Not by a long chalk

This expression dating from the early 19th century means not by any means or not at all and is sometimes used in the context of a contest. Its origin derives from British taverns that used chalk to mark-up scores in various tavern games. The practice survives today in the game of darts. A long chalk meant that a player was far ahead in terms of the score chalked up and therefore was most likely to win the game. A determined opponent, however, might say, “The game is not over by a long chalk” signalling one last effort to catch up despite being a long chalk behind. See also Not by a long shot.