Event: Walker Shield

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Opponent	Rating	Result
Mark Towlson	1540	1 - 0
Clive J Le Baigue	1548	0 - 1
Malcolm Snashall	1474	0 - 1
Leon A Garfield	1480	0 - 1
James PW Smith	1368	0 - 1
Daniel Allen	1188	1 - 0
Jimmy Phillips	1437	0 - 1
I Redmond	1315	0 - 1

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

1219 = (11350 + 400 * (2 - 6)) / 8)