Each game fork has its own rules. Additional forks may be possible if the particular game would allow it at the time. Reunifications must be legal in all affected forks.
Tuj - an admirable first move Sir. I hope this game goes on and on. I should mention that I intend to mprove the helpfulness of the HTML checker - but it might be a while til I get the chance. In the meantime you might wish to run it through an online validator (e.g. this one).