Event: WMA Spring League Division 2

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Opponent	Rating	Result
Paul Roper	1781	0 - 1
Richard D Leaper	1653	½ - ½
Ian Ellis	1675	0 - 1
Jeremy Humphries	1509	½ - ½
Robin Hayles	1604	½ - ½
Paul Roper	1781	1 - 0
Richard D Leaper	1653	½ - ½
Ian Ellis	1675	0 - 1
Jeremy Humphries	1509	1 - 0
Robin Hayles	1604	½ - ½

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

1604 = (16444 + 400 * (2 - 3)) / 10)