Erwich: 100 Tactical Patterns You Must Know - WorkbookPractical Exercises to Find Winning Chess Moves This workbook offers over five hundred carefully selected exercises to accompany the book 100 Tactical Patterns You Must Know. Experienced chess trainer Frank Erwich has not only identified the 100 most important tactical patterns, he has also collected hundreds of exercises for you to train these patterns. Solving these puzzles will drive home the key ideas, refresh your knowledge and improve your