function savePromotion()
{
global $mysql;
global $movesArray, $FENarray, $curTurn;
$num_moves = count($FENarray) - 1;
// subtract one for initpos
// when we run the promotion script, the color to be promoted
// is the oppposite of the color who's turn it is
$piece = $_POST['promotion'];
if ('white' == $curTurn) {
$piece = strtolower($piece);
}
// save the promoted piece in the movesArray
$movesArray[$num_moves]['promo'] = $piece;
// seperate the FEN board from the rest of the FEN
$FEN = $FENarray[$num_moves];
$FENbits = trim(substr($FEN, strpos($FEN, ' ')));
$xFEN = expandFEN(substr($FEN, 0, strpos($FEN, ' ')));
// insert the promoted piece
sqr2idx($movesArray[$num_moves]['toSq'], $idx);
FENplace($xFEN, $idx, $movesArray[$num_moves]['promo']);
// and repack the FEN
$FENhead = packFEN($xFEN);
$FEN = $FENhead . ' ' . $FENbits;
// and save the new and improved FEN to the history
$query = "\n\t\tSELECT MAX(h_time)\n\t\tFROM " . T_HISTORY . "\n\t\tWHERE h_game_id = '{$_SESSION['game_id']}'\n\t";
$result = $mysql->fetch_value($query, __LINE__, __FILE__);
$query = "\n\t\tUPDATE " . T_HISTORY . "\n\t\tSET h_fen = '{$FEN}'\n\t\tWHERE h_game_id = '{$_SESSION['game_id']}'\n\t\t\tAND h_time = '{$result}'\n\t";
$mysql->query($query, __LINE__, __FILE__);
updateTimestamp();
}
function movetoFEN()
{
global $FENarray, $movesArray, $board, $COLS, $initpos, $pieceColor;
$num_moves = count($FENarray) - 1;
// get the post info out
foreach ($_POST as $key => $var) {
${$key} = $var;
}
// reverse row and col so i don't confuse myself
$colFrom = $fromCol;
$colTo = $toCol;
$rowFrom = $fromRow;
$rowTo = $toRow;
// and convert it to something we can use
colrow2idx($colFrom, $rowFrom, $idxFrom);
colrow2idx($colTo, $rowTo, $idxTo);
// get the current FEN data
$FENitems = explode(' ', $FENarray[$num_moves]);
$thatFEN = expandFEN($FENitems[0]);
$CM = $FENitems[1];
$CI = $FENitems[2];
$EP = $FENitems[3];
$PN = $FENitems[4];
$MN = $FENitems[5];
$newEP = '-';
// get original placement of rooks
$origARookPos = strpos($initpos, 'R');
$origHRookPos = strrpos($initpos, 'R');
$origKingPos = strpos($initpos, 'K');
// separate the castle indicator
$WK = false !== strpos($CI, 'K') ? 'K' : '';
$WQ = false !== strpos($CI, 'Q') ? 'Q' : '';
$BK = false !== strpos($CI, 'k') ? 'k' : '';
$BQ = false !== strpos($CI, 'q') ? 'q' : '';
// put board into expanded FEN string
$xFEN = "";
for ($i = 7; $i >= 0; $i--) {
for ($j = 0; $j < 8; $j++) {
$xFEN .= $board[$i][$j];
}
}
// get the piece that is moving
$piece = FENplace($xFEN, $idxFrom);
// check for castling move
if ('false' != $_POST['castleMove']) {
if ('white' == $pieceColor[$piece]) {
// clear the castle indicators
$WK = '';
$WQ = '';
// make the move
if ('a' == $_POST['castleMove']) {
FENplace($xFEN, $origKingPos + 56, '0');
// delete the king
FENplace($xFEN, $origARookPos + 56, '0');
// delete the rook
FENplace($xFEN, 2 + 56, 'K');
// place the king
FENplace($xFEN, 3 + 56, 'R');
// place the rook
} elseif ('h' == $_POST['castleMove']) {
FENplace($xFEN, $origKingPos + 56, '0');
// delete the king
FENplace($xFEN, $origHRookPos + 56, '0');
// delete the rook
FENplace($xFEN, 6 + 56, 'K');
// place the king
FENplace($xFEN, 5 + 56, 'R');
// place the rook
} else {
die("castleMove is incorrect");
}
} elseif ('black' == $pieceColor[$piece]) {
// clear the castle indicators
$BK = '';
$BQ = '';
// make the move
if ('a' == $_POST['castleMove']) {
FENplace($xFEN, $origKingPos, '0');
// delete the king
FENplace($xFEN, $origARookPos, '0');
// delete the rook
FENplace($xFEN, 2, 'k');
// place the king
FENplace($xFEN, 3, 'r');
// place the rook
} elseif ('h' == $_POST['castleMove']) {
FENplace($xFEN, $origKingPos, '0');
// delete the king
FENplace($xFEN, $origHRookPos, '0');
// delete the rook
FENplace($xFEN, 6, 'k');
// place the king
FENplace($xFEN, 5, 'r');
// place the rook
} else {
die("castleMove is incorrect");
}
} else {
echo "<pre>";
for ($i = 0; $i < $idxFrom; $i++) {
echo " ";
}
echo "|\n";
echo $xFEN . "</pre>";
}
} else {
// make the move
$piece = FENplace($xFEN, $idxFrom, '0');
$capt = FENplace($xFEN, $idxTo, $piece);
$PN++;
// if we have a pawn advance, or a capture
if ('P' == strtoupper($piece) || '0' != $capt) {
$PN = 0;
}
// reset the ply count
// if we have a pawn double advance
if ('P' == strtoupper($piece) && 2 == abs($rowFrom - $rowTo)) {
colrow2til($colTo, ($rowFrom + $rowTo) * 0.5, $newEP);
}
// set the en passant indicator
// if we moved a castling piece
if ('K' == $piece) {
$WK = '';
$WQ = '';
} elseif ('k' == $piece) {
$BK = '';
$BQ = '';
} elseif ('R' == $piece) {
if ($colFrom == $origARookPos) {
// a-side moved
$WQ = '';
} elseif ($colFrom == $origHRookPos) {
// h-side moved
$WK = '';
}
} elseif ('r' == $piece) {
if ($colFrom == $origARookPos) {
// a-side moved
$BQ = '';
} elseif ($colFrom == $origHRookPos) {
// h-side moved
$BK = '';
}
}
}
// check for en passant capture
colrow2til($colTo, $rowTo, $tilTo);
if ($tilTo == $EP && 'P' == strtoupper($piece)) {
// get the idx of the captured pawn
colrow2idx($colTo, $rowFrom, $idxCapt);
// and remove the captured pawn
FENplace($xFEN, $idxCapt, '0');
}
$FENbit = packFEN($xFEN);
// search for ambiguous castle notation
//--------------------------------------------
// remove any extra information from the current castle notations
if ('' != $WK) {
$WK = 'K';
}
if ('' != $WQ) {
$WQ = 'Q';
}
if ('' != $BK) {
$BK = 'k';
}
if ('' != $BQ) {
$BQ = 'q';
}
// get current position of main pieces
$whiteBackRank = substr($xFEN, -8);
$blackBackRank = substr($xFEN, 0, 8);
// search the ends of the back ranks for rooks
// and add unambiguous notation if needed
if (strrpos($whiteBackRank, 'R') > $origHRookPos && '' != $WK) {
$WK = $WK . substr($COLS, $origHRookPos, 1);
}
if (strpos($whiteBackRank, 'R') < $origARookPos && '' != $WQ) {
$WQ = $WQ . substr($COLS, $origARookPos, 1);
}
if (strrpos($blackBackRank, 'r') > $origHRookPos && '' != $BK) {
$BK = $BK . substr($COLS, $origHRookPos, 1);
}
if (strpos($blackBackRank, 'r') < $origARookPos && '' != $BQ) {
$BQ = $BQ . substr($COLS, $origARookPos, 1);
}
$castlingAvail = $WK . $WQ . $BK . $BQ;
if ('' == $castlingAvail) {
$castlingAvail = '-';
}
// increase the move number (if needed)
$MN = "w" == $CM ? $MN : ++$MN;
// make sure to use the pre-increment (++var) here
// toggle the current move
$CM = "w" == $CM ? "b" : "w";
// put the whole thing together and return
return "{$FENbit} {$CM} {$castlingAvail} {$newEP} {$PN} {$MN}";
}