Event: Walker Shield

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Opponent	Rating	Result
Malcolm Snashall	98	½ - ½
Robert Twigg	80	0 - 1
John R Couzens	108	½ - ½
Reginald G Pidduck	99	1 - 0
Sean Duffy	71	1 - 0
Gary Hilleard	107	0 - 1
James PW Smith	93	1 - 0
Robert Twigg	80	1 - 0

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

192 = (736 + 400 * (4 - 2)) / 8)