Event: Walker Shield

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Opponent	Rating	Result
Robert Twigg	1383	0 - 1
Roy J McAloney	1352	1 - 0
Michael Davies	1278	0 - 1
James PW Smith	1368	0 - 1
William Horsford	903	0 - 1
Roy J McAloney	1352	1 - 0
I Redmond	1315	1 - 0
Oliver Ladd	850	1 - 0
Darren Coker	1090	½ - ½

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

1210 = (10891 + 400 * (4 - 4)) / 9)