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alanback: The advantage of letting the opponent see, is that by them accepting you can jump ahead that many moves all at once. This wouldn't be used much early, but can be very useful later when there are forced moves for a few moves.
(gem) Hvis du vil spille et spil med en modspiller som er på omtrent samme niveau kan du lave en invitation med et ønsket BKR-område. Da kan kun de spillere med den BKR se og acceptere invitationen. (Katechka) (vis alle tips)