Monday, November 20, 2017

Season 10, stage 2 stats

Draw rate, wins

Final draw rate was 67%, better that expected for the stage.

Game termination

The three most common game termination causes were:
37.5% - TCEC draw rule
31.3% - TCEC win rule
15.2% - TB position

There were two crashes by Andscacs and Booot. As a result of Andscacs' crash in a winning position it was left out of the top 6 while Ginkgo is in.

Moves per game

Median= 59.3
Average= 63.6

The distribution is similar to stage 1, about 9% of the games were longer than 100 moves.

Time per game (hours)

Median= 2:55
Average= 2:49

The engines in stage 2 had half an hour more time per game, compared to stage 1. The games were slightly less than an hour longer.

There were variable length book openings in this stage chosen by Cato.
The first letter of the ECO codes was distributed as follows:

An almost uniform distribution.

If we use the opening 'family name' (using format FAMILY_NAME: VARIANT....) the top 3 are:

Sicillian - 12 times
King's Indian - 10 times
Spanish - 10 times

Some of the book lines were short enough to allow different ECO codes in reverse games, this happened in 10/56 paired games.

Reverse pairs, wins

There were no biased openings in the stage, an excellent result though Cato stated that this may be indicate that the openings chosen were not biased enough. There were decisive results in 61% of the openings.

Reverse pairs, same moves 

Reverse games diverged very quickly, 41% diverged immediately after book, 68% diverged at most after two plys.

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