{
  "description": "Test cases involving pawns.",
  "testCases": [
    {
      "start": {
        "fen": "7k/8/8/8/pPp5/8/8/7K b - b3 0 1",
        "description": "Two possible en passant capture possibilities."
      },
      "expected": [
        {
          "move": "a3",
          "fen": "7k/8/8/8/1Pp5/p7/8/7K w - - 0 2"
        },
        {
          "move": "axb3",
          "fen": "7k/8/8/8/2p5/1p6/8/7K w - - 0 2"
        },
        {
          "move": "c3",
          "fen": "7k/8/8/8/pP6/2p5/8/7K w - - 0 2"
        },
        {
          "move": "cxb3",
          "fen": "7k/8/8/8/p7/1p6/8/7K w - - 0 2"
        },
        {
          "move": "Kg7",
          "fen": "8/6k1/8/8/pPp5/8/8/7K w - - 1 2"
        },
        {
          "move": "Kh7",
          "fen": "8/7k/8/8/pPp5/8/8/7K w - - 1 2"
        },
        {
          "move": "Kg8",
          "fen": "6k1/8/8/8/pPp5/8/8/7K w - - 1 2"
        }
      ]
    },
    {
      "description": "Transpose of 7k/8/8/8/pPp5/8/8/7K b - b3 0 1",
      "start": {
        "fen": "7k/8/8/PpP5/8/8/8/7K w - b6 0 1",
        "description": "Two possible en passant capture possibilities."
      },
      "expected": [
        {
          "move": "Kg1",
          "fen": "7k/8/8/PpP5/8/8/8/6K1 b - - 1 1"
        },
        {
          "move": "Kg2",
          "fen": "7k/8/8/PpP5/8/8/6K1/8 b - - 1 1"
        },
        {
          "move": "Kh2",
          "fen": "7k/8/8/PpP5/8/8/7K/8 b - - 1 1"
        },
        {
          "move": "a6",
          "fen": "7k/8/P7/1pP5/8/8/8/7K b - - 0 1"
        },
        {
          "move": "axb6",
          "fen": "7k/8/1P6/2P5/8/8/8/7K b - - 0 1"
        },
        {
          "move": "c6",
          "fen": "7k/8/2P5/Pp6/8/8/8/7K b - - 0 1"
        },
        {
          "move": "cxb6",
          "fen": "7k/8/1P6/P7/8/8/8/7K b - - 0 1"
        }
      ]
    },
    {
      "start": {
        "fen": "7k/8/8/8/pPp5/8/8/7K b - - 0 1",
        "description": "Same position but without the en passant capture possibilities."
      },
      "expected": [
        {
          "move": "a3",
          "fen": "7k/8/8/8/1Pp5/p7/8/7K w - - 0 2"
        },
        {
          "move": "c3",
          "fen": "7k/8/8/8/pP6/2p5/8/7K w - - 0 2"
        },
        {
          "move": "Kg7",
          "fen": "8/6k1/8/8/pPp5/8/8/7K w - - 1 2"
        },
        {
          "move": "Kh7",
          "fen": "8/7k/8/8/pPp5/8/8/7K w - - 1 2"
        },
        {
          "move": "Kg8",
          "fen": "6k1/8/8/8/pPp5/8/8/7K w - - 1 2"
        }
      ]
    },
    {
      "description": "Transpose of 7k/8/8/8/pPp5/8/8/7K b - - 0 1",
      "start": {
        "fen": "7k/8/8/PpP5/8/8/8/7K w - - 0 1",
        "description": "Same position but without the en passant capture possibilities."
      },
      "expected": [
        {
          "move": "Kg1",
          "fen": "7k/8/8/PpP5/8/8/8/6K1 b - - 1 1"
        },
        {
          "move": "Kg2",
          "fen": "7k/8/8/PpP5/8/8/6K1/8 b - - 1 1"
        },
        {
          "move": "Kh2",
          "fen": "7k/8/8/PpP5/8/8/7K/8 b - - 1 1"
        },
        {
          "move": "a6",
          "fen": "7k/8/P7/1pP5/8/8/8/7K b - - 0 1"
        },
        {
          "move": "c6",
          "fen": "7k/8/2P5/Pp6/8/8/8/7K b - - 0 1"
        }
      ]
    },
    {
      "start": {
        "fen": "8/4k3/1p1p1p1p/pPpPpPpP/P1P1P1P1/8/5K2/8 w - - 0 1",
        "description": "Full set of pawns but no moves."
      },
      "expected": [
        {
          "move": "Ke1",
          "fen": "8/4k3/1p1p1p1p/pPpPpPpP/P1P1P1P1/8/8/4K3 b - - 1 1"
        },
        {
          "move": "Kf1",
          "fen": "8/4k3/1p1p1p1p/pPpPpPpP/P1P1P1P1/8/8/5K2 b - - 1 1"
        },
        {
          "move": "Kg1",
          "fen": "8/4k3/1p1p1p1p/pPpPpPpP/P1P1P1P1/8/8/6K1 b - - 1 1"
        },
        {
          "move": "Ke2",
          "fen": "8/4k3/1p1p1p1p/pPpPpPpP/P1P1P1P1/8/4K3/8 b - - 1 1"
        },
        {
          "move": "Kg2",
          "fen": "8/4k3/1p1p1p1p/pPpPpPpP/P1P1P1P1/8/6K1/8 b - - 1 1"
        },
        {
          "move": "Ke3",
          "fen": "8/4k3/1p1p1p1p/pPpPpPpP/P1P1P1P1/4K3/8/8 b - - 1 1"
        },
        {
          "move": "Kf3",
          "fen": "8/4k3/1p1p1p1p/pPpPpPpP/P1P1P1P1/5K2/8/8 b - - 1 1"
        },
        {
          "move": "Kg3",
          "fen": "8/4k3/1p1p1p1p/pPpPpPpP/P1P1P1P1/6K1/8/8 b - - 1 1"
        }
      ]
    },
    {
      "description": "Transpose of 8/4k3/1p1p1p1p/pPpPpPpP/P1P1P1P1/8/5K2/8 w - - 0 1",
      "start": {
        "fen": "8/5k2/8/p1p1p1p1/PpPpPpPp/1P1P1P1P/4K3/8 b - - 0 1",
        "description": "Full set of pawns but no moves."
      },
      "expected": [
        {
          "move": "Ke6",
          "fen": "8/8/4k3/p1p1p1p1/PpPpPpPp/1P1P1P1P/4K3/8 w - - 1 2"
        },
        {
          "move": "Kf6",
          "fen": "8/8/5k2/p1p1p1p1/PpPpPpPp/1P1P1P1P/4K3/8 w - - 1 2"
        },
        {
          "move": "Kg6",
          "fen": "8/8/6k1/p1p1p1p1/PpPpPpPp/1P1P1P1P/4K3/8 w - - 1 2"
        },
        {
          "move": "Ke7",
          "fen": "8/4k3/8/p1p1p1p1/PpPpPpPp/1P1P1P1P/4K3/8 w - - 1 2"
        },
        {
          "move": "Kg7",
          "fen": "8/6k1/8/p1p1p1p1/PpPpPpPp/1P1P1P1P/4K3/8 w - - 1 2"
        },
        {
          "move": "Ke8",
          "fen": "4k3/8/8/p1p1p1p1/PpPpPpPp/1P1P1P1P/4K3/8 w - - 1 2"
        },
        {
          "move": "Kf8",
          "fen": "5k2/8/8/p1p1p1p1/PpPpPpPp/1P1P1P1P/4K3/8 w - - 1 2"
        },
        {
          "move": "Kg8",
          "fen": "6k1/8/8/p1p1p1p1/PpPpPpPp/1P1P1P1P/4K3/8 w - - 1 2"
        }
      ]
    },
    {
      "start": {
        "fen": "8/8/4k3/8/2pPp3/8/B7/7K b - d3 0 1",
        "description": "Black has two en passant possibilities, but only one is legal."
      },
      "expected": [
        {
          "move": "e3",
          "fen": "8/8/4k3/8/2pP4/4p3/B7/7K w - - 0 2"
        },
        {
          "move": "exd3",
          "fen": "8/8/4k3/8/2p5/3p4/B7/7K w - - 0 2"
        },
        {
          "move": "Kd5",
          "fen": "8/8/8/3k4/2pPp3/8/B7/7K w - - 1 2"
        },
        {
          "move": "Kf5",
          "fen": "8/8/8/5k2/2pPp3/8/B7/7K w - - 1 2"
        },
        {
          "move": "Kd6",
          "fen": "8/8/3k4/8/2pPp3/8/B7/7K w - - 1 2"
        },
        {
          "move": "Kf6",
          "fen": "8/8/5k2/8/2pPp3/8/B7/7K w - - 1 2"
        },
        {
          "move": "Kd7",
          "fen": "8/3k4/8/8/2pPp3/8/B7/7K w - - 1 2"
        },
        {
          "move": "Ke7",
          "fen": "8/4k3/8/8/2pPp3/8/B7/7K w - - 1 2"
        },
        {
          "move": "Kf7",
          "fen": "8/5k2/8/8/2pPp3/8/B7/7K w - - 1 2"
        }
      ]
    },
    {
      "description": "Transpose of 8/8/4k3/8/2pPp3/8/B7/7K b - d3 0 1",
      "start": {
        "fen": "7k/b7/8/2PpP3/8/4K3/8/8 w - d6 0 1",
        "description": "White has two en passant possibilities, but only one is legal."
      },
      "expected": [
        {
          "move": "Kd2",
          "fen": "7k/b7/8/2PpP3/8/8/3K4/8 b - - 1 1"
        },
        {
          "move": "Ke2",
          "fen": "7k/b7/8/2PpP3/8/8/4K3/8 b - - 1 1"
        },
        {
          "move": "Kf2",
          "fen": "7k/b7/8/2PpP3/8/8/5K2/8 b - - 1 1"
        },
        {
          "move": "Kd3",
          "fen": "7k/b7/8/2PpP3/8/3K4/8/8 b - - 1 1"
        },
        {
          "move": "Kf3",
          "fen": "7k/b7/8/2PpP3/8/5K2/8/8 b - - 1 1"
        },
        {
          "move": "Kd4",
          "fen": "7k/b7/8/2PpP3/3K4/8/8/8 b - - 1 1"
        },
        {
          "move": "Kf4",
          "fen": "7k/b7/8/2PpP3/5K2/8/8/8 b - - 1 1"
        },
        {
          "move": "e6",
          "fen": "7k/b7/4P3/2Pp4/8/4K3/8/8 b - - 0 1"
        },
        {
          "move": "exd6",
          "fen": "7k/b7/3P4/2P5/8/4K3/8/8 b - - 0 1"
        }
      ]
    }
  ]
}