Two interesting book on pattern recognition training have been written by Van de Oudeweetering.
I try to read a chapter a day. Just finished ch30 A Practical Piece Sac.
There are 40 chapters, each with some lightly annotated games and also 40 exercises.
Chapter 1 A Very Powerful Piece: The Octopus(just a couple of the examples inserted with shortened notes)
The format is similar in this sequel with 37 chapters and 37 exercises.