Event: Haslemere Trophy

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Opponent	Rating	Result
Peter Hasson	2218	0 - 1
Rory Davies	0	0 - 1
Rory Davies	0	1 - 0
Peter Hasson	2218	½ - ½

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

1009 = (4436 + 400 * (1 - 2)) / 4)