Chess Puzzles by GMs Blog

The 'pin' tactic - 10 illustrative examples. The color of the corner disk indicates who moves first.

 The 'undermining' tactic - 10 illustrative examples.  The color of the corner disk indicates who moves first. 

Here are 10 'mate in 3' puzzles that contain a knight sacrifice on the first or second move.  The color of the corner disk indicates who moves first.