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;;; chess-tutorial.el --- A simple chess training display
;; Copyright (C) 2002, 2004, 2014 Free Software Foundation, Inc.
;; Author: John Wiegley <johnw@gnu.org>
;; Maintainer: Mario Lang <mlang@delysid.org>
;; Keywords: games
;; This program is free software; you can redistribute it and/or modify
;; it under the terms of the GNU General Public License as published by
;; the Free Software Foundation, either version 3 of the License, or
;; (at your option) any later version.
;; This program is distributed in the hope that it will be useful,
;; but WITHOUT ANY WARRANTY; without even the implied warranty of
;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
;; GNU General Public License for more details.
;; You should have received a copy of the GNU General Public License
;; along with this program. If not, see <http://www.gnu.org/licenses/>.
;;; Commentary:
;; `M-x chess-tutorial' implements a simple knight movement exercise.
;; The objective is to take all pawns on the chessboard without moving to a
;; square which is attacked by a queen.
;;; Code:
(require 'chess)
(require 'chess-display)
(require 'chess-game)
(require 'chess-message)
(chess-message-catalog 'english
'((queen-would-take . "The queen would take your knight!")
(congratulations . "Congratulations!")
(knight-1-done . "Goal: take all the pawns, without letting the queen take your knight")
(cannot-take-queen . "You cannot take the queen")))
(defun chess-tutorial-knight-1 (game _ignore event &rest _args)
(if (eq event 'move)
(let ((position (chess-game-pos game)))
(if (null (chess-pos-search position ?p))
(chess-message 'congratulations)
(cond
((chess-search-position position
(car (chess-pos-search position ?N)) ?q)
(let ((chess-display-handling-event nil))
(chess-game-undo game 1))
(chess-error 'queen-would-take))
((not (chess-pos-search position ?q))
(let ((chess-display-handling-event nil))
(chess-game-undo game 1))
(chess-error 'cannot-take-queen)))))))
;;;###autoload
(defun chess-tutorial ()
"A simple chess training display."
(interactive)
(with-current-buffer (chess-create-display t)
(chess-module-set-leader nil)
(chess-display-set-from-fen "8/3p1p/2p3p/4q/2p3p/3p1p/8/N w - -")
(chess-game-add-hook (chess-display-game nil) 'chess-tutorial-knight-1)
(setq chess-pos-always-white t)
(chess-display-popup nil)
(chess-message 'knight-1-done)))
(provide 'chess-tutorial)
;;; chess-tutorial.el ends here
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