TRF

TRF is a TypeScript parser and serializer for the FIDE Tournament Report File format — the standard interchange format used by all FIDE-endorsed pairing software (JaVaFo, bbpPairings, Swiss Manager, Vega).

Parses TRF strings into a fully-typed Tournament object and serializes them back. Zero runtime dependencies.

Installation

npm install @echecs/trf

Quick Start

import { parse, stringify } from '@echecs/trf';

const tournament = parse(trfString);

console.log(tournament.name); // "My Tournament"
console.log(tournament.rounds); // 9
console.log(tournament.players[0].name); // "Player0001"
console.log(tournament.players[0].rating); // 2720
console.log(tournament.players[0].results); // [{ round: 1, color: 'w', opponentId: 4, result: '1' }, ...]

const trf = stringify(tournament); // back to TRF string

Usage

parse()

import { parse } from '@echecs/trf';

function parse(input: string, options?: ParseOptions): Tournament | null;

Takes a TRF string and returns a Tournament object, or null if the input cannot be parsed.

• Strips BOM and surrounding whitespace automatically.
• Never throws — parse failures call options.onError and return null.
• Recoverable issues (unknown tags, malformed fields) call options.onWarning and continue parsing.

import { parse } from '@echecs/trf';

const tournament = parse(trfString, {
  onError: (err) => console.error(`Parse failed: ${err.message}`),
  onWarning: (warn) => console.warn(`Warning: ${warn.message}`),
});

Result codes

Round results on each player use the following codes:

Code	Meaning
1	Win
0	Loss
=	Draw
+	Forfeit win
-	Forfeit loss
F	Full-point bye
H	Half-point bye
U	Unplayed
Z	Zero-point bye

stringify()

import { stringify } from '@echecs/trf';

function stringify(tournament: Tournament, options?: StringifyOptions): string;

Takes a Tournament object and returns a TRF16 string.

• Never throws.
• Omits optional header fields when absent.
• parse(stringify(t)) roundtrips cleanly for any valid Tournament.
• Warns (via options.onWarning) when a player string field exceeds its column width and will be truncated.

import { parse, stringify } from '@echecs/trf';

const t1 = parse(trfString)!;
// ...modify t1...
const updated = stringify(t1, {
  onWarning: (w) => console.warn(w.message),
});

Using with @echecs/swiss

@echecs/trf has no dependency on @echecs/swiss by design. To use a parsed tournament as input to the Swiss pairing functions, adapt the types in your own code:

import { parse } from '@echecs/trf';
import { dutch } from '@echecs/swiss';

import type { Tournament } from '@echecs/trf';
import type { Game, Player } from '@echecs/swiss';

function toPlayers(tournament: Tournament): Player[] {
  return tournament.players.map((p) => ({
    id: String(p.pairingNumber),
    rating: p.rating,
  }));
}

function toGames(tournament: Tournament): Game[] {
  const games: Game[] = [];
  for (const player of tournament.players) {
    for (const result of player.results) {
      if (result.color !== 'w' || result.opponentId === null) continue;
      let score: 0 | 0.5 | 1;
      if (result.result === '1' || result.result === '+') score = 1;
      else if (result.result === '0' || result.result === '-') score = 0;
      else if (result.result === '=') score = 0.5;
      else continue;
      games.push({
        blackId: String(result.opponentId),
        result: score,
        round: result.round,
        whiteId: String(player.pairingNumber),
      });
    }
  }
  return games;
}

const tournament = parse(trfString)!;
const pairings = dutch(toPlayers(tournament), toGames(tournament), 5);

Types

interface Tournament {
  chiefArbiter?: string;
  city?: string;
  endDate?: string;
  federation?: string;
  name?: string;
  players: Player[];
  rounds: number;
  startDate?: string;
  timeControl?: string;
  version: Version; // 'TRF16' | 'TRF26'
}

interface Player {
  birthDate?: string;
  federation?: string;
  fideId?: string;
  name: string;
  pairingNumber: number;
  points: number;
  rank: number;
  rating?: number;
  results: RoundResult[];
  sex?: Sex; // 'm' | 'w'
  title?: Title; // 'GM' | 'IM' | 'FM' | ...
}

interface RoundResult {
  color: 'b' | 'w' | '-'; // '-' = no color assigned (bye/unplayed)
  opponentId: number | null; // null for byes
  result: ResultCode;
  round: number;
}

interface ParseWarning {
  column: number; // 1-based column in the source
  line: number; // 1-based line in the source (player index for stringify)
  message: string;
  offset: number; // byte offset in the source (0 for stringify)
}

interface StringifyOptions {
  onWarning?: (warning: ParseWarning) => void;
}

TRF Format Reference

The Tournament Report File (TRF) format is defined in the FIDE Handbook. The current version is TRF16; TRF26 was introduced alongside the 2026 Dutch pairing rules.

License

MIT