The opening bids are:
Pass = 0-7 or 17+. Responder bids 1C with 0-7 or 17+. Then opener with 0-7 bids 1D and with 17+ makes other bids fairly naturally.
1C = 13-16 and a suited hand. Then 1D asks and other bids fairly natural.
1D = 8-12 balanced. Then 1H asks and other bids to play or pre-emptive.
1H/1S = 8-12 with 5 or more cards
1NT = 13-16 balanced
2C/2D = 8-12 at least 5 in minor
2H/2S =4441
After opener has passed and responder has 8-16, 1D and 1NT are unchanged and 2 bids extend to 8-16.
Does anybody know of a similar recognised forcing pass system?
My friend remembers in the 80's at a tournament in London he showed the system to a Polish player who became quite excited exclaiming " Oh it is an ambiguous forcing pass"

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