Roman Blackwood


This is a way of showing aces were you get better control if responder has 2 aces. If trump is major (or D if response of aces was 5C), the 4NT bidder must bid 5 in the trump suit if the minimum number of aces wasn't enough for slam. Responder must then bit further with maximum number of aces.


4NT-
5C: 0 or 3 aces
5D: 1 or 4 aces
5H: 2 aces without extra values
5S: 2 aces with extra values


Another way is to show neighbor aces. Neighbor to heart is diamond or
spade. Spade is neighbor with club.

4NT-
5C: 0 or 3 aces
5D: 1 or 4 aces
5H: 2 neighbor aces
5S: 2 aces not neighbor

The same answers is used if you ask for kings.