{
  "name": "2048 strategy benchmark v1",
  "board": "4x4",
  "games_per_strategy": 500,
  "total_games": 2000,
  "start_tiles": 2,
  "spawn_probabilities": {"2": 0.9, "4": 0.1},
  "seed_rule": "i * 7919 + 17",
  "note": "Simple automated heuristics for comparing decision principles; not optimal AI play.",
  "results": {
    "random": {"average_score": 1095, "median_score": 1036, "p90_score": 1688, "best_score": 2932, "average_moves": 119, "reach_512_percent": 0.0, "reach_1024_percent": 0.0, "reach_2048_percent": 0.0},
    "merge_first": {"average_score": 1973, "median_score": 1756, "p90_score": 3072, "best_score": 5512, "average_moves": 178, "reach_512_percent": 2.4, "reach_1024_percent": 0.0, "reach_2048_percent": 0.0},
    "corner_chain": {"average_score": 3764, "median_score": 3320, "p90_score": 6560, "best_score": 15028, "average_moves": 296, "reach_512_percent": 22.8, "reach_1024_percent": 1.6, "reach_2048_percent": 0.0},
    "corner_one_step_lookahead": {"average_score": 9474, "median_score": 7588, "p90_score": 16976, "best_score": 37804, "average_moves": 611, "reach_512_percent": 60.4, "reach_1024_percent": 31.2, "reach_2048_percent": 8.0}
  }
}