Event: Croydon Shield

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Opponent	Rating	Result
Luke Hartley	2017	1 - 0
Mark P Smith	2120	½ - ½
J Mark O'Neill	1957	1 - 0

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

2298 = (6094 + 400 * (2 - 0)) / 3)