Event: Ilkley Chess Club Championship

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Opponent	Rating	Result
Martin Hawkins	0	1 - 0
Lee Crawford	147	0 - 1
David W Adam	143	½ - ½
Bill Tait	133	0 - 1

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

6 = (423 + 400 * (1 - 2)) / 4)