Oops! I Resigned Again!

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Manufacturer
Ian Rogers
Opdrachtschaak

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En Passant Games
Open Files

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Wolfgang Uhlmann/Schmidt
Open Games with ...Bc5

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Manufacturer
Sam Collins
Opening Encyclopaedia 2026

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Manufacturer
Chessbase
Opening Lab

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Manufacturer
Nikolai Kalinichenko
Opening Originals

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Manufacturer
Daniel Lowinger