Season 13 division 2 statistics

Draw rate, wins



Final draw rate was 64.3%.


Game termination

The three most common game termination causes were:
29.5% - TCEC draw rule
28.6% - TCEC win rule
22.3% - SyzygyTB

There were 3 crashes in the division.

Moves per game



Median= 61.3
Average= 66.0

There were 12 games longer than 100 moves, the longest was 173 moves (ChessBrain - Ethereal, round 27, draw). 

Time per game (hours)



Median= 1:12
Average= 1:11

Openings

There were 2-move book openings in this stage chosen by Cato. Each opening was repeated 4 times in a round, and then again in the reverse games round. In total 14 2-move openings were used. 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 - 20 times
Queen's pawn game - 19 times
Philidor - 9 times

The engines had a lot of freedom to choose the opening variant. However, 51.8% of the game pairs repeated the same ECO code twice, and 42.9% repeated the same opening variant. In 16.1% of the game pairs the ECO first letter was not repeated twice.

Reverse pairs, wins



Reverse pairs, same moves 



Pairs of reverse games diverged very quickly, 80.3% of the pairs diverged at most after 1 move. The longest repeated move sequence in a game pair was only 7 plys long.