, but yet opponents are still misinformed.
I agree that FD is useful in working out your methods and improving your system. I'm just not convinced that it's useful as a substitute for alerting and posting a CC in serious play.
This is not a FD problem. It happens even with the old-style CCs. Somebody loads the BBO sayc CC and don't know about the "..." things and so their bids diverge from their CC. At least with FD, you can see the explanation of a bid before you make it and thus you are less likely to bid 2♣ with the wrong hand type. I think that CCs and FDs are primarily useful for established partnerships and/or rigorous tournaments. In the "killing time" tournaments people play now it is unreasonable to expect people to fill out a CC or FD and know what is on it for a 12 board tourney.

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