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;;; chess-perft.el --- Perft tests for emacs-chess -*- lexical-binding: t; -*-
;; Copyright (C) 2014 Mario Lang
;; Author: 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:
;; Counts all leave nodes to a certain depth.
;;; Code:
(require 'chess-fen)
(require 'chess-ply)
(require 'chess-pos)
(require 'ert)
(defun chess-perft (position depth)
(if (= depth 1)
(length (chess-legal-plies position :color (chess-pos-side-to-move position)))
(let ((nodes 0))
(dolist (ply
(chess-legal-plies position
:color (chess-pos-side-to-move position))
nodes)
(setq nodes (+ nodes (chess-perft (chess-ply-next-pos ply)
(1- depth))))))))
(ert-deftest chess-perft-1 ()
(should (= (chess-perft (chess-pos-create) 1) 20)))
(ert-deftest chess-perft-2 ()
(should (= (chess-perft (chess-pos-create) 2) 400)))
(ert-deftest chess-perft-3 ()
(should (= (chess-perft (chess-pos-create) 3) 8902)))
(ert-deftest chess-perft-4 ()
(should (= (chess-perft (chess-pos-create) 4) 197281)))
(ert-deftest chess-perft-5 ()
(should (= (chess-perft (chess-pos-create) 5) 4865609)))
(ert-deftest chess-perft-kiwipete-1 ()
(let ((position (chess-fen-to-pos
"r3k2r/p1ppqpb1/bn2pnp1/3PN3/1p2P3/2N2Q1p/PPPBBPPP/R3K2R w KQkq -")))
(should (= (chess-perft position 1) 48))))
(ert-deftest chess-perft-kiwipete-2 ()
(let ((position (chess-fen-to-pos
"r3k2r/p1ppqpb1/bn2pnp1/3PN3/1p2P3/2N2Q1p/PPPBBPPP/R3K2R w KQkq -")))
(should (= (chess-perft position 2) 2039))))
(ert-deftest chess-perft-kiwipete-3 ()
(let ((position (chess-fen-to-pos
"r3k2r/p1ppqpb1/bn2pnp1/3PN3/1p2P3/2N2Q1p/PPPBBPPP/R3K2R w KQkq -")))
(should (= (chess-perft position 3) 97862))))
(provide 'chess-perft)
;;; chess-perft.el ends here
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