Take the outcome of a draw in ELO formula Is there any way to get the probability of a draw outcome using ELO formula as it only gives the Win probability
ELO formula is given by $E = \frac{1}{1+10^\frac{d}{a}}$ where d is the difference in ELO Rating and a is a constant
 A: To quote Wikipedia

A player's expected score is his probability of winning plus half his
  probability of drawing. Thus an expected score of 0.75 could represent
  a 75% chance of winning, 25% chance of losing, and 0% chance of
  drawing. On the other extreme it could represent a 50% chance of
  winning, 0% chance of losing, and 50% chance of drawing. The
  probability of drawing, as opposed to having a decisive result, is not
  specified in the Elo system. Instead a draw is considered half a win
  and half a loss.

You could combine Elo predictions with information outside the Elo system about the propensity of draws given different strengths of paired players, but this would be external to the Elo system.  Here is one possible set of distributions, though there are many others and you cannot sensibly choose one without more information.
E[score]    P(win)  P(draw) P(lose)
0.0         0.00    0.00    1.00
0.1         0.01    0.18    0.81
0.2         0.04    0.32    0.64
0.3         0.09    0.42    0.49
0.4         0.16    0.48    0.36
0.5         0.25    0.50    0.25
0.6         0.36    0.48    0.16
0.7         0.49    0.42    0.09
0.8         0.64    0.32    0.04
0.9         0.81    0.18    0.01
1.0         1.00    0.00    0.00

