MJ WARRIORS OFFICIAL SITE FOR POINT SYSTEM
This is the site which teach members the basic of how yahoo point system work. Actually I just simply type it from the site http://games.yahoo.com/rules/mahjong/mjscoring.html .  lol

It will also give you an idea what hand you should mahjong in order to win your opponents.

It is not 100 percent correct as the point system is too complicated when the flower come in. Hence, if player follow the point system and still cant win your opponent, do not complain to me lol.
Yahoo Point System
Going mahjong (going out)
Melded (exposed) pong of simples (2 to 8)
Concealed pong of simples
Melded (exposed) pong of terminals (1 and 9)
Concealed pong of terminals
Melded (exposed) pong of honors (Dragons and winds)
Concealed pong of honors
Melded (exposed) kong of simples
Concealed kong of simples
Melded (exposed) kong of terminals
Concealed kong of terminals
Melded (exposed) kong of honors
Concealed kong of honors
Pair of prevailing wind (usually East in tournament)
Pair of own wind 
Pair of dragons
Drawing winning tile from wall (self-pick)
Wining with one chance tile
Pong of dragon
Pong of prevailing wind
Pong of own wind
4 pongs
Going out with last tile
Going out with supplementary tile
No point hand (All chow with no dragon and wind)
Hand of all terminals and honors
Hand with only one suit with honor (3fans and up)
Hand with only one suit (6 fans and up)
Hand of all terminal
Hand of all honors
Flower or season
Flower or season of own wind
All four flowers
All four seasons
+20
+2
+4
+4
+8
+4
+8
+8
+16
+16
+32
+16
+32
+2
+2
+2
+2
+2
x2
x2
x2
x2
x2
x2
x2
x2
x2
x8
limit
limit
+4
x2
x8
x8
Ever wonder why your opponent mahjong all chow and you mahjong 3f , you still lost to him? It is probably when he mahjong he is on the East Seat which he win double points.

Ever wonder you are behind a player , what hand you should make in order to win him?

Sometimes, you have being scolded for mahjong small hand or you yourself get mad when people mahjong small and make you lost the tournament right?

There is no point mahjong small hand when you know you cannot catch up with your opponents right?

Hence, it is nice and more competitive to roughly know the idea of how the point works and try to mahjong on that particular hand.

Below will show an example of what hand you should make and a simple idea how many points the hand you have mahjong with no flower tournament.Those that are not shown. you can use the yahoo system above to do the math your own. lol.



A simple equation

Use the number of points you are behind your opponent and divide it by 4. If you are in the east seat, use the result and divide it further by 2.

For example: Your opponent has 2176 ponts and you have 1956 points.

Step 1: 2176 - 1956   = 220 points
Step 2: 220/4            = 55 points
Step 3: See the below which hand will roughly get you 55 points and do at least the particular hand.

NOTE: EAST seat will win or lost double.
22 to 36 points: Mixed Chow and pong
The points will depend whether do you have any pong/kong, self pick etc. You can simple do your math by using the yahoo point system above. For me, I don't use yahoo point system if i need a KFC hand to win, i will jus depend on luck. Why? Cos i too lazy to count lol.
40 to 48 points: All chows/mixed suit

  
50+ to 60+ points:

a) Mahjong on pair of dragons or good winds with the rest mixed KFC.
b) Conceal pong/kong of dragon or good wind with the rest mixed KFC
  


  
c) 3 fan with pong and chow of same suit with dragon/wind.
d) All Pong without wind and dragon
70+ to 80+ points
a) All Pong with pong of dragon or correct wind.
b) 3 fan with pong and chow of same suit and mahjong on dragon or correct wind.
100 points and above
a) All pong with same suit with dragon and wind
b) All pong same suit  and mahjong on a pair of dragon or good wind.
c) Pure hand
Members who have the screen shot of other that are not shown, you can send to one of the TDs so we can make this site more complete.

The scoring system is what I have either learn or notice in the past, if there is any mistake, don't be too harsh on me lol. Furthermore, when kong and pong of dragon/wind and flower come in , the scoring system will be too complicated to calculate the exact points. I myself will normally try to do the hand to win, but if some reason like player have concealed pong or correct flower. it might not enough. Hence, this is a simple guide for the members and NOT 100 percent correct.

Hope this will make the members roughly get the idea how the yahoo point system work.
Useful Site for Member:
What is Fan?
Backdoor for MJWARRIORS
How to register and check in site for new members
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