Event: Hillingdon Div 3

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Opponent	Rating	Result
Daniil Donskikh	0	0 - 1
Anthony Braine	1625	0 - 1
Richard O'Neill	1547	1 - 0
Gabriele Martellotta	1380	0 - 1
Richard O'Neill	1547	1 - 0
Gabriele Martellotta	1427	1 - 0
Dhairye Gauri	1530	0 - 1

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

1237 = (9056 + 400 * (3 - 4)) / 7)