KCEC
(Kirr's Chess Engine Comparison)
A tournament of original free chess engines
April 21, 2012
|
Testing summary:
Total: 122,915 gamesplayed by 187 programs 1277 CPU days (X2 4600+) White wins: 49,970 (40.7%) Black wins: 42,759 (34.8%) Draws: 30,186 (24.6%) White score: 52.9% |
Draw Rate
Overall draw rate
Out of 122915 KCEC games played so far 30186 ended as a draw. This makes the overall draw rate of 24.6%.
Draw rate vs rating difference
Naturally the chance to get a draw is higher when both engines are of similar strength:
Each point represents a match of two engines.
Linear regression (blue line in the graph above):
Draw rate = − R.Diff / 21.20 [±2.01] + 28.44 [±0.47]
Draw rate vs average rating
As expected, strong engines make more draws:
Each point represents a match of two engines.
Linear regression (light blue straight line in the graph above):
Draw rate = Av.Rating / 72.16 [±5.68] − 8.22 [±2.60]
Exponential curve (purple curve in the graph above):
Draw rate = exp((Av.Rating − 1829.8 [±212.7]) / 348.74 [±73.28]) + 18.56 [±1.22]
Draw rate vs rating difference and average rating
If you try to use both Rating difference and Average rating, you may end up with something like this:
Draw rate = − R.Diff / 30.83 [±4.41] + exp((Av.Rating − 2184.3 [±120.8]) / 237.57 [±46.63]) + 23.64 [±0.96]