{
  "schema_version": "1.0",
  "generator": {
    "name": "PlayChessOnline Position Review Generator",
    "version": "1.0.0",
    "generated_at_utc": "2026-08-31T07:04:47.231518+00:00",
    "runtime_seconds": 9.482569,
    "python_version": "3.12.1",
    "platform": "Windows-10-10.0.19045-SP0"
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  "review": {
    "slug": "luchtmeijer-garner-norths",
    "title": "Luchtmeijer vs Garner: Check the Recapture",
    "source": {
      "label": "Norths Chess Club Seniors, position contributed by Steve Garner",
      "url": "https://www.northsydneychess.org/seniors",
      "provenance": "Steve Garner supplied the exact FEN after 18.Bd3 and the legal continuation 18...Ba3 19.Rc2 Nxd2 20.Rxd2 from his game as Black against Ton Luchtmeijer. The public club page provides event context, not the game score. The contribution dates the game 11 August 2026; the public schedule ends 4 August, so the exact date is not independently confirmed. No full score or result was supplied."
    }
  },
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    "stockfish_hash_mb": 256,
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      "author": "the Stockfish developers (see AUTHORS file)",
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                "e4b1"
              ],
              "san": "19. Bxe4 Bxc1 20. Bxh7+ Kxh7 21. Rxc1 Bb5 22. Ng3 Bd3 23. Bd4 Nd7 24. Ndf1 Nf8 25. Ne3 Ne6 26. Rd1 Be4 27. Ne2 Nxd4 28. Rxd4 b5 29. h4 Rc6 30. Kh2 Ra6 31. Rd2 Bb1"
            },
            "nodes": 250054,
            "depth": 18,
            "seldepth": 28
          }
        ]
      }
    },
    {
      "id": "exchange-19",
      "label": "Black to move after 19.Rc2",
      "fen": "2r1r1k1/pp1b1ppp/5n2/3p4/4n3/bPPBB2P/P1RNNPP1/4R1K1 b - - 14 19",
      "side_to_move": "black",
      "legal_move_count": 47,
      "played_move": {
        "uci": "e4d2",
        "san": "Nxd2"
      },
      "model_consensus": {
        "distinct_top_moves": 1,
        "most_selected_move": {
          "uci": "e4d2",
          "san": "Nxd2"
        },
        "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": 1,
        "passes": false
      },
      "models": [
        {
          "key": "v6_active",
          "label": "V6 Active",
          "intended_profile": "active, initiative-seeking",
          "top_move": {
            "uci": "e4d2",
            "san": "Nxd2",
            "hybrid_score_cp": 220.338115
          },
          "top_three": [
            {
              "uci": "e4d2",
              "san": "Nxd2",
              "hybrid_score_cp": 220.338115
            },
            {
              "uci": "d7h3",
              "san": "Bxh3",
              "hybrid_score_cp": 62.006805
            },
            {
              "uci": "e4f2",
              "san": "Nxf2",
              "hybrid_score_cp": 61.917046
            }
          ]
        },
        {
          "key": "v8_sharp",
          "label": "V8 Sharp",
          "intended_profile": "sharp club-player profile on curated data",
          "top_move": {
            "uci": "e4d2",
            "san": "Nxd2",
            "hybrid_score_cp": 219.217448
          },
          "top_three": [
            {
              "uci": "e4d2",
              "san": "Nxd2",
              "hybrid_score_cp": 219.217448
            },
            {
              "uci": "c8c3",
              "san": "Rxc3",
              "hybrid_score_cp": 61.121907
            },
            {
              "uci": "e4f2",
              "san": "Nxf2",
              "hybrid_score_cp": 61.09243
            }
          ]
        },
        {
          "key": "v9_positional",
          "label": "V9 Positional",
          "intended_profile": "calm positional pressure",
          "top_move": {
            "uci": "e4d2",
            "san": "Nxd2",
            "hybrid_score_cp": 218.452032
          },
          "top_three": [
            {
              "uci": "e4d2",
              "san": "Nxd2",
              "hybrid_score_cp": 218.452032
            },
            {
              "uci": "e4f2",
              "san": "Nxf2",
              "hybrid_score_cp": 61.320464
            },
            {
              "uci": "d7h3",
              "san": "Bxh3",
              "hybrid_score_cp": 61.296931
            }
          ]
        },
        {
          "key": "v15_endgame",
          "label": "V15 Endgame",
          "intended_profile": "endgame-focused distilled evaluator",
          "top_move": {
            "uci": "e4d2",
            "san": "Nxd2",
            "hybrid_score_cp": 220.925037
          },
          "top_three": [
            {
              "uci": "e4d2",
              "san": "Nxd2",
              "hybrid_score_cp": 220.925037
            },
            {
              "uci": "e4f2",
              "san": "Nxf2",
              "hybrid_score_cp": 68.277277
            },
            {
              "uci": "c8c3",
              "san": "Rxc3",
              "hybrid_score_cp": 68.189571
            }
          ]
        },
        {
          "key": "v17_file_pressure",
          "label": "V17 File Pressure",
          "intended_profile": "open-file and rook-pressure weighting",
          "top_move": {
            "uci": "e4d2",
            "san": "Nxd2",
            "hybrid_score_cp": 220.743547
          },
          "top_three": [
            {
              "uci": "e4d2",
              "san": "Nxd2",
              "hybrid_score_cp": 220.743547
            },
            {
              "uci": "e4f2",
              "san": "Nxf2",
              "hybrid_score_cp": 62.090989
            },
            {
              "uci": "d7h3",
              "san": "Bxh3",
              "hybrid_score_cp": 61.580408
            }
          ]
        },
        {
          "key": "v18_defensive",
          "label": "V18 Defensive",
          "intended_profile": "defensive tension and counterpunch weighting",
          "top_move": {
            "uci": "e4d2",
            "san": "Nxd2",
            "hybrid_score_cp": 224.082169
          },
          "top_three": [
            {
              "uci": "e4d2",
              "san": "Nxd2",
              "hybrid_score_cp": 224.082169
            },
            {
              "uci": "d7h3",
              "san": "Bxh3",
              "hybrid_score_cp": 62.834989
            },
            {
              "uci": "c8c3",
              "san": "Rxc3",
              "hybrid_score_cp": 62.605921
            }
          ]
        }
      ],
      "stockfish": {
        "best_move": {
          "uci": "e4c5",
          "san": "Nc5"
        },
        "best_score": {
          "centipawns": 55,
          "is_mate": false,
          "mate_in": null,
          "comparison_cp": 55
        },
        "best_pv": {
          "uci": [
            "e4c5",
            "e3c5",
            "a3c5",
            "d2f3",
            "g7g6",
            "g1f1",
            "a7a6",
            "f3d4",
            "c5d6",
            "e2g3",
            "d6e5",
            "e1e3",
            "h7h5",
            "g3e2",
            "g8g7",
            "d4f3",
            "e5c7",
            "e3e8",
            "d7e8",
            "c2d2"
          ],
          "san": "19...Nc5 20. Bxc5 Bxc5 21. Nf3 g6 22. Kf1 a6 23. Nfd4 Bd6 24. Ng3 Be5 25. Re3 h5 26. Nge2 Kg7 27. Nf3 Bc7 28. Rxe8 Bxe8 29. Rd2"
        },
        "nodes": 250342,
        "depth": 19,
        "seldepth": 25,
        "verified_choices": [
          {
            "move": {
              "uci": "e4d2",
              "san": "Nxd2"
            },
            "is_played_move": true,
            "is_engine_best_move": false,
            "selected_by_models": [
              "V15 Endgame",
              "V17 File Pressure",
              "V18 Defensive",
              "V6 Active",
              "V8 Sharp",
              "V9 Positional"
            ],
            "score": {
              "centipawns": -39,
              "is_mate": false,
              "mate_in": null,
              "comparison_cp": -39
            },
            "loss_cp": 94,
            "within_100cp": true,
            "within_200cp": true,
            "pv": {
              "uci": [
                "e4d2",
                "c2d2",
                "a3f8",
                "e3d4",
                "a7a6",
                "d4f6",
                "g7f6",
                "g1f1",
                "f8d6",
                "d3b1",
                "d7e6",
                "d2d3",
                "h7h5",
                "e1d1",
                "d6e5",
                "d3e3",
                "h5h4",
                "f2f4",
                "e5b8",
                "f4f5",
                "e6d7",
                "e3e8",
                "c8e8",
                "d1d5"
              ],
              "san": "19...Nxd2 20. Rxd2 Bf8 21. Bd4 a6 22. Bxf6 gxf6 23. Kf1 Bd6 24. Bb1 Be6 25. Rd3 h5 26. Red1 Be5 27. Re3 h4 28. f4 Bb8 29. f5 Bd7 30. Rxe8+ Rxe8 31. Rxd5"
            },
            "nodes": 250079,
            "depth": 16,
            "seldepth": 27
          }
        ]
      }
    },
    {
      "id": "recapture-20",
      "label": "White to move after 19...Nxd2",
      "fen": "2r1r1k1/pp1b1ppp/5n2/3p4/8/bPPBB2P/P1RnNPP1/4R1K1 w - - 0 20",
      "side_to_move": "white",
      "legal_move_count": 36,
      "played_move": {
        "uci": "c2d2",
        "san": "Rxd2"
      },
      "model_consensus": {
        "distinct_top_moves": 2,
        "most_selected_move": {
          "uci": "c2d2",
          "san": "Rxd2"
        },
        "most_selected_count": 5
      },
      "public_choice_gate": {
        "required_distinct_safe_model_moves": 3,
        "safety_threshold_cp": 100,
        "observed_distinct_model_moves": 2,
        "safe_distinct_model_moves": 2,
        "passes": false
      },
      "models": [
        {
          "key": "v6_active",
          "label": "V6 Active",
          "intended_profile": "active, initiative-seeking",
          "top_move": {
            "uci": "c2d2",
            "san": "Rxd2",
            "hybrid_score_cp": 10.156823
          },
          "top_three": [
            {
              "uci": "c2d2",
              "san": "Rxd2",
              "hybrid_score_cp": 10.156823
            },
            {
              "uci": "e3d2",
              "san": "Bxd2",
              "hybrid_score_cp": 9.940933
            },
            {
              "uci": "d3h7",
              "san": "Bxh7+",
              "hybrid_score_cp": -148.700415
            }
          ]
        },
        {
          "key": "v8_sharp",
          "label": "V8 Sharp",
          "intended_profile": "sharp club-player profile on curated data",
          "top_move": {
            "uci": "c2d2",
            "san": "Rxd2",
            "hybrid_score_cp": 11.543079
          },
          "top_three": [
            {
              "uci": "c2d2",
              "san": "Rxd2",
              "hybrid_score_cp": 11.543079
            },
            {
              "uci": "e3d2",
              "san": "Bxd2",
              "hybrid_score_cp": 11.338816
            },
            {
              "uci": "d3h7",
              "san": "Bxh7+",
              "hybrid_score_cp": -147.479591
            }
          ]
        },
        {
          "key": "v9_positional",
          "label": "V9 Positional",
          "intended_profile": "calm positional pressure",
          "top_move": {
            "uci": "c2d2",
            "san": "Rxd2",
            "hybrid_score_cp": 10.752957
          },
          "top_three": [
            {
              "uci": "c2d2",
              "san": "Rxd2",
              "hybrid_score_cp": 10.752957
            },
            {
              "uci": "e3d2",
              "san": "Bxd2",
              "hybrid_score_cp": 10.505384
            },
            {
              "uci": "d3h7",
              "san": "Bxh7+",
              "hybrid_score_cp": -147.46319
            }
          ]
        },
        {
          "key": "v15_endgame",
          "label": "V15 Endgame",
          "intended_profile": "endgame-focused distilled evaluator",
          "top_move": {
            "uci": "e3d2",
            "san": "Bxd2",
            "hybrid_score_cp": 1.279544
          },
          "top_three": [
            {
              "uci": "e3d2",
              "san": "Bxd2",
              "hybrid_score_cp": 1.279544
            },
            {
              "uci": "c2d2",
              "san": "Rxd2",
              "hybrid_score_cp": 1.26855
            },
            {
              "uci": "d3h7",
              "san": "Bxh7+",
              "hybrid_score_cp": -151.535112
            }
          ]
        },
        {
          "key": "v17_file_pressure",
          "label": "V17 File Pressure",
          "intended_profile": "open-file and rook-pressure weighting",
          "top_move": {
            "uci": "c2d2",
            "san": "Rxd2",
            "hybrid_score_cp": 9.85424
          },
          "top_three": [
            {
              "uci": "c2d2",
              "san": "Rxd2",
              "hybrid_score_cp": 9.85424
            },
            {
              "uci": "e3d2",
              "san": "Bxd2",
              "hybrid_score_cp": 9.671782
            },
            {
              "uci": "d3h7",
              "san": "Bxh7+",
              "hybrid_score_cp": -148.775507
            }
          ]
        },
        {
          "key": "v18_defensive",
          "label": "V18 Defensive",
          "intended_profile": "defensive tension and counterpunch weighting",
          "top_move": {
            "uci": "c2d2",
            "san": "Rxd2",
            "hybrid_score_cp": 9.394115
          },
          "top_three": [
            {
              "uci": "c2d2",
              "san": "Rxd2",
              "hybrid_score_cp": 9.394115
            },
            {
              "uci": "e3d2",
              "san": "Bxd2",
              "hybrid_score_cp": 9.167967
            },
            {
              "uci": "d3h7",
              "san": "Bxh7+",
              "hybrid_score_cp": -150.855338
            }
          ]
        }
      ],
      "stockfish": {
        "best_move": {
          "uci": "c2d2",
          "san": "Rxd2"
        },
        "best_score": {
          "centipawns": 33,
          "is_mate": false,
          "mate_in": null,
          "comparison_cp": 33
        },
        "best_pv": {
          "uci": [
            "c2d2",
            "a3d6",
            "e3a7",
            "c8c3",
            "a7d4",
            "c3c8",
            "d4f6",
            "g7f6",
            "e1d1",
            "g8g7",
            "g1f1",
            "d6b4",
            "d2b2",
            "b4d6",
            "a2a4",
            "d6e5",
            "b2d2"
          ],
          "san": "20. Rxd2 Bd6 21. Bxa7 Rxc3 22. Bd4 Rcc8 23. Bxf6 gxf6 24. Red1 Kg7 25. Kf1 Bb4 26. Rb2 Bd6 27. a4 Be5 28. Rbd2"
        },
        "nodes": 250537,
        "depth": 16,
        "seldepth": 26,
        "verified_choices": [
          {
            "move": {
              "uci": "c2d2",
              "san": "Rxd2"
            },
            "is_played_move": true,
            "is_engine_best_move": true,
            "selected_by_models": [
              "V17 File Pressure",
              "V18 Defensive",
              "V6 Active",
              "V8 Sharp",
              "V9 Positional"
            ],
            "score": {
              "centipawns": 31,
              "is_mate": false,
              "mate_in": null,
              "comparison_cp": 31
            },
            "loss_cp": 0,
            "within_100cp": true,
            "within_200cp": true,
            "pv": {
              "uci": [
                "c2d2"
              ],
              "san": "20. Rxd2"
            },
            "nodes": 250554,
            "depth": 15,
            "seldepth": 28
          },
          {
            "move": {
              "uci": "e3d2",
              "san": "Bxd2"
            },
            "is_played_move": false,
            "is_engine_best_move": false,
            "selected_by_models": [
              "V15 Endgame"
            ],
            "score": {
              "centipawns": 16,
              "is_mate": false,
              "mate_in": null,
              "comparison_cp": 16
            },
            "loss_cp": 17,
            "within_100cp": true,
            "within_200cp": true,
            "pv": {
              "uci": [
                "e3d2",
                "f6e4"
              ],
              "san": "20. Bxd2 Ne4"
            },
            "nodes": 250062,
            "depth": 15,
            "seldepth": 24
          }
        ]
      }
    }
  ],
  "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."
  ]
}