structures:
  main:
    bits: 64
    ranges:
      63:
        name: h8
        description: top-right corner
      62:
        name: g8
      61:
        name: f8
      60:
        name: e8
      59:
        name: d8
      58:
        name: c8
      57:
        name: b8
      56:
        name: a8
        description: top-left corner
      55:
        name: h7
      54:
        name: g7
      53:
        name: f7
      52:
        name: e7
      51:
        name: d7
      50:
        name: c7
      49:
        name: b7
      48:
        name: a7
      47:
        name: h6
      46:
        name: g6
      45:
        name: f6
      44:
        name: e6
      43:
        name: d6
      42:
        name: c6
      41:
        name: b6
      40:
        name: a6
      39:
        name: h5
      38:
        name: g5
      37:
        name: f5
      36:
        name: e5
      35:
        name: d5
      34:
        name: c5
      33:
        name: b5
      32:
        name: a5
      31:
        name: h4
      30:
        name: g4
      29:
        name: f4
      28:
        name: e4
      27:
        name: d4
      26:
        name: c4
      25:
        name: b4
      24:
        name: a4
      23:
        name: h3
      22:
        name: g3
      21:
        name: f3
      20:
        name: e3
      19:
        name: d3
      18:
        name: c3
      17:
        name: b3
      16:
        name: a3
      15:
        name: h2
      14:
        name: g2
      13:
        name: f2
      12:
        name: e2
      11:
        name: d2
      10:
        name: c2
      9:
        name: b2
      8:
        name: a2
      7:
        name: h1
      6:
        name: g1
      5:
        name: f1
      4:
        name: e1
      3:
        name: d1
      2:
        name: c1
      1:
        name: b1
      0:
        name: a1
        description: bottom-left corner