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Fencer: I don't think that regular chess rules actually forbid the king giving check - that would be a redundant rule: in regular chess, the only squares a king can ever attack are the squares directly surrounding it - but since it cannot be next to the opposing king (as it would threaten the square), it cannot give check.
But if giving check is not allowed, I would like to report a bug. In this game I played a move (6... d6) that emptied the diagonal between the kings, and it marked the move as "giving check". I do not know whether my opponent was forced to move his king - but he shouldn't if the king wasn't allowed to give check.