In the CPU-CPU matches, defending champion Stockfish steamrolled its rivals. It defeated Houdini and Ethereal twice, scoring six wins in the process, one more than the rest of the division combined. Houdini, which had not been updated for over two years, was further handicapped by only being able to make use of 64 of the 176 available threads, and was last after the double round robin. Komodo MCTS was the only engine not to lose to Stockfish, but it also failed to score any wins. Fellow promoted engine Fire performed surprisingly well, scoring two wins while losing only to Stockfish. Combined with its run through the lower divisions as well as in Season 16, it set a new TCEC record of 124 games without losing.
