Mixed practice is lesson 8 of 8 in Forks, a tactics course suited to players rated around 1300 (improving players). All the ideas of this course, mixed: find the winning move without knowing the motif. It has 5 interactive exercises: 5 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: attack king and queen at once. (2 positions)
White to move: win material with a knight fork.
Black to move: win material with a pawn fork. (2 positions)
Worked examples
White to move: attack king and queen at once. 1.Rb7+ Kc8 2.Rxb5. The rook on b7 forked the king and the queen. You come out 5 points ahead in material.
White to move: attack king and queen at once. 1.d6+ Ke8 2.dxc7. The pawn on d6 forked the king and the queen. You win the queen on c7 and come out 9 points ahead.
chessGM