Season 21 league 4 statistics

A summary statistics table of previous stages and seasons. 

Draw rate, wins

Final draw rate was 51.5%.

Game termination

The three most common game termination causes were:

39.4% - SyzygyTB
26.5% - TCEC draw rule
22.2% - Mate

There was one crash in the stage by Koivisto, and ChessFighter lost 3 games on time.

Moves per game

Median= 64.25
Average= 71.1

There were 16 games longer than 100 moves, the longest was 208 moves (ChessFighter - Monolith, game 14, ChessFighter lost on time).

Time per game (hours) 

Median= 1:06
Average= 1:05

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 56.1% of the game pairs repeated the same ECO code twice, and 47.0% repeated the same opening variant. However, only in 12.1% 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, 36.4% diverged immediately out of book, 81.8% of the pairs diverged at most after 1 move. The longest repeated sequence of moves was 15 plys (Drofa - Nirvana, games 43 and 109, Ruy Lopez Berlin defence, Cordel variation, two white wins)