private function FindTilesAttackedByRook($nRank, $nFile)
{
// $this->nCalls++;
// $nTile = $nRank * 8 + $nFile; $nBlockingTile = 0;
// // Find tiles to attack in the four horizontal/vertical directions
// $n64Blockers = BitBoard::_AND_($this->n64All, $this->Plus8[$nTile]);
// $nBlockingTile = $n64Blockers->get_pos_of_first_one_bit(); // $this->ChessUtils->FindFirstOneBit($n64Blockers);
// $n64AttackedTiles = BitBoard::_XOR_($this->Plus8[$nTile], $this->Plus8[$nBlockingTile]);
// $n64Blockers = BitBoard::_AND_($this->n64All, $this->Plus1[$nTile]);
// $nBlockingTile = $n64Blockers->get_pos_of_first_one_bit(); // $this->ChessUtils->FindFirstOneBit($n64Blockers);
// $n64AttackedTiles->_OR(BitBoard::_XOR_($this->Plus1[$nTile], $this->Plus1[$nBlockingTile]));
// $n64Blockers = BitBoard::_AND_($this->n64All, $this->Minus8[$nTile]);
// $nBlockingTile = $n64Blockers->get_pos_of_last_one_bit(); // $this->ChessUtils->FindLastOneBit($n64Blockers);
// $n64AttackedTiles->_OR(BitBoard::_XOR_($this->Minus8[$nTile], $this->Minus8[$nBlockingTile]));
// $n64Blockers = BitBoard::_AND_($this->n64All, $this->Minus1[$nTile]);
// $nBlockingTile = $n64Blockers->get_pos_of_last_one_bit(); // $this->ChessUtils->FindLastOneBit($n64Blockers);
// $n64AttackedTiles->_OR(BitBoard::_XOR_($this->Minus1[$nTile], $this->Minus1[$nBlockingTile]));
// return $n64AttackedTiles;
// NOTE: is this way faster? It creates less duplicates.
$this->nCalls++;
$nTile = $nRank * 8 + $nFile;
$nBlockingTile = 0;
$tmp = new BitBoard();
// Find tiles to attack in the four horizontal/vertical directions
$n64Blockers = $tmp->_OR($this->n64All)->_AND($this->Plus8[$nTile]);
$nBlockingTile = $n64Blockers->get_pos_of_first_one_bit();
// $this->ChessUtils->FindFirstOneBit($n64Blockers);
$n64AttackedTiles = BitBoard::_XOR_($this->Plus8[$nTile], $this->Plus8[$nBlockingTile]);
$tmp->set_to_zero();
$n64Blockers = $tmp->_OR($this->n64All)->_AND($this->Plus1[$nTile]);
$nBlockingTile = $n64Blockers->get_pos_of_first_one_bit();
// $this->ChessUtils->FindFirstOneBit($n64Blockers);
$n64AttackedTiles->_OR(BitBoard::_XOR_($this->Plus1[$nTile], $this->Plus1[$nBlockingTile]));
$tmp->set_to_zero();
$n64Blockers = $tmp->_OR($this->n64All)->_AND($this->Minus8[$nTile]);
$nBlockingTile = $n64Blockers->get_pos_of_last_one_bit();
// $this->ChessUtils->FindLastOneBit($n64Blockers);
$n64AttackedTiles->_OR(BitBoard::_XOR_($this->Minus8[$nTile], $this->Minus8[$nBlockingTile]));
$tmp->set_to_zero();
$n64Blockers = $tmp->_OR($this->n64All)->_AND($this->Minus1[$nTile]);
$nBlockingTile = $n64Blockers->get_pos_of_last_one_bit();
// $this->ChessUtils->FindLastOneBit($n64Blockers);
$n64AttackedTiles->_OR(BitBoard::_XOR_($this->Minus1[$nTile], $this->Minus1[$nBlockingTile]));
return $n64AttackedTiles;
}
