Elias frowned. "Survive? It's a puzzle. You win," he muttered to the empty room.
To maximize your improvement, Erwich's book should be used actively, not passively. Here’s a study method you can follow: 1001 chess exercises for advanced club players pdf
(Answer idea: 1. Qd2! defending f2, then Rxe7 – small move, huge difference.) Elias frowned
The book is widely available in both physical and digital formats: 1001 Chess Exercises for Advanced Club Players Erwich's book should be used actively