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|
;;; chess-polyglot.el --- Polyglot book access for Emacs -*- 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:
;;
;;; Code:
(eval-when-compile (require 'cl-lib))
(require 'chess-ply)
(require 'chess-pos)
(defsubst chess-polyglot-read-octets (count)
(let ((val 0))
(dotimes (i count (progn (cl-assert (<= val most-positive-fixnum)) val))
(setq val (logior (lsh val 8)
(progn (forward-char 1) (preceding-char)))))))
(defsubst chess-polyglot-read-key ()
(cons (chess-polyglot-read-octets 4) (chess-polyglot-read-octets 4)))
(defun chess-polyglot-read-move ()
(let ((mask (chess-polyglot-read-octets 2)))
(pcase (let (r)
(dotimes (i 5 r)
(push (logand mask 7) r)
(setq mask (ash mask -3))))
(`(,promotion ,from-rank ,from-file ,to-rank ,to-file)
(list (chess-rf-to-index (- 7 from-rank) from-file)
(chess-rf-to-index (- 7 to-rank) to-file)
(nth promotion '(nil ?N ?B ?R ?Q))
(chess-polyglot-read-octets 2))))))
(defun chess-polyglot-move-to-ply (position from to promotion weight)
"Convert a polyglot move for POSITION to a ply."
(cl-assert (vectorp position))
(cl-assert (integerp from))
(cl-assert (integerp to))
(cl-assert (memq promotion '(nil ?N ?B ?R ?Q)))
(cl-assert (integerp weight))
(let ((ply (apply #'chess-ply-create position nil
(if (and (= from
(chess-pos-king-index
position (chess-pos-side-to-move position)))
(= (chess-index-rank from) (chess-index-rank to))
(or (= (chess-index-file to) 0)
(= (chess-index-file to) 7)))
(chess-ply-castling-changes
position (= (chess-index-file to) 0))
(nconc (list from to)
(when promotion (list :promote promotion)))))))
(chess-ply-set-keyword ply :polyglot-book-weight weight)
ply))
(defsubst chess-polyglot-skip-learn ()
(forward-char 4))
(defun chess-polyglot-moves (key &optional low high)
(unless low (setq low 0))
(unless high (setq high (1- (/ (buffer-size) 16))))
(let ((mid (/ (+ low high) 2)))
(goto-char (1+ (* mid 16)))
(let ((mid-key (chess-polyglot-read-key)))
(cond
((= low high)
(when (equal key mid-key)
(chess-polyglot-read-move)))
((< (car key) (car mid-key))
(chess-polyglot-moves key low mid))
((> (car key) (car mid-key))
(chess-polyglot-moves key (1+ mid) high))
(t (cond
((< (cdr key) (cdr mid-key))
(chess-polyglot-moves key low mid))
((> (cdr key) (cdr mid-key))
(chess-polyglot-moves key (1+ mid) high))
(t (when (> (point) 16) (forward-char -16))
(while (progn (forward-char -8)
(and (> (point) 16) (equal key (chess-polyglot-read-key))))
(forward-char -16))
(forward-char 8)
(let (moves)
(while (equal key (chess-polyglot-read-key))
(setq moves (nconc moves (list (chess-polyglot-read-move))))
(chess-polyglot-skip-learn))
moves))))))))
(defconst chess-polyglot-zorbit-hashes
[(2637767806 . 863464769) (720845184 . 95069639) (1155203408 . 610415943)
(2618685246 . 1655139042) (1971536997 . 1218186377) (848342074 . 540017087)
(263957791 . 1627660921) (3896152207 . 4076560586) (226391645 . 1484086288)
(436746274 . 3467632685) (2516964848 . 3797861296) (3491888988 . 3510251221)
(1086189917 . 1248276018) (18044180 . 1876255637) (1572111136 . 1190386149)
(597658413 . 2146900428) (97624494 . 2243205793) (1738507407 . 1854916977)
(1950989311 . 2149575947) (2098318769 . 3283594736) (2194108574 . 2015279052)
(4079062812 . 2500884588) (856979699 . 2941369318) (1270058469 . 3877737539)
(2858720366 . 3170717948) (2378012835 . 1387254795) (2278688587 . 2178388503)
(435406673 . 3555273441) (3031118064 . 1655806655) (2063925420 . 1107589828)
(3376753832 . 436852829) (615148625 . 1302492416) (1285502018 . 1963045959)
(346460119 . 1016137793) (2803604355 . 1176288659) (55085973 . 2968618255)
(1669016372 . 4287873088) (164740250 . 1037634196) (896886403 . 883023163)
(1935551383 . 2764331555) (410153072 . 4055711755) (533441746 . 1505690343)
(3541084098 . 3466290517) (3214426080 . 4267541060) (2675233103 . 1951705124)
(1374411850 . 3115986997) (1552073989 . 3684348154) (4244110986 . 875606593)
(844343081 . 3115990494) (2356462440 . 135999605) (3116133511 . 377238503)
(2129956651 . 2197966368) (299173332 . 3276914047) (1701379241 . 745972291)
(1306570996 . 254977976) (2530644806 . 214138461) (1122123979 . 1667800879)
(1831591130 . 3801192033) (1116211970 . 920967505) (1594837592 . 2551651254)
(972591349 . 2046373768) (2479207924 . 1935030411) (1675376029 . 2367888248)
(3960916618 . 3935874422) (1398143232 . 3265801671) (133930885 . 1520005442)
(1351827834 . 2829577566) (2076951437 . 2723839804) (435980918 . 2364847828)
(1668970368 . 3738157273) (2185864314 . 3993911799) (2041407829 . 31969768)
(346864372 . 2004703094) (4047877822 . 3437142421) (3669961416 . 538399484)
(616810829 . 4190688246) (3144558884 . 4030272234) (216165387 . 2513010905)
(2761740594 . 3216997572) (3919406634 . 4096014649) (669429112 . 2434161727)
(2234904640 . 3111407601) (1421079802 . 1598085235) (1924213810 . 310373675)
(4002762044 . 2067865415) (2592451728 . 2586110625) (1890340057 . 4031717877)
(4189625662 . 2577429954) (2276713138 . 3049850801) (2741429688 . 3310307512)
(2924122950 . 3426712818) (421576781 . 1193704381) (2277442246 . 3030264553)
(153237420 . 595540057) (4278711886 . 4176286928) (2380848297 . 4030514510)
(2618700582 . 1303682185) (3018992701 . 185284845) (957243316 . 1291916363)
(1543415220 . 1898408169) (504378001 . 531073412) (2591337657 . 1692896435)
(1333852064 . 903543556) (1661259930 . 188168388) (561112646 . 2197961224)
(1536910315 . 2632972300) (1349168372 . 2307429186) (411152329 . 2745631190)
(1694697476 . 1081411140) (3755185459 . 2631660711) (4019355068 . 4027326706)
(2066937809 . 3761668332) (3120395808 . 3878773315) (94890149 . 2109283191)
(3045629038 . 358812277) (1249184265 . 3465901047) (3477490924 . 2308583306)
(4114113436 . 3875911716) (1014604031 . 1434513279) (3991324799 . 2222416029)
(2040431088 . 1539915569) (2253613964 . 4081224332) (2547464012 . 1611168627)
(2722521980 . 4281500978) (71289574 . 213969824) (2450408597 . 903689630)
(1894451515 . 364024012) (1939968537 . 374938813) (1447259295 . 3785468557)
(4021046128 . 1664847745) (3139524504 . 3562928047) (1173487682 . 4065269608)
(2467266804 . 3907744866) (4284945151 . 3486998177) (2925674454 . 1953016432)
(3710671816 . 1271453948) (2129465869 . 1422863833) (587093076 . 18243356)
(3373793513 . 2411305257) (2156648078 . 1791034213) (3737413652 . 1534461430)
(468575139 . 2935304962) (1129551363 . 3603256834) (2861996892 . 1763494778)
(2826449619 . 2465197654) (1704209531 . 1014895022) (3738359347 . 3402630390)
(569410928 . 4095796581) (3021312909 . 2108247612) (2444777957 . 2664129360)
(282063667 . 3773661258) (682545472 . 3188439005) (3318488457 . 1917822038)
(1447622272 . 4045023041) (757420137 . 4038580915) (2613420942 . 4146703316)
(4012836163 . 150381244) (2938127093 . 3428591704) (1208226490 . 3086335530)
(2935205706 . 1446903363) (430957978 . 3830532479) (1381578755 . 3757172800)
(4109399782 . 1596778224) (288855589 . 1954372339) (3169178148 . 2256716053)
(2644780093 . 3895892303) (107966643 . 1071681559) (1304747544 . 2607225372)
(1359190711 . 1898207171) (3229237120 . 3273634996) (3027167685 . 3863637628)
(3011615298 . 2883984519) (564135827 . 978463264) (770797430 . 362326607)
(1983662611 . 1907583229) (4153656423 . 48268960) (3609759233 . 720080177)
(3727911466 . 1270989899) (200708787 . 2366086947) (744508026 . 393422515)
(1213261630 . 65757284) (3485747185 . 3845951003) (2958861301 . 1680248217)
(2598470344 . 3163845864) (2767997908 . 4233451722) (3881113485 . 1492930166)
(1773764017 . 2764062206) (4189435844 . 2898689174) (4234838742 . 1267095035)
(2624081078 . 3302114327) (2395569449 . 390426320) (1728307101 . 690284926)
(3309827454 . 1118258254) (2028172868 . 3888829086) (4271523049 . 909051386)
(146617804 . 942892565) (2467685867 . 974297806) (2483428231 . 503635829)
(3743260573 . 2018222096) (1002067894 . 2289153437) (3535252974 . 3738302271)
(4154611160 . 1002664952) (3623154244 . 2349656961) (3646679180 . 3524329383)
(862933752 . 4282853607) (2806008282 . 3272780913) (2734037942 . 3828874677)
(1328176304 . 2137666995) (2278785213 . 2780788825) (381286368 . 1816476193)
(2074232908 . 2316293454) (4087773386 . 3651330956) (967884669 . 3728964514)
(4239349185 . 3213509668) (419231360 . 1463788948) (1275421624 . 2672384707)
(1088456595 . 436245261) (2365565249 . 783696577) (1758083333 . 845223583)
(2048846183 . 3530914274) (2635948261 . 124738415) (940630937 . 3069598626)
(839474029 . 1253439921) (902477345 . 165479306) (2836079689 . 2681188273)
(2007115168 . 2093139645) (1363041891 . 1282466609) (1130479818 . 1063857938)
(3644959908 . 1260430427) (1385135238 . 46497915) (1386975934 . 3110156681)
(2635987502 . 4233461619) (1915744629 . 4117939016) (487743653 . 285736599)
(2049219159 . 3960249250) (69242857 . 3908563670) (1511066720 . 1488527520)
(215590039 . 1703564952) (1459430344 . 4184955468) (676103291 . 2642967214)
(83799035 . 3182827979) (1949179493 . 476101251) (2593534694 . 1493478716)
(2283504289 . 995211746) (1349412676 . 3449243940) (2954378677 . 1878813305)
(249149717 . 3329151870) (1578231917 . 1483986052) (4135085182 . 890874990)
(461755528 . 3505523909) (3669622373 . 634949665) (219487622 . 2914465301)
(2825233742 . 3703631897) (2479105382 . 2935590907) (2582097898 . 3187672881)
(1221328648 . 1843341402) (2140891889 . 3958868911) (1482849818 . 345750049)
(751922730 . 3178831411) (3546542069 . 4036458902) (216179596 . 877293293)
(444615341 . 3117393729) (2424254530 . 494454238) (1344234989 . 3003337991)
(929188581 . 2760877801) (2507911009 . 1879899982) (980166547 . 1311840394)
(3566535507 . 1790747461) (143525013 . 2311336672) (4181962471 . 4273938872)
(1815842366 . 862009811) (911175674 . 1179575598) (3591335374 . 3694215714)
(1452686093 . 3393294272) (385158879 . 2447709103) (4011414929 . 1264623507)
(1448477120 . 911094312) (3971299641 . 2289992053) (3133647265 . 2234591563)
(3007628400 . 964409938) (1708345684 . 3673411261) (3031964479 . 2843021794)
(3022128657 . 2480338599) (118850112 . 473449293) (2048127371 . 3202109429)
(3158349745 . 382018770) (1505327237 . 3807570472) (2568424029 . 3272693060)
(1866609495 . 3888556537) (844703982 . 1852802964) (3504617058 . 682636099)
(1448882679 . 3733580327) (821387540 . 2215744532) (3631471417 . 311618895)
(2077838877 . 2383929020) (3352949096 . 1688694420) (2491080787 . 3998672444)
(3368630402 . 4182204255) (983299419 . 2837414346) (3651215291 . 1033373924)
(265429091 . 3988955082) (3019003608 . 2896212153) (2955948456 . 3025235588)
(903690197 . 2266253487) (3925215275 . 89402958) (3959093811 . 3609545561)
(2455088053 . 223552128) (3115011301 . 2133669107) (1765081558 . 673805649)
(3324795129 . 2111392191) (3443871631 . 432345706) (3152559950 . 3425427147)
(3699649406 . 672784944) (3129545774 . 7668664) (2747044893 . 173040075)
(3925243406 . 852328481) (164095314 . 3161868591) (2234471571 . 1302682825)
(2164784335 . 105893718) (159995093 . 536831360) (599199451 . 425051327)
(3274759746 . 1680930461) (1192619331 . 3903085578) (2832721114 . 3078660237)
(91404660 . 4030521531) (3044880024 . 1578375623) (3906596030 . 754177855)
(803516785 . 1894094672) (288455592 . 2030430096) (2143232492 . 2317305324)
(388352703 . 3406060288) (2521731420 . 3588403719) (1043041227 . 4028028525)
(3195290851 . 2468913324) (4166724431 . 3168683191) (1228226538 . 968516529)
(500177583 . 3444787306) (533367442 . 4252082053) (4236023256 . 657816314)
(413575568 . 3367198397) (3435884549 . 3334062733) (1004255532 . 1135705894)
(2859513268 . 4170618274) (3914086821 . 1251487871) (3080761716 . 3489067886)
(3571165255 . 699353261) (773372954 . 3648014952) (769693293 . 2939128604)
(3116440923 . 507748478) (1687629160 . 3739431776) (2489486648 . 3502376324)
(3686847158 . 2878383449) (3530767427 . 902211375) (2121652637 . 2493976397)
(1827477891 . 930064171) (2549918411 . 4029725732) (2071415163 . 844118802)
(2236083679 . 3088894868) (2040110303 . 4144562891) (3489536313 . 1133419300)
(2190878435 . 2301466071) (2465915458 . 2448602097) (1675766804 . 2073834499)
(3329799896 . 1613253148) (1483966600 . 1348836071) (159505618 . 2527621997)
(2674227354 . 1695130688) (2683539437 . 1927873839) (3833196123 . 2570082188)
(3891433165 . 759819981) (1455453349 . 2179602430) (1430583255 . 1957776111)
(2067726741 . 4235143439) (303380021 . 2998980439) (2136024795 . 3126725799)
(2054591852 . 1051702291) (1029141665 . 489794361) (2317027384 . 569642164)
(2068461795 . 624418658) (2499875684 . 1830645251) (1302894490 . 4319401)
(1002663431 . 2406815191) (1560941298 . 2060652753) (2141002286 . 515773223)
(3661248027 . 475092913) (3705503008 . 2419919909) (914567990 . 3496539911)
(3462935583 . 2039034761) (2878378006 . 2379243316) (1133857586 . 1390159333)
(3023618742 . 2140726761) (282908558 . 944874642) (3686955701 . 1148723903)
(2604456805 . 4163675010) (3061545110 . 377179268) (3218002352 . 76459088)
(2836503392 . 916455101) (536836808 . 151306053) (2886925079 . 404221671)
(2936593041 . 2011015485) (453815187 . 1852163908) (3042568989 . 82176306)
(3279635891 . 4174836410) (3282689058 . 2360003049) (4088968807 . 1516570623)
(2680453086 . 1322680794) (1731693966 . 3438253771) (1842894553 . 1294307894)
(2736377365 . 2964642609) (121205621 . 521330014) (2324595870 . 3005710757)
(3784465521 . 676493813) (1958759409 . 2030833406) (1306150933 . 1016370058)
(2636541290 . 482366508) (1950415745 . 1695073534) (322077955 . 3746046623)
(3602873262 . 3829181504) (1211684447 . 1861645455) (504701736 . 4080111082)
(2407799203 . 1223857855) (1925743434 . 1498920209) (3617596327 . 845198428)
(2498480299 . 3484773806) (2680229135 . 2560201696) (3731399221 . 1536412390)
(2756509305 . 2924710846) (2635957500 . 3459716133) (1372762539 . 769635894)
(802677945 . 3878474636) (1707760534 . 3075809808) (3714687192 . 2872792173)
(1615679922 . 1606381794) (1940556374 . 1337437342) (445390489 . 731124040)
(2864974375 . 64601760) (1984806574 . 2141516710) (513390958 . 1890172555)
(744398315 . 1475299139) (982749166 . 852662657) (652663695 . 4260736510)
(1184061125 . 82616221) (3363191899 . 147951756) (1064069880 . 1507328085)
(2138882964 . 547595589) (2616926846 . 3186935246) (2298715513 . 3606862940)
(2414381911 . 811477686) (2694745228 . 900437726) (4202576185 . 2201114451)
(3602305260 . 3323446937) (3756663274 . 2658490339) (3061587876 . 2171079416)
(3390977925 . 2850497765) (486312941 . 224925241) (3515712841 . 3510684394)
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"Zorbit hashes.")
(defun chess-polyglot-pos-to-key (position)
"Convert a POSITION to a polyglot zorbist hash, a `cons' of 32bit integers."
(cl-assert (vectorp position))
(let ((pieces '(?p ?P ?n ?N ?b ?B ?r ?R ?q ?Q ?k ?K))
(key (cons 0 0)))
(dotimes (rank 8)
(dotimes (file 8)
(let ((piece (cl-position (chess-pos-piece position (chess-rf-to-index
rank file))
pieces)))
(when piece
(let ((piece-key (aref chess-polyglot-zorbit-hashes
(+ (* 64 piece) (* (- 7 rank) 8) file))))
(setcar key (logxor (car key) (car piece-key)))
(setcdr key (logxor (cdr key) (cdr piece-key))))))))
(let ((sides '(?K ?Q ?k ?q)))
(dolist (side sides)
(when (chess-pos-can-castle position side)
(let ((castle-key (aref chess-polyglot-zorbit-hashes
(+ 768 (cl-position side sides)))))
(setcar key (logxor (car key) (car castle-key)))
(setcdr key (logxor (cdr key) (cdr castle-key)))))))
(when (chess-pos-side-to-move position)
(let ((turn-key (aref chess-polyglot-zorbit-hashes 780)))
(setcar key (logxor (car key) (car turn-key)))
(setcdr key (logxor (cdr key) (cdr turn-key)))))
key))
(defun chess-polyglot-book-open (file)
"Open a polyglot book file.
Returns a buffer object which contains the binary data."
(when (file-exists-p file)
(with-current-buffer (get-buffer-create (concat " *chess-polyglot " file "*"))
(erase-buffer)
(set-buffer-multibyte nil)
(insert-file-contents-literally file)
(current-buffer))))
(defun chess-polyglot-book-plies (book position)
"Return a list of plies found in BOOK for POSITION.
The :polyglot-book-weight ply keyword is used to store move weights."
(cl-assert (bufferp book))
(cl-assert (vectorp position))
(let (plies)
(dolist (move
(with-current-buffer book
(chess-polyglot-moves (chess-polyglot-pos-to-key position)))
plies)
(let ((ply (apply #'chess-polyglot-move-to-ply position move)))
(when ply
(setq plies (nconc plies (list ply))))))))
(defalias 'chess-polyglot-book-close 'kill-buffer
"Close a polyglot book.")
(provide 'chess-polyglot)
;;; chess-polyglot.el ends here
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