Nothingness: Look at White moves 58 and 59 You'll see the 5 moves from i1 to h1 Then from h1 to i1 It violates the rule that a piece cannot move back to the square it had vacated on the previous move..
(hide) When moving in a game you can choose which one will show up next by selecting the appropriate option in the list next to the submit button. (pauloaguia) (show all tips)