Draw rate, wins
Final draw rate was 65.6%. There was a preference for white in the decisive games, 4 times more than black wins.
The three most common game termination causes were:
39.3% - TCEC draw rule
30.8% - TCEC win rule
19.2% - TB position
was one crash by Jonny, a bit disappointing for such a late stage. This was mentioned as a possibility in the stage 2 statistics report. At least it didn't affect the qualification outcome.
Moves per game
The distribution is similar to the one in stage 2.
Time per game (hours)
Games were longer than in stage 2 by about an hour, due to the longer time control - 30 minutes more per engine. I'm not sure what causes the double peak.
There were 8-move book openings in this stage chosen by Cato, so the
engines had almost no say. 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 - 51 times
English - 22 times
Dutch - 20 times
8 predetermined moves usually made sure that the reverse pair games had
the same opening definition. There were 6 cases where the full opening
name was different, of these 5 had different ECO codes.
Reverse pairs, wins
Only 4/112 openings are suspect of a bias - each engine wins once,
while 53/112 openings have a win+draw combination - a proof of engine
strength, winning from one side and holding the other side. Cato's opening choices manage to keep the draw rate down with opening bias while letting strong engines find defenses the weaker engines struggle with.
Reverse pairs, same moves