Draw rate, wins
Final draw rate was 66.7%.
Game termination
The three most common game termination causes were:
38.3% - SyzygyTB
23.3% - TCEC draw rule
13.3% - TCEC win rule
There was 1 crash in the stage, but that was due to a wrong parameter setting for ScorpioNN. The game was resumed after the parameter was fixed. There were 8 games with mate on the board, mostly ChessFighterNN losses.
Moves per game
Median= 72.5
Average= 74.8
These are NN-related numbers, significantly higher than in AB engine games.
There were 9 games longer than 100 moves, the longest was 148 moves (ScorpioNN - Fire, game 27, draw).
Time per game (hours)
Median= 2:01
Average= 1:56
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, all of the game pairs repeated the same ECO code and the same opening variant twice.
Reverse pairs, wins
Reverse pairs, same moves
Pairs of reverse games diverged very quickly, 43.3% diverged immediately out of book, 83.3% of the pairs diverged at most after 1 move. The longest repeated sequence of moves was 10 plys (Ethereal - Fire games 36 and 51, Nimzo-Indian classical variation, two draws).
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