Event: Tonbridge league

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Opponent Rating Result
Alex Tyson 0 1 - 0
Otto stapely O’Neill 0 ½ - ½
Conrad Szarowicz 61 1 - 0
performance = (sum(opponents ratings) + 400(wins-losses)) / games

287 = (61 + 400 * (2 - 0)) / 3)

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