Board 05
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Dealer:
North
Vuln:
N/S
| W | N | E | S |
| 1♠ | Pass | 2♦ | |
| Pass | 3♦ | Pass | 4NT |
| Pass | 5♥ | Pass | 5NT |
| Pass | 6♦ | Pass | 7NT |
| End |
Contract:
7NT by South
Lead:
♣5
South starts with a quiet 2♦ response. North's 3♦ shows a minimum hand with 5 spades and 4 diamonds. South is interested in a diamond slam, and can afford to use RKCB, because with no aces the response will be 5♦, which can be passed.
When partner shows both missing aces, South can see twelve tricks even in no-trumps, and a single king in partner's hand would make thirteen. (Even if North has ♣K without ♥K, and opponents lead a club, dummy will have an entry in diamonds after the spades are unblocked.) South asks about kings with 5NT and finds partner with one, so bids 7NT.