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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:
;; The classic perft function counts all leaf nodes at a certain depth.
;; To make it easier to identify specific problems we also count properties
;; of the (final) plies. We count capturing plies, en passant plies,
;; castling plies, plies that promote to a piece,
;; plies which bring the opponent king in check and plies which result in
;; checkmate.
;; For more details about perft in general, see
;; <URL:https://chessprogramming.wikispaces.com/Perft>.
;; Typically, depths greater than 4 will result in very long runtimes.
;; We only define tests which don't take a lot of execution time
;; (less than a million nodes).
;; To make it easier to selectively run tests, most tests provide tags
;; to indentify which types of plies they are covering.
;; The available ERT tags are:
;; `:capture', `:en-passant', `:castle', `:promotion',
;; `:check' and `:checkmate'.
;;
;; For instance, to make sure castling plies work as expected, you might run
;; M-: (ert '(tag :castle)) RET
;;; Code:
(require 'chess-fen)
(require 'chess-ply)
(require 'chess-pos)
(require 'cl-lib)
(require 'ert)
(defun chess-perft (position depth)
"Count all leaf nodes of the tree starting at POSITION pruned at DEPTH.
If not called interactively the result is a list of the form
\(LEAFS CAPTURES EN-PASSANTS CASTLES PROMOTIONS CHECKS CHECKMATES)."
(interactive (list (or (ignore-errors (chess-display-position nil))
(chess-fen-to-pos (read-string "FEN: " nil nil
(chess-pos-to-fen
(chess-pos-create)))))
(read-number "Depth: " 1)))
(if (zerop depth)
(cl-values 1 0 0 0 0 0 0)
(let ((plies (chess-legal-plies position
:color (chess-pos-side-to-move position)))
(nodes 0) (captures 0) (en-passants 0) (castles 0) (promotions 0)
(checks 0) (checkmates 0))
(if (= depth 1)
(dolist (ply plies)
(cl-incf nodes)
(when (let ((position (chess-ply-pos ply)))
(chess-pos-piece-p position (chess-ply-target ply)
(not (chess-pos-side-to-move position))))
(cl-incf captures))
(when (chess-ply-keyword ply :en-passant)
(cl-incf captures)
(cl-incf en-passants))
(if (chess-ply-any-keyword ply :castle :long-castle)
(cl-incf castles)
(when (chess-ply-keyword ply :promote)
(cl-incf promotions)))
(when (chess-ply-any-keyword ply :check :checkmate)
(cl-incf checks))
(when (chess-ply-any-keyword ply :checkmate)
(cl-incf checkmates)) )
(let ((progress (when (called-interactively-p 'any)
(make-progress-reporter "Perft... " 0 (length plies))))
(index 0))
(when (and (not noninteractive) (= depth 2)) (accept-process-output))
(dolist (ply plies)
(unless (chess-ply-final-p ply)
(cl-multiple-value-bind (n c e ca p ch cm)
(chess-perft (chess-ply-next-pos ply) (1- depth))
(cl-incf nodes n)
(cl-incf captures c)
(cl-incf en-passants e)
(cl-incf castles ca)
(cl-incf promotions p)
(cl-incf checks ch)
(cl-incf checkmates cm)))
(when progress
(cl-incf index)
(progress-reporter-force-update
progress index (format "Perft... (%d nodes) " nodes))))))
(if (called-interactively-p 'any)
(message "%d nodes (%d captures (%d ep), %d castles, %d promotions and %d checks (%d mate))"
nodes captures en-passants castles promotions checks checkmates)
(cl-values nodes
captures en-passants castles promotions checks checkmates)))))
(ert-deftest chess-perft-startpos-depth1 ()
(should (equal (chess-perft (chess-pos-create) 1) '(20 0 0 0 0 0 0))))
(ert-deftest chess-perft-startpos-depth2 ()
(should (equal (chess-perft (chess-pos-create) 2) '(400 0 0 0 0 0 0))))
(ert-deftest chess-perft-startpos-depth3 ()
:tags '(:capture :check)
(should (equal (chess-perft (chess-pos-create) 3) '(8902 34 0 0 0 12 0))))
(ert-deftest chess-perft-startpos-depth4 ()
:tags '(:capture :check :checkmate)
(should (equal (chess-perft (chess-pos-create) 4)
'(197281 1576 0 0 0 469 8))))
(ert-deftest chess-perft-startpos-depth5 ()
:tags '(:capture :en-passant :check :checkmate)
(should (equal (chess-perft (chess-pos-create) 5) '(4865609 82719 258 0 0 27351 347))))
(ert-deftest chess-perft-kiwipete-depth1 ()
:tags '(:capture :castle)
(let ((position
(chess-fen-to-pos
"r3k2r/p1ppqpb1/bn2pnp1/3PN3/1p2P3/2N2Q1p/PPPBBPPP/R3K2R w KQkq -")))
(should (equal (chess-perft position 1) '(48 8 0 2 0 0 0)))))
(ert-deftest chess-perft-kiwipete-depth2 ()
:tags '(:capture :en-passant :castle :check)
(let ((position
(chess-fen-to-pos
"r3k2r/p1ppqpb1/bn2pnp1/3PN3/1p2P3/2N2Q1p/PPPBBPPP/R3K2R w KQkq -")))
(should (equal (chess-perft position 2) '(2039 351 1 91 0 3 0)))))
(ert-deftest chess-perft-kiwipete-depth3 ()
:tags '(:capture :en-passant :castle :check :checkmate)
(let ((position
(chess-fen-to-pos
"r3k2r/p1ppqpb1/bn2pnp1/3PN3/1p2P3/2N2Q1p/PPPBBPPP/R3K2R w KQkq -")))
(should (equal (chess-perft position 3) '(97862 17102 45 3162 0 993 1)))))
(ert-deftest chess-perft-kiwipete-depth4 ()
:tags '(:capture :en-passant :castle :promote :check :checkmate)
(let ((position
(chess-fen-to-pos
"r3k2r/p1ppqpb1/bn2pnp1/3PN3/1p2P3/2N2Q1p/PPPBBPPP/R3K2R w KQkq -")))
(should (equal (chess-perft position 4)
'(4085603 757163 1929 128013 15172 25523 43)))))
(ert-deftest chess-perft-pos3-depth1 ()
:tags '(:capture :check)
(let ((position (chess-fen-to-pos "8/2p5/3p4/KP5r/1R3p1k/8/4P1P1/8 w - -")))
(should (equal (chess-perft position 1) '(14 1 0 0 0 2 0)))))
(ert-deftest chess-perft-pos3-depth2 ()
:tags '(:capture :check)
(let ((position (chess-fen-to-pos "8/2p5/3p4/KP5r/1R3p1k/8/4P1P1/8 w - -")))
(should (equal (chess-perft position 2) '(191 14 0 0 0 10 0)))))
(ert-deftest chess-perft-pos3-depth3 ()
:tags '(:capture :en-passant :check)
(let ((position (chess-fen-to-pos "8/2p5/3p4/KP5r/1R3p1k/8/4P1P1/8 w - -")))
(should (equal (chess-perft position 3) '(2812 209 2 0 0 267 0)))))
(ert-deftest chess-perft-pos3-depth4 ()
:tags '(:capture :en-passant :check :checkmate)
(let ((position (chess-fen-to-pos "8/2p5/3p4/KP5r/1R3p1k/8/4P1P1/8 w - -")))
(should (equal (chess-perft position 4) '(43238 3348 123 0 0 1680 17)))))
(ert-deftest chess-perft-pos3-depth5 ()
:tags '(:capture :en-passant :check)
(let ((position (chess-fen-to-pos "8/2p5/3p4/KP5r/1R3p1k/8/4P1P1/8 w - -")))
(should (equal (chess-perft position 5) '(674624 52051 1165 0 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 0 0)))))
(ert-deftest chess-perft-pos4-depth2 ()
:tags '(:capture :castle :promotion :check)
(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 0 6 48 10 0)))))
(ert-deftest chess-perft-pos4-depth3 ()
:tags '(:capture :en-passant :promotion :check :checkmate)
(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 4 0 120 38 22)))))
(ert-deftest chess-perft-pos4-depth4 ()
:tags '(:capture :castle :promotion :check :checkmate)
(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 0 7795 60032 15492 5)))))
(provide 'chess-perft)
;;; chess-perft.el ends here
|
