Trapping the queen

Trapping the queen is a rare tactical motif in chess where a queen, the most powerful piece, is en prise and cannot move to safety or be rescued by another piece. The tactic is similar to a mating net, with the only difference being that the queen is the target, rather than the king.
Trapping a queen almost always occurs when the queen is deep in enemy territory, has limited movement due to being surrounded by many pieces, or both. When a player's queen is successfully trapped, it usually results in their immediate resignation, as losing the queen without significant compensation is almost invariably fatal in high levels of play.

Examples

The diagram on the right shows a position from the game Alekhine-Rubinstein, San Remo 1930. White plays for trapping the queen, as after the moves, Black's queen is lost. In the game, Black did not take the knight and after the sequence, simply lost a pawn without compensation.
A more complex position, shown in the second diagram originates from the game Liberman-Ioffe, URS, 1961. After the move 1.Ne6 Bf8. After the moves 3.Bxd7+Kxd7 4.Qxa5
The position shown in the third diagram on the right originates from the game Nezhmetdinov-Konstantinov, Rostov, 1936, after the moves. When one of the strongest tactical geniuses of all time, Rashid Nezhmetdinov leaves a rook hanging, it may be advisable to proceed with caution. However, in the game Black took the rook and after 2.Bb1 he resigned, since the Black queen is trapped and will be lost after 3.Bb2