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Gerber convention
Gerber is a contract bridge convention devised by Dr. William Konigsberger and Win Nye from Switzerland〔(Gerber convention at the BridgeGuys website )〕 who published it in 1936; John Gerber of Texas introduced it to North America in 1938 where it was named after him.〔Downey and Pomer (2005), p. 153.〕〔Francis et al (2001), p. 171. The Encyclopedia states that the convention was "invented" by John Gerber in 1938 and "devised" independently by Konigsberger and Nye and published by them in 1936.〕 It is similar to Blackwood but uses 4 instead of 4NT as an "asking bid" to inquire about the number of aces held by partner; a further asking bid may follow to inquire about the number of kings held.
Gerber is used primarily after notrump openings, responses and rebids, making it a complement to Blackwood rather than a replacement. Some club players also use it after suit bidding, but most experts do not recommend this.
==Purpose==
Because bidding and making a slam or grand slam contract in bridge gains significant bonus scoring points, partnerships will strive to bid them whenever their combined card assets are deemed sufficient. Knowing the number of aces and kings jointly held is usually crucial to this decision and Gerber is one of several bridge conventions used to ascertain the necessary information.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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