Here are 10 'mate in 3' puzzles that contain a queen sacrifice on the first or second move. The color of the corner disk indicates who moves first. More sacrifice puzzles can be found here
Here are 10 'mate in 3' puzzles that contain a rook sacrifice on the first or second move. The color of the corner disk indicates who moves first. More sacrifice puzzles can be found here
Here are 10 chess puzzles that illustrate the 'undermining' tactic. The color of the corner disk indicates who moves first. More examples of this tactic with animations can be found here:
