Event: Division 3

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Opponent	Rating	Result
Geoffrey D Dring	1577	½ - ½
Michael Jennings	1496	½ - ½
Dean Scott	1182	1 - 0
Jonathan Penn	1663	0 - 1
Geoffrey D Dring	1587	½ - ½
Jayden Gamlin	1358	1 - 0
Barry R Davies	1449	1 - 0

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

1587 = (10312 + 400 * (3 - 1)) / 7)