teams do not play each other twice. Software may be employed to do pairings, and in the early rounds it will match teams with approximately the same score but it will not result in a precise 1 vs 2, 3 vs 4, etc. This is done so that matches can begin before all teams have finished the previous round. In later rounds, the pairings are slower but more exact. In the last one or two rounds there may be a switch to the Danish system to make sure that each team plays the final match according to its actual ranking, even if this results in some teams playing against an opponent a second time. At least in the US, this is extremely rare, usually employed only in small club games with a large number of rounds relative to the number of teams. Chess In chess, each player is paired against another player with an equivalent performance score. In "Round 1" of a chess tournament paired using the Swiss System, players usually are seeded according to their known playing strength, often a rating assigned to them by their local club, their national federation, or the world chess federation (FIDE). In some events, especially when none or few of the players have an official chess rating, the players are paired randomly. Once play begins, players who win receive a point, those who draw receive one-half of a point, and those who lose receive no points. Win, lose or draw, all players proceed to the next round where winners are paired against opponents with equal performance scores (e.g. Round 1's winners play each other, Round 1's draws play each other, etc.). In later rounds (typical tournaments have anywhere from 3-9 rounds), players face opponents with the same (or almost the same) score. No player is paired up against the same opponent twice. The rules for Swiss System chess events also try to ensure that each player plays an equal number of games with white and black. Alternating colors in each round is the most preferable and the same color is never repeated three times in a row. Players with the same score are ideally ranked according to rating. Then the top half is paired with the bottom half. For instance, if there are eight players in a score group, number 1 is paired to play number 5, number 2 is paired to play