Event: Division 2

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Opponent	Rating	Result
D Ian Calvert	2011	½ - ½
Martin G Smith	1911	1 - 0
Steven JL Rix	2044	0 - 1

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

1989 = (5966 + 400 * (1 - 1)) / 3)