{
  "apiVersion": "v1",
  "methodology": "https://sourcescore.org/methodology/",
  "canonical": "https://sourcescore.org/claims/0318700337f0906d/",
  "claim": {
    "vertical": "ai-ml",
    "subject": "AlphaGo",
    "predicate": "defeated",
    "object": "Lee Sedol 4-1 in March 2016",
    "confidence": 1,
    "sources": [
      {
        "url": "https://www.nature.com/articles/nature16961",
        "title": "Mastering the game of Go with deep neural networks and tree search",
        "publisher": "Nature (Silver et al. / DeepMind)",
        "publishedDate": "2016-01-27",
        "accessedDate": "2026-05-16",
        "type": "peer-reviewed",
        "excerpt": "Here we introduce a new approach to computer Go that uses 'value networks' to evaluate board positions and 'policy networks' to select moves. These deep neural networks are trained by a novel combination of supervised learning from human expert games, and reinforcement learning from games of self-play."
      },
      {
        "url": "https://deepmind.google/research/breakthroughs/alphago/",
        "title": "AlphaGo — DeepMind",
        "publisher": "Google DeepMind",
        "publishedDate": "2016-03-15",
        "accessedDate": "2026-05-16",
        "type": "official-blog",
        "excerpt": "In a landmark moment for artificial intelligence, AlphaGo took on 18-time world champion Lee Sedol in a five-game challenge match in Seoul. AlphaGo won the series 4-1."
      }
    ],
    "publishedAt": "2026-05-16T00:00:00Z",
    "lastVerified": "2026-05-16",
    "methodologyVersion": "veritas-v0.1",
    "tags": [
      "alphago",
      "deepmind",
      "reinforcement-learning",
      "lee-sedol",
      "foundational",
      "2016",
      "defeated"
    ],
    "id": "0318700337f0906d",
    "statement": "AlphaGo defeated: Lee Sedol 4-1 in March 2016."
  },
  "signature": {
    "algorithm": "HMAC-SHA256",
    "signedBy": "did:web:sourcescore.org",
    "signedAt": "2026-05-17T00:00:00.000Z",
    "signature": "ecddfd0a2f23403ca14071b53ffc105c68344e016b0fcd34d2ca1407a2b29676"
  },
  "citedAs": "AlphaGo defeated: Lee Sedol 4-1 in March 2016. — SourceScore Claim 0318700337f0906d (verified 2026-05-16, signed ecddfd0a…). https://sourcescore.org/claims/0318700337f0906d/"
}