AllieStein continued with another extraordinary RR and it leads the table with a gap of 1.5 points. It scored +3 in RR4 beating all 4 bottom half of the table and losing once to Stockfish. It completed 3 double wins in the last two RRs, more than all the other engines combined so far. Stockfish and Leela both scored +1 and are tied in second place.
Stockfish survived RR4 without a crash, it is still one crash away from disqualification and there are two more RRs to go.
Leela is the only engine without loss so far, yet it has only 5 wins and only 4 against the engines in the bottom half of the table. Leela's win rate is low compared to its rivals, Stockfish and AllieStein have 8 wins so far (not counting AllieStein's "win" through a crash).
A few interesting games
Houdini - AllieStein: Material was equal and evals became negative though Houdini had a central passer. The game reached a QBB vs QBN position, the white king was exposed and AllieStein used this to capture two pawns. After exchanging queens and a few pawns AllieStein started to push a pair of connected passers, the game was adjudicated when they reached the 3rd rank.
Houdini - ScorpioNN: After almost 60 moves ScorpioNN was up a rook for a bishop, then it blundered and gave Houdini a strong attack on the black king. Houdini used the attack to gain material, it reduced to a QN vs QB position with 3 pawns up, the game reached a tablebase win.
AllieStein - KomodoMCTS: AllieStein's eval jumped over 2 early in the game. The engines exchanged pieces until only QRB vs QRB remained and then started to shuffle. After exchanging queens the black pieces had to protect pawns, AllieStein slowly walked its king to the queen side. KomodoMCTS let go of one pawn and AllieStein created an advanced passer and reduced to a rook ending. The game was adjudicated with AllieStein 4 pawns up. AllieStein won this opening from both sides.
Stoofvlees - AllieStein: AllieStein pushed pawns on the king side and (negative) evals started to increase. Both kings were exposed, Stoofvlees tried to attack the black king but AllieStein defended easily. The game reached a RBN vs RBN position with equal material, AllieStein used a mate threat to win material and reduce to a N vs R ending with two advanced passers. The game ended in a winning tablebase position. Another double win for AllieStein.
Komodo - Stockfish: The game reached an unusual R vs BNN ending, Komodo with 2 pawns and Stockfish with none. Stockfish's Eval was close to (negative) 3, but it couldn't find a way to win. The game ended in a draw after a long shuffle.
Stockfish - AllieStein: see featured game below.
Leela - Houdini: Houdini concentrated on the queen side and neglected its king, Leela's eval jumped over 1. Houdini captured a pawn but Leela's king side attack became dangerous. The engines exchanged pieces until only RB vs RN remained, Leela had a pair of connected passers in the center and the black king was almost trapped. It took a while before Leela captured two pawns and the game was adjudicated.
Stoofvlees - ScorpioNN: Stoofvlees pushed its king side pawns forward and left its king exposed. ScorpioNN gave a pawn and attacked, Stoofvlees exchanged pieces as evals increased. ScorpioNN had a chance of reducing to a drawn queen ending, instead Stoofvlees went two pawns up and its king escaped the checks. Stoofvlees pushed a pawn to the 7th rank and the game was adjudicated.
ScorpioNN - AllieStein: ScorpioNN blundered just before all the pieces were exchanged. One bad move with its king led to a king and pawn endgame that was a win for black. AllieStein was able to promote a pawn first, an easy win. A third double win for AllieStein.
Featured game: Stockfish - AllieStein
Premier division, game 102
Link to game on TCEC
There were very few exchanges after the opening. Stockfish gave a pawn and weakened the black pawn line, evals jumped over 1.5. AllieStein had a pawn majority on the king side and both kings were exposed.
AllieStein pushed pawns on the king side and tried to attack the white king. Stockfish got the pawn back and hid its king behind a black pawn on the 2nd rank.
The white king was safe, AllieStein had to worry about its own king surrounded by pieces without pawn support. Stockfish slowly arranged its pieces, it still had to be careful to block back rank attacks. The pressure on the black pieces increased.
AllieStein's defense collapsed and Stockfish soon had the black king in a mating net and the game was adjudicated.
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