[cencio]

During a bbo game I saw this auction. After reaching the contract of 4 spades responder bids 5 diamonds with empty in diamonds and asking bid for the queen of spades. the declarer responds 6 clubs having the queen and signaling the k of clubs, with subsequent closure at 6 spades.

I would like to understand what convention it is and how it works.

Thanks for any respons

[PrecisionL]

cencio, on 2026-March-19, 08:18, said:

During a bbo game I saw this auction. After reaching the contract of 4 spades responder bids 5 diamonds with empty in diamonds and asking bid for the queen of spades. the declarer responds 6 clubs having the queen and signaling the k of clubs, with subsequent closure at 6 spades.

I would like to understand what convention it is and how it works.

Thanks for any respons

This does not appear to be anything other then a Cue bid in diamonds showing interest in a spade slam. The whole auction needs to be shown to know what the exact meanings of 5♦ and 6♣ mean. You assumed Q♠ and K♣.

[cencio]

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[jillybean]

1♠ opening bid
2♣ game forcing in a 2/1 auction
2♥ natural
3♠ unusual jump but agreeing spades
4♠ natural
5♦ cue bid in support of spades, void (Ace , King, singleton or void)
6♣. cue bid, K
6♠

This does not resemble an expert standard auction but got the job done.

[P_Marlowe]

jillybean, on 2026-March-19, 12:38, said:

1♠ opening bid
2♣ game forcing in a 2/1 auction
2♥ natural
3♠ unusual jump but agreeing spades
4♠ natural
5♦ cue bid in support of spades, void (Ace , King, singleton or void)
6♣. cue bid, K
6♠

This does not resemble an expert standard auction but got the job done.

3S ... it is always a debate, if 2S showes support or could be based on 2 cards, 3S also showes SI
4S min, 4C may be better, showing either A / K, but it is a crappy opening bid
5D is 1st round control, a void somewhere
6C I am not sure, I would have found the bid, but given that 2C showed clubs and 4S min,
it is a pretty good bid. I may have bailed out

I think the auction is not too bad.

[jillybean]

P_Marlowe, on 2026-March-19, 14:45, said:

3S ... it is always a debate, if 2S showes support or could be based on 2 cards, 3S also showes SI
4S min, 4C may be better, showing either A / K, but it is a crappy opening bid
5D is 1st round control, a void somewhere
6C I am not sure, I would have found the bid, but given that 2C showed clubs and 4S min,
it is a pretty good bid. I may have bailed out

I think the auction is not too bad.

2S is not a debate and shows 3 card spade support for ambiguous 2♣GF players.
N/S got to the slam but its not a great auction.

cencio, I'd be wary of learning systems from watching BBO players, unless the players are known experts.