Final draw rate was 42.9%, relatively low.
Game termination
The three most common game termination causes were:
49.1% - TCEC win rule
21.4% - SyzygyTB
17.0% - TCEC draw rule
There were 3 crashes in the division, and two games had to be replayed due to a server connection problem.
Moves per game
Median= 57
Average= 66.5
There were 15 games longer than 100 moves, the longest was 176 moves (Leela - Ethereal, round 24, draw).
Time per game (hours)
Median= 1:10
Average= 1:12
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 - 23 times
Queen's pawn game - 9 times
English, Nimzovich-Larsen attack, Petrov - 8 times
The engines had a lot of freedom to choose the opening variant. However, 48.2% of the game pairs repeated the same ECO code twice, and 32.1% repeated the same opening variant. In 19.6% 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, 82.1% of the pairs diverged at most after 1 move. The longest repeated move sequence in a game pair was 14 plys long, in DeusX-Hannibal, rounds 7 and 14, both draws.
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