Schachverein Horn Union Ratten is an Austrian chess club and local tournament organizer based in Ratten, Styria, Austria. Over the years, the club has become closely associated with one of the region’s most consistent annual open events. As a result, it is recognized for structured planning, clear regulations, and dependable round management.

In addition, the club runs the International Raiffeisen Schach-Open Ratten, including the 30th edition in May 2026. The event is designed as a multi-section open chess tournament with A, B, and C groups, plus a separate blitz chess competition. Moreover, the main groups are played as classical chess and are submitted for FIDE-rated tournament processing where applicable.

Furthermore, Horn Union Ratten emphasizes fair play and a calm playing hall environment. For example, the tournament regulations include strict rules on phones and conduct, which supports focused competition. Consequently, the event attracts ambitious juniors, improving club players, and experienced visitors looking for serious weekend chess in rural Styria.