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 til2idx($til, &$idx)
{
if (2 != strlen($til)) {
die('til not two characters long: ' . $til);
}
til2colrow($til, $col, $row);
colrow2sqr($col, $row, $sqr);
sqr2idx($sqr, $idx);
return $idx;
}