A pairs competition where instead of using a fixed movement the scores accumulated to the end of each round determine who you play on the next round. Pairs with similar scores play each other on the next round.
Using a Swiss Pairs movement is common where the size of the field makes it impossible for each pair to play every other pair. Competitors often like the format because playing more boards against the same opponents adds to the game’s social element and because the coveted green master points are often on offer.