aman_makhija wrote:

I learnt how the rating changes for wins are calculated

http://www.chess.com/forum/view/general/win-percentages-for-specific-rating-differences

But how does Elo's system calculate the rating changes for draws?

For instance if a 2000 draws a 2100, how many points does he gain with a k-factor of 20?

From the link:

*"K factor x [actual score - expected score]"*

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The "actual score" of a draw is 1/2

So a draw against someone rated 100 points higher would be

20 x [0.5 - 0.35] = 3

A draw against someone rated 100 points lower would be

20 x [0.5 - 0.65] = -3

I learnt how the rating changes for wins are calculated

http://www.chess.com/forum/view/general/win-percentages-for-specific-rating-differences

But how does Elo's system calculate the rating changes for draws?

For instance if a 2000 draws a 2100, how many points does he gain with a k-factor of 20?