Event: Division 4

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Opponent	Rating	Result
Oliver Martin	1542	½ - ½
Stephen D Blewitt	1710	½ - ½
Philip Crompton	1459	1 - 0

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

1704 = (4711 + 400 * (1 - 0)) / 3)