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/**
Copyright (c) Scott Gasch
Module Name:
ics.c
Abstract:
Routines to convert internal move structs into ICS (d2d4 style)
move strings and vice versa.
See also san.c.
Author:
Scott Gasch ([email protected]) 16 May 2004
Revision History:
$Id: ics.c 345 2007-12-02 22:56:42Z scott $
**/
#include "chess.h"
CHAR *
MoveToIcs(MOVE mv)
/**
Routine description:
Convert a MOVE into an ICS ("d2d4" style) string. Note: not
thread safe.
Parameters:
MOVE mv : the move to convert
Return value:
CHAR *
**/
{
static char szTextMove[10];
char *p = szTextMove;
if (0 == mv.uMove)
{
return(NULL);
}
memset(szTextMove, 0, sizeof(szTextMove));
ASSERT(IS_ON_BOARD(mv.cFrom));
ASSERT(IS_ON_BOARD(mv.cTo));
*p++ = FILE(mv.cFrom) + 'a';
*p++ = RANK(mv.cFrom) + '0';
*p++ = FILE(mv.cTo) + 'a';
*p++ = RANK(mv.cTo) + '0';
if (mv.pPromoted)
{
if (IS_QUEEN(mv.pPromoted))
{
*p++ = 'Q';
}
else if (IS_ROOK(mv.pPromoted))
{
*p++ = 'R';
}
else if (IS_BISHOP(mv.pPromoted))
{
*p++ = 'B';
}
else if (IS_KNIGHT(mv.pPromoted))
{
*p++ = 'N';
}
else
{
ASSERT(FALSE);
return(NULL);
}
}
*p = 0;
return(szTextMove);
}
MOVE
ParseMoveIcs(CHAR *szInput, POSITION *pos)
/**
Routine description:
Parse a move in ICS format (i.e. "d2d4") and create a MOVE struct.
Parameters:
CHAR *szInput,
POSITION *pos
Return value:
MOVE
**/
{
MOVE mv;
COOR cFrom, cTo;
PIECE pMoved, pCaptured, pProm;
CHAR *szMoveText = StripMove(szInput);
static CHAR *szPieces = "nbrq";
CHAR *p;
mv.uMove = 0;
if (InCheck(pos, pos->uToMove))
{
mv.bvFlags |= MOVE_FLAG_ESCAPING_CHECK;
}
cFrom = FILE_RANK_TO_COOR((tolower(szMoveText[0]) - 'a'),
(tolower(szMoveText[1]) - '0'));
cTo = FILE_RANK_TO_COOR((tolower(szMoveText[2]) - 'a'),
(tolower(szMoveText[3]) - '0'));
//
// check for castling moves in o-o style notation.
//
if ((!STRCMPI(szMoveText, "OO")) ||
(!STRCMPI(szMoveText, "00")) ||
(((E1 == cFrom) && (G1 == cTo)) &&
(pos->rgSquare[E1].pPiece == WHITE_KING)) ||
(((E8 == cFrom) && (G8 == cTo)) &&
(pos->rgSquare[E8].pPiece == BLACK_KING)))
{
if (pos->uToMove == WHITE)
{
if (pos->bvCastleInfo & CASTLE_WHITE_SHORT)
{
ASSERT(pos->rgSquare[E1].pPiece == WHITE_KING);
mv.uMove =
MAKE_MOVE(E1, G1, WHITE_KING, 0, 0, MOVE_FLAG_SPECIAL);
}
}
else // black to move
{
if (pos->bvCastleInfo & CASTLE_BLACK_SHORT)
{
ASSERT(pos->rgSquare[E8].pPiece == BLACK_KING);
mv.uMove =
MAKE_MOVE(E8, G8, BLACK_KING, 0, 0, MOVE_FLAG_SPECIAL);
}
}
goto done;
}
else if ((!STRCMPI(szMoveText, "OOO")) ||
(!STRCMPI(szMoveText, "000")) ||
(((E1 == cFrom) && (C1 == cTo)) &&
(pos->rgSquare[E1].pPiece == WHITE_KING)) ||
(((E8 == cFrom) && (C8 == cTo)) &&
(pos->rgSquare[E8].pPiece == BLACK_KING)))
{
if (pos->uToMove == WHITE)
{
if (pos->bvCastleInfo & CASTLE_WHITE_LONG)
{
ASSERT(pos->rgSquare[E1].pPiece == WHITE_KING);
mv.uMove =
MAKE_MOVE(E1, C1, WHITE_KING, 0, 0, MOVE_FLAG_SPECIAL);
}
}
else // black to move
{
if (pos->bvCastleInfo & CASTLE_BLACK_LONG)
{
ASSERT(pos->rgSquare[E8].pPiece == BLACK_KING);
mv.uMove =
MAKE_MOVE(E8, C8, BLACK_KING, 0, 0, MOVE_FLAG_SPECIAL);
}
}
goto done;
}
if ((!IS_ON_BOARD(cFrom)) ||
(!IS_ON_BOARD(cTo)))
{
goto illegal;
}
pMoved = pos->rgSquare[cFrom].pPiece;
if ((IS_EMPTY(pMoved)) || (GET_COLOR(pMoved) != pos->uToMove))
{
goto illegal;
}
pCaptured = pos->rgSquare[cTo].pPiece;
if ((pCaptured != 0) && (GET_COLOR(pCaptured) == pos->uToMove))
{
goto illegal;
}
mv.cFrom = cFrom;
mv.cTo = cTo;
mv.pMoved = pMoved;
mv.pCaptured = pCaptured;
if (IS_PAWN(pMoved))
{
//
// Promotion
//
if ((szMoveText[4] != 0) && (szMoveText[4] != '\n'))
{
if (IS_PAWN(mv.pMoved))
{
if (((BLACK == GET_COLOR(mv.pMoved)) && (RANK(cTo) != 1)) ||
((WHITE == GET_COLOR(mv.pMoved)) && (RANK(cTo) != 8)))
{
goto illegal;
}
}
p = strchr(szPieces, tolower(szMoveText[4]));
if (NULL == p)
{
goto illegal;
}
pProm = (PIECE)((BYTE *)p - (BYTE *)szPieces);
pProm += 2;
pProm <<= 1;
pProm |= pos->uToMove;
mv.pPromoted = pProm;
mv.bvFlags = MOVE_FLAG_SPECIAL;
}
//
// Handle en passant captures.
//
if (cTo == pos->cEpSquare)
{
mv.bvFlags = MOVE_FLAG_SPECIAL;
if (WHITE == pos->uToMove)
{
mv.pCaptured = pos->rgSquare[cTo + 0x10].pPiece;
ASSERT(mv.pCaptured == BLACK_PAWN);
}
else
{
mv.pCaptured = pos->rgSquare[cTo - 0x10].pPiece;
ASSERT(mv.pCaptured == WHITE_PAWN);
}
}
//
// Handle double jumps.
//
if (RANK(cTo) - RANK(cFrom) > 1)
{
mv.bvFlags = MOVE_FLAG_SPECIAL;
}
}
done:
return(mv);
illegal:
mv.uMove = 0;
return(mv);
}
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