There are three engines without loss and a positive score, Stockfish with 7/28 wins, AllieStein with 4/18 and Leela with 2/18. At this rate we will see a replay of last season's superfinal between Stockfish and AllieStein. Leela's win rate is disappointing, it drew all 12 games against CPU engines so far. Stockfish's result agains GPU engines isn't great as well, so far one win in 8 games. AllieStein has a good chance of winning the premier division.
ScorpioNN is likely to finish last, it has a score of -4 after 18 games, compared to Houdini with -4 in 28 games. KomodoMCTS will probably be the 3rd engine to relegate. One of the 4 engines with scores close to even - Komodo, Fire, Ethereal, Stoofvlees will be the 4th to relegate.
There were 10 decisive games in the 30 reverse games, compared to 3 in the first 30 GPU games.
Interesting games
Game 92, Stoofvlees - Komodo: There were no exchanges after the opening except one pair of pawns. Stoofvlees had a space advantage, its eval was around 1 and it started to increase after move 25, though the engines seemed to be shuffling. Gradually the black pieces were pushed back and struggled to find moves. After exchanging knights Stoofvlees put its remaining knight on c6, its eval over 3. After the king side was locked Komodo gave a rook to get rid of the white knight, Stoofvlees slowly prepared its queen side attack. When it was ready Stoofvlees opened files on the queen side and exchanged down to a RB vs BN position. Stoofvlees captured a pawn and the game was adjudicated before it captured more.
Game 94, AllieStein - Fire: See featured game below.
Game 95, Ethereal - ScorpioNN: Ethereal had a small eval advantage after the opening, its eval jumped over 2 after a ScorpioNN blunder. A series of exchanges led to a QBN vs QR position, the exposed black king gave Ethereal a significant advantage. Ethereal sacrificed its bishop but had the black king in a mating net. ScorpioNN soon lost its queen and then was mated.
Game 96, KomodoMCTS - AllieStein: KomodoMCTS forced a stalemate draw with a queen sacrifice. AllieStein's eval went crazy for a few moves before the end.
Game 99, ScorpioNN - Komodo: Another ScorpioNN blunder. This time it thought it could capture a pawn, noticing a move later that Komodo loses its queen temporarily but can immediately trap the white queen. This led to a R vs BN imbalance, the black bishops and knights were very strong. Eventually Komodo captured a knight and the game was over not long after with another mate.
Game 102, AllieStein - Ethereal: AllieStein's eval increased after the opening, reaching about 2.5. All pawns were on the board, there were several exchanges of minor pieces and the engines shuffled for a while. Ethereal captured a hanging pawn while AllieStein pushed pawns forward on the king side and created an advanced passer. Evals started to increase again after the position opened a little and only major pieces remained. AllieStein attacked the black king, Ethereal exchanged queens to stop the attack. The white king came forward, Ethereal had to keep an eye on the white passer and this let AllieStein capture more pawns. The game was adjudicated in a double rook ending with white two pawns up.
Game 107, Stoofvlees - Ethereal: Stoofvlees gave two pawns early, the black pawn line had holes on both sides and the black king stayed in the center without castling. After a series of exchanges Ethereal was down a knight and up 3 pawns, the game reached a RBN vs RB position with evals over 2. Stoofvlees captured a pawn and created a king side passer. After exchanging knight for bishop the black rook moved forward and captured another pawn, the game was adjudicated a few moves later.
Game 109, Leela - ScorpioNN: Both engines did not castle kings, and moved their pieces behind the pawn lines. Leela's eval was around 1.5 for a long time as the engines shuffled, evals came down as the 50-move draw approached. Just before the draw ScorpioNN grabbed a pawn, the engines reduced to a RN vs RB position and evals went up again. Leela had two advancing passers and ScorpioNN gave the bishop to stop them. After exchanging rooks the white knight was on time to stop the black pawns and the white king captured a pawn to create a winning passer.
Game 110, AllieStein - Stoofvlees: AlllieStein started the game with an eval over 1, and its eval increased very fast to over 10 by move 23. It developed its pieces rapidly, after opening the king side the black king was in danger. The engines reduced to a QR vs QR position, material was equal but the exposed black king was a big advantage for AllieStein. Stoofvlees escaped being mated but it lost the rook and the game was adjudicated.
Game 117, ScorpioNN - KomodoMCTS: ScorpioNN had a space advantage after the opening, its eval increased quickly. The engines opened the queen side and exchanged queens, then started to shuffle. ScorpioNN waited for the right moment to open the king side and capture a rook for a bishop. The engines shuffled again in a RRB vs RBN position, ScorpioNN had an advanced passer that KomodoMCTS blocked with its bishop. The engines exchanged rooks, it seemed that ScorpioNN was not in a hurry to win but eventually the material advantage was enough. The game was adjudicated when KomodoMCTS had no pawns and ScorpioNN had two advanced passers. There were two white wins in this opening, too biased perhaps.
Game 120, Stockfish - Stoofvlees: Stockfish gave a pawn early and created a gap in the pawn lines on the queen side. All pieces were on the board until move 23, and evals were close to 0. Stoofvlees pushed a pawn on the king side all the way to f3, then offered a rook and threatened to expose the white king. Stockfish waited until it thought it was safe to take the rook, evals stayed low even though the black queen was facing the white king. Then Stockfish's eval jumped over 4 suddenly, Stoofvlees thought it had at least a perpetual check draw for 4 additional moves before it realised Stockfish can escape. The black attack was over after a few piece exchanges and the material advantage became decisive. The game was adjudicated with mate a few moves away.
Featured game: AllieStein - Fire
Premier division, game 94
Link to game on TCEC
There were many exchanges after the opening, clearing the center. Fire went a pawn up yet AllieStein's eval was over 1. Fire's queen side was not developed, its bishop almost trapped. The black king was vulnerable especially on the dark squares.
AllieStein gave a second pawn to put a bishop on the long diagonal threatening the black king, its eval jumped high. Fire's eval slowly reacted, it gave a rook to remove the bishop and the game reached a R vs N position, black a pawn up. AllieStein's eval was already way over 10.
AllieStein pushed its pawns forward, but then it started to shuffle without purpose. After 30 moves it finally captured a pawn and created a passer on the king side.
The game was adjudicated a few moves later.
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