Event: Cambs Division 2

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Opponent	Rating	Result
Michael Kowalczyk	1413	1 - 0
Peter Baddeley	1617	0 - 1
Neal Fisher	1676	0 - 1
Paul Spencer	1785	½ - ½
Michael Kowalczyk	1413	1 - 0

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

1581 = (7904 + 400 * (2 - 2)) / 5)