Chaos, The Chess HAppening Organisation System. Chaos is a program that manages single-player chess-tournaments using a font-adaptive full-Intuition-GUI created using MUI. This is an update to version 5.1a. Available pairing modes are: Swiss pairing. Round Robin (FIDE-System). Round Robin (Shift-System). Available output (to printer, screen or file): List of players (short or long). Results. Table (all players or special groups, juniors for example). Table of progress aor Cross Tables (all games of all rounds). Internal ratings and German DWZ (close to USCF-rating or ELO). Localizing (default language is english). Limitations: Number of players limited by RAM (2 KBytes and additional 100 Bytes Stack per player suggested). MUI lib. not included. Include C source, Author: Jochen Wiedmann