Anderssen won the London 1862 chess tournament, the first international round-robin tournament (in which each participant plays a game against each of the others) with a score of twelve wins out of thirteen games. He lost only one game, to the Rev. John Owen and finished two points ahead of Louis Paulsen, who had the best playing record in the early 1860s. Morphy had retired from chess at this time, so Anderssen was again generally regarded as the world's leading active player.