Single Comment

Rich Hutnik:
| Do you want a flipped rook to become a 'Jester' piece that can 
| represent any other piece on the board?  Guess what the rook does 
| now.  It is that.  
This has never been a problem when I was playing OTB games. In most variants the choice of promotion piece is a rather academic one anyway, as in practice almost always the strongest piece is chosen. After the promotion, if the piece is then not captured, the game is over in 5 or 6 moves...

Even in Capablanca Chess, where there are 3 nearly equivalent pieces available (Q, C and A), it took me months before I discvered that 'underpromotion' to C or A was not properly implemented in my engine Joker80. Although it was considering other promotions than Q in its search, the MakeMove routine at game level always promoted to Q, overruling the choice. This never changed the game result, and I only discovered it when Joker80 announced mate-in-1 on a promotion move, and then the game continued a few more moves before it actually was checkmate.

People that want to play variants should have a wider choice of piece equipment anyway. An inverted Rook is a warning sign that whatever it is, it is not a Rook. But nothing is more annoying to a Chess player than having a Knight on the board that doesn't move like a Knight, but as a Camel or Zebra. The solution to that is easy enough:

http://home.hccnet.nl/h.g.muller/ultima.html