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Originally, you could hit the "Back" button and place multiple pawns in the same column in screen chess, for example. I asked Fencer about it, and he fixed it.
About the back button not removing the piece...When you place a piece, it is stored in the server. Hitting the back button simply shows you an older version of the page (in cache memory) without that new piece. Then, when you click on a new square to add a new piece, that other piece is still on the server, so it displays it. Doesn't it remove it when you click on it?
(ocultar) Si deseas encontrar un adversario de parecido nivel de juego al tuyo, echa un vistazo en la página de Clasificaciones del tipo de juego que quieres y busca a uno con un BKR similar. (pauloaguia) (mostrar todos los consejos)