[ [ -1, 0,1,0, 0, 0,-1, 0 ],
  [  0,-1,0,1, 0, 0, 0,-1 ],
  [  1, 0,0,0,-1, 0, 0, 0 ],
  [  0, 1,0,0, 0,-1, 0, 0 ],
  [ -1,-1,0,0, 1, 1, 0, 0 ],
  [  0, 0,0,0, 0, 0, 0, 0 ] ]