Event: IM Brown Shield

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Opponent	Rating	Result
Paul Howden	1711	1 - 0
Mark Waterhouse	1704	0 - 1
Paul Gelder	1578	0 - 1

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

1531 = (4993 + 400 * (1 - 2)) / 3)