According to the rules, a piece cannot move back to the square it moved from on the previous move. As I understand it, there was a bug that allowed such moves in certain circumstances. Has that bug been fixed?
(nascondi) Quando muovi in una partita puoi scegliere con quale partita continuare selezionando l'opzione adatta nella lista vicino al bottone MUOVI. (pauloaguia) (mostra tutti i suggerimenti)