Event: Open

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Opponent	Rating	Result
Henrik Stepanyan	203	0 - 1
Nicholas A Walker	181	1 - 0
Frank Wood	146	½ - ½
Jon Turner	153	½ - ½
Henrik Stepanyan	203	0 - 1
Nicholas A Walker	181	0 - 1
Frank Wood	146	0 - 1
Jon Turner	153	1 - 0

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

71 = (1366 + 400 * (2 - 4)) / 8)