Event: 4 Board League B

Opponent Rating Result
Callum Welsh 1953 1 - 0
Simon Jones 1403 1 - 0
Richard Zaidman 1674 1 - 0
Callum Welsh 1918 1 - 0
Lee Crawford 1848 0 - 1
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1999 = (8796 + 400 * (4 - 1)) / 5)

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