Draw rate, wins
Final draw rate was 50%.
Game termination
The three most common game termination causes were:
30.8% - TCEC win rule
29.2% - SyzygyTB
25.8% - TCEC draw rule
There were 3 crashes in the stage: RubiChess once and chess22k twice. There were 8 games that ended in mate, the evals of ScorpioNN and Stoofvlees were usually not high enough to invoke the win rule.
Moves per game
Median= 63.5
Average= 69.4
There were 27 games longer than 100 moves, the longest was 197 moves (Fritz - Gull, game 46, draw).
Time per game (hours)
Median= 1:03
Average= 1:02
Openings
There were 4-move book openings in this stage chosen by Cato. The first letter of the ECO codes was distributed as follows:
The engines had less freedom to choose the opening variant, 81.7% of the game pairs repeated the same ECO code twice, and 78.3% repeated the same opening variant. In 4.2% 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, 33.3% diverged immediately out of book, 80.8% of the pairs diverged at most after 1 move. The longest repeated sequence of moves was 17 plys (Wasp - Nirvana games 119 and 239, QGA Bogolyubov variation with 4 queens on the board, Wasp won in black)
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