Event: Durham League Division B

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Opponent	Rating	Result
Graham R Marshall	1452	½ - ½
Joe McGinnis	1543	1 - 0
Graham R Marshall	1452	1 - 0
John Reddington	1517	1 - 0
Carl Stephens	1598	1 - 0
Callum Abbott	1465	0 - 1
Alex Potter	1480	0 - 1

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

1615 = (10507 + 400 * (4 - 2)) / 7)