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Russian roulette is a lethal game of chance in which a player places a single round in a revolver, spins the cylinder, places the muzzle against their head, and pulls the trigger. "Russian" refers to the supposed country of origin, and roulette to the element of risk-taking and the spinning of the revolver's cylinder being reminiscent of spinning a roulette wheel. Because only one chamber is loaded, the player has a one in ''x'' chance of hitting the loaded chamber, where ''x'' is the number of chambers in the cylinder. So, for instance, for a revolver that holds six rounds, the chance is one in six. That assumes that each chamber is equally likely to come to rest in the "correct" position. However due to gravity, in a properly maintained weapon with a single round inside the cylinder, the full chamber, which weighs more than the empty chambers, will usually end up near the bottom of the cylinder when its axis is not vertical, altering the odds in favor of the player. This only applies to swing-out cylinder type revolvers, and only if the cylinder is spun outside of the revolver and allowed to come to a complete stop before locked back in. ==History== In writing, the term "Russian roulette" was first used in an eponymous 1937 short story by Georges Surdez: :'Did you ever hear of Russian Roulette?' ... With the Russian army in Romania, around 1917, some officer would suddenly pull out his revolver, remove a cartridge from the cylinder, spin the cylinder, snap it back in place, put it to his head and pull the trigger.〔Georges Surdez, "Russian Roulette," ''Collier's Illustrated Weekly'' 30 Jan. 16, 1937; "Russian roulette ''n.''", ''Oxford English Dictionary''.〕 It is claimed that this practice was widely known in Russia in the early 19th century. However, there is only one written source before the 20th century: in Mikhail Lermontov's 1840 "The Fatalist", one of five novellas comprising his ''A Hero of Our Time'', a minor character survives a version of Russian roulette. 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「Russian roulette」の詳細全文を読む スポンサード リンク
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