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Lebensohl is a contract bridge convention used by responder after an opponent's overcall of a one notrump (1NT) opening bid in order to compete further in the auction without necessarily committing the partnership to game. Lebensohl can also be used after opponents' weak-two bids and in responding to a reverse by partner. ==Origins and spelling== The origins of the convention are unknown and various views about its spelling have ensued. The Official Encyclopedia of Bridge (OEB) first listed LEBENSOHL in its third edition published in 1976 and attributed its design to George Boehm; the fourth OEB edition, under the entry LEBENSOLD, states that George Boehm first described the convention and that Boehm had wrongly attributed it to Ken Lebensold; the fifth and sixth editions state likewise but under LEBENSOHL. In the seventh edition and for the first time, the OEB notes "Uniquely amongst bridge conventions, it should arguably be spelled with a lowercase first letter – lebensohl." In another account,〔 Lebensohl is said to have been observed in use in the late 1960s and... The 1970 Bridge World article by Boehm was the first published on Lebensohl〔The Bridge World website: (The lebensohl Mystery )〕 but he does not attribute the convention to Ken Lebensold in it. However, Boehm does recount that in preparation for a competition in New York in late 1969, his convention card had the entry "Lebensohl when you overcall our notrump opening". Ken Lebensold was also a competitor at the event and upon reviewing Boehm's convention card, "disowned the convention". Boehm goes on to state that therefore he and his playing partner (son, Augie) "have decided to designate it "lebensohl" and to continue to use it without fee or license".〔 Nothwithstanding Boehm naming and spelling it uncapitalized, most bridge literature refers to the convention as Lebensohl with occasional post-1970 use of Lebensold going uncorrected. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Lebensohl」の詳細全文を読む スポンサード リンク
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