Event: Durham League Division B

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Opponent	Rating	Result
Toefl Lankapura	1499	1 - 0
Graham W Matthews	1592	½ - ½
Barry Edgar	1616	½ - ½
Deborah Edmundson	1506	0 - 1
Thomas Finn	0	1 - 0
Jason Robson	1445	0 - 1
Lee Douglas	1549	½ - ½

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

1315 = (9207 + 400 * (2 - 2)) / 7)