elo-rating and scores in general

hi there,

i'm one of the developers of cultris (http://cultris.ath.cx/). it's a multiplayer tetris with an online high score table. up to 10 players can play simultaneously.

right now the score calculation of a player goes like this:
1. if you lose a match, your score decreases by 1 point
2. if you win a match with [n] players you get [n] points
3. you loose 3 points every day.



but that's not fair, because winning against tough opponents should give more points than beating up unskilled players. then i thought about elo-ratings in chess. but i have 2 open questions before i can implement that:

1. how should i calculate the scores in matches with more than 2 players. formula, anyone?
2. i want that high scores degrade after some time (otherwise good players might be "forever" on the high score table). can i do that? is it advisable to do so?
3. are there any other, maybe better rating systems?



i'm not really a math pro, so go easy on me. :)

regards,
simon

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