Your rating should change based on what your opponents rating was at the begining of your game. Then be added (or subtracted) from what your rating currently is....

So p1.new and p2.old should be used to calculate p1's new rating, and p2.new and p1.old should be used to calculate p2's new rating?

Kevin - what I think should happen - have the ratings change be calculated using the ratings that the game started with. So for example, lets say player 1 gained 10 point, player 2 loses 10 points.

I then think those changes in points should then be applied to the current ratings.

bwildman - I'm bring it up now to see what others think, and if it is a good idea and Fencer agrees - it might be something to look at before he does a the major recalculations. I believe most rating systems are currently based on over the table, live games. This being an on-line site, I believe how ratings are calculated should be adjusted for this time of games.

thats where I see the confusion,Kevin...both players ratings would have to remain the same through the duration of that particuar game...if yo have 100 plus games...how could anyone keep up?

When a game start, P1 is player #1 rating. P2 is players #2's ratings.

After a month or whatever, the game ends. At that time I think the calculation of rating change should use the P1 & P2 value which was from the start of the game (not current).

So using the old P1 & old P2 ratings - a change for each player is calculated.

Then that change that was calculated should adjust the current rating.

Lets say it is the first game of that type for both players when the game begins. You calculate what the bkr would be if the game ended as their only completed games, then be added/subtracted from whatever their BkR really is at the end of the game.

One problem I see is that BKR is calculated in part based on how many games have been played. If I start a game with you which lasts a year, and you finish 50 other games during that time, it wouldnt be fair anymore for my bkr to be calculated like you have played only one game.

good point upchuck! give the man a cigar!! ;-)

good point IMCK - there is probable no perfect way either way since it is currently flawed. If I had to pick between the "2" systems, I would pick the one with the flaw you pointed out since you know about that before you start the game.

But lets think about this a little more - maybe there would be a beter "middle ground". Possible calculate ratings with ratings when the game started, but with current game counts?

No.

LOL:)

One day I'll find even shorter answer :-)