Board-A-Match is a form of scoring used in team games (usually only at major National Championships).
Each team has a N-S and E-W pair facing their counterparts from the other team.
Instead of the more common "IMP" comparison (where, for example +620 at one table is compared with, say down 1, -100 at the other table for a 720-point swing converted to 12 IMPs), the BAM score is either a "WIN" or a "LOSE". If the N-S pair is +620 and the E-W pair at the other table is +100, the result is "1" -- a full win. If you are -800 and -2,000 it is simply a loss or "0." If both tables achieve the same score, say +620 at each table, it is a tie and 0.5 for each team.
You can win a board in BAM by the smallest of margins. If your N-S pair is +130 in a diamond partial, and your counterparts play in 2NT, making 120, you get a full 1.0 (WIN) on the board!
In a session the East-West pairs move from table to table and play several deals against different North-South pairs. After the session the East-West pair goes back to their teammates and all the boards are compared.
last updated: June, 2012