13 languages

Chess Pairing Software - ChessPairings.org

Swiss pairings, Round Robin, 28 tiebreak systems, TRF export, and FIDE 2026 compliance. Runs on bbpPairings v6 and TieBreakServer. Free.

Swiss pairings Supports Dutch, Dubov, Burstein, and Lim workflows.
Tiebreak engine All 28 FIDE-recognized systems, calculated automatically.
Browser-based No install. Share public links for pairings, standings, and registration.
Formats TRF-16, TRF-25, marathon events, team events, and predictor tools.
ChessPairings tournament screen with pairings, standings, and tiebreaks
Live standings Pairings and rankings Public tournament pages update during the event.
FIDE workflow TRF and tiebreaks Export formats and calculations used by arbiters.
Pairing engine bbpPairings v6 Same open-source engine FIDE uses as reference implementation for the Dutch system. Written in C++, actively maintained since 2014.
Tiebreak engine TieBreakServer Handles all 28 FIDE-recognized tiebreaks.

13 languages

Each edition has its own homepage, tools, and guide pages.

I started ChessPairings.org because I wanted a free, FIDE-compliant tool I could use at the tournaments I run myself — and keep improving as I went. The forum link above is the fastest way to reach me with bugs or feature requests.

— Stefano Loberti

What you can run

Common tournament workflows supported by the public site and the browser app.

Swiss events Open tournaments, weekend events, youth festivals. Use the Swiss pairing engine, publish standings after each round, and export TRF files for rating submission. Best fit for medium and large fields.
Round Robin Club championships, invitationals, small sections. Single or double Round Robin with automatic crosstables.
Teams and leagues Team events with board results and published standings. Rosters, board pairings, team standings, and public pages — all in one tool. Includes team-specific ranking workflows.

Now available for WordPress

Show your ChessPairings tournaments on your own WordPress site — standings, pairings, players and calendar. Free official plugin.

Discover the plugin

Live Tournaments

Recent public tournaments running on ChessPairings.org.

Intercolegial Unitrinus - Mód. 2 Masc. 2026 In corso
CRES 28 May 2026
7 players Round 3/4 swiss
Intercolegial Unitrinus - Mód. 1 Masculino 2026 In corso
CRES 28 May 2026
6 players Round 3/4 swiss
INEM Torneo1 In corso
27 May 2026
24 players Round 1/10 swiss
PRACTICA 3.1 In corso
26 May 2026
12 players Round 1/2 swiss
Enigmáticos por correspondencia In corso
25 May 2026
10 players Round 1/5 swiss
TH Swiss League S2 In corso
Team Haiti/Chess.com 25 May 2026
7 players Round 2/6 swiss
Ajedrez rápido 2026 Sabanalarga In corso
23 May 2026
11 players Round 5/5 swiss
Demo In corso
23 May 2026
9 players Round 2/5 swiss
Torneo Sabanalarga In corso
22 May 2026
6 players Round 2/5 round robin
Concordia Chess Classic Open - Spring 2026 In corso
Concordia Club 21 May 2026
13 players Round 1/5 swiss

Recent forum threads

Latest threads.

💡 suggerimenti Extra points
1 replies 15 May
💬 discussioni-generali Tips for Running a Successful Chess Tournament
2 replies 26 Mar
📖 faq Understanding Color Allocation in Swiss Tournaments
0 replies 25 Mar
📖 faq How to Import Players from the FIDE Rating List
0 replies 25 Mar
📖 faq How to Set Up a Round Robin Tournament
0 replies 25 Mar
📖 faq How to Handle Byes, Withdrawals, and Forfeits
0 replies 25 Mar
Open the forum →

Changelog

v5.13.3 Feature May 29, 2026

Added

  • API keys for everyone — Every account can now generate a personal API key from Profile → API to power the WordPress plugin. Previously this was limited to administrators. Keys are per-user, read-only, and only expose your own tournaments.
  • WordPress plugin highlight — A banner on the logged-in home links to the plugin showcase, so organizers can display their tournaments on their own WordPress site.
Open full changelog →

What it does not do

A few things the app intentionally does not handle today:

  • USCF pairing rules. The engine follows FIDE Dutch, Dubov, Burstein, and Lim. USCF-specific rules are not implemented.
  • Haley accelerated pairings. Not supported. Standard Swiss acceleration is not currently part of the pairing workflow.
  • FIDE-rated online events. The workflow targets over-the-board tournaments. Online rating submission is outside scope.

FAQ

Is ChessPairings.org really free?
Yes. ChessPairings.org is free to use. The pairing engine bbpPairings and the tiebreak engine TieBreakServer are open source, with no subscriptions or feature tiers.
Does it comply with FIDE 2026 rules?
Yes. ChessPairings.org already implements the FIDE Dutch system pairing rules (2025 edition, effective February 1st, 2026) via the bbpPairings open-source engine, making it one of the first platforms to be fully compliant.
What tiebreak systems are supported?
All 28 FIDE-recognized tiebreak systems, powered by the TieBreakServer open-source engine. This includes Buchholz, Sonneborn-Berger, Progressive Score, Average Rating of Opponents, and many more.
In how many languages is it available?
13 languages: English, Italian, Spanish, French, German, Polish, Turkish, Russian, Dutch, Portuguese, Norwegian, Hindi, and Chinese.

Open-source engines

The site uses two open-source engines: one for pairings, one for tiebreaks.

bbpPairings High-performance Swiss pairing engine written in C++. Implements the FIDE Dutch system rules (2025 edition, effective 2026) with weighted matching algorithms for optimal, fully compliant pairings. Pairing Engine TieBreakServer Python-based tiebreak calculation server. Handles all 28 tiebreak systems according to FIDE specifications, with support for TRF-16/TRF-25 formats and comprehensive tournament data validation. Tiebreak Engine