A movement is the method of progression during the game, indicating the seat to be occupied and the boards to be played by each player at each round.
A. PAIR MOVEMENTS
A club may conduct pair games of any legal size (two and one-half or more tables) using either Howell or Mitchell movements. When 14 or more tables are in play, it is permissible to split the game into two sections, with each section containing at least seven tables. Duplicated boards are desirable but not mandatory.
The most commonly used pair movements are:
MITCHELL: This movement keeps the pairs in two groups, N-S and E-W, with the aim of having all N-S pairs meeting all E-W pairs and playing all the boards. Typically the boards move one table lower and the players one table higher each round. There is a winner for each section for both the N-S and E-W pairs with the highest score.
HOWELL: This movement produces one winner from a field in which all pairs play each of the boards in play, with comparison in direct competition with other pairs on approximately half of the boards, and adverse comparison on the other boards.
B. INDIVIDUAL MOVEMENTS
A club may run individual games (two or more tables) with either Rainbow or Shomate movements:
RAINBOW: This is a movement in which contestants are divided into groups corresponding to their original starting directions, with separate instructions for progressing to each group.
SHOMATE: This movement (also called an irregular rainbow) does not keep the players in a particular group, thus allowing comparison across the field.
C. TEAM MOVEMENTS
A board-a-match team game can be run with a regular board-a-match movement, a Mirror movement, or any other approved movement.
See Chapter 4, Section Seven for information on team events and team movements.