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A no-win situation, also called a “lose-lose situation”, is one where a person has choices, but no choice leads to a net gain. For example, if an executioner offers the condemned the choice of dying by being hanged, shot, or poisoned, since all choices lead to death, the condemned is in a no-win situation. This bleak situation gives the chooser little room: whatever choice is made, the person making it will lose their life. Less drastic situations might also be considered no-win situations: if one has a choice for lunch between a ham sandwich and a roast beef sandwich, but is a vegetarian or has a wheat allergy, that might be considered a no-win situation. ==In game theory== In game theory, a "no-win" situation is one in which no player benefits from any outcome. This may be because of any or all of the following: * Unavoidable or unforeseeable circumstances causing the situation to change after decisions have been made. This is common in Text adventures. * Zugzwang, as in chess, when any move a player chooses makes him worse off than before * A situation in which the player has to accomplish two mutually dependent tasks each of which must be completed before the other or that are mutually exclusive (a Catch-22)〔(First-Year Reading tackles Catch-22 ) 〕 * Ignorance of other players' actions, meaning the best decision for all differs from that for any one player (as in the Prisoner's Dilemma). 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「No-win situation」の詳細全文を読む スポンサード リンク
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