"ultrabullet chess" meaning in English

{
  "etymology_templates": [
    {
      "args": {
        "1": "en",
        "2": "ultra-",
        "3": "bullet chess"
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      "expansion": "ultra- + bullet chess",
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  ],
  "etymology_text": "ultra- + bullet chess",
  "head_templates": [
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      "expansion": "ultrabullet chess (uncountable)",
      "name": "en-noun"
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  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
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        {
          "word": "ultrabullet"
        }
      ],
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          "source": "w"
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          "name": "English terms prefixed with ultra-",
          "parents": [],
          "source": "w"
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        {
          "kind": "topical",
          "langcode": "en",
          "name": "Chess",
          "orig": "en:Chess",
          "parents": [
            "Board games",
            "Tabletop games",
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          "source": "w"
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        {
          "kind": "topical",
          "langcode": "en",
          "name": "Internet",
          "orig": "en:Internet",
          "parents": [
            "Computing",
            "Networking",
            "Technology",
            "All topics",
            "Fundamental"
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          "source": "w"
        }
      ],
      "glosses": [
        "Alternative form of ultrabullet."
      ],
      "id": "en-ultrabullet_chess-en-noun-JuyqSFl5",
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          "Internet",
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        ],
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      ],
      "raw_glosses": [
        "(chess, Internet, rare) Alternative form of ultrabullet."
      ],
      "tags": [
        "Internet",
        "alt-of",
        "alternative",
        "rare",
        "uncountable"
      ],
      "topics": [
        "board-games",
        "chess",
        "games"
      ]
    }
  ],
  "word": "ultrabullet chess"
}

{
  "etymology_templates": [
    {
      "args": {
        "1": "en",
        "2": "ultra-",
        "3": "bullet chess"
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      "expansion": "ultra- + bullet chess",
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  ],
  "etymology_text": "ultra- + bullet chess",
  "head_templates": [
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      "args": {
        "1": "-"
      },
      "expansion": "ultrabullet chess (uncountable)",
      "name": "en-noun"
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  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "alt_of": [
        {
          "word": "ultrabullet"
        }
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        "en:Chess",
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      ],
      "glosses": [
        "Alternative form of ultrabullet."
      ],
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        ],
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      "raw_glosses": [
        "(chess, Internet, rare) Alternative form of ultrabullet."
      ],
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        "alt-of",
        "alternative",
        "rare",
        "uncountable"
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      "topics": [
        "board-games",
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        "games"
      ]
    }
  ],
  "word": "ultrabullet chess"
}