"fairy chess" meaning in English

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          "ref": "2005, Gary Westfahl, The Greenwood encyclopedia of science fiction and fantasy: themes, works, and wonders, Volume 1, page 113:",
          "text": "Chess with alternative rules is called fairy chess; a notable science fiction example is the 3-D game played in episodes of Star Trek.",
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        "A chess variant: chess with unusual rules or pieces."
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        "Synonym of fairy problem: an unusual chess problem."
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      "ipa": "/ˈfɛriˌtʃɛs/",
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  "word": "fairy chess"
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        "Synonym of fairy problem: an unusual chess problem."
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