// Package pgn implments an importer and exporter for the Portable Game Notation(PGN).
// It provides an interface for efficiently reading and writing PGN files using buffered IO.
//
// PGN is the defacto standard format for storing and exchanging chess games. It is a cleartext
// format that is both human- and machine-readable. Most chess libraries and frameworks have some
// kind of built-in support for reading and/or writing PGN files.
//
// Spec: https://www.chessclub.com/help/pgn-spec
//
// Usage:
//
//		f, _ := os.Open("file.pgn")
// 		parser := pgn.NewParser(bufio.NewReader(f))
//		for {
//			game, err := parser.Next()
//			if err != nil {
//				log.Fatal(err)
// 			}
//			fmt.Println(game)
//			if game == nil {
//				return
//			}
//		}
package pgn