Sacrifices that win is lesson 3 of 8 in Real-game tactics 4: Removing the defender and sacrifices, a tactics course suited to players rated around 1200 (improving 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
Black to move: sacrifice to win. (5 positions)
White to move: sacrifice to win. (2 positions)
Worked examples
Black to move: sacrifice to win. 1...Bxf2+. The sacrifice paid off. The position is winning.
Black to move: sacrifice to win. 1...Ra1+ 2.Kb2 Qxc1+. The had to move, and the behind it was lost. You win the bishop on c1 and come out 3 points ahead.
More in Real-game tactics 4: Removing the defender and sacrifices