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In contract bridge, slam bidding is a strategy used when a partnership believes they can win at least 12 of the 13 tricks. This requires a combined hand strength of at least 33 points and a suitable trump suit. The goal is to ensure the opponents cannot win any quick tricks.

To achieve this, players use control-showing bids. Popular conventions include:

  • Blackwood convention: A bid of four no-trump asks a partner to reveal their number of aces. Responses indicate the quantity of aces held.1
  • Cue bidding: Used when partners have shown strength or agreed on a trump suit, this involves bidding a specific suit to indicate control, such as holding an ace or a void in that suit.2
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