{
  "request": {
    "program": "#! title Three workers, three jobs\n#! about A 3×3 grid: row r is a worker, column c a job, and + means worker r takes job c. Each row and each column holds exactly one +, every other cell -. The first version could not write this above 2×2; here each cell takes only + and -, and every state of lowest energy is one of the six assignments.\n#! expect works\n#! item cell\n#! plus chosen\n#! minus not chosen\n#! check exactly 1 0-1-2 3-4-5 6-7-8 0-3-6 1-4-7 2-5-8\n#\n# Variable 3·r + c is the cell of row r and column c: + chosen, - not.\nvars 9\nexactly 1 0 1 2\nexactly 1 3 4 5\nexactly 1 6 7 8\nexactly 1 0 3 6\nexactly 1 1 4 7\nexactly 1 2 5 8\nsolve restarts=8 steps=40\n",
    "seed": "7",
    "protocol": "wai.quantum.landscape/2"
  },
  "result": {
    "protocol": "wai.quantum.landscape/2",
    "label": "A classical emulator of the settling model of a planned energy-based processor, running on your machine. Energies are computed exactly. The joule line prices a run at temperature 0 at the settle rate measured on an FPGA board running this project's open reference design, with a published figure for one integer add beside it for scale, and leaves a run above temperature 0 unpriced, saying why. No photonic hardware, custom chip or quantum effect is involved in this run.",
    "member": {
      "id": "cpu:reference",
      "class": "cpu",
      "kernel": "wai.quantum.landscape2/sample",
      "parity": "reference"
    },
    "program_digest": "191eaa2742c11adcdca2c4af2eedd897cd6406d6c4f93a7ce4924191645448dc",
    "title": "Three workers, three jobs",
    "about": "A 3×3 grid: row r is a worker, column c a job, and + means worker r takes job c. Each row and each column holds exactly one +, every other cell -. The first version could not write this above 2×2; here each cell takes only + and -, and every state of lowest energy is one of the six assignments.",
    "item": "cell",
    "expect": "works",
    "variables": 9,
    "pairs": 18,
    "seed": "7",
    "mode": "sample",
    "mode_words": "Sampling (above temperature 0): 8 random starts of 40 sweeps each, cooling from temperature 2 to 0. That temperature is the default: the square root of the mean couplings a variable has, and at least 1. The lowest energy found is kept. The randomness is classical, from a seeded generator.",
    "temperature": 2.0,
    "temperature_from": "landscape",
    "restarts": 8,
    "sweeps": 40,
    "state": "--++---+-",
    "groups": [
      {
        "name": "chosen",
        "items": [
          2,
          3,
          7
        ]
      },
      {
        "name": "not chosen",
        "items": [
          0,
          1,
          4,
          5,
          6,
          8
        ]
      }
    ],
    "energy": -21,
    "truth": {
      "arrangements": 19683,
      "lowest": -21.0,
      "at_lowest": 6,
      "at_lowest_passing": 6,
      "example": "--+-+-+--"
    },
    "reached": true,
    "declared": null,
    "warnings": [],
    "checks": [
      {
        "kind": "exactly",
        "passed": true,
        "detail": "All 6 groups hold exactly 1 +, and their other variables −."
      }
    ],
    "verdict": "solved",
    "summary": "It reached energy -21. That is the lowest possible: all 19,683 arrangements were checked, and 6 of them share it.",
    "work": {
      "sweeps": 320,
      "accumulates": 11520,
      "cell_updates": 2880,
      "draws": 2808,
      "ended": "every sweep run",
      "rests": true
    },
    "joules": {
      "kind": "unpriced",
      "class": null,
      "describes": "nothing: no rate with evidence covers a run above temperature 0",
      "line": "Not priced: 11,520 accumulates counted, and no rate with evidence behind it covers a run above temperature 0. This is no figure, not a figure of 0.",
      "rate_pj_per_accumulate": null,
      "rate_source": null,
      "evidence": [
        "wai/wai-quantum-landscape-fpga/README.md (What it measured: Power, the null controls)",
        "wai/wai-quantum-landscape-fpga/measurements/2026-11-06/emio-classes/null.dat"
      ],
      "pj": null,
      "published_add": null,
      "left_out": null,
      "why": null,
      "metered": null
    },
    "state_hash": "29cf75b4a4159595",
    "replay": "4eaed7664d21fb6a75d2715a09e533e47942188528e8e1bd038eec958a999933",
    "engine": {
      "name": "wai-quantum",
      "version": "0.9.0"
    },
    "schema": "wai.quantum.landscape/2",
    "receipt": {
      "alg": "ed25519",
      "canon": "rfc8785",
      "key": "197f6b23e16c8532c6abc838facd5ea789be0c76b2920334039bfa8b3d368d61",
      "digest": "1f7e8c0f989e17087891c96f763db0b33d95f676a508b4b9dc7e9323627304ff",
      "signature": "bff179dc5087f2d5069f82d0972539e1601623810c4fd48e3a71759043894e94ee46a6d83eee41b4033229f7b9a12ec56fdeac7af25bde16a47e175d9fd40e00"
    }
  }
}