31 10 rkcb意思

"31 10 RKCB" is a bidding sequence in the game of bridge. It is used in the auction to ask for and receive information about the number of keycards (aces and kings) an opponent holds in their hand.

Here's a breakdown of the sequence:

• 31: This is a bid that doesn't mean anything in terms of points; it's an artificial bid used to initiate the RKCB convention.
• 10: This is another artificial bid that, in combination with the 31 bid, asks about the number of keycards the partner has. The number here (10) doesn't refer to the number of points or the suit of the bidder; it's part of the RKCB convention.
• RKCB: This stands for "Roman Key Card Blackwood," which is a convention used to inquire about and reveal the number of keycards (aces and kings) an opponent holds in their hand. It's an extension of the Blackwood convention, which only asks about aces.

When a player bids "31 10 RKCB," they are using the Roman Key Card Blackwood convention to ask their partner how many keycards they hold. The responses will typically be in the form of bids that indicate the number of keycards held by the partner. The responses might be:

• 4NT: 0 or 4 keycards
• 5 ♣: 1 or 3 keycards
• 5 ♦: 2 keycards
• 5 ♥: 1 keycard and the queen of trumps
• 5 ♠: 1 keycard and the queen of trumps

The queen of trumps is considered a "semi-keycard" in this convention, as it can be useful for making a slam contract.

This bidding sequence is used when both partners are interested in bidding a slam (typically a small slam, which is a contract of 12 tricks) or to gather information about the opponent's hand to make an informed decision about the contract.