"minor piece" meaning in English

{
  "forms": [
    {
      "form": "minor pieces",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "minor piece (plural minor pieces)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "English entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w"
        },
        {
          "kind": "topical",
          "langcode": "en",
          "name": "Chess",
          "orig": "en:Chess",
          "parents": [
            "Board games",
            "Tabletop games",
            "Games",
            "Recreation",
            "Human activity",
            "Human behaviour",
            "Human",
            "All topics",
            "Fundamental"
          ],
          "source": "w"
        }
      ],
      "glosses": [
        "A bishop or a knight."
      ],
      "id": "en-minor_piece-en-noun--4A5nxsO",
      "links": [
        [
          "chess",
          "chess"
        ],
        [
          "bishop",
          "bishop"
        ],
        [
          "knight",
          "knight"
        ]
      ],
      "raw_glosses": [
        "(chess) A bishop or a knight."
      ],
      "related": [
        {
          "word": "major piece"
        }
      ],
      "topics": [
        "board-games",
        "chess",
        "games"
      ],
      "translations": [
        {
          "code": "fi",
          "lang": "Finnish",
          "sense": "A bishop or a knight",
          "word": "kevyt upseeri"
        },
        {
          "code": "fr",
          "lang": "French",
          "sense": "A bishop or a knight",
          "tags": [
            "feminine"
          ],
          "word": "pièce mineure"
        },
        {
          "code": "pl",
          "lang": "Polish",
          "sense": "A bishop or a knight",
          "tags": [
            "feminine"
          ],
          "word": "lekka figura"
        }
      ]
    }
  ],
  "word": "minor piece"
}

{
  "forms": [
    {
      "form": "minor pieces",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "minor piece (plural minor pieces)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "related": [
    {
      "word": "major piece"
    }
  ],
  "senses": [
    {
      "categories": [
        "English countable nouns",
        "English entries with incorrect language header",
        "English lemmas",
        "English multiword terms",
        "English nouns",
        "en:Chess"
      ],
      "glosses": [
        "A bishop or a knight."
      ],
      "links": [
        [
          "chess",
          "chess"
        ],
        [
          "bishop",
          "bishop"
        ],
        [
          "knight",
          "knight"
        ]
      ],
      "raw_glosses": [
        "(chess) A bishop or a knight."
      ],
      "topics": [
        "board-games",
        "chess",
        "games"
      ]
    }
  ],
  "translations": [
    {
      "code": "fi",
      "lang": "Finnish",
      "sense": "A bishop or a knight",
      "word": "kevyt upseeri"
    },
    {
      "code": "fr",
      "lang": "French",
      "sense": "A bishop or a knight",
      "tags": [
        "feminine"
      ],
      "word": "pièce mineure"
    },
    {
      "code": "pl",
      "lang": "Polish",
      "sense": "A bishop or a knight",
      "tags": [
        "feminine"
      ],
      "word": "lekka figura"
    }
  ],
  "word": "minor piece"
}