Thursday, June 14, 2018

Season 12 premier division statistics

Note: I disregarded the 5 Chiron games in the report.

Draw rate, wins


Final draw rate was 64.3%.

Game termination

The three most common game termination causes were:
35.7% - TCEC win rule
34.5% - TCEC draw rule
14.9% - 3-Fold repetition, SyzygyTB

There was no games that ended in a crash, other than Chiron's 3 crashes that led to its early disqualification.  

Moves per game


Median= 61.5
Average= 65.8

There were 11 games with more than 100 moves, including one with 184.5 moves (Komodo - Fire, round 42)

Time per game (hours)

Median= 3:02
Average= 2:54

Note the left tail, some games tended to be shorter than expected. This is a well known TCEC phenomenon where in late stages some engines lower their eval and agree on draws as early as possible. There were 35 games with duration less than 2:30 hours, 31 of which were draws (88.6%, much higher than the draw rate).


There was no change in the opening variants information, still not as detailed as in previous seasons.

There were 8-move book openings in this stage chosen by Cato. 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:
Sicillian - 38 times
English - 20 times
King's Indian - 14 time

The engines had very little freedom to choose the opening variant. In 97.6% of the game pairs the same ECO code was repeated, 92.9% repeated the same opening variant. In all of the game pairs the ECO first letter was repeated twice.

Reverse pairs, wins


Reverse pairs, same moves 


Pairs of reverse games diverged very quickly, 77.4% of the pairs diverged at most after 1 move.  

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