Dief 2025 | Welcome to Diefenbaker Cup 2025

T4 Beginner 2025

T4 Intermediate 2025

T2 Beginner Nov 1 2025

Tournament 1 BP 2025

BP Qualifier 2025

T2 Intermediate 2025

T2 Français 2025

T3 Intermediate 2025

T3 Beginner 2025

T4 Français 2025

T5 Beginner 2025

T5 Intermediate 2025

T6 Beginner 2026

T6 Intermediate 2026

T7 Intermediate 2026

T7 Beginner 2026

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👋 Welcome to Diefenbaker Cup 2025

Dief 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 $31. 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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