Sonneborn–Berger score

The Sonneborn–Berger score (or the Neustadtl score) is a scoring system often used to break ties in chess tournaments. It is computed by summing the conventional score of each defeated opponent, and half the conventional score of each drawn opponent. The main point is to give more value for a win/draw against a player ranked high, than for a win/draw against a player ranked low in the tournament. Since players may share the same Neustadtl score, further means of breaking ties may be required; common methods include considering the score in games played between the tied players or favouring the player with the most wins. Neustadtl remains the most common tie-breaking method in round-robin tournaments, though in case of nessecity it is used in other types of tournaments, where the players, who should be distributed, have played equal number of games.