Castle through check????

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WordUpp

What gives

here???  I always assumed one could not castle "through" check!  In this instance, my opponent is allowed to cancel through the B1 square that my bishop is guarding!  Is my interpretation wrong??

xFallesafe
The king can’t pass through check, but the rook can.
WordUpp

Thanks much!!  That explains it!!!

 

blueemu

Rooks laugh at checks.