Trapping: The "No Exit" Strategy
The Concept: A piece is Trapped when it is safe for the moment, but has absolutely nowhere to go. It hasn't been captured yet, but its doom is inevitable because all escape routes are cut off.
1. The Greedy Queen
De Francisco vs. Morrisson
The Trap: Queen hunting on h7.
1...Rg6 2.Qh5 Bg4!
3.Qh8 Rh6 4.Qg8 Be6
5.Rfe1 f5!
Black methodically removes every escape square. After `5...f5`, the Queen has absolutely nowhere to run.
2. The Middlegame Cage
Therrien vs. Baburin
The Trap: Queen infiltrated to b2.
1.Bxh3 Bxh3
2.Rfb1! Qc2 3.Ra2!
White closes the door with Rooks. `wins material`
3. The Invisible Wall
Ree vs. Hort
The Trap: Queen on h5.
1...Rxh4! 2.Kxh4 Bd4!
A draw was soon agreed. As long as black keeps his B on the a1-h8 diagonal, the white Q can never escape the cage she is in.
4. The Stranded Knight
Onischuk vs. Morozevich
The Trap: Knight on b7.
1...Qb6
2.Qxb6 axb6
3.Nd8 Rd6!
White resigned. The White Knight is trapped on d8.
5. The Trapped Rook
Radjabov vs. Shirov
The Trap: Rook on d5.
1.b4! (threat 2.Bc4) Rc8
2.a4!
White now threatens `Be4` winning the exchange. The Rook has no safe squares.
6. The Dominated Rook
Stahlberg vs. Persitz
The Trap: Rook on a8.
1.Bb8! 1...Raxb8
2.Qxb8
One-move finish! If `Rfxb8` then `2.Qxb8+` mates, and any other move loses the rook on a8.
7. The Bishop Trap
Alekhine vs. Blackburne
The Trap: Bishop on b5.
1...Qa5 2.a4 a6
Even GMs blunder! The pawns force the Bishop into a dead end.
Wait... isn't "Setting a Trap" the same thing?
No! "Trapping a Piece" means restricting its movement so it has zero safe squares (like the examples above).
"Setting a Trap" means laying a hidden snare that relies on your opponent making a mistake or falling into a forcing line.
Here is an example of Setting a Tactical Trap. The Queen below isn't "trapped" (immobile); she is simply the victim of a calculated combination.
8. Setting a Trap (The Fork)
Xie vs. Yu
The Tactic: White sacrifices the Rook to lure the King into a Fork.
1.Rxf6, gxf6 2.Qh7+, Kf8
3.Nxe6+, Rxe6 4.Rxe6, fxe6
5.Qxc7
The Queen on c7 wasn't "trapped" (she had squares to move to), but she was lost due to a tactical sequence.