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2NT Opening light preempt on minors or sound preempt on majors: Krzysztof Martens, in Wladyslaw Izdebski "Nowoczesny Brydz - Konwencje" ("Modern Bridge - Conventions") Wydawnictwa Polskiego Zwiazku Brydza Sportowego (PZBS) (Publishing House of Polish Union of Sport Bridge), Warszawa 1996, ISBN 83-903323-3-7:
"Almost Acol" - minor opening followed by bidding 2 level major, 2NT or 3 in minor: Grzegorz Gardynik, in "Swiat Brydza" ("Bridge World") montlhy published by PZBS, Wladyslaw Izdebski, Editor, ISSN-0867-7743:
"1NT - Ultimate Preempt" - bidding after weak NT by Tony Melucci, 1995 King of Bridge (best high school senior in the US) http://www.crl.com/~tonym/1NT.html :
Bidding system design: Henryk Mach
"henryk_m" on OKBridge , e-mail: henryk654@aol.com