Amsterdam Open 2025 | Institutions

Amsterdam Open 2025

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Amsterdam Open 2025 runs on Tabbycat 2.11.0-c (Tonkinese - Calico)

Tabbycat is an open-source project developed by volunteers and is free to use. For a tournament of this size, we suggest a donation of $75. Learn more about donating.

Still timing debates with the stopwatch app?

Using an app designed for debate timekeeping makes speaking and adjudicating easier! Check out Timekept (iPhone/iPad) or Debatekeeper (Android).

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Tabbycat is supported by the Tabbycat Debate Association, a non-profit for advancing open debate technology.

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