Zhukov against Galder

The book of Valentin Aleksandrovich Runov talks about the initial stage of the Great Patriotic War - the retreat of the Soviet troops under the blows of the Wehrmacht and their heroic struggle against an experienced and merciless enemy.
The events of the first months of the war are served as a kind of duel of the two military leaders - G.K. Zhukov, the head of the General Staff of the Red Army, and F. Galder, who held the position of chief of the General Staff of the Ground Forces of Germany. The book allows you to look at the events of that time from the point of view of staff officers, presenting the operations of the troops as a chess party of two experienced players.
What is the reason for our defeats of the first months of the war? This was due to only the numerical and high -quality superiority of the enemy or is it much more complicated? The author of the book tries to give answers to these questions, based on archival documents and diaries of people who participated in those dramatic events