RKCB 1430 – Asking for kings
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Dealer:
West
| W | N | E | S |
| 1NT | Pass | 2♣ | Pass |
| 2♠ | Pass | 4NT | Pass |
| 5♥ | Pass | 5NT | Pass |
| 6♣ | Pass | 6♠ | End |
You can go on to ask for kings when using RKCB. The king of trumps is excluded. A simple system is to use the same responses as standard Blackwood. You would do this with all five key cards, to look for a grand slam.
6♣=0, 6♦=1, 6♥=2, 6♠=3