Event: South Cheshire Shield

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Opponent	Rating	Result
Isaac Stanley	1441	0 - 1
Philip Grocott	1364	0 - 1
James Joynson	1200	1 - 0

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

1202 = (4005 + 400 * (1 - 2)) / 3)