With his qualification to the 2026 Candidates, GM Matthias Bluebaum is getting even more attention as a top theoretician. Why not take the opportunity to learn his reliable and practical way to handle Black against the Reti and Catalan setups? My Database presents Matthias unique set-up, which works for both openings: Reti (different White set-ups) and Catalan. In recent years Matthias has played this idea in massive amounts of games with incredible results. As always, my Database covers all main lines in great details including many improvements and some new dangerous ideas for White. I am pretty sure this material will serve you for many years ahead!