Event: Ipswich Chess Club Championship

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Opponent	Rating	Result
Philip J Chapman	1287	0 - 1
Martyn Colebrook	1512	0 - 1
Gary Kilpatrick	1400	1 - 0

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

1266 = (4199 + 400 * (1 - 2)) / 3)