A B C D E F G H I J K L M N O   [ 1]● ==> H8   [ 2]○ ==> H9
 15 ┌┬┬┬┬┬┬┬┬┬┬┬┬┬┐   [ 3]● ==> H7   [ 4]○ ==> H6
 14 ├┼┼┼┼┼┼┼┼┼┼┼┼┼┤   [ 5]● ==> I9   [ 6]○ ==> G7
 13 ├┼┼┼┼┼┼┼┼┼┼┼┼┼┤   [ 7]● ==> F8   [ 8]○ ==> I8
 12 ├┼┼┼┼┼┼┼┼┼┼┼┼┼┤   [ 9]● ==> F10  [10]○ ==> J7
 11 ├┼┼┼○●┼●○┼┼┼┼┼┤   [11]● ==> K6   [12]○ ==> J8
 10 ├┼┼┼┼●○┼┼●┼┼┼┼┤   [13]● ==> I7   [14]○ ==> J6
  9 ├┼┼┼┼○●○●┼┼┼┼┼┤   [15]● ==> J5   [16]○ ==> G8
  8 ├┼┼┼○●○●○○┼┼┼┼┤   [17]● ==> F7   [18]○ ==> G10
  7 ├┼┼┼○●○●●○┼┼┼┼┤   [19]● ==> F11  [20]○ ==> F9
  6 ├┼┼┼●●○○┼○●┼┼┼┤   [21]● ==> G9   [22]○ ==> E11
  5 ├┼┼┼┼○●●┼●○○┼┼┤   [23]● ==> J10  [24]○ ==> E7
  4 ├┼┼┼┼┼○┼●┼●┼┼┼┤   [25]● ==> F6   [26]○ ==> E8
  3 ├┼┼┼┼┼┼○┼●┼┼┼┼┤   [27]● ==> H11  [28]○ ==> F5
  2 ├┼┼┼┼┼┼┼┼┼┼┼┼┼┤   [29]● ==> E6   [30]○ ==> I11
  1 └┴┴┴┴┴┴┴┴┴┴┴┴┴┘   [31]● ==> K4   [32]○ ==> K5
        [33]● ==> I4   [34]○ ==> H3
        [35]● ==> J3   [36]○ ==> G4
        [37]● ==> H5   [38]○ ==> G6
        [39]● ==> G5   [40]○ ==> L5