{
  "schema_version": 1,
  "title": "Reproduction: How Reasoning Evolves from Post-Training Data: An Empirical Study Using Chess",
  "emoji": "🎯",
  "space_id": "nathanael-fijalkow/repro-how-reasoning-evolves-from-post-training-data-an-empirical-study-using-chess",
  "paper": {
    "arxiv_id": "2604.05134"
  },
  "tags": [
    "icml2026-repro",
    "paper-w0y3obJwmh"
  ],
  "updated_at": "2026-07-21T14:29:21+00:00",
  "root": {
    "slug": "index",
    "title": "Reproduction: How Reasoning Evolves from Post-Training Data: An Empirical Study Using Chess",
    "file": "pages/index.md",
    "children": [
      {
        "slug": "executive-summary",
        "title": "Executive summary",
        "file": "pages/executive-summary/page.md",
        "children": []
      },
      {
        "slug": "claim-1-best-move-sft-enables-rl-but-yields-unfaithful-reasoning",
        "title": "Claim 1: Best-Move SFT enables RL but yields unfaithful reasoning",
        "file": "pages/claim-1-best-move-sft-enables-rl-but-yields-unfaithful-reasoning/page.md",
        "children": []
      },
      {
        "slug": "claim-2-best-line-multi-move-sft-matches-rl-performance-with-faithful-reasoning",
        "title": "Claim 2: Best-Line (multi-move) SFT matches RL performance with faithful reasoning",
        "file": "pages/claim-2-best-line-multi-move-sft-matches-rl-performance-with-faithful-reasoning/page.md",
        "children": []
      },
      {
        "slug": "claim-3-post-rl-legality-and-move-rank-metrics-best-move-vs-best-line",
        "title": "Claim 3: Post-RL legality and move-rank metrics (Best Move vs Best Line)",
        "file": "pages/claim-3-post-rl-legality-and-move-rank-metrics-best-move-vs-best-line/page.md",
        "children": []
      },
      {
        "slug": "claim-4-rl-shifts-move-quality-and-reduces-hallucination",
        "title": "Claim 4: RL shifts move quality and reduces hallucination",
        "file": "pages/claim-4-rl-shifts-move-quality-and-reduces-hallucination/page.md",
        "children": []
      },
      {
        "slug": "claim-5-sft-time-metrics-predict-downstream-rl-performance",
        "title": "Claim 5: SFT-time metrics predict downstream RL performance",
        "file": "pages/claim-5-sft-time-metrics-predict-downstream-rl-performance/page.md",
        "children": []
      },
      {
        "slug": "claim-6-resulting-7b-model-beats-leading-open-source-chess-llms",
        "title": "Claim 6: Resulting 7B model beats leading open-source chess LLMs",
        "file": "pages/claim-6-resulting-7b-model-beats-leading-open-source-chess-llms/page.md",
        "children": []
      },
      {
        "slug": "conclusion",
        "title": "Conclusion",
        "file": "pages/conclusion/page.md",
        "children": []
      }
    ]
  },
  "agent_view_tokens": 8290,
  "revision": "1784644161515126000"
}