Check back stayman -- CBS

Responders uses 2 as artificial request , if he wants more information from opener after 1x 1y 1NT.

CBS is better than NMF (NewMinorForcing) imo.

I'm playing CBS like M. Bergen suggests in his book "Better bidding with Bergen VOL 1 page 163ff"
Not like BrideGuys explain.
Here's Marty Bergen's opinion: "Every time I hear the opponents bid 1 - 1/1 - 1NT - 2
(New Minor Forcing) - 2NT, I have to laugh at the 'nature' of bridge players. How can it be
correct to use 2 as 'Stayman' (forcing opener to bid 2NT when he has no major (suit bid) when
2 is available? This potential loss of bidding space makes no sense at all. Whereas after 2
checkback, opener's 'negative' is an economical 2, as in Stayman, preserving the opportunity for
responder to rebid two-of-a-major."
The ideas I refer here are from Marty Bergen (Better bidding with Bergen Vol I, page 164 ff.).
I filled in a FD-convention-card containing CBS only to download and merge into your own CC if applicable.
The only forcing bid is the 2 checkback-bid.
All strong auctions begin with 2 .
However not every auction beginning with 2 is strong.

Openers answers to 2 are:
2 no 3-card support; no 4 cards in the other major.
2 major shows 3-card-support or 4 cards in the new major.
Show your 3-card support, if you have both.

A jump to 3 is a signoff.

All other jumps, reverses or 2NT are invitational.

All other bids (rebid of suit, raise of openers suit and rebid in lower ranking suit) are weak and non invitational.

After responder bid checkback (1x 1y 1NT 2 2z)
If responders next bid is at the 3-level, it is game-forcing.
Exception: When responder just obtained a major-suit-response from opener and raises the suit to the 3-level (reraise), this is invitational.

2NT by responder is invitational

2 of responders original major is fairly weak and only slightly invitational.