Event: Ipswich Chess Club Championship

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Opponent	Rating	Result
Simon Riley	1702	0 - 1
Luke Griffin	1400	1 - 0(def)
James Stow	1094	½ - ½

performance = (sum(opponents ratings) + 400(wins-losses)) / games

1198 = (2796 + 400 * (0 - 1)) / 2)