book.c

   1 /*
   2  * book.c -- code for probing Polyglot opening books
   3  *
   4  * This code was first released in the public domain by Michel Van den Bergh.
   5  * The array Random64 is taken from the Polyglot source code.
   6  * I am pretty sure that a table of random numbers is never protected
   7  * by copyright.
   8  *
   9  * It s adapted by H.G. Muller for working with xboard / Winboard
  10  *
  11  * The following terms apply to the enhanced version of XBoard distributed
  12  * by the Free Software Foundation:
  13  * ------------------------------------------------------------------------
  14  *
  15  * GNU XBoard is free software: you can redistribute it and/or modify
  16  * it under the terms of the GNU General Public License as published by
  17  * the Free Software Foundation, either version 3 of the License, or (at
  18  * your option) any later version.
  19  *
  20  * GNU XBoard is distributed in the hope that it will be useful, but
  21  * WITHOUT ANY WARRANTY; without even the implied warranty of
  22  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  23  * General Public License for more details.
  24  *
  25  * You should have received a copy of the GNU General Public License
  26  * along with this program. If not, see http://www.gnu.org/licenses/.  *
  27  *
  28  * ------------------------------------------------------------------------
  29  */
  30
  31 #include <stdio.h>
  32 #include <string.h>
  33 #include <time.h>
  34 #include <stdlib.h>
  35 #include <math.h>
  36
  37 #include "common.h"
  38 #include "backend.h"
  39 #include "moves.h"
  40 #include "gettext.h"
  41
  42 #ifdef ENABLE_NLS
  43 # define  _(s) gettext (s)
  44 # define N_(s) gettext_noop (s)
  45 #else
  46 # define  _(s) (s)
  47 # define N_(s)  s
  48 #endif
  49
  50 #ifdef _MSC_VER
  51   typedef unsigned __int64 uint64;
  52 #else
  53   typedef unsigned long long int uint64;
  54 #endif
  55
  56 #ifdef _MSC_VER
  57 #  define U64(u) (u##ui64)
  58 #else
  59 #  define U64(u) (u##ULL)
  60 #endif
  61
  62 typedef unsigned char uint8;
  63 typedef unsigned short uint16;
  64 typedef unsigned int uint32;
  65
  66 typedef struct {
  67     uint64 key;
  68     uint16 move;
  69     uint16 weight;
  70     uint16 learnPoints;
  71     uint16 learnCount;
  72 } entry_t;
  73
  74 entry_t entry_none = {
  75     0, 0, 0, 0
  76 };
  77
  78 char *promote_pieces=" nbrqac=";
  79
  80 uint64 Random64[781] = {
  81    U64(0x9D39247E33776D41), U64(0x2AF7398005AAA5C7), U64(0x44DB015024623547), U64(0x9C15F73E62A76AE2),
  82    U64(0x75834465489C0C89), U64(0x3290AC3A203001BF), U64(0x0FBBAD1F61042279), U64(0xE83A908FF2FB60CA),
  83    U64(0x0D7E765D58755C10), U64(0x1A083822CEAFE02D), U64(0x9605D5F0E25EC3B0), U64(0xD021FF5CD13A2ED5),
  84    U64(0x40BDF15D4A672E32), U64(0x011355146FD56395), U64(0x5DB4832046F3D9E5), U64(0x239F8B2D7FF719CC),
  85    U64(0x05D1A1AE85B49AA1), U64(0x679F848F6E8FC971), U64(0x7449BBFF801FED0B), U64(0x7D11CDB1C3B7ADF0),
  86    U64(0x82C7709E781EB7CC), U64(0xF3218F1C9510786C), U64(0x331478F3AF51BBE6), U64(0x4BB38DE5E7219443),
  87    U64(0xAA649C6EBCFD50FC), U64(0x8DBD98A352AFD40B), U64(0x87D2074B81D79217), U64(0x19F3C751D3E92AE1),
  88    U64(0xB4AB30F062B19ABF), U64(0x7B0500AC42047AC4), U64(0xC9452CA81A09D85D), U64(0x24AA6C514DA27500),
  89    U64(0x4C9F34427501B447), U64(0x14A68FD73C910841), U64(0xA71B9B83461CBD93), U64(0x03488B95B0F1850F),
  90    U64(0x637B2B34FF93C040), U64(0x09D1BC9A3DD90A94), U64(0x3575668334A1DD3B), U64(0x735E2B97A4C45A23),
  91    U64(0x18727070F1BD400B), U64(0x1FCBACD259BF02E7), U64(0xD310A7C2CE9B6555), U64(0xBF983FE0FE5D8244),
  92    U64(0x9F74D14F7454A824), U64(0x51EBDC4AB9BA3035), U64(0x5C82C505DB9AB0FA), U64(0xFCF7FE8A3430B241),
  93    U64(0x3253A729B9BA3DDE), U64(0x8C74C368081B3075), U64(0xB9BC6C87167C33E7), U64(0x7EF48F2B83024E20),
  94    U64(0x11D505D4C351BD7F), U64(0x6568FCA92C76A243), U64(0x4DE0B0F40F32A7B8), U64(0x96D693460CC37E5D),
  95    U64(0x42E240CB63689F2F), U64(0x6D2BDCDAE2919661), U64(0x42880B0236E4D951), U64(0x5F0F4A5898171BB6),
  96    U64(0x39F890F579F92F88), U64(0x93C5B5F47356388B), U64(0x63DC359D8D231B78), U64(0xEC16CA8AEA98AD76),
  97    U64(0x5355F900C2A82DC7), U64(0x07FB9F855A997142), U64(0x5093417AA8A7ED5E), U64(0x7BCBC38DA25A7F3C),
  98    U64(0x19FC8A768CF4B6D4), U64(0x637A7780DECFC0D9), U64(0x8249A47AEE0E41F7), U64(0x79AD695501E7D1E8),
  99    U64(0x14ACBAF4777D5776), U64(0xF145B6BECCDEA195), U64(0xDABF2AC8201752FC), U64(0x24C3C94DF9C8D3F6),
 100    U64(0xBB6E2924F03912EA), U64(0x0CE26C0B95C980D9), U64(0xA49CD132BFBF7CC4), U64(0xE99D662AF4243939),
 101    U64(0x27E6AD7891165C3F), U64(0x8535F040B9744FF1), U64(0x54B3F4FA5F40D873), U64(0x72B12C32127FED2B),
 102    U64(0xEE954D3C7B411F47), U64(0x9A85AC909A24EAA1), U64(0x70AC4CD9F04F21F5), U64(0xF9B89D3E99A075C2),
 103    U64(0x87B3E2B2B5C907B1), U64(0xA366E5B8C54F48B8), U64(0xAE4A9346CC3F7CF2), U64(0x1920C04D47267BBD),
 104    U64(0x87BF02C6B49E2AE9), U64(0x092237AC237F3859), U64(0xFF07F64EF8ED14D0), U64(0x8DE8DCA9F03CC54E),
 105    U64(0x9C1633264DB49C89), U64(0xB3F22C3D0B0B38ED), U64(0x390E5FB44D01144B), U64(0x5BFEA5B4712768E9),
 106    U64(0x1E1032911FA78984), U64(0x9A74ACB964E78CB3), U64(0x4F80F7A035DAFB04), U64(0x6304D09A0B3738C4),
 107    U64(0x2171E64683023A08), U64(0x5B9B63EB9CEFF80C), U64(0x506AACF489889342), U64(0x1881AFC9A3A701D6),
 108    U64(0x6503080440750644), U64(0xDFD395339CDBF4A7), U64(0xEF927DBCF00C20F2), U64(0x7B32F7D1E03680EC),
 109    U64(0xB9FD7620E7316243), U64(0x05A7E8A57DB91B77), U64(0xB5889C6E15630A75), U64(0x4A750A09CE9573F7),
 110    U64(0xCF464CEC899A2F8A), U64(0xF538639CE705B824), U64(0x3C79A0FF5580EF7F), U64(0xEDE6C87F8477609D),
 111    U64(0x799E81F05BC93F31), U64(0x86536B8CF3428A8C), U64(0x97D7374C60087B73), U64(0xA246637CFF328532),
 112    U64(0x043FCAE60CC0EBA0), U64(0x920E449535DD359E), U64(0x70EB093B15B290CC), U64(0x73A1921916591CBD),
 113    U64(0x56436C9FE1A1AA8D), U64(0xEFAC4B70633B8F81), U64(0xBB215798D45DF7AF), U64(0x45F20042F24F1768),
 114    U64(0x930F80F4E8EB7462), U64(0xFF6712FFCFD75EA1), U64(0xAE623FD67468AA70), U64(0xDD2C5BC84BC8D8FC),
 115    U64(0x7EED120D54CF2DD9), U64(0x22FE545401165F1C), U64(0xC91800E98FB99929), U64(0x808BD68E6AC10365),
 116    U64(0xDEC468145B7605F6), U64(0x1BEDE3A3AEF53302), U64(0x43539603D6C55602), U64(0xAA969B5C691CCB7A),
 117    U64(0xA87832D392EFEE56), U64(0x65942C7B3C7E11AE), U64(0xDED2D633CAD004F6), U64(0x21F08570F420E565),
 118    U64(0xB415938D7DA94E3C), U64(0x91B859E59ECB6350), U64(0x10CFF333E0ED804A), U64(0x28AED140BE0BB7DD),
 119    U64(0xC5CC1D89724FA456), U64(0x5648F680F11A2741), U64(0x2D255069F0B7DAB3), U64(0x9BC5A38EF729ABD4),
 120    U64(0xEF2F054308F6A2BC), U64(0xAF2042F5CC5C2858), U64(0x480412BAB7F5BE2A), U64(0xAEF3AF4A563DFE43),
 121    U64(0x19AFE59AE451497F), U64(0x52593803DFF1E840), U64(0xF4F076E65F2CE6F0), U64(0x11379625747D5AF3),
 122    U64(0xBCE5D2248682C115), U64(0x9DA4243DE836994F), U64(0x066F70B33FE09017), U64(0x4DC4DE189B671A1C),
 123    U64(0x51039AB7712457C3), U64(0xC07A3F80C31FB4B4), U64(0xB46EE9C5E64A6E7C), U64(0xB3819A42ABE61C87),
 124    U64(0x21A007933A522A20), U64(0x2DF16F761598AA4F), U64(0x763C4A1371B368FD), U64(0xF793C46702E086A0),
 125    U64(0xD7288E012AEB8D31), U64(0xDE336A2A4BC1C44B), U64(0x0BF692B38D079F23), U64(0x2C604A7A177326B3),
 126    U64(0x4850E73E03EB6064), U64(0xCFC447F1E53C8E1B), U64(0xB05CA3F564268D99), U64(0x9AE182C8BC9474E8),
 127    U64(0xA4FC4BD4FC5558CA), U64(0xE755178D58FC4E76), U64(0x69B97DB1A4C03DFE), U64(0xF9B5B7C4ACC67C96),
 128    U64(0xFC6A82D64B8655FB), U64(0x9C684CB6C4D24417), U64(0x8EC97D2917456ED0), U64(0x6703DF9D2924E97E),
 129    U64(0xC547F57E42A7444E), U64(0x78E37644E7CAD29E), U64(0xFE9A44E9362F05FA), U64(0x08BD35CC38336615),
 130    U64(0x9315E5EB3A129ACE), U64(0x94061B871E04DF75), U64(0xDF1D9F9D784BA010), U64(0x3BBA57B68871B59D),
 131    U64(0xD2B7ADEEDED1F73F), U64(0xF7A255D83BC373F8), U64(0xD7F4F2448C0CEB81), U64(0xD95BE88CD210FFA7),
 132    U64(0x336F52F8FF4728E7), U64(0xA74049DAC312AC71), U64(0xA2F61BB6E437FDB5), U64(0x4F2A5CB07F6A35B3),
 133    U64(0x87D380BDA5BF7859), U64(0x16B9F7E06C453A21), U64(0x7BA2484C8A0FD54E), U64(0xF3A678CAD9A2E38C),
 134    U64(0x39B0BF7DDE437BA2), U64(0xFCAF55C1BF8A4424), U64(0x18FCF680573FA594), U64(0x4C0563B89F495AC3),
 135    U64(0x40E087931A00930D), U64(0x8CFFA9412EB642C1), U64(0x68CA39053261169F), U64(0x7A1EE967D27579E2),
 136    U64(0x9D1D60E5076F5B6F), U64(0x3810E399B6F65BA2), U64(0x32095B6D4AB5F9B1), U64(0x35CAB62109DD038A),
 137    U64(0xA90B24499FCFAFB1), U64(0x77A225A07CC2C6BD), U64(0x513E5E634C70E331), U64(0x4361C0CA3F692F12),
 138    U64(0xD941ACA44B20A45B), U64(0x528F7C8602C5807B), U64(0x52AB92BEB9613989), U64(0x9D1DFA2EFC557F73),
 139    U64(0x722FF175F572C348), U64(0x1D1260A51107FE97), U64(0x7A249A57EC0C9BA2), U64(0x04208FE9E8F7F2D6),
 140    U64(0x5A110C6058B920A0), U64(0x0CD9A497658A5698), U64(0x56FD23C8F9715A4C), U64(0x284C847B9D887AAE),
 141    U64(0x04FEABFBBDB619CB), U64(0x742E1E651C60BA83), U64(0x9A9632E65904AD3C), U64(0x881B82A13B51B9E2),
 142    U64(0x506E6744CD974924), U64(0xB0183DB56FFC6A79), U64(0x0ED9B915C66ED37E), U64(0x5E11E86D5873D484),
 143    U64(0xF678647E3519AC6E), U64(0x1B85D488D0F20CC5), U64(0xDAB9FE6525D89021), U64(0x0D151D86ADB73615),
 144    U64(0xA865A54EDCC0F019), U64(0x93C42566AEF98FFB), U64(0x99E7AFEABE000731), U64(0x48CBFF086DDF285A),
 145    U64(0x7F9B6AF1EBF78BAF), U64(0x58627E1A149BBA21), U64(0x2CD16E2ABD791E33), U64(0xD363EFF5F0977996),
 146    U64(0x0CE2A38C344A6EED), U64(0x1A804AADB9CFA741), U64(0x907F30421D78C5DE), U64(0x501F65EDB3034D07),
 147    U64(0x37624AE5A48FA6E9), U64(0x957BAF61700CFF4E), U64(0x3A6C27934E31188A), U64(0xD49503536ABCA345),
 148    U64(0x088E049589C432E0), U64(0xF943AEE7FEBF21B8), U64(0x6C3B8E3E336139D3), U64(0x364F6FFA464EE52E),
 149    U64(0xD60F6DCEDC314222), U64(0x56963B0DCA418FC0), U64(0x16F50EDF91E513AF), U64(0xEF1955914B609F93),
 150    U64(0x565601C0364E3228), U64(0xECB53939887E8175), U64(0xBAC7A9A18531294B), U64(0xB344C470397BBA52),
 151    U64(0x65D34954DAF3CEBD), U64(0xB4B81B3FA97511E2), U64(0xB422061193D6F6A7), U64(0x071582401C38434D),
 152    U64(0x7A13F18BBEDC4FF5), U64(0xBC4097B116C524D2), U64(0x59B97885E2F2EA28), U64(0x99170A5DC3115544),
 153    U64(0x6F423357E7C6A9F9), U64(0x325928EE6E6F8794), U64(0xD0E4366228B03343), U64(0x565C31F7DE89EA27),
 154    U64(0x30F5611484119414), U64(0xD873DB391292ED4F), U64(0x7BD94E1D8E17DEBC), U64(0xC7D9F16864A76E94),
 155    U64(0x947AE053EE56E63C), U64(0xC8C93882F9475F5F), U64(0x3A9BF55BA91F81CA), U64(0xD9A11FBB3D9808E4),
 156    U64(0x0FD22063EDC29FCA), U64(0xB3F256D8ACA0B0B9), U64(0xB03031A8B4516E84), U64(0x35DD37D5871448AF),
 157    U64(0xE9F6082B05542E4E), U64(0xEBFAFA33D7254B59), U64(0x9255ABB50D532280), U64(0xB9AB4CE57F2D34F3),
 158    U64(0x693501D628297551), U64(0xC62C58F97DD949BF), U64(0xCD454F8F19C5126A), U64(0xBBE83F4ECC2BDECB),
 159    U64(0xDC842B7E2819E230), U64(0xBA89142E007503B8), U64(0xA3BC941D0A5061CB), U64(0xE9F6760E32CD8021),
 160    U64(0x09C7E552BC76492F), U64(0x852F54934DA55CC9), U64(0x8107FCCF064FCF56), U64(0x098954D51FFF6580),
 161    U64(0x23B70EDB1955C4BF), U64(0xC330DE426430F69D), U64(0x4715ED43E8A45C0A), U64(0xA8D7E4DAB780A08D),
 162    U64(0x0572B974F03CE0BB), U64(0xB57D2E985E1419C7), U64(0xE8D9ECBE2CF3D73F), U64(0x2FE4B17170E59750),
 163    U64(0x11317BA87905E790), U64(0x7FBF21EC8A1F45EC), U64(0x1725CABFCB045B00), U64(0x964E915CD5E2B207),
 164    U64(0x3E2B8BCBF016D66D), U64(0xBE7444E39328A0AC), U64(0xF85B2B4FBCDE44B7), U64(0x49353FEA39BA63B1),
 165    U64(0x1DD01AAFCD53486A), U64(0x1FCA8A92FD719F85), U64(0xFC7C95D827357AFA), U64(0x18A6A990C8B35EBD),
 166    U64(0xCCCB7005C6B9C28D), U64(0x3BDBB92C43B17F26), U64(0xAA70B5B4F89695A2), U64(0xE94C39A54A98307F),
 167    U64(0xB7A0B174CFF6F36E), U64(0xD4DBA84729AF48AD), U64(0x2E18BC1AD9704A68), U64(0x2DE0966DAF2F8B1C),
 168    U64(0xB9C11D5B1E43A07E), U64(0x64972D68DEE33360), U64(0x94628D38D0C20584), U64(0xDBC0D2B6AB90A559),
 169    U64(0xD2733C4335C6A72F), U64(0x7E75D99D94A70F4D), U64(0x6CED1983376FA72B), U64(0x97FCAACBF030BC24),
 170    U64(0x7B77497B32503B12), U64(0x8547EDDFB81CCB94), U64(0x79999CDFF70902CB), U64(0xCFFE1939438E9B24),
 171    U64(0x829626E3892D95D7), U64(0x92FAE24291F2B3F1), U64(0x63E22C147B9C3403), U64(0xC678B6D860284A1C),
 172    U64(0x5873888850659AE7), U64(0x0981DCD296A8736D), U64(0x9F65789A6509A440), U64(0x9FF38FED72E9052F),
 173    U64(0xE479EE5B9930578C), U64(0xE7F28ECD2D49EECD), U64(0x56C074A581EA17FE), U64(0x5544F7D774B14AEF),
 174    U64(0x7B3F0195FC6F290F), U64(0x12153635B2C0CF57), U64(0x7F5126DBBA5E0CA7), U64(0x7A76956C3EAFB413),
 175    U64(0x3D5774A11D31AB39), U64(0x8A1B083821F40CB4), U64(0x7B4A38E32537DF62), U64(0x950113646D1D6E03),
 176    U64(0x4DA8979A0041E8A9), U64(0x3BC36E078F7515D7), U64(0x5D0A12F27AD310D1), U64(0x7F9D1A2E1EBE1327),
 177    U64(0xDA3A361B1C5157B1), U64(0xDCDD7D20903D0C25), U64(0x36833336D068F707), U64(0xCE68341F79893389),
 178    U64(0xAB9090168DD05F34), U64(0x43954B3252DC25E5), U64(0xB438C2B67F98E5E9), U64(0x10DCD78E3851A492),
 179    U64(0xDBC27AB5447822BF), U64(0x9B3CDB65F82CA382), U64(0xB67B7896167B4C84), U64(0xBFCED1B0048EAC50),
 180    U64(0xA9119B60369FFEBD), U64(0x1FFF7AC80904BF45), U64(0xAC12FB171817EEE7), U64(0xAF08DA9177DDA93D),
 181    U64(0x1B0CAB936E65C744), U64(0xB559EB1D04E5E932), U64(0xC37B45B3F8D6F2BA), U64(0xC3A9DC228CAAC9E9),
 182    U64(0xF3B8B6675A6507FF), U64(0x9FC477DE4ED681DA), U64(0x67378D8ECCEF96CB), U64(0x6DD856D94D259236),
 183    U64(0xA319CE15B0B4DB31), U64(0x073973751F12DD5E), U64(0x8A8E849EB32781A5), U64(0xE1925C71285279F5),
 184    U64(0x74C04BF1790C0EFE), U64(0x4DDA48153C94938A), U64(0x9D266D6A1CC0542C), U64(0x7440FB816508C4FE),
 185    U64(0x13328503DF48229F), U64(0xD6BF7BAEE43CAC40), U64(0x4838D65F6EF6748F), U64(0x1E152328F3318DEA),
 186    U64(0x8F8419A348F296BF), U64(0x72C8834A5957B511), U64(0xD7A023A73260B45C), U64(0x94EBC8ABCFB56DAE),
 187    U64(0x9FC10D0F989993E0), U64(0xDE68A2355B93CAE6), U64(0xA44CFE79AE538BBE), U64(0x9D1D84FCCE371425),
 188    U64(0x51D2B1AB2DDFB636), U64(0x2FD7E4B9E72CD38C), U64(0x65CA5B96B7552210), U64(0xDD69A0D8AB3B546D),
 189    U64(0x604D51B25FBF70E2), U64(0x73AA8A564FB7AC9E), U64(0x1A8C1E992B941148), U64(0xAAC40A2703D9BEA0),
 190    U64(0x764DBEAE7FA4F3A6), U64(0x1E99B96E70A9BE8B), U64(0x2C5E9DEB57EF4743), U64(0x3A938FEE32D29981),
 191    U64(0x26E6DB8FFDF5ADFE), U64(0x469356C504EC9F9D), U64(0xC8763C5B08D1908C), U64(0x3F6C6AF859D80055),
 192    U64(0x7F7CC39420A3A545), U64(0x9BFB227EBDF4C5CE), U64(0x89039D79D6FC5C5C), U64(0x8FE88B57305E2AB6),
 193    U64(0xA09E8C8C35AB96DE), U64(0xFA7E393983325753), U64(0xD6B6D0ECC617C699), U64(0xDFEA21EA9E7557E3),
 194    U64(0xB67C1FA481680AF8), U64(0xCA1E3785A9E724E5), U64(0x1CFC8BED0D681639), U64(0xD18D8549D140CAEA),
 195    U64(0x4ED0FE7E9DC91335), U64(0xE4DBF0634473F5D2), U64(0x1761F93A44D5AEFE), U64(0x53898E4C3910DA55),
 196    U64(0x734DE8181F6EC39A), U64(0x2680B122BAA28D97), U64(0x298AF231C85BAFAB), U64(0x7983EED3740847D5),
 197    U64(0x66C1A2A1A60CD889), U64(0x9E17E49642A3E4C1), U64(0xEDB454E7BADC0805), U64(0x50B704CAB602C329),
 198    U64(0x4CC317FB9CDDD023), U64(0x66B4835D9EAFEA22), U64(0x219B97E26FFC81BD), U64(0x261E4E4C0A333A9D),
 199    U64(0x1FE2CCA76517DB90), U64(0xD7504DFA8816EDBB), U64(0xB9571FA04DC089C8), U64(0x1DDC0325259B27DE),
 200    U64(0xCF3F4688801EB9AA), U64(0xF4F5D05C10CAB243), U64(0x38B6525C21A42B0E), U64(0x36F60E2BA4FA6800),
 201    U64(0xEB3593803173E0CE), U64(0x9C4CD6257C5A3603), U64(0xAF0C317D32ADAA8A), U64(0x258E5A80C7204C4B),
 202    U64(0x8B889D624D44885D), U64(0xF4D14597E660F855), U64(0xD4347F66EC8941C3), U64(0xE699ED85B0DFB40D),
 203    U64(0x2472F6207C2D0484), U64(0xC2A1E7B5B459AEB5), U64(0xAB4F6451CC1D45EC), U64(0x63767572AE3D6174),
 204    U64(0xA59E0BD101731A28), U64(0x116D0016CB948F09), U64(0x2CF9C8CA052F6E9F), U64(0x0B090A7560A968E3),
 205    U64(0xABEEDDB2DDE06FF1), U64(0x58EFC10B06A2068D), U64(0xC6E57A78FBD986E0), U64(0x2EAB8CA63CE802D7),
 206    U64(0x14A195640116F336), U64(0x7C0828DD624EC390), U64(0xD74BBE77E6116AC7), U64(0x804456AF10F5FB53),
 207    U64(0xEBE9EA2ADF4321C7), U64(0x03219A39EE587A30), U64(0x49787FEF17AF9924), U64(0xA1E9300CD8520548),
 208    U64(0x5B45E522E4B1B4EF), U64(0xB49C3B3995091A36), U64(0xD4490AD526F14431), U64(0x12A8F216AF9418C2),
 209    U64(0x001F837CC7350524), U64(0x1877B51E57A764D5), U64(0xA2853B80F17F58EE), U64(0x993E1DE72D36D310),
 210    U64(0xB3598080CE64A656), U64(0x252F59CF0D9F04BB), U64(0xD23C8E176D113600), U64(0x1BDA0492E7E4586E),
 211    U64(0x21E0BD5026C619BF), U64(0x3B097ADAF088F94E), U64(0x8D14DEDB30BE846E), U64(0xF95CFFA23AF5F6F4),
 212    U64(0x3871700761B3F743), U64(0xCA672B91E9E4FA16), U64(0x64C8E531BFF53B55), U64(0x241260ED4AD1E87D),
 213    U64(0x106C09B972D2E822), U64(0x7FBA195410E5CA30), U64(0x7884D9BC6CB569D8), U64(0x0647DFEDCD894A29),
 214    U64(0x63573FF03E224774), U64(0x4FC8E9560F91B123), U64(0x1DB956E450275779), U64(0xB8D91274B9E9D4FB),
 215    U64(0xA2EBEE47E2FBFCE1), U64(0xD9F1F30CCD97FB09), U64(0xEFED53D75FD64E6B), U64(0x2E6D02C36017F67F),
 216    U64(0xA9AA4D20DB084E9B), U64(0xB64BE8D8B25396C1), U64(0x70CB6AF7C2D5BCF0), U64(0x98F076A4F7A2322E),
 217    U64(0xBF84470805E69B5F), U64(0x94C3251F06F90CF3), U64(0x3E003E616A6591E9), U64(0xB925A6CD0421AFF3),
 218    U64(0x61BDD1307C66E300), U64(0xBF8D5108E27E0D48), U64(0x240AB57A8B888B20), U64(0xFC87614BAF287E07),
 219    U64(0xEF02CDD06FFDB432), U64(0xA1082C0466DF6C0A), U64(0x8215E577001332C8), U64(0xD39BB9C3A48DB6CF),
 220    U64(0x2738259634305C14), U64(0x61CF4F94C97DF93D), U64(0x1B6BACA2AE4E125B), U64(0x758F450C88572E0B),
 221    U64(0x959F587D507A8359), U64(0xB063E962E045F54D), U64(0x60E8ED72C0DFF5D1), U64(0x7B64978555326F9F),
 222    U64(0xFD080D236DA814BA), U64(0x8C90FD9B083F4558), U64(0x106F72FE81E2C590), U64(0x7976033A39F7D952),
 223    U64(0xA4EC0132764CA04B), U64(0x733EA705FAE4FA77), U64(0xB4D8F77BC3E56167), U64(0x9E21F4F903B33FD9),
 224    U64(0x9D765E419FB69F6D), U64(0xD30C088BA61EA5EF), U64(0x5D94337FBFAF7F5B), U64(0x1A4E4822EB4D7A59),
 225    U64(0x6FFE73E81B637FB3), U64(0xDDF957BC36D8B9CA), U64(0x64D0E29EEA8838B3), U64(0x08DD9BDFD96B9F63),
 226    U64(0x087E79E5A57D1D13), U64(0xE328E230E3E2B3FB), U64(0x1C2559E30F0946BE), U64(0x720BF5F26F4D2EAA),
 227    U64(0xB0774D261CC609DB), U64(0x443F64EC5A371195), U64(0x4112CF68649A260E), U64(0xD813F2FAB7F5C5CA),
 228    U64(0x660D3257380841EE), U64(0x59AC2C7873F910A3), U64(0xE846963877671A17), U64(0x93B633ABFA3469F8),
 229    U64(0xC0C0F5A60EF4CDCF), U64(0xCAF21ECD4377B28C), U64(0x57277707199B8175), U64(0x506C11B9D90E8B1D),
 230    U64(0xD83CC2687A19255F), U64(0x4A29C6465A314CD1), U64(0xED2DF21216235097), U64(0xB5635C95FF7296E2),
 231    U64(0x22AF003AB672E811), U64(0x52E762596BF68235), U64(0x9AEBA33AC6ECC6B0), U64(0x944F6DE09134DFB6),
 232    U64(0x6C47BEC883A7DE39), U64(0x6AD047C430A12104), U64(0xA5B1CFDBA0AB4067), U64(0x7C45D833AFF07862),
 233    U64(0x5092EF950A16DA0B), U64(0x9338E69C052B8E7B), U64(0x455A4B4CFE30E3F5), U64(0x6B02E63195AD0CF8),
 234    U64(0x6B17B224BAD6BF27), U64(0xD1E0CCD25BB9C169), U64(0xDE0C89A556B9AE70), U64(0x50065E535A213CF6),
 235    U64(0x9C1169FA2777B874), U64(0x78EDEFD694AF1EED), U64(0x6DC93D9526A50E68), U64(0xEE97F453F06791ED),
 236    U64(0x32AB0EDB696703D3), U64(0x3A6853C7E70757A7), U64(0x31865CED6120F37D), U64(0x67FEF95D92607890),
 237    U64(0x1F2B1D1F15F6DC9C), U64(0xB69E38A8965C6B65), U64(0xAA9119FF184CCCF4), U64(0xF43C732873F24C13),
 238    U64(0xFB4A3D794A9A80D2), U64(0x3550C2321FD6109C), U64(0x371F77E76BB8417E), U64(0x6BFA9AAE5EC05779),
 239    U64(0xCD04F3FF001A4778), U64(0xE3273522064480CA), U64(0x9F91508BFFCFC14A), U64(0x049A7F41061A9E60),
 240    U64(0xFCB6BE43A9F2FE9B), U64(0x08DE8A1C7797DA9B), U64(0x8F9887E6078735A1), U64(0xB5B4071DBFC73A66),
 241    U64(0x230E343DFBA08D33), U64(0x43ED7F5A0FAE657D), U64(0x3A88A0FBBCB05C63), U64(0x21874B8B4D2DBC4F),
 242    U64(0x1BDEA12E35F6A8C9), U64(0x53C065C6C8E63528), U64(0xE34A1D250E7A8D6B), U64(0xD6B04D3B7651DD7E),
 243    U64(0x5E90277E7CB39E2D), U64(0x2C046F22062DC67D), U64(0xB10BB459132D0A26), U64(0x3FA9DDFB67E2F199),
 244    U64(0x0E09B88E1914F7AF), U64(0x10E8B35AF3EEAB37), U64(0x9EEDECA8E272B933), U64(0xD4C718BC4AE8AE5F),
 245    U64(0x81536D601170FC20), U64(0x91B534F885818A06), U64(0xEC8177F83F900978), U64(0x190E714FADA5156E),
 246    U64(0xB592BF39B0364963), U64(0x89C350C893AE7DC1), U64(0xAC042E70F8B383F2), U64(0xB49B52E587A1EE60),
 247    U64(0xFB152FE3FF26DA89), U64(0x3E666E6F69AE2C15), U64(0x3B544EBE544C19F9), U64(0xE805A1E290CF2456),
 248    U64(0x24B33C9D7ED25117), U64(0xE74733427B72F0C1), U64(0x0A804D18B7097475), U64(0x57E3306D881EDB4F),
 249    U64(0x4AE7D6A36EB5DBCB), U64(0x2D8D5432157064C8), U64(0xD1E649DE1E7F268B), U64(0x8A328A1CEDFE552C),
 250    U64(0x07A3AEC79624C7DA), U64(0x84547DDC3E203C94), U64(0x990A98FD5071D263), U64(0x1A4FF12616EEFC89),
 251    U64(0xF6F7FD1431714200), U64(0x30C05B1BA332F41C), U64(0x8D2636B81555A786), U64(0x46C9FEB55D120902),
 252    U64(0xCCEC0A73B49C9921), U64(0x4E9D2827355FC492), U64(0x19EBB029435DCB0F), U64(0x4659D2B743848A2C),
 253    U64(0x963EF2C96B33BE31), U64(0x74F85198B05A2E7D), U64(0x5A0F544DD2B1FB18), U64(0x03727073C2E134B1),
 254    U64(0xC7F6AA2DE59AEA61), U64(0x352787BAA0D7C22F), U64(0x9853EAB63B5E0B35), U64(0xABBDCDD7ED5C0860),
 255    U64(0xCF05DAF5AC8D77B0), U64(0x49CAD48CEBF4A71E), U64(0x7A4C10EC2158C4A6), U64(0xD9E92AA246BF719E),
 256    U64(0x13AE978D09FE5557), U64(0x730499AF921549FF), U64(0x4E4B705B92903BA4), U64(0xFF577222C14F0A3A),
 257    U64(0x55B6344CF97AAFAE), U64(0xB862225B055B6960), U64(0xCAC09AFBDDD2CDB4), U64(0xDAF8E9829FE96B5F),
 258    U64(0xB5FDFC5D3132C498), U64(0x310CB380DB6F7503), U64(0xE87FBB46217A360E), U64(0x2102AE466EBB1148),
 259    U64(0xF8549E1A3AA5E00D), U64(0x07A69AFDCC42261A), U64(0xC4C118BFE78FEAAE), U64(0xF9F4892ED96BD438),
 260    U64(0x1AF3DBE25D8F45DA), U64(0xF5B4B0B0D2DEEEB4), U64(0x962ACEEFA82E1C84), U64(0x046E3ECAAF453CE9),
 261    U64(0xF05D129681949A4C), U64(0x964781CE734B3C84), U64(0x9C2ED44081CE5FBD), U64(0x522E23F3925E319E),
 262    U64(0x177E00F9FC32F791), U64(0x2BC60A63A6F3B3F2), U64(0x222BBFAE61725606), U64(0x486289DDCC3D6780),
 263    U64(0x7DC7785B8EFDFC80), U64(0x8AF38731C02BA980), U64(0x1FAB64EA29A2DDF7), U64(0xE4D9429322CD065A),
 264    U64(0x9DA058C67844F20C), U64(0x24C0E332B70019B0), U64(0x233003B5A6CFE6AD), U64(0xD586BD01C5C217F6),
 265    U64(0x5E5637885F29BC2B), U64(0x7EBA726D8C94094B), U64(0x0A56A5F0BFE39272), U64(0xD79476A84EE20D06),
 266    U64(0x9E4C1269BAA4BF37), U64(0x17EFEE45B0DEE640), U64(0x1D95B0A5FCF90BC6), U64(0x93CBE0B699C2585D),
 267    U64(0x65FA4F227A2B6D79), U64(0xD5F9E858292504D5), U64(0xC2B5A03F71471A6F), U64(0x59300222B4561E00),
 268    U64(0xCE2F8642CA0712DC), U64(0x7CA9723FBB2E8988), U64(0x2785338347F2BA08), U64(0xC61BB3A141E50E8C),
 269    U64(0x150F361DAB9DEC26), U64(0x9F6A419D382595F4), U64(0x64A53DC924FE7AC9), U64(0x142DE49FFF7A7C3D),
 270    U64(0x0C335248857FA9E7), U64(0x0A9C32D5EAE45305), U64(0xE6C42178C4BBB92E), U64(0x71F1CE2490D20B07),
 271    U64(0xF1BCC3D275AFE51A), U64(0xE728E8C83C334074), U64(0x96FBF83A12884624), U64(0x81A1549FD6573DA5),
 272    U64(0x5FA7867CAF35E149), U64(0x56986E2EF3ED091B), U64(0x917F1DD5F8886C61), U64(0xD20D8C88C8FFE65F),
 273    U64(0x31D71DCE64B2C310), U64(0xF165B587DF898190), U64(0xA57E6339DD2CF3A0), U64(0x1EF6E6DBB1961EC9),
 274    U64(0x70CC73D90BC26E24), U64(0xE21A6B35DF0C3AD7), U64(0x003A93D8B2806962), U64(0x1C99DED33CB890A1),
 275    U64(0xCF3145DE0ADD4289), U64(0xD0E4427A5514FB72), U64(0x77C621CC9FB3A483), U64(0x67A34DAC4356550B),
 276    U64(0xF8D626AAAF278509),
 277 };
 278
 279 uint64 *RandomPiece     =Random64;
 280 uint64 *RandomCastle    =Random64+768;
 281 uint64 *RandomEnPassant =Random64+772;
 282 uint64 *RandomTurn      =Random64+780;
 283
 284
 285 uint64
 286 hash (int moveNr)
 287 {
 288     int r, f, p_enc, squareNr, pieceGroup;
 289     uint64 key=0, holdingsKey=0, Zobrist;
 290     VariantClass v = gameInfo.variant;
 291
 292     switch(v) {
 293         case VariantNormal:
 294         case VariantFischeRandom: // compatible with normal
 295         case VariantNoCastle:
 296         case VariantXiangqi: // for historic reasons; does never collide anyway because of other King type
 297             break;
 298         case VariantGiveaway: // in opening same as suicide
 299             key += VariantSuicide;
 300             break;
 301         case VariantGothic: // these are special cases of CRC, and can share book
 302         case VariantCapablanca:
 303             v = VariantCapaRandom;
 304         default:
 305             key += v; // variant type incorporated in key to allow mixed books without collisions
 306     }
 307
 308     for(f=0; f<BOARD_WIDTH; f++){
 309         for(r=0; r<BOARD_HEIGHT;r++){
 310             ChessSquare p = boards[moveNr][r][f];
 311             if(f == BOARD_LEFT-1 || f == BOARD_RGHT) continue; // between board and holdings
 312             if(p != EmptySquare){
 313                     int j = (int)p;
 314                     j -= (j >= (int)BlackPawn) ? (int)BlackPawn :(int)WhitePawn;
 315                     if(j > (int)WhiteQueen) j++;  // make space for King
 316                     if(j > (int) WhiteKing) j = (int)WhiteQueen + 1;
 317                     p_enc = 2*j + ((int)p < (int)BlackPawn);
 318                     // holdings squares get nmbers immediately after board; first left, then right holdings
 319                     if(f == BOARD_LEFT-2) squareNr = (BOARD_RGHT - BOARD_LEFT)*BOARD_HEIGHT + r; else
 320                     if(f == BOARD_RGHT+1) squareNr = (BOARD_RGHT - BOARD_LEFT + 1)*BOARD_HEIGHT + r; else
 321                     squareNr = (BOARD_RGHT - BOARD_LEFT)*r + (f - BOARD_LEFT);
 322                     // note that in normal Chess squareNr < 64 and p_enc < 12. The following code
 323                     // maps other pieces and squares in this range, and then modify the corresponding
 324                     // Zobrist random by rotating its bitpattern according to what the piece really was.
 325                     pieceGroup = p_enc / 12;
 326                     p_enc      = p_enc % 12;
 327                     Zobrist = RandomPiece[64*p_enc + (squareNr & 63)];
 328                     switch(pieceGroup) {
 329                         case 1: // pieces 5-10 (FEACWM)
 330                                 Zobrist = (Zobrist << 16) ^ (Zobrist >> 48);
 331                                 break;
 332                         case 2: // pieces 11-16 (OHIJGD)
 333                                 Zobrist = (Zobrist << 32) ^ (Zobrist >> 32);
 334                                 break;
 335                         case 3: // pieces 17-20 (VLSU)
 336                                 Zobrist = (Zobrist << 48) ^ (Zobrist >> 16);
 337                                 break;
 338                     }
 339                     if(squareNr >= 64) Zobrist = (Zobrist << 8) ^ (Zobrist >> 56);
 340                     // holdings have separate (additive) key, to encode presence of multiple pieces on same square
 341                     if(f == BOARD_LEFT-2) holdingsKey += Zobrist * boards[moveNr][r][f+1]; else
 342                     if(f == BOARD_RGHT+1) holdingsKey += Zobrist * boards[moveNr][r][f-1]; else
 343                 key ^= Zobrist;
 344             }
 345         }
 346     }
 347
 348     if(boards[moveNr][CASTLING][2] != NoRights) {
 349         if(boards[moveNr][CASTLING][0] != NoRights) key^=RandomCastle[0];
 350         if(boards[moveNr][CASTLING][1] != NoRights) key^=RandomCastle[1];
 351     }
 352     if(boards[moveNr][CASTLING][5] != NoRights) {
 353         if(boards[moveNr][CASTLING][3] != NoRights) key^=RandomCastle[2];
 354         if(boards[moveNr][CASTLING][4] != NoRights) key^=RandomCastle[3];
 355     }
 356
 357     f = boards[moveNr][EP_STATUS];
 358     if(f >= 0 && f < 8){
 359         if(!WhiteOnMove(moveNr)){
 360             // the test for neighboring Pawns might not be needed,
 361             // as epStatus already kept track of it, but better safe than sorry.
 362             if((f>0 && boards[moveNr][3][f-1]==BlackPawn)||
 363                (f<7 && boards[moveNr][3][f+1]==BlackPawn)){
 364                 key^=RandomEnPassant[f];
 365             }
 366         }else{
 367             if((f>0 && boards[moveNr][4][f-1]==WhitePawn)||
 368                (f<7 && boards[moveNr][4][f+1]==WhitePawn)){
 369                 key^=RandomEnPassant[f];
 370             }
 371         }
 372     }
 373
 374     if(WhiteOnMove(moveNr)){
 375         key^=RandomTurn[0];
 376     }
 377     return key + holdingsKey;
 378 }
 379
 380 #define MOVE_BUF 100
 381
 382 int
 383 int_from_file (FILE *f, int l, uint64 *r)
 384 {
 385     int i,c;
 386     for(i=0;i<l;i++){
 387         c=fgetc(f);
 388         if(c==EOF){
 389             return 1;
 390         }
 391         (*r)=((*r)<<8)+c;
 392     }
 393     return 0;
 394 }
 395
 396 int
 397 entry_from_file (FILE *f, entry_t *entry)
 398 {
 399     int ret;
 400     uint64 r;
 401     ret=int_from_file(f,8,&r);
 402     if(ret) return 1;
 403     entry->key=r;
 404     ret=int_from_file(f,2,&r);
 405     if(ret) return 1;
 406     entry->move=r;
 407     ret=int_from_file(f,2,&r);
 408     if(ret) return 1;
 409     entry->weight=r;
 410     ret=int_from_file(f,2,&r);
 411     if(ret) return 1;
 412     entry->learnCount=r;
 413     ret=int_from_file(f,2,&r);
 414     if(ret) return 1;
 415     entry->learnPoints=r;
 416     return 0;
 417 }
 418
 419 int
 420 find_key (FILE *f, uint64 key, entry_t *entry)
 421 {
 422     int first, last, middle;
 423     entry_t last_entry,middle_entry;
 424     first=-1;
 425     if(fseek(f,-16,SEEK_END)){
 426         *entry=entry_none;
 427         entry->key=key+1; //hack
 428         return -1;
 429     }
 430     last=ftell(f)/16;
 431     entry_from_file(f,&last_entry);
 432     while(1){
 433         if(last-first==1){
 434             *entry=last_entry;
 435             return last;
 436         }
 437         middle=(first+last)/2;
 438         fseek(f,16*middle,SEEK_SET);
 439         entry_from_file(f,&middle_entry);
 440         if(key<=middle_entry.key){
 441             last=middle;
 442             last_entry=middle_entry;
 443         }else{
 444             first=middle;
 445         }
 446     }
 447 }
 448
 449 void
 450 move_to_string (char move_s[6], uint16 move)
 451 {
 452     int f,fr,ff,t,tr,tf,p;
 453     int width = BOARD_RGHT - BOARD_LEFT, size; // allow for alternative board formats
 454
 455     size = width * BOARD_HEIGHT;
 456     f  = move / size;
 457     fr = f / width;
 458     ff = f % width;
 459     t  = move % size;
 460     tr = t / width;
 461     tf = t % width;
 462     p = move / (size*size);
 463     move_s[0] = ff + 'a';
 464     move_s[1] = fr + '1' - (BOARD_HEIGHT > 9);
 465     move_s[2] = tf + 'a';
 466     move_s[3] = tr + '1' - (BOARD_HEIGHT > 9);
 467
 468     // kludge: encode drops as special promotion code
 469     if(gameInfo.holdingsSize && p == 8) {
 470         move_s[0] = f + '@'; // from square encodes piece type
 471         move_s[1] = '@';     // drop symbol
 472         p = 0;
 473     }
 474
 475     // add promotion piece, if any
 476     if(p){
 477         move_s[4] = promote_pieces[p];
 478         move_s[5] = '\0';
 479     }else{
 480         move_s[4] = '\0';
 481     }
 482
 483     if(gameInfo.variant != VariantNormal) return;
 484
 485     // correct FRC-style castlings in variant normal.
 486     // [HGM] This is buggy code! e1h1 could very well be a normal R or Q move.
 487     if(!strcmp(move_s,"e1h1")){
 488       safeStrCpy(move_s,"e1g1", 6);
 489     }else  if(!strcmp(move_s,"e1a1")){
 490       safeStrCpy(move_s,"e1c1", 6);
 491     }else  if(!strcmp(move_s,"e8h8")){
 492       safeStrCpy(move_s,"e8g8", 6);
 493     }else  if(!strcmp(move_s,"e8a8")){
 494       safeStrCpy(move_s,"e8c8", 6);
 495     }
 496 }
 497
 498 int
 499 GetBookMoves (int moveNr, char *book, entry_t entries[])
 500 {   // retrieve all entries for given position from book in 'entries', return number.
 501     static FILE *f = NULL;
 502     static char curBook[MSG_SIZ];
 503     entry_t entry;
 504     int offset;
 505     uint64 key;
 506     int count;
 507     int ret;
 508
 509     if(book == NULL || moveNr >= 2*appData.bookDepth) return -1;
 510 //    if(gameInfo.variant != VariantNormal) return -1; // Zobrist scheme only works for normal Chess, so far
 511     if(!f || strcmp(book, curBook)){ // keep book file open until book changed
 512         strncpy(curBook, book, MSG_SIZ);
 513         if(f) fclose(f);
 514         f = fopen(book,"rb");
 515     }
 516     if(!f){
 517         DisplayError(_("Polyglot book not valid"), 0);
 518         appData.usePolyglotBook = FALSE;
 519         return -1;
 520     }
 521
 522     key = hash(moveNr);
 523     if(appData.debugMode) fprintf(debugFP, "book key = %08x%08x\n", (unsigned int)(key>>32), (unsigned int)key);
 524
 525     offset=find_key(f, key, &entry);
 526     if(entry.key != key) {
 527           return FALSE;
 528     }
 529     entries[0] = entry;
 530     count=1;
 531     fseek(f, 16*(offset+1), SEEK_SET);
 532     while(1){
 533         ret=entry_from_file(f, &entry);
 534         if(ret){
 535             break;
 536         }
 537         if(entry.key != key){
 538             break;
 539         }
 540         if(count == MOVE_BUF) break;
 541         entries[count++] = entry;
 542     }
 543     return count;
 544 }
 545
 546 char *
 547 ProbeBook (int moveNr, char *book)
 548 {
 549     entry_t entries[MOVE_BUF];
 550     int count;
 551     int i, j;
 552     static char move_s[6];
 553     int total_weight;
 554
 555     if((count = GetBookMoves(moveNr, book, entries)) <= 0) return NULL; // no book, or no hit
 556
 557     if(appData.bookStrength != 50) { // transform weights
 558         double power = 0, maxWeight = 0.0;
 559         if(appData.bookStrength) power = (100.-appData.bookStrength)/appData.bookStrength;
 560         for(i=0; i<count; i++) if(entries[i].weight > maxWeight) maxWeight = entries[i].weight;
 561         for(i=0; i<count; i++){
 562             double weight = entries[i].weight / maxWeight;
 563               if(weight > 0)
 564                 entries[i].weight = appData.bookStrength || weight == 1.0 ? 1e4*exp(power * log(weight)) + 0.5 : 0.0;
 565         }
 566     }
 567     total_weight = 0;
 568     for(i=0; i<count; i++){
 569         total_weight += entries[i].weight;
 570     }
 571     if(total_weight == 0) return NULL; // force book miss rather than playing moves with weight 0.
 572     j = (random() & 0xFFF) * total_weight >> 12; // create random < total_weight
 573     total_weight = 0;
 574     for(i=0; i<count; i++){
 575         total_weight += entries[i].weight;
 576         if(total_weight > j) break;
 577     }
 578     if(i >= count) DisplayFatalError(_("Book Fault"), 0, 1); // safety catch, cannot happen
 579     move_to_string(move_s, entries[i].move);
 580     if(appData.debugMode) fprintf(debugFP, "book move field = %d\n", entries[i].move);
 581
 582     return move_s;
 583 }
 584
 585 extern char yy_textstr[];
 586 entry_t lastEntries[MOVE_BUF];
 587
 588 char *
 589 MovesToText (int count, entry_t *entries)
 590 {
 591         int i, totalWeight = 0;
 592         char algMove[6];
 593         char *p = (char*) malloc(30*count+1);
 594         for(i=0; i<count; i++) totalWeight += entries[i].weight;
 595         *p = 0;
 596         for(i=0; i<count; i++) {
 597             char buf[MSG_SIZ];
 598             move_to_string(algMove, entries[i].move);
 599             buf[0] = NULLCHAR;
 600             if(entries[i].learnCount || entries[i].learnPoints)
 601                 snprintf(buf, MSG_SIZ, " {%d/%d}", entries[i].learnPoints, entries[i].learnCount);
 602             snprintf(p+strlen(p), 30, "%5.1f%% %5d %s%s\n", 100*entries[i].weight/(totalWeight+0.001),
 603                                         entries[i].weight, algMove, buf);
 604 //lastEntries[i] = entries[i];
 605         }
 606         return p;
 607 }
 608
 609 int
 610 TextToMoves (char *text, int moveNum, entry_t *entries)
 611 {
 612         int i, w, count=0;
 613       uint64 hashKey = hash(moveNum);
 614         int  fromX, fromY, toX, toY, to, from;
 615         ChessMove  moveType;
 616         char promoChar, valid;
 617         float dummy;
 618         int width = BOARD_RGHT - BOARD_LEFT;
 619
 620         entries[0].key = hashKey; // make sure key is returned even if no moves
 621         while((i=sscanf(text, "%f%%%d", &dummy, &w))==2 || (i=sscanf(text, "%d", &w))==1) {
 622             if(i == 2) text = strchr(text, '%') + 1;  // skip percentage
 623             if(w == 1) text = strstr(text, "1 ") + 2; // skip weight that could be recognized as move number one
 624             valid = ParseOneMove(text, moveNum, &moveType, &fromX, &fromY, &toX, &toY, &promoChar);
 625             text = strstr(text, yy_textstr) + strlen(yy_textstr); // skip what we parsed
 626             if(!valid || moveType != NormalMove) continue;
 627             if(*text == ' ' && sscanf(text+1, "{%hd/%hd}", &entries[count].learnPoints, &entries[count].learnCount) == 2) {
 628                 text = strchr(text+1, '}') + 1;
 629             } else {
 630                 entries[count].learnPoints = 0;
 631                 entries[count].learnCount  = 0;
 632             }
 633             to = toX + toY * width;
 634             from = fromX + fromY * width;
 635             for(i=0; promote_pieces[i]; i++) if(promote_pieces[i] == promoChar) break;
 636             if(!promote_pieces[i]) i = 0;
 637             if(fromY == DROP_RANK) i = 8, from = ToUpper(PieceToChar(fromX)) - '@';
 638             entries[count].move = to + (i * width * BOARD_HEIGHT + from) * width * BOARD_HEIGHT;
 639             entries[count].key  = hashKey;
 640             entries[count].weight = w;
 641             count++;
 642         }
 643         return count;
 644 }
 645
 646 Boolean bookUp;
 647 int currentCount;
 648
 649 Boolean
 650 DisplayBook (int moveNr)
 651 {
 652     entry_t entries[MOVE_BUF];
 653     int count;
 654     char *p;
 655     if(!bookUp) return FALSE;
 656     count = currentCount = GetBookMoves(moveNr, appData.polyglotBook, entries);
 657     if(count < 0) return FALSE;
 658     p = MovesToText(count, entries);
 659     EditTagsPopUp(p, NULL);
 660     free(p);
 661     return TRUE;
 662 }
 663
 664 void
 665 EditBookEvent ()
 666 {
 667       bookUp = TRUE;
 668         bookUp = DisplayBook(currentMove);
 669 }
 670
 671 void
 672 int_to_file (FILE *f, int l, uint64 r)
 673 {
 674     int i;
 675     for(i=l-1;i>=0;i--) fputc(r>>8*i & 255, f);
 676 }
 677
 678 void
 679 entry_to_file (FILE *f, entry_t *entry)
 680 {
 681     int_to_file(f,8,entry->key);
 682     int_to_file(f,2,entry->move);
 683     int_to_file(f,2,entry->weight);
 684     int_to_file(f,2,entry->learnCount);
 685     int_to_file(f,2,entry->learnPoints);
 686 }
 687
 688 char buf1[4096], buf2[4096];
 689
 690 void
 691 SaveToBook (char *text)
 692 {
 693     entry_t entries[MOVE_BUF], entry;
 694     int count = TextToMoves(text, currentMove, entries);
 695     int offset, i, len1=0, len2, readpos=0, writepos=0;
 696     FILE *f;
 697     if(!count && !currentCount) return;
 698     f=fopen(appData.polyglotBook, "rb+");
 699     if(!f){     DisplayError(_("Polyglot book not valid"), 0); return; }
 700     offset=find_key(f, entries[0].key, &entry);
 701     if(entries[0].key != entry.key && currentCount) {
 702           DisplayError(_("Hash keys are different"), 0);
 703           fclose(f);
 704           return;
 705     }
 706     if(count != currentCount) {
 707         readpos = 16*(offset + currentCount);
 708         writepos = 16*(offset + count);
 709         fseek(f, readpos, SEEK_SET);
 710         readpos += len1 = fread(buf1, 1, 4096 - 16*currentCount, f); // salvage some entries immediately behind change
 711     }
 712     fseek(f, 16*(offset), SEEK_SET);
 713     for(i=0; i<count; i++) entry_to_file(f, entries + i); // save the change
 714     if(count != currentCount) {
 715         do {
 716             for(i=0; i<len1; i++) buf2[i] = buf1[i]; len2 = len1;
 717             if(readpos > writepos) {
 718                 fseek(f, readpos, SEEK_SET);
 719                 readpos += len1 = fread(buf1, 1, 4096, f);
 720             } else len1 = 0; // wrote already past old EOF
 721             fseek(f, writepos, SEEK_SET);
 722             fwrite(buf2, 1, len2, f);
 723             writepos += len2;
 724         } while(len1);
 725     }
 726     fclose(f);
 727 }
 728