Subversion Repositories Games.Chess Giants

/*

 *******************************************************************************

 *                                                                             *

 *   configuration information:  the following variables need to be set to     *

 *   indicate the machine configuration/capabilities.                          *

 *                                                                             *

 *   UNIX:  define this if the program is being run on a unix-based system,    *

 *   which causes the executable to use unix-specific runtime utilities.       *

 *                                                                             *

 *   CPUS=N:  this sets up data structures to the appropriate size to support  *

 *   up to N simultaneous search engines.  note that you can set this to a     *

 *   value larger than the max processors you currently have, because the mt=n *

 *   command (added to the command line or your crafty.rc/.craftyrc file) will *

 *   control how many threads are actually spawned.                            *

 *                                                                             *

 *******************************************************************************

 */

/* *INDENT-OFF* */

#if defined(AFFINITY)

#  define _GNU_SOURCE

#  include <sched.h>

#endif

#if defined(UNIX)

#  define _GNU_SOURCE

#  if (CPUS > 1)

#    include <pthread.h>

#  endif

#  include <unistd.h>

#  include <sys/types.h>

#  include <sys/stat.h>

#endif

#include <stdint.h>

#include <inttypes.h>

#include <time.h>

#include <stdio.h>

#include <assert.h>

#include <stdlib.h>

#include <string.h>

#if !defined(TYPES_INCLUDED)

#  define TYPES_INCLUDED

#  if !defined (UNIX)

#    define RESTRICT __restrict

#  else

#    define RESTRICT

#  endif

#  if !defined(CPUS)

#    define CPUS 1

#  endif

#  if !defined(UNIX)

#    include <windows.h>

#    include <process.h>

#  endif

#  define CDECL

#  define STDCALL

/* Provide reasonable defaults for UNIX systems. */

#  if !defined(UNIX)

#    undef  STDCALL

#    define STDCALL __stdcall

#    ifdef  VC_INLINE32

#      undef  CDECL

#      define CDECL __cdecl

#    endif

#  endif

#  if !defined(BOOKDIR)

#    define   BOOKDIR      "."

#  endif

#  if !defined(LOGDIR)

#    define   LOGDIR       "."

#  endif

#  if !defined(TBDIR)

#    define   TBDIR        "./TB"

#  endif

#  if !defined(RCDIR)

#    define   RCDIR        "."

#  endif

#  include "lock.h"

#  define MAXPLY                                 129

#  define MAX_TC_NODES                       3000000

#  define MAX_BLOCKS                       64 * CPUS

#  define BOOK_CLUSTER_SIZE                     8000

#  define MERGE_BLOCK                           1000

#  define SORT_BLOCK                         4000000

#  define LEARN_INTERVAL                          10

#  define LEARN_COUNTER_BAD                      -80

#  define LEARN_COUNTER_GOOD                    +100

#  define MATE                                 32768

#  define PAWN_VALUE                             100

#  define KNIGHT_VALUE                           305

#  define BISHOP_VALUE                           305

#  define ROOK_VALUE                             490

#  define QUEEN_VALUE                           1000

#  define KING_VALUE                           40000

#  if !defined(CLOCKS_PER_SEC)

#    define CLOCKS_PER_SEC 1000000

#  endif

typedef enum {

  A1, B1, C1, D1, E1, F1, G1, H1,

  A2, B2, C2, D2, E2, F2, G2, H2,

  A3, B3, C3, D3, E3, F3, G3, H3,

  A4, B4, C4, D4, E4, F4, G4, H4,

  A5, B5, C5, D5, E5, F5, G5, H5,

  A6, B6, C6, D6, E6, F6, G6, H6,

  A7, B7, C7, D7, E7, F7, G7, H7,

  A8, B8, C8, D8, E8, F8, G8, H8,

  BAD_SQUARE

} squares;

typedef enum { FILEA, FILEB, FILEC, FILED, FILEE, FILEF, FILEG, FILEH } files;

typedef enum { RANK1, RANK2, RANK3, RANK4, RANK5, RANK6, RANK7, RANK8 } ranks;

typedef enum { empty = 0, occupied = 0, pawn = 1, knight = 2, bishop = 3,

  rook = 4, queen = 5, king = 6

} PIECE;

typedef enum { black = 0, white = 1 } COLOR;

typedef enum { mg = 0, eg = 1 } PHASE;

typedef enum { empty_v = 0, pawn_v = 1, knight_v = 3,

               bishop_v = 3, rook_v = 5, queen_v = 9, king_v = 99

} PIECE_V;

typedef enum { serial = 0, parallel = 1} SEARCH_MODE;

typedef enum { think = 1, puzzle = 2, book = 3, annotate = 4 } SEARCH_TYPE;

typedef enum { normal_mode, tournament_mode } PLAYING_MODE;

typedef struct {

  int8_t castle[2];

  uint8_t enpassant_target;

  uint8_t reversible;

} SEARCH_POSITION;

typedef struct {

  int move1;

  int move2;

} KILLER;

typedef struct {

  uint64_t pieces[7];

} BB_PIECES;

typedef struct {

  BB_PIECES color[2];

  uint64_t hash_key;

  uint64_t pawn_hash_key;

  int material_evaluation;

  int kingsq[2];

  int8_t board[64];

  char pieces[2][7];

  char total_all_pieces;

} POSITION;

typedef struct {

  uint64_t word1;

  uint64_t word2;

} HASH_ENTRY;

typedef struct {

  uint64_t key;

  int32_t score_mg, score_eg;

  unsigned char defects_k[2];

  unsigned char defects_m[2];

  unsigned char defects_q[2];

  unsigned char passed[2];

} PAWN_HASH_ENTRY;

typedef struct {

  uint64_t entry[3];

} PXOR;

typedef struct {

  int path[MAXPLY];

  int pathh;

  int pathl;

  int pathd;

  int pathv;

} PATH;

typedef struct {

  uint64_t path_sig;

  int hash_pathl;

  int hash_path_age;

  int hash_path_moves[MAXPLY];

} HPATH_ENTRY;

typedef struct {

  int phase;

  int order;

  int remaining;

  unsigned *last;

  unsigned done[10];

  unsigned *exclude;

} NEXT_MOVE;

/*

   root_move.status:

   xxx1 = failed low this iteration

   xx1x = failed high this iteration

   x1xx = don't search in parallel or reduce

   1xxx = move has been searched

 */

typedef struct {

  int move;

  unsigned status;

  int bm_age;

  PATH path;

} ROOT_MOVE;

#  if !defined(UNIX)

#    pragma pack(4)

#  endif

typedef struct {

  uint64_t position;

  unsigned status_played;

  float learn;

} BOOK_POSITION;

#  if !defined(UNIX)

#    pragma pack()

#  endif

typedef struct {

  unsigned char position[8];

  unsigned char status;

  unsigned char percent_play;

} BB_POSITION;

struct personality_term {

  char *description;

  int type;

  int size;

  void *value;

};

struct autotune {

  unsigned int min;

  unsigned int max;

  unsigned int increment;

  char description[64];

  char command[16];

  unsigned int *parameter;

};

typedef struct tree {

/* commonly used variables */

  SEARCH_POSITION status[MAXPLY + 3];

  NEXT_MOVE next_status[MAXPLY];

  KILLER killers[MAXPLY];

  POSITION position;

  uint64_t save_hash_key[MAXPLY + 3];

  uint64_t save_pawn_hash_key[MAXPLY + 3];

  uint64_t rep_list[256];

  int curmv[MAXPLY];

  int phase[MAXPLY];

  int hash_move[MAXPLY];

  unsigned *last[MAXPLY];

  unsigned move_list[5120];

  PATH pv[MAXPLY];

/* variables used by Evaluate() */

  PAWN_HASH_ENTRY pawn_score;

  int tropism[2];

  int dangerous[2];

  uint64_t all_pawns;

  int score_mg, score_eg;

/* statistical counters */

  uint64_t nodes_searched;

  uint64_t fail_highs;

  uint64_t fail_high_first_move;

  uint64_t evaluations;

  uint64_t egtb_probes;

  uint64_t egtb_hits;

  uint64_t extensions_done;

  uint64_t qchecks_done;

  uint64_t moves_fpruned;

  uint64_t moves_mpruned;

  uint64_t LMR_done[16];

  uint64_t null_done[16];

/* thread stuff */

  lock_t lock;

  int thread_id;

  volatile int joinable;

  volatile int joined;

  volatile int stop;

  volatile int nprocs;

  int alpha;

  int beta;

  volatile int value;

  int wtm;

  int depth;

  int ply;

  int in_check;

  int *searched;

  int cutmove;

  struct tree *volatile siblings[CPUS], *parent;

/* rarely accessed */

  char root_move_text[16];

  char remaining_moves_text[16];

} TREE;

typedef struct thread {

  TREE *tree;

  uint64_t blocks;

  uint64_t max_blocks;

  unsigned int idle;

  volatile unsigned int terminate;

  char filler[40];

} THREAD;

/*

   DO NOT modify these.  these are constants, used in multiple modules.

   modification may corrupt the search in any number of ways, all bad.

 */

#  define WORTHLESS                    0

#  define UPPER                        1

#  define LOWER                        2

#  define EXACT                        3

#  define HASH_MISS                    0

#  define HASH_HIT                     1

#  define AVOID_NULL_MOVE              2

#  define NO_NULL                      0

#  define DO_NULL                      1

#  define NONE                         0

#  define NULL_MOVE                    1

#  define DO_NOT_REDUCE                1

#  define HASH                         2

#  define GENERATE_CAPTURES            3

#  define CAPTURES                     4

#  define KILLER1                      5

#  define KILLER2                      6

#  define KILLER3                      7

#  define KILLER4                      8

#  define COUNTER_MOVE1                9

#  define COUNTER_MOVE2               10

#  define MOVE_PAIR1                  11

#  define MOVE_PAIR2                  12

#  define GENERATE_QUIET              13

#  define HISTORY                     14

#  define REMAINING                   15

#  define EVALUATION                  16

#  define ILLEGAL                      0

#  define LEGAL                        1

#  define IN_WINDOW                    2

#  define FAIL_HIGH                    3

#if /*defined(UNIX) &&*/ !defined(INLINEASM) // Pierre-Marie Baty -- we also use them on Windows...

int CDECL PopCnt(uint64_t);

int CDECL MSB(uint64_t);

int CDECL LSB(uint64_t);

#endif

void AlignedMalloc(void **, int, size_t);

void AlignedRemalloc(void **, int, size_t);

void Analyze(void);

void Annotate(void);

void AnnotateHeaderHTML(char *, FILE *);

void AnnotateFooterHTML(FILE *);

void AnnotatePositionHTML(TREE *RESTRICT, int, FILE *);

char *AnnotateVtoNAG(int, int, int, int);

void AnnotateHeaderTeX(FILE *);

void AnnotateFooterTeX(FILE *);

void AnnotatePositionTeX(TREE *, int, FILE *);

uint64_t atoiKMB(char *);

int Attacks(TREE *RESTRICT, int, int);

uint64_t Attacked(TREE *RESTRICT, int, uint64_t);

uint64_t AttacksFrom(TREE *RESTRICT, int, int);

uint64_t AttacksTo(TREE *RESTRICT, int);

void AutoTune(int, char **);

int Bench(int, int);

int Bench_PGO(int, int);

int Book(TREE *RESTRICT, int);

void BookClusterIn(FILE *, int, BOOK_POSITION *);

void BookClusterOut(FILE *, int, BOOK_POSITION *);

int BookIn32(unsigned char *);

float BookIn32f(unsigned char *);

uint64_t BookIn64(unsigned char *);

int BookMask(char *);

unsigned char *BookOut32(int);

unsigned char *BookOut32f(float);

unsigned char *BookOut64(uint64_t);

int BookPonderMove(TREE *RESTRICT, int);

void Bookup(TREE *RESTRICT, int, char **);

void BookSort(BB_POSITION *, int, int);

int BookupCompare(const void *, const void *);

BB_POSITION BookupNextPosition(int, int);

int CheckInput(void);

void ClearHashTableScores(void);

int ComputeDifficulty(int, int);

void CopyFromParent(TREE *RESTRICT);

void CopyToParent(TREE *RESTRICT, TREE *RESTRICT, int);

void CraftyExit(int);

void DisplayArray(int *, int);

void DisplayArrayX2(int *, int *, int);

void DisplayBitBoard(uint64_t);

void Display2BitBoards(uint64_t, uint64_t);

void DisplayChessBoard(FILE *, POSITION);

char *DisplayEvaluation(int, int);

char *DisplayEvaluationKibitz(int, int);

void DisplayFT(int, int, int);

char *DisplayHHMM(unsigned);

char *DisplayHHMMSS(unsigned);

char *DisplayKMB(uint64_t, int);

void DisplayFail(TREE *RESTRICT, int, int, int, int, int, int, int);

char *DisplayPath(TREE *RESTRICT, int, PATH *);

void DisplayPV(TREE *RESTRICT, int, int, int, PATH *, int);

char *DisplayTime(unsigned);

char *Display2Times(unsigned);

char *DisplayTimeKibitz(unsigned);

void DisplayChessMove(char *, int);

int Drawn(TREE *RESTRICT, int);

void Edit(void);

#  if !defined(NOEGTB)

int EGTBProbe(TREE *RESTRICT, int, int, int *);

void EGTBPV(TREE *RESTRICT, int);

#  endif

int Evaluate(TREE *RESTRICT, int, int, int, int);

void EvaluateBishops(TREE *RESTRICT, int);

void EvaluateCastling(TREE *RESTRICT, int, int);

int EvaluateDraws(TREE *RESTRICT, int, int, int);

int EvaluateHasOpposition(int, int, int);

void EvaluateKing(TREE *RESTRICT, int, int);

int EvaluateKingsFile(TREE * RESTRICT, int, int, int);

void EvaluateKnights(TREE *RESTRICT, int);

void EvaluateMate(TREE *RESTRICT, int);

void EvaluateMaterial(TREE *RESTRICT, int);

void EvaluatePassedPawns(TREE *RESTRICT, int, int);

void EvaluatePassedPawnRaces(TREE *RESTRICT, int);

void EvaluatePawns(TREE *RESTRICT, int);

void EvaluateQueens(TREE *RESTRICT, int);

void EvaluateRooks(TREE *RESTRICT, int);

int EvaluateWinningChances(TREE *RESTRICT, int, int);

void EVTest(char *);

int Exclude(TREE *RESTRICT, int, int);

int FindBlockID(TREE *RESTRICT);

char *FormatPV(TREE *RESTRICT, int, PATH);

int FTbSetCacheSize(void *, unsigned long);

int GameOver(int);

unsigned *GenerateCaptures(TREE *RESTRICT, int, int, unsigned *);

unsigned *GenerateCheckEvasions(TREE *RESTRICT, int, int, unsigned *);

unsigned *GenerateChecks(TREE *RESTRICT, int, unsigned *);

unsigned *GenerateNoncaptures(TREE *RESTRICT, int, int, unsigned *);

TREE *GetBlock(TREE *, int);

void Initialize(void);

void InitializeAttackBoards(void);

void InitializeChessBoard(TREE *);

int InitializeGetLogID();

void InitializeHashTables(int);

void InitializeKillers(void);

void InitializeKingSafety(void);

void InitializeMagic(void);

uint64_t InitializeMagicBishop(int, uint64_t);

uint64_t InitializeMagicRook(int, uint64_t);

uint64_t InitializeMagicOccupied(int *, int, uint64_t);

void InitializeMasks(void);

void InitializePawnMasks(void);

void InitializeReductions(void);

void InitializeSMP(void);

int IInitializeTb(char *);

int InputMove(TREE *RESTRICT, int, int, int, int, char *);

int InputMoveICS(TREE *RESTRICT, int, int, int, int, char *);

uint64_t InterposeSquares(int, int, int);

void Interrupt(int);

int InvalidPosition(TREE *RESTRICT);

int Iterate(int, int, int);

int Join(int64_t);

void Kibitz(int, int, int, int, int, uint64_t, int, int, char *);

void History(TREE *RESTRICT, int, int, int, int, int*);

int KingPawnSquare(int, int, int, int);

int LearnAdjust(int);

void LearnBook(void);

int LearnFunction(int, int, int, int);

void LearnValue(int, int);

void MakeMove(TREE *RESTRICT, int, int, int);

void MakeMoveRoot(TREE *RESTRICT, int, int);

void NewGame(int);

int NextMove(TREE *RESTRICT, int, int, int, int);

int NextRootMove(TREE *RESTRICT, TREE *RESTRICT, int);

int NextRootMoveParallel(void);

void NextSort(TREE *RESTRICT, int);

int Option(TREE *RESTRICT);

int OptionMatch(char *, char *);

void OptionPerft(TREE *RESTRICT, int, int, int);

void Output(TREE *RESTRICT);

char *OutputMove(TREE *RESTRICT, int, int, int);

int ParseTime(char *);

void Pass(void);

int PinnedOnKing(TREE *RESTRICT, int, int);

int Ponder(int);

void Print(int, char *, ...);

int HashProbe(TREE *RESTRICT, int, int, int, int, int, int*);

void HashStore(TREE *RESTRICT, int, int, int, int, int, int);

void HashStorePV(TREE *RESTRICT, int, int);

int Quiesce(TREE *RESTRICT, int, int, int, int, int);

int QuiesceEvasions(TREE *RESTRICT, int, int, int, int);

unsigned Random32(void);

uint64_t Random64(void);

int Read(int, char *);

int ReadChessMove(TREE *RESTRICT, FILE *, int, int);

void ReadClear(void);

unsigned ReadClock(void);

int ReadPGN(FILE *, int);

int ReadNextMove(TREE *RESTRICT, char *, int, int);

int ReadParse(char *, char *args[], char *);

int ReadInput(void);

int Repeat(TREE *RESTRICT, int);

int Repeat3x(TREE *RESTRICT);

void ResignOrDraw(TREE *RESTRICT, int);

void RestoreGame(void);

void RootMoveList(int);

int Search(TREE *RESTRICT, int, int, int, int, int, int, int);

int SearchMove(TREE *RESTRICT, int, int, int, int, int, int, int, int, int);

int SearchMoveList(TREE *RESTRICT, int, int, int, int, int, int *, int, int, int);

int SearchNull(TREE * RESTRICT, int, int, int, int);

void Trace(TREE *RESTRICT, int, int, int, int, int, const char *, int, int, int);

void SetBoard(TREE *, int, char **, int);

void SetChessBitBoards(TREE *);

void SharedFree(void *address);

void SortRootMoves(void);

int Split(TREE *RESTRICT);

int StrCnt(char *, char);

int SEE(TREE *RESTRICT, int, int);

int SEEO(TREE *RESTRICT, int, int);

void Test(char *, FILE *, int, int);

void TestEPD(char *, FILE *, int, int);

void ThreadAffinity(int);

void *STDCALL ThreadInit(void *);

#  if !defined(UNIX)

void ThreadMalloc(int64_t);

#  endif

int ThreadSplit(TREE *RESTRICT, int, int, int, int, int);

void ThreadStop(TREE *RESTRICT);

void ThreadTrace(TREE * RESTRICT, int, int);

int ThreadWait(int, TREE *RESTRICT);

int Threat(TREE *, int, int, int, int);

void TimeAdjust(int, int);

int TimeCheck(TREE *RESTRICT, int);

void TimeSet(int);

void UnmakeMove(TREE *RESTRICT, int, int, int);

int ValidMove(TREE *RESTRICT, int, int, int);

int VerifyMove(TREE *RESTRICT, int, int, int);

void ValidatePosition(TREE *RESTRICT, int, int, char *);

void WaitForAllThreadsInitialized(void);

#  if !defined(UNIX)

extern void *WinMallocInterleaved(size_t, int);

extern void WinFreeInterleaved(void *, size_t);

#    define MallocInterleaved(cBytes, cThreads)     \

       WinMallocInterleaved(cBytes, cThreads)

#    define FreeInterleaved(pMemory, cBytes)        \

       WinFreeInterleaved(pMemory, cBytes)

#  else

#    if defined(NUMA)

#      define MallocInterleaved(cBytes, cThreads) numa_alloc_interleaved(cBytes)

#      define FreeInterleaved(pMemory, cBytes)          numa_free(pMemory, 1)

#    else

#      define MallocInterleaved(cBytes, cThreads) malloc(cBytes)

#      define FreeInterleaved(pMemory, cBytes)          free(pMemory)

#    endif

#  endif

#  define Abs(a)    (((a) > 0) ? (a) : -(a))

#  define Max(a,b)  (((a) > (b)) ? (a) : (b))

#  define Min(a,b)  (((a) < (b)) ? (a) : (b))

#  define Sign(a)   ((a) < 0 ? -1 : +1)

#  define FileDistance(a,b) abs(File(a) - File(b))

#  define RankDistance(a,b) abs(Rank(a) - Rank(b))

#  define Distance(a,b) Max(FileDistance(a,b), RankDistance(a,b))

#  define DrawScore(side)                  (draw_score[side])

#  define PopCnt8Bit(a) (pop_cnt_8bit[a])

#  define MSB8Bit(a) (msb_8bit[a])

#  define LSB8Bit(a) (lsb_8bit[a])

#  define HistoryIndex(side, m) ((side << 9) + (Piece(m) << 6) + To(m))

/*

   side = side to move

   mptr = pointer into move list

   m = bit vector of to squares to unpack

   t = pre-computed from + moving piece

 */

#  define Extract(side, mptr, m, t)                                         \

  for ( ; m ; Clear(to, m)) {                                               \

    to = MostAdvanced(side, m);                                             \

    *mptr++ = t | (to << 6) | (Abs(PcOnSq(to)) << 15);                      \

  }

#  define Check(side) Attacks(tree, Flip(side), KingSQ(side))

#  define Attack(from,to) (!(intervening[from][to] & OccupiedSquares))

#  define BishopAttacks(square, occ) *(magic_bishop_indices[square]+((((occ)&magic_bishop_mask[square])*magic_bishop[square])>>magic_bishop_shift[square]))

#  define BishopMobility(square, occ) *(magic_bishop_mobility_indices[square]+((((occ)&magic_bishop_mask[square])*magic_bishop[square])>>magic_bishop_shift[square]))

#  define KingAttacks(square) king_attacks[square]

#  define KnightAttacks(square) knight_attacks[square]

#  define PawnAttacks(side, square)   pawn_attacks[side][square]

#  define Reversible(p)               (tree->status[p].reversible)

#  define RookAttacks(square, occ) *(magic_rook_indices[square]+((((occ)&magic_rook_mask[square])*magic_rook[square])>>magic_rook_shift[square]))

#  define RookMobility(square, occ) *(magic_rook_mobility_indices[square]+((((occ)&magic_rook_mask[square])*magic_rook[square])>>magic_rook_shift[square]))

#  define QueenAttacks(square, occ)   (BishopAttacks(square, occ)|RookAttacks(square, occ))

#  define Rank(x)        ((x)>>3)

#  define File(x)        ((x)&7)

#  define Flip(x)        ((x)^1)

#  define MostAdvanced(side, squares) ((side) ? MSB(squares) : LSB(squares))

#  define LeastAdvanced(side, squares) ((side) ? LSB(squares) : MSB(squares))

#  define MinMax(side, v1, v2) ((side) ? Min((v1), (v2)) : Max((v1), (v2)))

#  define InFront(side, k, p) ((side) ? k > p : k < p)

#  define Behind(side, k, p) ((side) ? k < p : k > p)

#  define Passed(sq, wtm)        (!(mask_passed[wtm][sq] & Pawns(Flip(wtm))))

#  define RankAttacks(a) (RookAttacks(a, OccupiedSquares) & rank_mask[Rank(a)])

#  define FileAttacks(a) (RookAttacks(a, OccupiedSquares) & file_mask[File(a)])

#  define Diaga1Attacks(a) (BishopAttacks(a, OccupiedSquares) & (plus9dir[a] | minus9dir[a]))

#  define Diagh1Attacks(a) (BishopAttacks(a, OccupiedSquares) & (plus7dir[a] | minus7dir[a]))

#  define InterposeSquares(kingsq, checksq) intervening[kingsq][checksq]

/*

   the following macros are used to extract the pieces of a move that are

   kept compressed into the rightmost 21 bits of a simple integer.

 */

#  define From(a)               ((a) & 63)

#  define To(a)                 (((a)>>6) & 63)

#  define Piece(a)              (((a)>>12) & 7)

#  define Captured(a)           (((a)>>15) & 7)

#  define Promote(a)            (((a)>>18) & 7)

#  define Move(a)               (a & 0x1fffff)

#  define SortV(a)              (a >> 21)

#  define CaptureOrPromote(a)   (((a)>>15) & 63)

#  define PawnPush(c, a)        (Piece(a) == pawn &&                          \

                                     rankflip[c][Rank(To(a))] >= RANK6        \

                                     && !(mask_passed[c][To(a)] &             \

                                          Pawns(Flip(c))))

#  define CastleMove(c, a)       (Piece(a) == king && Abs(File(To(a)) -       \

                                     File(From(a))) > 1)

#  define SetMask(a)             (set_mask[a])

#  define ClearMask(a)           (clear_mask[a])

#  define Pawns(c)               (tree->position.color[c].pieces[pawn])

#  define Knights(c)             (tree->position.color[c].pieces[knight])

#  define Bishops(c)             (tree->position.color[c].pieces[bishop])

#  define Rooks(c)               (tree->position.color[c].pieces[rook])

#  define Queens(c)              (tree->position.color[c].pieces[queen])

#  define Kings(c)               (tree->position.color[c].pieces[king])

#  define KingSQ(c)              (tree->position.kingsq[c])

#  define Occupied(c)            (tree->position.color[c].pieces[occupied])

#  define Pieces(c, p)           (tree->position.color[c].pieces[p])

#  define TotalPieces(c, p)      (tree->position.pieces[c][p])

#  define PieceValues(c, p)      (piece_values[c][p])

#  define TotalAllPieces         (tree->position.total_all_pieces)

#  define Material               (tree->position.material_evaluation)

#  define MaterialSTM(side)      ((side) ? Material : -Material)

#  define MateScore(s)           (Abs(s) > 32000)

#  define Castle(ply, c)         (tree->status[ply].castle[c])

#  define HashKey                (tree->position.hash_key)

#  define PawnHashKey            (tree->position.pawn_hash_key)

#  define EnPassant(ply)         (tree->status[ply].enpassant_target)

#  define EnPassantTarget(ply)   (EnPassant(ply) ? SetMask(EnPassant(ply)) : 0)

#  define PcOnSq(sq)             (tree->position.board[sq])

#  define OccupiedSquares        (Occupied(white) | Occupied(black))

#  define Color(square)       (square_color[square] ? dark_squares : ~dark_squares)

#  define SideToMove(c)          ((c) ? "White" : "Black")

/*

   the following macros are used to Set and Clear a specific bit in the

   second argument.  this is done to make the code more readable, rather

   than to make it faster.

 */

#  define ClearSet(a,b)         b=((a) ^ (b))

#  define Clear(a,b)            b=ClearMask(a) & (b)

#  define Set(a,b)              b=SetMask(a) | (b)

/*

   the following macros are used to update the hash signatures.

 */

#  define Hash(stm,piece,square)     (HashKey^=randoms[stm][piece][square])

#  define HashP(stm,square)          (PawnHashKey^=randoms[stm][pawn][square])

#  define HashCastle(stm,direction)  (HashKey^=castle_random[stm][direction])

#  define HashEP(sq)                 (HashKey^=enpassant_random[sq])

#  define SavePV(tree,ply,ph)        do {                                     \

        tree->pv[ply-1].path[ply-1]=tree->curmv[ply-1];                       \

        tree->pv[ply-1].pathl=ply;                                            \

        tree->pv[ply-1].pathh=ph;                                             \

        tree->pv[ply-1].pathd=iteration;} while(0)

#  if defined(INLINEASM)

#    include "inline.h"

#  endif

#endif

/* *INDENT-ON* */