Samarian: Das systematische Schachtraining - Offizielles Lehrbuch des Deutschen Schachbundes grundlagen With his first two moves

With his first two moves

die auf Mattideen gegen den feindlichen König beruhen

I cannot recommend this book highly enough

could Bobby enter the contest

Samarian: Das systematische Schachtraining - Offizielles Lehrbuch des Deutschen Schachbundes grundlagen With his first two movesSystematic structure of training, training methods, strategies and combinations. This first official training book of the German Chess Federation enables every club player, but also instructors and trainers, to teach systematically. Each topic is provided with review questions. For individual and group lessons. 159 diagrams, 152 pages, 10th edition 2019, paperback.