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I would like to second David's comments, particularly regarding the pawn promotion. You have created a new piece combining all moves which can only be attained by pawn promotion; I see little reason to offer under-promotion. You already have to have an Amazon piece in the set, so you shouldn't need the option to promote to weaker pieces for that reason. Also, the more promotion options you allow, the slower computer programs which play the game become. The more promotion options there are, the more legal moves there are, and the larger the search tree becomes.

I do think this game looks interesting, though. I like the starting array, especially the symmetry. I'll post a Game Courier invitation shortly, and give it a try...