Akbar2thegreat #3Simply because you blundered a piece (bishop) on move 18.And it's very hard for Queen to win against 3 standard weaker pieces.
Akbar2thegreat #5@bayonetCHARGE 1 Queen is roughly (because position factor is also crucial) equal to 2 Bishops and 1 Knight.
Nerwal #6Queen doesn't do well against rook and two minors unless the board is very open and the king is weak.