Not really, infact, it will only help expose such "secreat allinces". since the vassel offer is visable to all, you could easly show that two people were abusing this to win too many games together.

here is an interesting stale mate breaker, offer vassel status to another player.

once a vassel offer is made, it can't be retracted (however the player getting the offer, can decide not to accept it). when making an offer, it is placed on the log, so everyone can see. and what it means is this ...

I leave in Israel, and I thought of making an Israel Conquer Map.

the following link is a good place to start from: http://www.moc.gov.il/new/documents/engineering/israel1.jpg

ofcourse my map will be somewhat differant (the south is missing the the above map, and there are too many terr' on it ...