In a tense final game, Stockfish came close to winning, but missed the winning line. Because Komodo had superior tiebreakers to Leela, this meant Komodo would qualify for the superfinal unless Leela managed to hold Stockfish to a draw with Black in the last game of the division. Meanwhile, Komodo kept the division interesting by winning two of its last three games. With three games left, Leela missed a win against Andscacs, which would've more or less secured her a place in the superfinal. By TCEC rules this meant Komodo MCTS was disqualified and all its scores were zeroed out, which put Leela back in second place. This led to Komodo regaining second place, only for Komodo MCTS to crash yet again. Halfway through the division the race was upended again when Leela went through a bad streak, losing three games in a row to Stockfish, Komodo, and Fire. However, when both Komodo and Houdini failed to score more wins against the lower half of the field, Leela was able to take the lead. Houdini took the early lead, but Komodo gained second after winning two games by forfeit when its sibling Komodo MCTS crashed. Second place however was a hotly-contested affair, with Leela, Komodo and Houdini neck-and-neck for most of the division. Right from the start it became clear that Stockfish was in a league of its own, and it dominated the division, scoring wins against every other engine without losing a game. This was the strongest premier division ever, with multiple-time champions Stockfish, Komodo, and Houdini in the mix. Leela defended well and drew, qualifying for the superfinal. g5, which was still tricky but not decisive. Black is clearly under pressure, and as later analysis showed, 22. The penultimate game for this division set a new TCEC moves record for a decisive game: 308 moves before Leela defeated Fritz. At the other end of the table, former champions Jonny and Fritz, which had not been updated, found themselves outclassed and finished second-last and last respectively however with fellow competitor Ginkgo crashing five times (and therefore being disqualified), Jonny managed to stay in the division.
Komodo MCTS, which had yet to lose a game in the lower divisions except to Leela, also conceded its first loss to third-place Fizbo. However, Leela dropped a game against fourth-place finisher Chiron. This was also a TCEC points record for this division. In a demonstration of how much it had improved, Leela scored 20/28 in this division, the same score it had achieved in Division 2. Leela and Komodo MCTS's rampage through the lower divisions continued, and they again finished first and second. Fellow new entrant Scorpio NN performed badly and finished last, drawing only one game and losing the rest. New entrant Komodo MCTS dominated Division 4, winning by a clear four points, although it did lose a game to second-place finisher rofChade. Aside from this change, the season used the standard rules of the TCEC.
This change meant DeusX did not meet the uniqueness criteria and therefore did not participate.
#Houdini 16.5 no promote parameter code
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