Event: Div1

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Opponent	Rating	Result
Peter JE Ackley	189	0 - 1
Michael D Johnson	169	0 - 1
Shabir Okhai	192	½ - ½
Anthony L Natt	168	1 - 0
Michael J Alderson	176	½ - ½
Derek A Jarvis	178	0 - 1
Mike Alcock	163	½ - ½
David G Levens	152	1 - 0
Jaime Castro	154	½ - ½
Sohrab Panday	164	½ - ½
Steven J Burke	172	½ - ½
Michael D Johnson	169	½ - ½
David Williams	159	0 - 1
Ross Murphy	149	½ - ½

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

111 = (2354 + 400 * (2 - 4)) / 14)