Mixed practice is lesson 8 of 8 in Quiet moves, a tactics course suited to players rated around 1400 (club 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
Black to move and win: the key move is quiet. (2 positions)
White to move: trap a piece.
White to move and win: the key move is quiet. (2 positions)
Worked examples
Black to move and win: the key move is quiet. 1...Ke7. The quiet Ke7 left the opponent without a good answer. The position is winning.
White to move: trap a piece. 1.Bxc7 O-O 2.Bxd8. The queen on d8 had no safe square left and was lost. You win the queen on d8 and come out 7 points ahead.