s-exp-based piece description samples

; (knight) ==>
((1 . 2) (2 . 1) (2 . -1) (1 . -2) (-1 . 2) (-2 . 1) (-2 . -1) (-1 . -2))

; (rook) ==>
(((0 . 1) (:RANGE :LENGTH :INFINITE)) ((0 . -1) (:RANGE :LENGTH :INFINITE))
 ((1 . 0) (:RANGE :LENGTH :INFINITE)) ((-1 . 0) (:RANGE :LENGTH :INFINITE)))