"self-play" meaning in English

{
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    {
      "args": {
        "1": "en",
        "2": "self",
        "3": "play"
      },
      "expansion": "self- + play",
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    }
  ],
  "etymology_text": "self- + play",
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      "expansion": "self-play (uncountable)",
      "name": "en-noun"
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  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
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          "name": "English terms prefixed with self-",
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        {
          "kind": "topical",
          "langcode": "en",
          "name": "Artificial intelligence",
          "orig": "en:Artificial intelligence",
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      "examples": [
        {
          "text": "Self-play was used by the AlphaZero program to improve its performance in the games of chess, shogi and go.",
          "type": "example"
        }
      ],
      "glosses": [
        "A technique for improving the performance of reinforcement learning agents by having them play against themselves."
      ],
      "id": "en-self-play-en-noun-2FnqjD9p",
      "links": [
        [
          "machine learning",
          "machine learning"
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      ],
      "qualifier": "machine learning",
      "raw_glosses": [
        "(machine learning) A technique for improving the performance of reinforcement learning agents by having them play against themselves."
      ],
      "tags": [
        "uncountable"
      ]
    }
  ],
  "word": "self-play"
}

{
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    {
      "args": {
        "1": "en",
        "2": "self",
        "3": "play"
      },
      "expansion": "self- + play",
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    }
  ],
  "etymology_text": "self- + play",
  "head_templates": [
    {
      "args": {
        "1": "-"
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      "expansion": "self-play (uncountable)",
      "name": "en-noun"
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  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
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        "English nouns",
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        "en:Artificial intelligence"
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      "examples": [
        {
          "text": "Self-play was used by the AlphaZero program to improve its performance in the games of chess, shogi and go.",
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        }
      ],
      "glosses": [
        "A technique for improving the performance of reinforcement learning agents by having them play against themselves."
      ],
      "links": [
        [
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      "qualifier": "machine learning",
      "raw_glosses": [
        "(machine learning) A technique for improving the performance of reinforcement learning agents by having them play against themselves."
      ],
      "tags": [
        "uncountable"
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    }
  ],
  "word": "self-play"
}