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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 (zerop depth)
(cl-values 1 0 0 0 0)
(let ((plies (chess-legal-plies position
:color (chess-pos-side-to-move position))))
(if (= depth 1)
(cl-values (length plies)
(cl-count-if
(lambda (ply)
(or (chess-pos-piece-p
(chess-ply-pos ply) (chess-ply-target ply)
(not (chess-pos-side-to-move (chess-ply-pos ply))))
(let ((en-passant (chess-pos-en-passant
(chess-ply-pos ply))))
(and en-passant
(/= (chess-pos-piece
(chess-ply-pos ply) en-passant)
(chess-pos-piece
(chess-ply-next-pos ply) en-passant))))))
plies)
(cl-count-if
(lambda (ply)
(chess-ply-any-keyword ply :castle :long-castle))
plies)
(cl-count-if
(lambda (ply)
(chess-ply-any-keyword ply :check :checkmate))
plies)
(cl-count-if
(lambda (ply)
(chess-ply-any-keyword ply :checkmate))
plies))
(let ((nodes 0) (captures 0) (castles 0) (checks 0) (checkmates 0))
(dolist (ply plies (cl-values nodes captures castles checks checkmates))
(cl-multiple-value-bind (n c ca ch cm)
(chess-perft (chess-ply-next-pos ply) (1- depth))
(cl-incf nodes n)
(cl-incf captures c)
(cl-incf castles ca)
(cl-incf checks ch)
(cl-incf checkmates cm))))))))
(ert-deftest chess-perft-startpos-depth1 ()
(should (equal (chess-perft (chess-pos-create) 1) '(20 0 0 0 0))))
(ert-deftest chess-perft-startpos-depth2 ()
(should (equal (chess-perft (chess-pos-create) 2) '(400 0 0 0 0))))
(ert-deftest chess-perft-startpos-depth3 ()
(should (equal (chess-perft (chess-pos-create) 3) '(8902 34 0 12 0))))
(ert-deftest chess-perft-startpos-depth4 ()
(should (equal (chess-perft (chess-pos-create) 4) '(197281 1576 0 469 8))))
(ert-deftest chess-perft-kiwipete-depth1 ()
(let ((position
(chess-fen-to-pos
"r3k2r/p1ppqpb1/bn2pnp1/3PN3/1p2P3/2N2Q1p/PPPBBPPP/R3K2R w KQkq -")))
(should (equal (chess-perft position 1) '(48 8 2 0 0)))))
(ert-deftest chess-perft-kiwipete-depth2 ()
(let ((position
(chess-fen-to-pos
"r3k2r/p1ppqpb1/bn2pnp1/3PN3/1p2P3/2N2Q1p/PPPBBPPP/R3K2R w KQkq -")))
(should (equal (chess-perft position 2) '(2039 351 91 3 0)))))
(ert-deftest chess-perft-kiwipete-depth3 ()
(let ((position
(chess-fen-to-pos
"r3k2r/p1ppqpb1/bn2pnp1/3PN3/1p2P3/2N2Q1p/PPPBBPPP/R3K2R w KQkq -")))
(should (equal (chess-perft position 3) '(97862 17102 3162 993 1)))))
(ert-deftest chess-perft-pos3-depth1 ()
(let ((position (chess-fen-to-pos "8/2p5/3p4/KP5r/1R3p1k/8/4P1P1/8 w - -")))
(should (equal (chess-perft position 1) '(14 1 0 2 0)))))
(ert-deftest chess-perft-pos3-depth2 ()
(let ((position (chess-fen-to-pos "8/2p5/3p4/KP5r/1R3p1k/8/4P1P1/8 w - -")))
(should (equal (chess-perft position 2) '(191 14 0 10 0)))))
(ert-deftest chess-perft-pos3-depth3 ()
(let ((position (chess-fen-to-pos "8/2p5/3p4/KP5r/1R3p1k/8/4P1P1/8 w - -")))
(should (equal (chess-perft position 3) '(2812 209 0 267 0)))))
(ert-deftest chess-perft-pos3-depth4 ()
(let ((position (chess-fen-to-pos "8/2p5/3p4/KP5r/1R3p1k/8/4P1P1/8 w - -")))
(should (equal (chess-perft position 4) '(43238 3348 0 1680 17)))))
(ert-deftest chess-perft-pos3-depth5 ()
(let ((position (chess-fen-to-pos "8/2p5/3p4/KP5r/1R3p1k/8/4P1P1/8 w - -")))
(should (equal (chess-perft position 5) '(674624 52051 0 52950 0)))))
(ert-deftest chess-perft-pos4-depth1 ()
(let ((chess-ply-allow-interactive-query nil)
(position
(chess-fen-to-pos
"r3k2r/Pppp1ppp/1b3nbN/nP6/BBP1P3/q4N2/Pp1P2PP/R2Q1RK1 w kq -")))
(should (equal (chess-perft position 1) '(6 0 0 0 0)))))
(ert-deftest chess-perft-pos4-depth2 ()
(let ((chess-ply-allow-interactive-query nil)
(position
(chess-fen-to-pos
"r3k2r/Pppp1ppp/1b3nbN/nP6/BBP1P3/q4N2/Pp1P2PP/R2Q1RK1 w kq -")))
(should (equal (chess-perft position 2) '(264 87 6 10 0)))))
(ert-deftest chess-perft-pos4-depth3 ()
(let ((chess-ply-allow-interactive-query nil)
(position
(chess-fen-to-pos
"r3k2r/Pppp1ppp/1b3nbN/nP6/BBP1P3/q4N2/Pp1P2PP/R2Q1RK1 w kq -")))
(should (equal (chess-perft position 3) '(9467 1021 0 38 22)))))
(ert-deftest chess-perft-pos4-depth4 ()
(let ((chess-ply-allow-interactive-query nil)
(position
(chess-fen-to-pos
"r3k2r/Pppp1ppp/1b3nbN/nP6/BBP1P3/q4N2/Pp1P2PP/R2Q1RK1 w kq -")))
(should (equal (chess-perft position 4) '(422333 131393 7795 15492 5)))))
(provide 'chess-perft)
;;; chess-perft.el ends here
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