TalkChess.com

[Adam Hair]

In the past few months, several people (such as Peter Österlund and myself) have measured the increase in Elo per doubling of time control. The increases discovered in each case was, on average, much higher than the often quoted range of 50 to 70 Elo per doubling of speed (which is emulated by doubling the time control). However, one objection that has been raised is that the time controls are too short. While I do not believe the previous results were invalid, I do know that the short base time control added noise to the measurement. So, I decided to test the Elo increase per doubling at a longer base time control.

I used Gaviota 0.85.1 64-bit as the engine to measure.

Gaviota played against 10 opponents (Jonny 4.00, SmarThink 1.20 64-bit, Glaurung 2.2 64-bit, Booot 5.1.0, Quazar 0.4 64-bit, Nemo 1.01b 64-bit, Naum 4.2 64-bit, Gull 1.0a 64-bit, Spike 1.4, Hannibal 1.1 64-bit).

The base time control was 1 minute + 1 second per move.

I randomly choice 100 positions in epd format to use for all games, with each position played with reversed colors so that there was 200 games played for each match.

Gaviota played a gauntlet against the opponents at the base time control, and then it played with 2 times, 4 times, and 8 times the base time control

The following ratings were computed with Bayeselo with the commands "mm 0 1" and "covariance":