[thorvald]

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Playing MP in the Country vs Country Championship, I had the hand in south.

4♣ is a slaminvite with 5-5, and might be a slight overbid, but now North bid 4♠ as natural and I was stuck

4N=Blackwood with ♠, showing 4+♠, 5+♥ and 5+♣
5♣=Showing 6+♣
5♦=6+♦, 5+♥, 5+♣

Interesting is that 5♥, just repeats the same meaning as 4♣ (So in reality not defined)

But first time I have seen how to bid a 0565 hand

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[Frank_lol_]

Bidding a 554x hand is also new to me.

[Jyrki_63]

If N bidding is to make sense (a big if, but let's try anyway) the 4S bid should also be a cue bid denying the ace of diamonds. A fit in one of your suits is implied. Because you don't have a diamond control, I would just bid 5C and hear what N says next. The actual hand probably passes unless it somehow divines that you must really have diamond shortness (which is why it made the invitation).

Of course, I may have made one or two unwarranted assumptions about the meaning of 4S. The descriptions of the continuations are off for sure.

Who knows? If N raises you to 6C, West may lead a safe heart :-)

[smerriman]

I've seen GIB actually make a bid showing 15 cards before. But 16 is a new high (albeit not actually bid)

Pretty tough one for the robot to handle though. It has 3♦ and 3♠ agreeing the minor over 3♣ as specifically programmed sequences, but after 3NT is falling back on generic rules and descriptions, where it simply can't work out there may be implied fit cues available the way it's programmed.

So it always loves bidding a new suit 'on the way' after that, and you could have 3 spades after all so it can't eliminate 4NT as Blackwood.. leading to trying to squeeze too many things into too few bids. GIB in South would have bid the same way you did, and it turned out well at least.

[thepossum]

I've never tried adding up GiB's bid descriptions before. Are they what is used in simulations?

You do need and hope for some flexibility in bidding though or it would break