Event: Division 1

Opponent Rating Result
Graham J Kershaw 1675 0 - 1
Terry D Whitton 1924 0 - 1
Colin L Ellis 1495 1 - 0
David King 1300 ½ - ½
Ivor BN Smith 1870 ½ - ½
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1573 = (8264 + 400 * (1 - 2)) / 5)

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