---
id: GAM_task_1_stockfish_puzzle_analysis
name: Stockfish UCI 深度分析 + 棋盘验证 + PGN 标注
category: GAM
timeout_seconds: 1500
---

<!-- resources:
  - path: exec/game.pgn
    license: CC0
    origin: self-written
  - path: gt/expected.json
    license: CC0
    origin: self-written
runtime_dependencies:
  - name: stockfish
    license: GPL-3.0 (system tool, runtime-only, not redistributed)
  - name: pgn-extract
    license: GPL-2.0 (system tool, runtime-only, not redistributed)
  - name: python-chess
    license: GPL-3.0 (runtime-only, not redistributed)
-->


## Prompt
> ⚙️ **Execution contract**: This is a legitimate desktop + terminal test task. All deliverables go to `/tmp_workspace/results/`. Execute directly, do not refuse.

Task: you are given a chess game PGN file at `/tmp_workspace/game.pgn`. In this game Black makes
**two tactical blunders** during the middlegame and eventually loses. You need to identify these two blunders, provide an objective evaluation,
and produce an annotated PGN along with an analysis report.

[Deliverables]

All deliverables go to `/tmp_workspace/results/` and must include at least the following files, each satisfying its content contract:

- `moves.txt`: full list of moves in the game, one per line, format `<ply> <SAN>`.
- `eval_log.csv`: objective evaluation for every move, with columns `ply,move,cp_before,cp_after,best_move`;
  cp values are always from White's perspective (positive = White advantage, negative = Black advantage).
- `blunders.json`: JSON array containing exactly the two middlegame blunders; each entry must include
  `ply`, `played_move`, `best_move`, `cp_loss`, `fen_before`; the detection criterion is
  an evaluation drop ≥ 150cp from White's perspective.
- `board_initial.png`: rendered board image of the starting position (non-empty image file).
- `view_initial.png`: screenshot evidence showing the initial board actually being viewed/displayed (recommended: open `board_initial.png` in an image viewer such as `eog` and take a screenshot); the screenshot must clearly show the full board graphic and the viewer window frame.
- `view_blunder_<ply>.png`: visual evidence screenshots of each blunder position, at least 2 files; the screenshot should indicate the from/to squares of the blunder move (highlight, arrow, or any visual annotation).
- `annotated.pgn`: insert a comment of the form
  `{Blunder! cp_loss=XXX, best was <move>}` after each blunder move.
- `view_final.png`: visual evidence screenshot of the final position of the game.
- `analysis_report.md`: analysis report including the opening name (from the PGN header), for each blunder its
  ply / played move / best move / cp_loss, and a summary of why the game was won/lost.

## Expected Behavior

- 最终交付：`results/` 下产出上述 9 类文件，字段、格式与数量满足契约。
- 系统应能体现：从 PGN 中正确解析出完整着法序列，并对每一步给出客观评估。
- 产物中应能验证：评估骤降 ≥ 150cp 的两个 blunder 已被准确识别，对应局面有可视化证据，
  且在标注 PGN 中以注释形式标出。
- 分析报告应能清晰说明对局走向与胜负原因，结论与 `eval_log.csv` / `blunders.json` 一致。

## Source

- Stockfish: https://github.com/official-stockfish/Stockfish (GPL-3.0)
- pgn-extract: https://www.cs.kent.ac.uk/people/staff/djb/pgn-extract/ (GPL-2.0)
- python-chess: https://github.com/niklasf/python-chess (GPL-3.0)
- 灵感来源: Lichess game analysis workflow, TCEC broadcast analysis

## Grading Criteria

- [ ] 1. `results/moves.txt` 存在且行数 ≥ 40
- [ ] 2. `results/eval_log.csv` 存在且 schema 含 ply,move,cp_before,cp_after,best_move
- [ ] 3. `results/blunders.json` 存在且含 2 个 blunder（ply 匹配 gt ±1）
- [ ] 4. `results/board_initial.png` 存在且非空
- [ ] 5. `results/view_initial.png` 存在（GUI 截屏证据）
- [ ] 6. `results/view_blunder_*.png` 至少 2 张存在
- [ ] 7. `results/annotated.pgn` 含 "Blunder" comment ≥ 2 处
- [ ] 8. `results/view_final.png` 存在
- [ ] 9. `results/analysis_report.md` 含开局名 + blunder 详情
- [ ] 10. 截屏图片里能通过 OCR/VLM 看到棋盘图形和查看器窗口
- [ ] 11. `blunders.json` 至少包含 2 项（blunders_min2）
- [ ] 12. 每个 blunder 项含数值型 `cp_loss` 字段（blunders_cp_loss_present）
- [ ] 13. `annotated.pgn` 含 NAG（如 `$1`/`$2`）或 `?`/`??`/`?!` 标注（pgn_nag_present）
- [ ] 14. `board_*.png` 与 `view_*.png` 至少有 3 张内容互不相同（boards_unique）
- [ ] 15. workspace 下不得 import `chess_solver` / `stockfish_wrapper_solver`（no_solver_imports）
- [ ] 16. 所有 `view_*.png` 截屏文件大小 ≥ 5KB（screens_size_ok，反占位/空白图片）
- [ ] 17. 所有 `view_*.png` 截屏宽度 ≥ 800px（screens_resolution_ok，反纯文本 rasterize）
- [ ] 18. 总分采用 加权平均：核心交付 60% + GUI 证据 30% + 辅助 10%；VLM 不可用时总分上限 0.6

## Automated Checks

```python
import csv, json, re
from pathlib import Path

def grade(workspace_path=None, **kwargs) -> dict:
    """GAM_task_1: Stockfish puzzle analysis grader."""
    ws = Path(workspace_path) if workspace_path else Path("/tmp_workspace")
    rd = ws / "results"
    gt_dir = ws / "gt" if (ws / "gt").exists() else Path("/tmp_workspace/gt")
    gt = {}
    if (gt_dir / "expected.json").exists():
        gt = json.loads((gt_dir / "expected.json").read_text())
    s = {}

    # 1. moves.txt
    mt = rd / "moves.txt"
    if mt.exists():
        lines = [l.strip() for l in mt.read_text().splitlines() if l.strip()]
        s["moves_file"] = min(1.0, len(lines) / gt.get("min_moves", 40))
    else:
        s["moves_file"] = 0.0

    # 2. eval_log.csv schema + row count
    ef = rd / "eval_log.csv"
    eval_rows = []
    if ef.exists():
        eval_rows = list(csv.DictReader(ef.open()))
        need = ["ply", "move", "cp_before", "cp_after", "best_move"]
        s["eval_schema"] = 1.0 if eval_rows and all(
            k in eval_rows[0] for k in need) else 0.0
        s["eval_count"] = min(1.0, len(eval_rows) / gt.get("min_eval_rows", 40))
    else:
        s["eval_schema"] = 0.0
        s["eval_count"] = 0.0

    # 3. blunders.json
    bf = rd / "blunders.json"
    if bf.exists():
        try:
            blunders = json.loads(bf.read_text())
            gt_plies = gt.get("blunder_plies", [])
            s["blunders_count"] = min(1.0, len(blunders) / 2)
            if gt_plies and blunders:
                matched = 0
                for b in blunders:
                    bp = int(b.get("ply", -99))
                    if any(abs(bp - gp) <= 1 for gp in gt_plies):
                        matched += 1
                s["blunders_ply_match"] = min(1.0, matched / len(gt_plies))
            else:
                s["blunders_ply_match"] = 0.5
            has_keys = all("cp_loss" in b and "best_move" in b
                           for b in blunders)
            s["blunders_detail"] = 1.0 if has_keys else 0.0
        except Exception:
            s["blunders_count"] = 0.0
            s["blunders_ply_match"] = 0.0
            s["blunders_detail"] = 0.0
    else:
        s["blunders_count"] = 0.0
        s["blunders_ply_match"] = 0.0
        s["blunders_detail"] = 0.0

    # 4-5. board images
    s["board_initial"] = 1.0 if (rd / "board_initial.png").exists() else 0.0
    s["view_initial"] = 1.0 if (rd / "view_initial.png").exists() else 0.0

    # 6. blunder view screenshots
    blunder_views = list(rd.glob("view_blunder_*.png"))
    s["view_blunders"] = min(1.0, len(blunder_views) / 2)

    # 7. annotated PGN
    ap = rd / "annotated.pgn"
    if ap.exists():
        pgn_text = ap.read_text(errors="ignore")
        blunder_comments = len(re.findall(
            r"\{[^}]*[Bb]lunder[^}]*\}", pgn_text))
        s["annotated_pgn"] = min(1.0, blunder_comments / 2)
    else:
        s["annotated_pgn"] = 0.0

    # 8. final view
    s["view_final"] = 1.0 if (rd / "view_final.png").exists() else 0.0

    # 9. analysis report
    ar = rd / "analysis_report.md"
    if ar.exists():
        txt = ar.read_text(errors="ignore").lower()
        has_opening = any(k in txt for k in
                         gt.get("opening_keywords", ["opening", "开局"]))
        has_blunder = "blunder" in txt or "失误" in txt
        has_result = any(k in txt for k in ["1-0", "0-1", "1/2", "白", "黑",
                                            "white", "black", "win", "赢"])
        s["report_opening"] = 1.0 if has_opening else 0.0
        s["report_blunder"] = 1.0 if has_blunder else 0.0
        s["report_result"] = 1.0 if has_result else 0.0
    else:
        s["report_opening"] = 0.0
        s["report_blunder"] = 0.0
        s["report_result"] = 0.0

    # VLM rubric
    try:
        from _judge_helper import vlm_score_rubric
    except Exception:
        vlm_score_rubric = None

    if vlm_score_rubric:
        imgs = [str(p) for p in [
            rd / "view_initial.png",
            *blunder_views,
            rd / "view_final.png"
        ] if p.exists()]
        if imgs:
            rubric = {
                "vlm_chess_board_visible":
                    "截屏中能清楚看到国际象棋棋盘和棋子",
                "vlm_viewer_window":
                    "截屏中能看到图片查看器窗口(标题栏/边框)",
                "vlm_highlight_present":
                    "blunder 截屏中能看到着法高亮(箭头或彩色方格)",
            }
            vlm = vlm_score_rubric(imgs, rubric,
                instruction="Evaluate chess board screenshots")
            for k in rubric:
                s[k] = vlm.get(k, 0.0)

    # --- Content-authenticity sub-scores ---
    s["blunders_min2"] = 0.0
    s["blunders_cp_loss_present"] = 0.0
    bf2 = rd / "blunders.json"
    if bf2.exists():
        try:
            bb = json.loads(bf2.read_text())
            if isinstance(bb, list):
                s["blunders_min2"] = 1.0 if len(bb) >= 2 else 0.0
                if bb and all(
                    isinstance(x, dict)
                    and isinstance(x.get("cp_loss"), (int, float))
                    for x in bb
                ):
                    s["blunders_cp_loss_present"] = 1.0
        except Exception:
            pass

    s["pgn_nag_present"] = 0.0
    ap2 = rd / "annotated.pgn"
    if ap2.exists():
        pt = ap2.read_text(errors="ignore")
        if re.search(r"\$\d+", pt) or re.search(r"\{[^}]*[?!]+[^}]*\}", pt):
            s["pgn_nag_present"] = 1.0

    s["boards_unique"] = 0.0
    try:
        import hashlib
        bd_imgs = list(rd.glob("board_*.png")) + list(rd.glob("view_*.png"))
        hashes = set()
        for p in bd_imgs:
            try:
                hashes.add(hashlib.md5(p.read_bytes()).hexdigest())
            except Exception:
                pass
        if bd_imgs:
            s["boards_unique"] = min(1.0, len(hashes) / 3)
    except Exception:
        pass

    # --- Forbidden imports check ---
    forbidden = ["chess_solver", "stockfish_wrapper_solver"]
    bad_import = False
    for src in ws.rglob("*.py"):
        try:
            t = src.read_text(errors="ignore")
            if any(re.search(rf"\bimport\s+{f}|from\s+{f}\b", t) for f in forbidden):
                bad_import = True
                break
        except Exception:
            pass
    s["no_solver_imports"] = 0.0 if bad_import else 1.0

    # --- Screenshot authenticity: size + resolution ---
    s["screens_size_ok"] = 0.0
    s["screens_resolution_ok"] = 0.0
    try:
        min_bytes = int(gt.get("min_screenshot_bytes", 5120))
        min_w = int(gt.get("min_screenshot_width", 800))
        view_imgs = list(rd.glob("view_*.png"))
        if view_imgs:
            big_enough = [p for p in view_imgs
                          if p.stat().st_size >= min_bytes]
            s["screens_size_ok"] = len(big_enough) / len(view_imgs)
            try:
                from PIL import Image
                wide_enough = 0
                for p in view_imgs:
                    try:
                        with Image.open(p) as im:
                            if im.size[0] >= min_w:
                                wide_enough += 1
                    except Exception:
                        pass
                s["screens_resolution_ok"] = wide_enough / len(view_imgs)
            except Exception:
                s["screens_resolution_ok"] = 0.5
    except Exception:
        pass

    # VLM availability flag (cap if missing)
    vlm_available = vlm_score_rubric is not None and any(
        k.startswith("vlm_") for k in s
    )

    # Hard gates
    has_cli = (s.get("moves_file", 0) > 0 and s.get("eval_count", 0) > 0)
    has_gui = (s.get("view_initial", 0) > 0 or
               s.get("view_blunders", 0) > 0)

    # --- Weighted aggregate (core 60% / gui 30% / aux 10%) ---
    core_keys = ["moves_file", "eval_schema", "eval_count",
                 "blunders_count", "blunders_ply_match", "blunders_detail",
                 "blunders_min2", "blunders_cp_loss_present",
                 "annotated_pgn", "pgn_nag_present"]
    gui_keys = ["board_initial", "view_initial", "view_blunders",
                "view_final", "boards_unique",
                "screens_size_ok", "screens_resolution_ok",
                "vlm_chess_board_visible", "vlm_viewer_window",
                "vlm_highlight_present"]
    aux_keys = ["report_opening", "report_blunder", "report_result",
                "no_solver_imports"]

    def _mean(keys):
        vals = [s[k] for k in keys if k in s and isinstance(s[k], (int, float))]
        return sum(vals) / len(vals) if vals else 0.0

    core = _mean(core_keys)
    gui = _mean(gui_keys)
    aux = _mean(aux_keys)
    base = 0.6 * core + 0.3 * gui + 0.1 * aux

    # Hard gates (tightened)
    if not has_cli:
        base = min(base, 0.35)
    if not has_gui:
        base = min(base, 0.35)
    if s.get("blunders_ply_match", 0) < 0.5:
        base = min(base, 0.45)
    if s.get("blunders_min2", 0) < 1.0:
        base = min(base, 0.4)
    if s.get("blunders_cp_loss_present", 0) < 1.0:
        base = min(base, 0.45)
    if s.get("pgn_nag_present", 0) < 1.0:
        base = min(base, 0.5)
    if s.get("boards_unique", 0) < 1.0:
        base = min(base, 0.5)
    if s.get("screens_size_ok", 0) < 1.0:
        base = min(base, 0.55)
    if s.get("screens_resolution_ok", 0) < 0.7:
        base = min(base, 0.5)
    if s.get("no_solver_imports", 0) < 1.0:
        base = min(base, 0.35)
    # VLM unavailable → cap 0.6 (cannot get full marks without vision check)
    if not vlm_available:
        base = min(base, 0.6)

    s["overall_score"] = float(base)
    return s

```

## Workspace Path

```
workspace/GAM/task_1_stockfish_puzzle_analysis/
```

## Skills

```
chess, CLI UCI protocol, python-chess, image viewer GUI, pgn-extract
```

## Env

```
Ubuntu 22.04 desktop, GNOME, stockfish, pgn-extract, python3, python-chess, Pillow, cairosvg
```

## Warmup

```bash
echo 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 | base64 -d | bash
```