Trapped piece
A piece with no safe squares. Surround it, then win it.
Example
The bishop on a2 has almost no way out.
- 1. Kc1: Walk the king over.
- 1... Ke7: Black can’t rescue it…
- 2. Kb2: b1 is covered and b3 is defended: the bishop is trapped.
- 2... Kd6
- 3. Kxa2: And it’s won.
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