Event: Essex OL Open Championship

Opponent Rating Result
Julian Corfield 1956 1 - 0
Martin McCall 1999 0 - 1
David Gatheral 1600 1 - 0
Russell P White 2098 0 - 1
Robin Slade 1995 0 - 1
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1850 = (9648 + 400 * (2 - 3)) / 5)

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