After opponents overcall partner's opening bid with an artificial bid (e.g., Capp, Brozel, Unusual Notrump), responder cue bids the known suit(s) as follows:
a) the cheapest availabe cue bid - shows at least 10 HCP and support for opener's suit.
b) bid the higher cue bid (where 2 suits are known - e.g., Brozel 2D) shows at least 10 HCP and at least five card in the unbid suit (suit other than partner's and the two the overcall has shown)