Trade and skewer (3 moves)

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Trade into skewer is a combination where a trade lures an opponent's piece to a square where it can be attacked with a skewer.

Examples

Black can trade knight for bishop with Nxd3.
The queen has to recapture with Qxd3, and is lured to d3, where it can be attacked with the skewer Ba6.
After the queen moves away, Black wins an exchange with Bxf1.

This combination can sometimes happen against a battery, as in the following example:

White has a nice battery of rook, queen, and rook on the f-file. However, capturing Black's knight on f5 was a mistake.
Black can now exchange rooks with Rxf5.
White has to recapture with Qxf5, and the queen is lured to f5, where it can be attacked with the skewer Rf8.
The battery has lost coordination, there is no square that the queen can retreat to and keep the rook on f1 protected.
Note how h3, d3, and b1 are blocked by White's own pieces.
After the queen moves, Black can capture White's now unprotected rook on f1.
In the end, Black has won the rook on f1 for the knight on f5, and is an exchange up.

Related combinations

It is also possible to use a trade to lure a piece to a square where it can be attacked in a subsequent tactic other than a skewer.
Instead of a trade, a decoy uses a piece sacrifice to lure a piece to a square.