Take care before capturing the opponent pieces. This may be a chess trap which causes to your defeat.
Trap 1 :
Queen captured the Rook but this is a trap: no way out for Black Queen.
Opponent White pieces are removed by the sacrifice of the Black Bishop.d3 square become available for black Queen. Final with a smothered mate.
Trap 3 and 4:
Select a trap from the drop down menu: