Event: Hillingdon Div 3

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Opponent	Rating	Result
Gesneria-Codruta Cepoi	1361	0 - 1
Richard O'Neill	1531	½ - ½

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

1246 = (2892 + 400 * (0 - 1)) / 2)