{
  "schema_version": "1.0",
  "generator": {
    "name": "PlayChessOnline Position Review Generator",
    "version": "1.0.0",
    "generated_at_utc": "2026-07-29T12:25:59.001512+00:00",
    "runtime_seconds": 3.630955,
    "python_version": "3.12.1",
    "platform": "Windows-10-10.0.19045-SP0"
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  "review": {
    "slug": "timman-short-1990",
    "title": "Jan Timman vs Nigel Short — three critical choices",
    "source": {
      "label": "ChessBox game page",
      "url": "https://www.chessbox.in/chessgame/timman-jan-h-short-nigel-d-17/"
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                "e6e7"
              ],
              "san": "25. Qxg4 fxg4 26. h4 gxh3 27. Nxh3 Qxa2 28. Nf4 Qb1+ 29. Kg2 Qe4+ 30. Kg1 Qe5 31. Nh5 Qxh5 32. e7"
            },
            "nodes": 250602,
            "depth": 14,
            "seldepth": 26
          }
        ]
      }
    },
    {
      "id": "choice-27",
      "label": "White to move on move 27",
      "fen": "4r2k/2pRP1pp/2p5/p4pN1/2Q3n1/q5P1/P3PP1P/6K1 w - - 3 27",
      "side_to_move": "white",
      "legal_move_count": 42,
      "played_move": {
        "uci": "g5f7",
        "san": "Nf7+"
      },
      "model_consensus": {
        "distinct_top_moves": 1,
        "most_selected_move": {
          "uci": "c4g4",
          "san": "Qxg4"
        },
        "most_selected_count": 6
      },
      "public_choice_gate": {
        "required_distinct_safe_model_moves": 3,
        "safety_threshold_cp": 100,
        "observed_distinct_model_moves": 1,
        "safe_distinct_model_moves": 0,
        "passes": false
      },
      "models": [
        {
          "key": "v6_active",
          "label": "V6 Active",
          "intended_profile": "active, initiative-seeking",
          "top_move": {
            "uci": "c4g4",
            "san": "Qxg4",
            "hybrid_score_cp": 221.123209
          },
          "top_three": [
            {
              "uci": "c4g4",
              "san": "Qxg4",
              "hybrid_score_cp": 221.123209
            },
            {
              "uci": "d7c7",
              "san": "Rxc7",
              "hybrid_score_cp": 75.315746
            },
            {
              "uci": "c4c6",
              "san": "Qxc6",
              "hybrid_score_cp": 74.951267
            }
          ]
        },
        {
          "key": "v8_sharp",
          "label": "V8 Sharp",
          "intended_profile": "sharp club-player profile on curated data",
          "top_move": {
            "uci": "c4g4",
            "san": "Qxg4",
            "hybrid_score_cp": 224.970042
          },
          "top_three": [
            {
              "uci": "c4g4",
              "san": "Qxg4",
              "hybrid_score_cp": 224.970042
            },
            {
              "uci": "g5h7",
              "san": "Nxh7",
              "hybrid_score_cp": 77.59899
            },
            {
              "uci": "d7c7",
              "san": "Rxc7",
              "hybrid_score_cp": 77.515001
            }
          ]
        },
        {
          "key": "v9_positional",
          "label": "V9 Positional",
          "intended_profile": "calm positional pressure",
          "top_move": {
            "uci": "c4g4",
            "san": "Qxg4",
            "hybrid_score_cp": 224.169601
          },
          "top_three": [
            {
              "uci": "c4g4",
              "san": "Qxg4",
              "hybrid_score_cp": 224.169601
            },
            {
              "uci": "c4c6",
              "san": "Qxc6",
              "hybrid_score_cp": 76.085096
            },
            {
              "uci": "d7c7",
              "san": "Rxc7",
              "hybrid_score_cp": 75.91614
            }
          ]
        },
        {
          "key": "v15_endgame",
          "label": "V15 Endgame",
          "intended_profile": "endgame-focused distilled evaluator",
          "top_move": {
            "uci": "c4g4",
            "san": "Qxg4",
            "hybrid_score_cp": 228.356944
          },
          "top_three": [
            {
              "uci": "c4g4",
              "san": "Qxg4",
              "hybrid_score_cp": 228.356944
            },
            {
              "uci": "d7c7",
              "san": "Rxc7",
              "hybrid_score_cp": 72.046362
            },
            {
              "uci": "c4c6",
              "san": "Qxc6",
              "hybrid_score_cp": 71.98334
            }
          ]
        },
        {
          "key": "v17_file_pressure",
          "label": "V17 File Pressure",
          "intended_profile": "open-file and rook-pressure weighting",
          "top_move": {
            "uci": "c4g4",
            "san": "Qxg4",
            "hybrid_score_cp": 225.267543
          },
          "top_three": [
            {
              "uci": "c4g4",
              "san": "Qxg4",
              "hybrid_score_cp": 225.267543
            },
            {
              "uci": "d7c7",
              "san": "Rxc7",
              "hybrid_score_cp": 78.394649
            },
            {
              "uci": "c4c6",
              "san": "Qxc6",
              "hybrid_score_cp": 78.246393
            }
          ]
        },
        {
          "key": "v18_defensive",
          "label": "V18 Defensive",
          "intended_profile": "defensive tension and counterpunch weighting",
          "top_move": {
            "uci": "c4g4",
            "san": "Qxg4",
            "hybrid_score_cp": 221.929393
          },
          "top_three": [
            {
              "uci": "c4g4",
              "san": "Qxg4",
              "hybrid_score_cp": 221.929393
            },
            {
              "uci": "d7c7",
              "san": "Rxc7",
              "hybrid_score_cp": 77.864818
            },
            {
              "uci": "c4c6",
              "san": "Qxc6",
              "hybrid_score_cp": 77.448123
            }
          ]
        }
      ],
      "stockfish": {
        "best_move": {
          "uci": "g5f7",
          "san": "Nf7+"
        },
        "best_score": {
          "centipawns": null,
          "is_mate": true,
          "mate_in": 4,
          "comparison_cp": 99996
        },
        "best_pv": {
          "uci": [
            "g5f7",
            "h8g8",
            "f7h6",
            "g8h8",
            "c4g8",
            "e8g8",
            "h6f7"
          ],
          "san": "27. Nf7+ Kg8 28. Nh6+ Kh8 29. Qg8+ Rxg8 30. Nf7#"
        },
        "nodes": 250088,
        "depth": 44,
        "seldepth": 8,
        "verified_choices": [
          {
            "move": {
              "uci": "c4g4",
              "san": "Qxg4"
            },
            "is_played_move": false,
            "is_engine_best_move": false,
            "selected_by_models": [
              "V15 Endgame",
              "V17 File Pressure",
              "V18 Defensive",
              "V6 Active",
              "V8 Sharp",
              "V9 Positional"
            ],
            "score": {
              "centipawns": -476,
              "is_mate": false,
              "mate_in": null,
              "comparison_cp": -476
            },
            "loss_cp": 100472,
            "within_100cp": false,
            "within_200cp": false,
            "pv": {
              "uci": [
                "c4g4",
                "f5g4",
                "g5e4",
                "a3e7",
                "d7e7",
                "e8e7",
                "f2f3",
                "e7d7",
                "g1f2"
              ],
              "san": "27. Qxg4 fxg4 28. Ne4 Qxe7 29. Rxe7 Rxe7 30. f3 Rd7 31. Kf2"
            },
            "nodes": 250821,
            "depth": 14,
            "seldepth": 24
          },
          {
            "move": {
              "uci": "g5f7",
              "san": "Nf7+"
            },
            "is_played_move": true,
            "is_engine_best_move": true,
            "selected_by_models": [],
            "score": {
              "centipawns": null,
              "is_mate": true,
              "mate_in": 4,
              "comparison_cp": 99996
            },
            "loss_cp": 0,
            "within_100cp": true,
            "within_200cp": true,
            "pv": {
              "uci": [
                "g5f7",
                "h8g8",
                "f7h6",
                "g8h8",
                "c4g8",
                "e8g8",
                "h6f7"
              ],
              "san": "27. Nf7+ Kg8 28. Nh6+ Kh8 29. Qg8+ Rxg8 30. Nf7#"
            },
            "nodes": 250080,
            "depth": 146,
            "seldepth": 8
          }
        ]
      }
    }
  ],
  "limitations": [
    "The six neural checkpoints are scalar evaluators, not move-policy models or explanation models.",
    "Their 768 inputs encode piece placement only; side to move is applied after inference, while castling rights, en-passant state, repetition, move history, and clocks are not model inputs.",
    "Profile labels describe intended training or runtime behavior and do not prove human-like personality or internal understanding.",
    "Stockfish results use a fixed node budget and configuration and are a verification snapshot, not a claim of perfect play.",
    "Stockfish was required to use two search threads. Parallel search can produce small score, depth, node-count, or PV differences on a fresh rerun even when the configured node limit is unchanged.",
    "Centipawn loss uses a 100,000 cp comparison value for forced-mate scores; mate status and mate distance are also reported separately.",
    "The analysis does not measure Elo, playing strength, or clean unseen test accuracy.",
    "Any reader-facing move explanation must describe observable chess features; it must not be presented as the model's internal reasoning."
  ]
}