(1D) : 1H : (P) : 2D = good H.C.P. raise or non-single suited GF. 2S = GF with 6c Spades. 3D = stopper ask. 4D = good raise with Diamond void.
(1D) : 1H : (X) : XX = includes general GF hands. 2D = good H.C.P. raise. 2S = fit showing, typically 5cS & 4cH.
Responses to step 1:
egs. (1NT) : 2D : (P) : 4C/5C = convertible.
(1NT) : 2D : (P) : 2H (P) : 2S : (P) : 2NT = invitational, natural. 3C = step, to play in minor. 3H = weak escape.
(1NT) : ASPRO : (step) : X = competitive values, would have bid step. Takeout unless Asproer's 2nd suit.
(1NT) : ASPRO : (Higher than step) : X = penalty. New Suit = natural, NF.
(1NT) : 2D : (bid) : 3C/4C = convertible to minor. (1NT) : 2C : (2S) : P : (P) : X = good hand with spades (2nd suit). 2NT = takeout (always 5H).