MP:- Match point
In the match point system (MP), each score is compared with all other scores who is achieved on other tables playing the same board.  The goal is to get the highest score possible for your side.  Even an overtrick or the 10-point difference between NT and a major contract may decide if you get a top or a bottom MP-score.
Scoring: where TA = the number of tables who has played the board.

In JBridge the number of tables who has played a board will change, so it would be injustice to use MP-score, because if you for example get a top MP-score with 20 tables, you get 38 MP, but only 18 if the number of tables is 10.  The MP-score is therefore calculated in % of the top score for each board.

Example: a board played by 5 tables:
Score MP MP Score %
Contract Declarer tricks NS EW NS EW NS EW
4 N 10 420 8 0 100 0.0
3 S 9 400 5 3 62.5 27.5
3 S 9 400 5 3 62.5 27.5
3 N 10 170 2 6 25.0 75.0
4 N 9 50 0 8 0.0 100
IMP:- Butler International Match Points.
IMP-score is usually used in team matches, but it is also used in pair tournament and then it is often called Butler.
When you are scoring with IMP, you take your score on a board and compare it with another score.  In teams the other score is the score achieved by the other table in the match. In pairs the result is calculated against the average of the field score, worst and best score not included in the average.  Then converted to IMP score.

International Match Points:
Raw Score IMP Raw Score IMP Raw Score IMP Raw Score IMP Raw Score IMP
0-10
20-40
50-80
90-120		 0
1
2
3		 130-160
170-210
220-260
270-310		 4
5
6
7		 320-360
370-420
430-490
500-590		 8
9
10
11		 600-740
750-890
900-1090
1100-1290		 12
13
14
15		 1300-1490
1500-1740
1750-1990
2000-2240		 16
17
18
19

Example: a board played by 5 tables.
Score IMP
Contract Declarer Tricks NS EW NS EW
4 N 10 420 +4 -4
3 S 9 400 +4 -4
3 S 9 400 +4 -4
3 N 10 170 -3 +3
4 N 9 50 -8 +8
Average = +270

XIMP:- Cross Fields International Match Points.
Every score is compared against each other, accumulated IMP's as total.  So whatever you do, try to avoid disaster because they will hurt you!
Example:a board played by 5 tables.
Score Score IMP XIMP
Contract Declarer Tricks NS EW Difference NS EW
4 N 10 420 = 20+20+250+470 = 1+1+6+10 +18 -18
3 S 9 400 = -20+0+230+450 = -1+0+6+10 +15 -15
3 S 9 400 +15 -15
3 N 10 170 = -250-230-230+220 = -6-6-6+6 -12 +12
4 N 9 50 = -470-450-450-220 = -10-10-10-6 -36 +36
TG:- Teamgame.
Imp'ed boards, 2 tables only. Two teams, with 4 players each, play against each other.

Example here, RED/BLUE are different teams.
Open room Closed room
NS - Teamname
Everlast		 EW - Teamname
Golden4		 NS - Teamname
Golden4		 EW - Teamname
Everlast
North
Zia		 North
Soloway
West
Garrozzo		 East
Chagas		 West
Forque		 East
Chelma
South
Rosenberg		 South
Goldman

Serve two tables, 2 from each team join each table.
Sit according to the above example.
All players now click New Board, and teamgame is started.