♟️ About the Organizer

Mariano Loiterstein is an Argentine FIDE Master, chess tournament organizer, competitive player, and promoter based in Mar del Plata, Buenos Aires Province. His official FIDE profile lists him under Argentina with FIDE ID 102849 and confirms his FIDE Master title. He has been closely involved with the chess community of Mar del Plata for many years, combining tournament organization with regular competitive participation and the promotion of chess literature and equipment. Loiterstein also operates Mariano Libros, a specialist bookshop in central Mar del Plata that maintains a substantial selection of chess books, boards, pieces, clocks, and related materials.

🏆 Tournaments and Chess Events

Loiterstein organizes FIDE-rated classical, rapid, and blitz competitions in Mar del Plata and other communities along Argentina’s Atlantic coast. One of his principal recurring events is the Alejandro Judewicz International Rated Tournament, which reached its 13th edition in 2026. The event includes a classical competition and accompanying blitz tournaments, with sections and prizes for players in different rating categories. The 2026 edition is scheduled for August 28–30 at Hotel Garden in Mar del Plata, and Chess-Results officially identifies FM Mariano Loiterstein as its organizer. He is also involved in the Gran Prix del Atlántico, a circuit bringing rated chess competitions to locations such as Mar del Plata, Miramar, and other coastal cities. His tournament announcements provide direct registration assistance, accommodation packages, schedules, prize information, and contact support for participating players.

🌱 Chess Promotion and Community Activity

Beyond tournament management, Mariano Loiterstein contributes to the visibility and accessibility of chess in the region. His public channels regularly promote upcoming competitions, local chess activities, books, educational material, and events organized by clubs and federations across Argentina. Mariano Libros has become a recognizable meeting and contact point for chess players visiting Mar del Plata, while his mobile number is repeatedly published as the official registration contact for his current tournaments. Loiterstein is also an accomplished local competitor. He has won the Mar del Plata Blitz Prix on numerous occasions and continues to participate in nationally and internationally rated events. Through tournament organization, direct communication with players, and chess-related cultural activity, he supports a broad community that includes juniors, amateur competitors, experienced club players, and titled masters.