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Landy
Landy, named after its inventor Alvin Landy〔Manley (2011), page 295〕 is the first of several conventional defenses created to compete against an opponent's one notrump (1NT) opening. Landy is a 2 overcall of the opponents' 1NT opening to show at least four cards in each of the major suits; all other bids are natural. Requirements for the overcall vary from partnership to partnership: some require 5-5, some 5-4, and yet others only 4-4 (provided the overall strength is sufficient). The partner can take a preference to either major or make a non-forcing bid of a suit; 2NT is used as a forcing query.
==Extended Landy==
An extension was proposed by Ira Rubin in 1947 using 2 as a takeout request after a response or rebid of 1NT after a suit opening. It implies more distribution and less strength than a double. It also applies in the passout seat.
Based on his initial inability to overcall the 1 opening directly, the bid of 2 by North shows five or more clubs and exactly four hearts. Similar uses were developed later by others.
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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