Event: Ipswich Chess Club Championship

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Opponent	Rating	Result
David Wright	1718	0 - 1
James Stow	1094	1 - 0
Martyn Colebrook	1512	0 - 1

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

1308 = (4324 + 400 * (1 - 2)) / 3)