A B C D E F G H I J K L M N O   [ 1]● ==> H8   [ 2]○ ==> I9
 15 ┌┬┬┬┬┬┬┬┬┬┬┬┬┬┐   [ 3]● ==> G7   [ 4]○ ==> I10
 14 ├┼┼┼┼┼┼┼┼┼┼┼┼┼┤   [ 5]● ==> F8   [ 6]○ ==> H9
 13 ├┼┼┼┼┼┼┼┼┼┼┼┼┼┤   [ 7]● ==> E9   [ 8]○ ==> H6
 12 ├┼┼┼┼┼○┼○┼┼┼┼┼┤   [ 9]● ==> I7   [10]○ ==> G9
 11 ├┼┼┼┼┼○┼┼●┼┼┼┼┤   [11]● ==> J9   [12]○ ==> I12
 10 ├┼┼┼┼○●●○┼┼┼┼┼┤   [13]● ==> I8   [14]○ ==> G8
  9 ├┼┼┼●●○○○●┼┼┼┼┤   [15]● ==> F7   [16]○ ==> H7
  8 ├┼┼┼┼●○●●┼┼┼┼┼┤   [17]● ==> F9   [18]○ ==> F10
  7 ├┼┼┼┼●●○●┼┼┼┼┼┤   [19]● ==> J11  [20]○ ==> G11
  6 ├┼┼┼┼┼┼○┼┼┼┼┼┼┤   [21]● ==> H10  [22]○ ==> G12
  5 ├┼┼┼┼┼┼┼┼┼┼┼┼┼┤   [23]● ==> G10
  4 ├┼┼┼┼┼┼┼┼┼┼┼┼┼┤
  3 ├┼┼┼┼┼┼┼┼┼┼┼┼┼┤
  2 ├┼┼┼┼┼┼┼┼┼┼┼┼┼┤
  1 └┴┴┴┴┴┴┴┴┴┴┴┴┴┘