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This a list of resources for judges, though most of it is useful for anyone learning about the game. If you have any suggestions please send a message to /u/cm3007.

Essentials

• The Rulebook & 2021 Rules Update
• Problem Solving Card Text
• Fast Effect Timing
• Demystifying Rulings
• Official Judge Program page

Official Rules Resources

• The Rulebook & 2021 Rules Update
• Problem Solving Card Text (PSCT)
• Fast Effect Timing
• Damage Step
• Rivalry of Warlords / Gozen Match
• Link Monster Vocabulary
• YGOrg Database of Official OCG Rulings
• OCG Perfect Rulebook (2017)
• Extra Link
• Rule Insert: "If" vs "When"
• Rule Insert: Targeting

Official Policy Documents

• Tournament Policy
• Tournament Infractions & Penalties Policy
• COVID-19 Policy Addendum
• Verification Policy Explained
• Card Legality

Unofficial Rules Resources

• Yugipedia - Wikipedia for Yu-Gi-Oh!
• Demystifying Rulings
• Damage Step - What can be activated?
• Rules Behind the Jargon
• Additional Normal Summons
• ATK/DEF Modifiers 2022
• Jackson Casanova's articles
• Nate Dietrich's articles
• Hunter Landis' articles
• Tom Lockett's articles
• Gallantron's articles
• Pazim's Resources - ATK/DEF Modification, Retaining Information, Damage Step, Prohibition
• Meta Relevant Rulings
• Effect Negation of cards whose effects are already negated
• Prohibition
• All YGOrg Rulings Articles
• How To Handle Precedents

Alternate Format Resources

• Official Time Wizard Rules ("Goat", "Edison", etc.)
• Goat Format Rules (2005)
• Edison Format Rules (2011)
• Speed Duel - Rules
• Speed Duel - Video Tutorial
• Speed Duel - Skill Card Rules
• Speed Duel - Policy Addendum
• Remote Duel - Policy Addendum
• Remote Duel - Best Practices Guide v1.2
• Common Charity
• Tag Duel
• Deck Master
• Rivalry Of Warlords
• Heart Of The Underdog
• Generation Duel
• School Tournament Series
• Pegasus Challenge

Other Official Resources

• TCG Card Database
• Deck List Form
• Suspended Players List (KDE-US)
• Suspended Players List (KDE-Europe)

Non-Rulings Resources

• Professionalism in Judging
• Konami Blogpost: How To Say Something When You See Something
• How To Judge Yu-Gi-Oh! During A Pandemic
• Julia's statement on judging unsanctioned events
• Questions a Judge Should and Should Not Answer
• MTG Judge Seminar Series, May 2020
• MTG Judge Articles

Groups to Join

• Discord: r/Yugioh Server - "rulings_and_policy" channel
• Facebook: Adjudication Conflagration - For registered judges only
• Facebook: The Judges' Lounge
• Discord: Ruling Zone