function reachable_squares()
{
#Array of square where the piece can move to
$squares = array();
$csq = $this->get_current_square();
$tsq = Board::add_vert_distance($csq, 2);
if ($tsq) {
$sq = Board::square_right_of($tsq);
if ($sq) {
$squares[] = $sq;
}
$sq = Board::square_left_of($tsq);
if ($sq) {
$squares[] = $sq;
}
}
$tsq = Board::add_vert_distance($csq, -2);
if ($tsq) {
$sq = Board::square_right_of($tsq);
if ($sq) {
$squares[] = $sq;
}
$sq = Board::square_left_of($tsq);
if ($sq) {
$squares[] = $sq;
}
}
$tsq = Board::add_horz_distance($csq, 2);
if ($tsq) {
$sq = Board::square_up_from($tsq);
if ($sq) {
$squares[] = $sq;
}
$sq = Board::square_down_from($tsq);
if ($sq) {
$squares[] = $sq;
}
}
$tsq = Board::add_horz_distance($csq, -2);
if ($tsq) {
$sq = Board::square_up_from($tsq);
if ($sq) {
$squares[] = $sq;
}
$sq = Board::square_down_from($tsq);
if ($sq) {
$squares[] = $sq;
}
}
return $squares;
}
function reachable_squares()
{
#Array of square where the piece can move to
$squares = array();
$csq = $this->get_current_square();
$sq1 = Board::square_left_of($csq);
if ($sq1) {
$squares[] = $sq1;
$sq2 = Board::square_up_from($sq1);
if (defined($sq2)) {
$squares[] = $sq2;
}
$sq2 = Board::square_down_from($sq1);
if (defined($sq2)) {
$squares[] = $sq2;
}
}
$sq1 = Board::square_right_of($csq);
if ($sq1) {
$squares[] = $sq1;
$sq2 = Board::square_up_from($sq1);
if ($sq2) {
$squares[] = $sq2;
}
$sq2 = Board::square_down_from($sq1);
if ($sq2) {
$squares[] = $sq2;
}
}
$sq1 = Board::square_up_from($csq);
if ($sq1) {
$squares[] = $sq1;
}
$sq1 = Board::square_down_from($csq);
if ($sq1) {
$squares[] = $sq1;
}
$sq1 = Board::add_horz_distance($csq, 2);
if ($sq1 && !$this->moved()) {
$squares[] = $sq1;
}
$sq1 = Board::add_horz_distance($csq, -2);
if ($sq1 && !$this->moved()) {
$squares[] = $sq1;
}
return $squares;
}
function reachable_squares()
{
#Array of square where the piece can move to
$squares = array();
$color = $this->get_player();
$csq = $this->get_current_square();
if ($color == 'white') {
if ($csq) {
$tsq1 = Board::square_up_from($csq);
}
} else {
if ($csq) {
$tsq1 = Board::square_down_from($csq);
}
}
if (isset($tsq1)) {
$squares[] = $tsq1;
}
if ($color == 'white') {
if ($tsq1) {
$tsq2 = Board::square_up_from($tsq1);
}
} else {
if ($tsq1) {
$tsq2 = Board::square_down_from($tsq1);
}
}
if (!$this->moved() and $tsq2) {
$squares[] = $tsq2;
}
if ($tsq1) {
$tsq2 = Board::square_left_of($tsq1);
}
if ($tsq2) {
$squares[] = $tsq2;
}
if ($tsq1) {
$tsq2 = Board::square_right_of($tsq1);
}
if ($tsq2) {
$squares[] = $tsq2;
}
return $squares;
}
/**
* Returns MoveListEntry representing the
* last move made, and sets the state of the game to what it was prior to the
* returned move being made.
*
* @return MoveListEntry the last MoveListEntry object of the move that has been taken back
*/
public function take_back_move()
{
$movelist = $this->movelist;
$board = $this->board;
$curr_player = $movelist->get_last_moved();
$player1 = $this->players[0];
$move = $movelist->delete_move();
#There is a existing last move
if ($move) {
$movenum = $move->get_move_num();
$piece = $move->get_piece();
$player = $piece->get_player();
$ssq = $move->get_start_square();
$dsq = $move->get_dest_square();
#If last move was a promotion
if ($move->is_promotion()) {
//delete the prometed piece
$hash = $move->get_promoted_hash();
unset($this->pieces[$piece->get_player()][$hash]);
}
#If last move was a capture
if ($move->is_capture()) {
$capture = $this->captures[$player][$movenum];
if ($move->is_en_passant()) {
if ($player == $player1) {
$dsq = Board::square_down_from($dsq);
} else {
$dsq = Board::square_up_from($dsq);
}
}
$board->set_piece_at($dsq, $capture);
$capture->set_current_square($dsq);
$capture->set_captured(0);
$board->set_piece_at($ssq, $piece);
$piece->set_current_square($ssq);
if ($piece->_firstmoved() == $movenum) {
$piece->set_moved(0);
}
} elseif ($move->is_short_castle()) {
$king_sq = $player == $player1 ? "e1" : "e8";
$rook_sq = $player == $player1 ? "h1" : "h8";
$king_curr_sq = $player == $player1 ? "g1" : "g8";
$rook_curr_sq = $player == $player1 ? "f1" : "f8";
$rook = $board->get_piece_at($rook_curr_sq);
$board->set_piece_at($king_curr_sq, NULL);
$board->set_piece_at($rook_curr_sq, NULL);
$board->set_piece_at($king_sq, $piece);
$board->set_piece_at($rook_sq, $rook);
$rook->set_current_square($rook_sq);
$piece->set_current_square($king_sq);
$rook->set_moved(0);
$piece->set_moved(0);
} elseif ($move->is_long_castle()) {
$king_sq = $player == $player1 ? "e1" : "e8";
$rook_sq = $player == $player1 ? "a1" : "a8";
$king_curr_sq = $player == $player1 ? "c1" : "c8";
$rook_curr_sq = $player == $player1 ? "d1" : "d8";
$rook = $board->get_piece_at($rook_curr_sq);
$board->set_piece_at($king_curr_sq, NULL);
$board->set_piece_at($rook_curr_sq, NULL);
$board->set_piece_at($king_sq, $piece);
$board->set_piece_at($rook_sq, $rook);
$rook->set_current_square($rook_sq);
$piece->set_current_square($king_sq);
$rook->set_moved(0);
$piece->set_moved(0);
} else {
$board->set_piece_at($dsq, NULL);
$board->set_piece_at($ssq, $piece);
$piece->set_current_square($ssq);
if ($piece->_firstmoved() == $movenum) {
$piece->set_moved(0);
}
}
#delete last
unset($this->player_has_moves[$player][$movenum]);
}
return $move;
}