Chess Arbiter is your pocket reference for tournament chess - built for players, arbiters and organizers who need clear, reliable answers fast.

From the official Laws of Chess to rating calculations and tiebreak rules, everything is explained in plain language and organized so you can find what you need in seconds, even in the middle of a game or tournament.

WHAT'S INSIDE

- Laws of Chess
The official rules explained clearly: how the pieces move, castling, en passant, promotion, touch-move, illegal moves, draws, and clock rules. Ideal for settling disputes and preparing for rated play.

- Tournament Systems
Understand how Swiss, round-robin and other tournament formats work, how pairings are made, and what to expect before round one.
- Rating Calculator
Learn how chess ratings work and calculate your rating change after every game or event. Keep a record of your tournament history and follow your progress over time.

- Tiebreaks Explained
Buchholz, Sonneborn-Berger, direct encounter, number of wins and more – see exactly how each tiebreak is calculated, so final standings always make sense.

WHO IT'S FOR
- Tournament players who want to know the rules and track their rating
- Arbiters who need a quick, dependable reference at the board
- Organizers preparing events and explaining standings to players
- Coaches and parents helping young players get ready for competition

WHY CHESS ARBITER
- Clear, structured explanations – no rulebook jargon
- Picks up where you left off, so you can return to the rule you were reading
- Regularly updated content

Whether you're preparing for your first rated tournament or running one as an arbiter, Chess Arbiter keeps the rulebook in your pocket