Draw rate, wins
Final draw rate was 28.9%. This is higher than in the 4a group but still very low for TCEC.
Game termination
The three most common game termination causes were:
45.6% - TCEC win rule
28.9% - SyzygyTB
11.1% - TCEC draw rule
There were 2 crashes in the stage, as well as one network failure that stopped a game - which was completed later.
Moves per game
Median= 61.3
Average= 67.4
There were 11 games longer than 100 moves, the longest was 188 moves (Monolith - ScorpioNN, game 60, ScorpioNN won).
Time per game (hours)
Median= 1:01
Average= 1:02
Openings
There were 2-move book openings in this stage chosen by Cato. The first letter of the ECO codes was distributed as follows:
The engines had a lot of freedom to choose the opening variant. Only 53.3% of the game pairs repeated the same ECO code twice, and 46.7% repeated the same opening variant. In 8.9% 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, 44.4% diverged immediately out of book, 84.4% of the pairs diverged at most after 1 move. The longest repeated sequence of moves was only 5 plys (chess22k - ScorpioNN, games 39 and 84, King's pawn Colorado counter, two draws ; AllieStein - Gavioya, games 41 and 86, Old Benoni defence, AllieStein won as black)
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