Gerber Convention

A response of 4C after a 1NT or 2NT opening, is asking Opener for Aces.

Responses	Re-bids
4D with 0 or 4 Aces	4NT, 6NT or 7NT which Opener will pass, or 5C which is asking for Kings on the same scale
4H with 1 Ace
4S with 2 Aces
4NT with 3 Aces