Event: Lewisham Club Championship

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Opponent	Rating	Result
Matthew Helsby	1209	½ - ½
David E Brown	1799	0 - 1
Conrad Hall	1564	0 - 1

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

1257 = (4572 + 400 * (0 - 2)) / 3)