Draw rate, wins
Final draw rate was 71.4%.
Game termination
The three most common game termination causes were:
33.3% - SyzygyTB
24.4% - TCEC draw rule
17.9% - 3-Fold repetition
There were 2 crashes in the stage, both by Stockfish.
Moves per game
Median= 73.5
Average= 83.5
The games are longer when NN engines are involved, due to different scoring methods that delay the application of the win and draw rules. There were 39 games longer than 100 moves, the longest was 222 moves (Leela - Houdini, game 47, draw).
Time per game (hours)
Median= 3:06
Average= 2:57
Openings
There were 8-move book openings in this stage chosen by Cato. The first letter of the ECO codes was distributed as follows:
The engines had almost no freedom to choose the opening variant, 96.4% of the game pairs repeated the same ECO code and opening variant twice. In all of the game pairs the ECO first letter was repeated twice.
Reverse pairs, wins
The 2 "biased" openings involved Stockfish crashes - Stockfish won a game and crashed in the reverse. Not really biased openings...
Reverse pairs, same moves
Pairs of reverse games diverged very quickly, 47.6% diverged immediately out of book, 73.8% of the pairs diverged at most after 1 move. The longest repeated sequence of moves was 14 plys (Houdini - Leela games 75 and 103, Sicilian Scheveningen variation, Leela won in white)
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