Event: Div1

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Opponent	Rating	Result
Kevin J Dalley	159	1 - 0
Alan F Downham	162	0 - 1
Michael D Johnson	169	½ - ½
D Martin Howard	175	0 - 1
Kevin J Dalley	159	0 - 1
Andrew J Mort	158	0 - 1
Maurice J Hill	147	½ - ½
Andrew Toothill	168	½ - ½

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

12 = (1297 + 400 * (1 - 4)) / 8)