[Bug 70929] Backport knights 0.6-7.1ubuntu2

[Martin Meredith]

Public bug reported:

Backport to fix castling bug

** Affects: edgy-backports (upstream)
     Importance: Undecided
         Status: Unconfirmed

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Backport knights 0.6-7.1ubuntu2
https://launchpad.net/bugs/70929