"discovered attack" meaning in English

{
  "forms": [
    {
      "form": "discovered attacks",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "discovered attack (plural discovered attacks)",
      "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": [
        "An attack revealed when one piece moves out of the way of another."
      ],
      "hyponyms": [
        {
          "word": "discovered check"
        }
      ],
      "id": "en-discovered_attack-en-noun-ryyWXPVH",
      "links": [
        [
          "chess",
          "chess"
        ],
        [
          "attack",
          "attack"
        ],
        [
          "piece",
          "piece"
        ]
      ],
      "raw_glosses": [
        "(chess) An attack revealed when one piece moves out of the way of another."
      ],
      "topics": [
        "board-games",
        "chess",
        "games"
      ]
    }
  ],
  "word": "discovered attack"
}

{
  "forms": [
    {
      "form": "discovered attacks",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "discovered attack (plural discovered attacks)",
      "name": "en-noun"
    }
  ],
  "hyponyms": [
    {
      "word": "discovered check"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        "English countable nouns",
        "English entries with incorrect language header",
        "English lemmas",
        "English multiword terms",
        "English nouns",
        "en:Chess"
      ],
      "glosses": [
        "An attack revealed when one piece moves out of the way of another."
      ],
      "links": [
        [
          "chess",
          "chess"
        ],
        [
          "attack",
          "attack"
        ],
        [
          "piece",
          "piece"
        ]
      ],
      "raw_glosses": [
        "(chess) An attack revealed when one piece moves out of the way of another."
      ],
      "topics": [
        "board-games",
        "chess",
        "games"
      ]
    }
  ],
  "word": "discovered attack"
}