Discovered attacks is lesson 9 of 9 in Real-game tactics 9: Master calculation, a tactics course suited to players rated around 2200 (advanced players). Move one piece out of the way and the piece behind it attacks, while the moving piece makes its own threat. It has 6 interactive exercises: 6 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: unleash a discovered attack. (4 positions)
White to move: unleash a discovered attack.
Black to move: mate in 4.
Worked examples
Black to move: unleash a discovered attack. 1...Qh4+ 2.Kg2 Nf5 3.Qe1 Ne3+ 4.Qxe3 Bxe3. Moving the knight opened the line for the bishop on b6. You come out 6 points ahead in material.
Black to move: unleash a discovered attack. 1...Ng4 2.fxe6+ Kg6 3.Qf5+ Rxf5. Moving the king opened the line for the rook on f8. You come out 3 points ahead in material.
chessGM