After 1♥ - 2♦ - 3♦ (no interference), 3♠ shows a suit but 4♣ is a cue. Why?
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Cues
#2
Posted 2014-November-15, 20:33
Presumably 3S is needed as "natural" in case 3NT is the spot, not so with 4C.
Wayne Somerville
#3
Posted 2014-November-15, 23:08
After 1♥-2♦-3♦, it could still be that Opener is 4531 and Responder is 4153, in which case you want to play in spades. After the 3♦ bid, you can give up on the chance to play in clubs.
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