Two kinds of pairs game are recognised: the 'standard' form, where play alternates between the pairs, and the 'block-and-smash' form, where both members of a pair play in succession. The former is the one used for Grandmaster-level Championships: the latter is generally limited to informal games.
Normally the worst of enemies, perhaps the greatest pairs team of all time was formed in 1965 when Mrs Trellis and Eamon Ruttsborough agreed to bury their differences for the course of the championship: her defensive abilities combined with his attacking ingenuity swept all challengers aside and won the championship without conceding a single token holding in any of their games. However, this pair only existed for two weeks: out of pairs that played together over a period of years, perhaps the combination that stands out the most is that of Crumblethorpe and Chuntwumble, although Trellis and Trentwimble were also pretty formidable in their day.
[JLE]