Event: Hillingdon Div 1

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Opponent	Rating	Result
Alfie Onslow	2270	1 - 0
Greg J Breed	1831	1 - 0
Shreyas Royal	2503	0 - 1
George Horan	1935	0 - 1
David C Okike	2212	½ - ½
David C Okike	2207	0 - 1
Leon HJ Fincham	1827	1 - 0
Eldar Gasanov	2531	0 - 1
Martin Smith	2300	0 - 1

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

2091 = (19616 + 400 * (3 - 5)) / 9)