#12 North South Vulnerable
South   West   North   East
 1♠        Pass       4♣        DBL
 4NT      Pass      ???
 
North
♠ Q 7 6 5 4 3
♥ A 6 5 4
♦ Q J 10
♣ ——-
 
4♣ is a splinter jump showing club shortness, usually a singleton, plus a hand with slam potential. 4NT is Roman Keycard Blackwood asking for the five keycards and the queen of trumps (spades). First general rule of Blackwood or Roman Keycard Blackwood is that voids are not shown as aces (keycards). When holding an odd number of keycards and a void, jump to six of the void suit. When holding an even number of keycards and a void, bid 5NT. On this hand, North should jump to 6♣ to show one keycard (♥A) and a void in clubs.
 
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