Double-Swiss system

In the Double-Swiss system, a round does not pair two players for just one game. Each pairing creates a two-game match played in succession, with the players alternating colours between the first and second games. Each game contributes points, so ordinary match scores include 2-0, 1.5-0.5, and 1-1.

It remains a Swiss system because each round's opponents are determined from the state of the tournament and its pairing rules; it does not mean that every participant plays everyone else. The word 'double' describes the two games inside each pairing.

The International Chess Federation (FIDE) also specifies that byes, whether requested or allocated, apply to the whole match, never to only one of its two games. If an odd number of players must be paired, the allocated bye normally awards points equivalent to winning one game and drawing the other, unless the tournament regulations state otherwise.