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1. sorry, I forgot to enter my name in the last post

2. A lazy queen (or amazon) captures like a queen (the amazon like a
knight also) but cannot move to an empty square.

Somehow I like the idea that demoting ends with some 'lazy' piece,
which
only captures. But there are other possibilities too, of course.

If this were a modification or a different game, depends on the pont of
view, I think. I just want to give some ideas, maybe leading to a new
game. The coding of demotion can be done so (shown with a bishop which
demotes to knight):


(define slide                ;;normal sliding move
  ( $1 (while empty? add $1)
    (verify enemy?) add
  )
)
(define slidebishop
  ( $1
    (while empty? (add Knight) $1) ;; demote on empty square
    (verify enemy?) add            ;; dont demote when capturing
  )
)

....

  (piece
     (name Bishop)
     (image White '...' Black '...')
     (moves
        (slide nw) (slide ne)
        (slidebishop sw) (slidebishop se)
     )
  )