Hmm... it might be difficult to remove a tile if it has been dropped into a hole. How about placing the Cathar tile on top of the siege tile? This way, anyone can use the variant by just printing out the Cathar tiles on paper...
That would work as well, so long as the replaced tile is not re-used all will be well. However, in my 'finished' pdf rules, I have eliminated this problem completely. You must decide if you will besiege the city
before laying the tile.
I have given this a bit more thought and also removed the dice mechanic. I did not like the way that it could penalise the person who drew the tile should they roll an even number (2,4,6). If they would have rolled an even number, the Siege tile would have been wasted, thereby assisting his opponent. Now you get a choice to besige a city or to use the tile as a regular tile. Deciding to besiege the city and exchange the tile for the Cathar tile is now instead of 'moving the wood' to bring a bit of balance (meaning that you can't besiege an opponents city and 'move the wood' to this tile on the same turn and maybe gain extra points, this would punish the opponent too much). Have a look at the pdf, all will be clear... hopefully
A direct link to the pdf is here:
Invasion of CatharismAgain, any suggestions, let me know.