Friday, July 6, 2018

Season 12, superfinal statistics

Draw rate, wins

Final draw rate was 62%, very low compared to previous superfinals.

Game termination

The three most common game termination causes were:
38% - TCEC win rule
35% - TCEC draw rule
16% - SyzygyTB

Moves per game


The distribution has a right tail but not very long. There were only 8 100+ move games, including one that was exceptionally long at 238 moves.
Time per game (hours)

Median= 4:05

The distribution has a left ridge, almost a bimodal distribution. Of the 25 games that were shorter than 3.5 hours 22 were draws, the medium length for these games was 46.5 moves.


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

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

King's Indian - 14 times
Sicillian - 10 times
KGA - 10 times

Almost all of the book lines had the same ECO codes in reverse games, except for one paired game - games 4.1 and 4.2 were two close variants of the Dutch opening A97 and A98. There were 2 game pairs with different opening variants.

Reverse pairs, wins

There was 5 biased openings with wins for both engines. This is a side effect of the opening choices that resulted in so many decisive games. On the other hand there was one opening where Stockfish won both games, this also happened once in the season 11 superfinal.

Reverse pairs, same moves  

Reverse games diverged very quickly, 40% diverged immediately after book, 74% diverged at most after two plys. Games 47.1 and 47.2 repeated 16 plys after book before diverging, and still Stockfish won as white and drew as black.

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