Tower Of Hanoi Hanoi 2disc Expert — Set 23

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{
    "title": "Tower of Hanoi: 2 Disks — Expert #23",
    "diskCount": 2,
    "taskType": "error-identify",
    "pegs": {
        "A": "Peg A (Start)",
        "B": "Peg B (Spare)",
        "C": "Peg C (Goal)"
    },
    "initialState": {
        "A": [
            2,
            1
        ],
        "B": [],
        "C": []
    },
    "targetState": {
        "A": [],
        "B": [],
        "C": [
            2,
            1
        ]
    },
    "partialState": null,
    "movesCompleted": null,
    "solution": [
        {
            "step": 1,
            "from": "A",
            "to": "B",
            "diskSize": 1,
            "description": "Move disk 1 (smallest) from peg A to peg B."
        },
        {
            "step": 2,
            "from": "A",
            "to": "C",
            "diskSize": 2,
            "description": "Move disk 2 (largest) from peg A to peg C."
        },
        {
            "step": 3,
            "from": "B",
            "to": "C",
            "diskSize": 1,
            "description": "Move disk 1 (smallest) from peg B to peg C."
        }
    ],
    "erroneousSolution": [
        {
            "step": 1,
            "from": "A",
            "to": "B",
            "diskSize": 1,
            "description": "Move disk 1 (smallest) from peg A to peg B."
        },
        {
            "step": 2,
            "from": "C",
            "to": "A",
            "diskSize": 2,
            "description": "Move disk 2 from peg C to peg A."
        },
        {
            "step": 3,
            "from": "B",
            "to": "C",
            "diskSize": 1,
            "description": "Move disk 1 (smallest) from peg B to peg C."
        }
    ],
    "errorStep": 2,
    "optimalMoveCount": 3,
    "question": "The move sequence below contains exactly one illegal move. Identify the step number that violates the rules and explain why it is wrong.",
    "rules": [
        "Only one disk may be moved at a time.",
        "A disk can only be placed on top of a larger disk or on an empty peg.",
        "You must move the entire stack from peg A to peg C."
    ],
    "hint": "An illegal move places a larger disk on top of a smaller one, or moves a disk that is not on top of its stack.",
    "_archetype": null,
    "_generatorId": null
}