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Kasparov has played 12.Nc7+, forking Black's king and a8-rook.

Remove the guard
Distract the piece that's guarding your checkmate square!

Remove the defender.

Super pawn

Discovered attack

It is trickery one

In chess, a sacrifice is a move giving up a piece in the hopes of gaining tactical or positional compensation in other forms. A sacrifice could also be a deliberate exchange of a chess piece of higher value for an opponent's piece of lower value.
Any chess piece except the king may be sacrificed. Because players usually try to hold onto their own pieces, offering a sacrifice can come as an unpleasant surprise to one's opponent, putting him off balance and causing much precious time to be wasted trying to calculate whether the sacrifice is sound or not and whether to accept it. Sacrificing one's queen (the most valuable piece), or a string of pieces, adds to the surprise, and such games can be awarded brilliancy prizes.

另一个经典的 sacrifice ,同时作为开局布局学习。

Another skewer (double)

This time, can you use your white king to skewer
Look easy

Here is a checkmate ,often seen against a castle king.
The king can not take back because the queen is defended by the bishop .

Find the tactic

White to move, checkmate .

Black to move