Final draw rate was 47.3%. If we ignore the crashed games the draw rate was 52%.
Game termination
The three most common game termination causes were:
40.2% - TCEC win rule
26.8% - TCEC draw rule
14.3% - SyzygyTB
There were 10 games that ended in a crash.
Moves per game
Median= 59.3
Average= 64.9
There were two games that ended in crashes in under 20 moves, and there were 12 games with more than 100 moves.
Time per game (hours)
Median= 1:10
Average= 1:11
Openings
The openings information was fixed in division 2, and the openings section of the report returns. It should be noted that previously the opening variants were much more detailed than in the current version, I don't know if this is still under development.
There were 2-move book openings in this stage chosen by Cato. The first letter of the ECO codes was distributed as follows:
For each double round all eight games had the same book sequence (reverse games are played consecutively). There were 14 book sequences, each repeated 8 times. For some sequences all the openings had similar codes (e.g. Sicillian, Hungarian variation, or Scandinavian defense). In others the engines had more freedom to choose.
If we use the opening 'family name' (using format FAMILY_NAME: VARIANT....) the top 3 are:
QGD - 18 times
Sicillian - 16 times
Alekhine's defence, Caro-Kann, English, Scandinavian defence, Vienna game - 8 times each
The engines had a lot of freedom to choose the opening variant. Only 50% of the game pairs repeated the same ECO code twice, and 48.2% repeated the same opening variant, the high percentage is related to the lack of detail in opening variants. In 7.1% 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, 69.6% of the pairs diverged at most after 1 move. One game pair repeated 5.5 moves after book (Arasan - Hannibal, games 53 and 54, Caro-Kann, Tartakower (Nimzovich) variation).
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