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Ingy döt Net 2023-07-01 11:58:00 -04:00
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Task/Generate-Chess960-starting-position/EchoLisp/generate-chess960-starting-position.l Normal file
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(define-values (K Q R B N) (iota 5))
(define *pos* (list R N B Q K B N R)) ;; standard starter
;; check opposite color bishops, and King between rooks
(define (legal-pos p)
(and
(> (list-index K p) (list-index R p))
(> (list-index K (reverse p)) (list-index R (reverse p)))
(even? (+ (list-index B p) (list-index B (reverse p))))))
;; random shuffle current position until a legal one is found
(define (c960)
(set! *pos* (shuffle *pos*))
(if (legal-pos *pos*)
(map unicode-piece *pos*) (c960)))