Thanks Derek for the pdf.
Jeremy you are totally right. I don't know why I forgot the arranging
phase in Arimaa. Of course this is a relevant factor, even if we don't
know how strong this factor is compared with the other 2 I have told (high
complexity of the game and shortrange pieces).
Maybe I should talk about Shogi instead. (By the way, a new discussions has
been open about the first move advantage in Shogi.) Shogi is very close to
Chess but it seems much more balanced. Why?