Sacrifices that win is lesson 3 of 9 in Real-game tactics 8: Deep combinations, a tactics course suited to players rated around 2000 (strong club players). Giving material is fine when you get more back. Calculate the line to the end before you let the piece go. It has 7 interactive exercises: 7 calculated lines from real positions. You play every move on a board and get feedback straight away. The lesson is free.
What you practise
White to move: sacrifice to win. (3 positions)
Black to move: sacrifice to win. (4 positions)
Worked examples
White to move: sacrifice to win. 1.Nxd5 exd5 2.e6. The knight sacrifice on d5 dragged the pawn away from its duty. The position is winning.
Black to move: sacrifice to win. 1...Ne5 2.Qe2 Nxg4. The knight on e5 attacked the queen and the knight at once. You win the knight on g4 and come out 3 points ahead.