GM Jan Werle’s "The Smart Ruy Lopez - Part 2" on Chessable offers a strategic, low-theory repertoire designed to neutralize the Berlin Defense (3... Nf6) using the 4. d3 system, aiming to keep complex positions for white. The course emphasizes positional understanding over heavy memorization, providing over 2.5 hours of video instruction focused on achieving a "positional crush". For more details, visit Chessable . The Smart Ruy Lopez - Part 2: Break Down the Berlin Defense