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In a proof, we would probably count horizontal and vetical distance separately, so L3U4, for example, which fits on a 13x13 board, would be seven spaces from center.
(hide) If you are waiting for your turn, click on "change" next to the "refresh" on the main page, then set refresh the page to 30 seconds to get your turn to move displayed faster. (Servant) (show all tips)