Author: Steven Edwards
Date: 11:02:51 01/23/04
Go up one level in this thread
On January 22, 2004 at 22:58:00, Robert Hyatt wrote:
>On January 22, 2004 at 10:03:55, Steven Edwards wrote:
>>;;;; emp.lsp: Enumerate movepaths
>>
>>(defun emp (theFEN theDepth)
>> "Enumerate distinct movepaths from a FEN string to a depth"
>> (cond
>> ((not (string? theFEN))
>> "Error: first argument must be a FEN string")
>> ((not (and (integer? theDepth) (nonnegative? theDepth)))
>> "Error: second argument must be a nonnegative integer")
>> (t
>> (let ((thePos (PosFromFEN theFEN)))
>> (if (null? thePos)
>> "Error: invalid position"
>> (emp-aux thePos theDepth))))))
>>
>>(defun emp-aux (thePos theDepth)
>> "Enumerate distinct movepaths from a position to a depth"
>> (cond
>> ((= theDepth 0) 1)
>> ((= theDepth 1) (length (Generate thePos)))
>> (t
>> (let ((theSum 0) (theEnv nil) (theMove nil) (theML (Generate thePos)))
>> (dolist (theMove theML)
>> (Execute theMove thePos theEnv)
>> (incf theSum (emp-aux thePos (1- theDepth)))
>> (Retract theMove thePos theEnv))
>> theSum))))
>
>you know, when I was first introduced to Lisp a _long_ time ago, I looked
>the person right in the eye and said "that is a write-only language."
No, APL is a write-only langage. BYTE 's APL theme issue of long ago had an APL
chess program that was all of three paragraphs long.
>Thank goodness vi supports the % key. :)
Emacs is the One True Way; also it is in fact a Lisp rogram with its own
interpreter and compiler. Here's the Emacs chess-crafty.el (interface) source:
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;;
;; Play against crafty!
;;
(require 'chess-common)
(defgroup chess-crafty nil
"The publically available chess engine 'crafty'."
:group 'chess-engine)
(defcustom chess-crafty-path (or (executable-find "crafty")
(executable-find "wcrafty"))
"The path to the crafty executable."
:type 'file
:group 'chess-crafty)
(defvar chess-crafty-evaluation nil)
(make-variable-buffer-local 'chess-crafty-evaluation)
(defvar chess-crafty-regexp-alist
(list
(cons (concat "\\(White\\|Black\\)\\s-*([0-9]+):\\s-+\\("
chess-algebraic-regexp "\\)\\s-*$")
(function
(lambda ()
(funcall chess-engine-response-handler 'move
(chess-engine-convert-algebraic (match-string 2) t)))))
(cons "total evaluation\\.+\\s-+\\([-+0-9.]+\\)"
(function
(lambda ()
(setq chess-crafty-evaluation
(string-to-number (match-string 1))))))
(cons "{\\(Black\\|White\\) resigns}"
(function
(lambda ()
(funcall chess-engine-response-handler 'resign))))
(cons "\\(Illegal move\\|unrecognized/illegal command\\):\\s-*\\(.*\\)"
(function
(lambda ()
(error (match-string 1)))))
(cons "command not legal now"
(function
(lambda ()
(error (match-string 0)))))))
(defun chess-crafty-handler (game event &rest args)
(unless chess-engine-handling-event
(cond
((eq event 'initialize)
(let ((proc (chess-common-handler game 'initialize "crafty")))
(when (and proc (processp proc)
(eq (process-status proc) 'run))
(process-send-string proc (concat "display nogeneral\n"
"display nochanges\n"
"display noextstats\n"
"display nohashstats\n"
"display nomoves\n"
"display nonodes\n"
"display noply1\n"
"display nostats\n"
"display notime\n"
"display novariation\n"
"alarm off\n"
"ansi off\n"))
(setq chess-engine-process proc
chess-engine-opponent-name "Crafty")
t)))
((eq event 'setup-pos)
(chess-engine-send nil (format "setboard %s\n"
(chess-pos-to-string (car args)))))
((eq event 'evaluate)
(setq chess-crafty-evaluation nil)
(chess-engine-send nil "display general\nscore\ndisplay nogeneral\n")
(let ((limit 50))
(while (and (null chess-crafty-evaluation)
(> (setq limit (1- limit)) 0))
(sit-for 0 100 t))
chess-crafty-evaluation))
((eq event 'setup-game)
(let ((file (chess-with-temp-file
(insert (chess-game-to-string (car args)) ?\n))))
(chess-engine-send nil (format "read %s\n" file))))
((eq event 'set-option)
(cond
((eq (car args) 'resign)
(if (cadr args)
(chess-engine-send nil "resign 9\n")
(chess-engine-send nil "resign -1\n")))
((eq (car args) 'ponder)
(if (cadr args)
(chess-engine-send nil "ponder on\n")
(chess-engine-send nil "ponder off\n")))))
(t
(if (and (eq event 'undo)
(= 1 (mod (car args) 2)))
(error "Cannot undo until after crafty moves"))
(apply 'chess-common-handler game event args)))))
(provide 'chess-crafty)
;;; chess-crafty.el ends here
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