Gajewski recommends a 4. d3 system to avoid the famous "Berlin Wall" and steer Black into atypical, fighting positions.
The author shares insights into his own discovery within the Ruy Lopez. Philosophy and Difficulty Chessable LTR Gajewski 1 E4 Part1 7z 009
High praise is often given to Gajewski's explanations of pawn structures and middlegame plans , helping players understand the why behind the moves. Gajewski recommends a 4
While suitable for ambitious improvers, it is highly recommended for players at the 1800+ FIDE level due to its depth (it contains approximately 2,000 variations). Chessable LTR Gajewski 1 E4 Part1 7z 009