I'm new to Mahjong. I only played 3-5times. Don't fully understand most of it yet. Especially the scoring of it all. =[
Also IRC on box right?
Scoring is a bit strange to tell the truth.
Here is how it works.
To be able to win with a hand it need to contain a "Yaku". Yaku is a pattern which follows some certain rules. A common yaku are for example Tanyao aka All simples, a hand that only contains numbered tiles 2-8. Riichi is another common yaku which can be used to either give hand with no yaku one, or increase the value of hand.
Every Yaku has a certain "Han/Fan" value. Tanyo is worth 1 han while Toitoihou (all pons) are worth 2 for example. Several Yaku can be combined for even higher scores. Each Han is a score multiplier.
To get the score you first need to calculate the base value of the hand. It's generally 20 (or 30 in the case of closed hand winning on a discard) + points for pons/kans and specific waits. The final value is rounded up next even 10 and usually lands on either 30 or 40 but can go as high as 110. This base score is called "fu" (minipoints).
To get the total value of the hand you take the base score and double it once for every Han + 2 extra times (3 in the case of East winning), in math language it's written as score=fu*(2^(han+2). The value you get is the score everyone needs to pay in case of winning on a selfdraw. The score is rounded up to the next even 100. East pays double for selfdraw wins so you get total 4 times the score.
In case of the winning on a discard the discarder pays the total value so 4x the score, rounded up to 100 after multiplying.
If east wins it's just 3x (no east that can pay double) but as said above his score is doubled one more time so his final score ends up 1.5x that of the other players.
Scoring example:
40 base points, 3 han.
40*(2^(3+2)= 40 * 32 = 1280.
If winning on selfdraw that means every one pays 1300 point while east pays 2600.
If winning on discard the discarder pays 1280*4 = 6400.
Once you reach 8000 points (12000 for east) or 5 Han (which always results in a score of 8000+) you get a limit hand. From this point your base score does no longer matter, only Han.
5 Han = Mangan = 8000
6-7 Han = Haneman = 12000
8-9 Han = Baiman = 18000
10-12 Han = Sanbaiman = 24000
13+ Han = Yakuman = 36000
East win 50% more so 12000/18000/24000/36000/48000 instead.
Normally you don't need to know this math. Instead you use ready made tables where you cross check Fu and Han and get the score from that.