Event: Div1

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Opponent	Rating	Result
Anthony L Natt	167	0 - 1
Michael D Johnson	171	½ - ½
James R Shore	138	1 - 0
David Williams	165	1 - 0
Ian S Kingston	176	½ - ½
Luke S Alldread	150	0 - 1
Kevin J Dalley	171	1 - 0
Andrew Toothill	162	½ - ½
Michael D Johnson	176	½ - ½
Geoffrey D Brown	151	½ - ½
Alan F Downham	168	0 - 1
Steven J Burke	167	½ - ½

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

164 = (1962 + 400 * (3 - 3)) / 12)