After 40 games Stockfish leads 16-8 with 16 draws. There were 4 drawn game pairs in the last 5, one double draw and 3 double white wins. Stockfish managed one game pair win and it extended its lead to +8. Leela still has only one game pair win after 20 pairs.
Games 31-32 started with a rare sideline of the Bird opening. In game 31 the engines blocked the center, Leela pushed pawns on the king side and both engines castled long. Leela placed a bishop on d6, then exchanged it for a knight, a pawn exchange opened the g file. Stockfish tried to attack the white king but was not effective. Leela doubled rooks on the g file, captured a pawn and created a passer.
Stockfish tried to block the white passer, Leela moved a rook to g7 and offered it for a bishop but Stockfish refuse because that would connect a second passer. Instead Leela gave a knight for a pawn to create connected passers. Stockfish tried to give a bishop for one of the passers, eventually Leela captured the bishop and kept the passers, though they became doubled.
In a QRN vs QRN position Leela captured another pawn and queened a passer, then it sacrificed a queen and mated with the other.
In game 32 Stockfish gave a pawn before blocking the center, both engines kept their kings in the center uncastled. The engines exchanged minor pieces and Leela captured a second pawn, evals remained low. Stockfish doubled queen and rook on the f file and threatened the black king, then it captured a pawn creating a passer in the center and forcing Leela to move its king, trapping the king side rook. Evals started to increase, Leela created a passer on the king side. Stockfish traded its passer for a pawn on the king side, then the game reached a RRN vs RRN position.
Leela was a pawn up but Stockfish had a rook on the 7th rank. The engines traded pawns, then exchanged a pair of rooks and Stockfish captured the black passer. After some shuffling Stockfish managed to capture another pawn and created two passers on the queen side.
Stockfish pushed a passer forward, it wanted to exchange knights but Leela gave its knight for free to avoid a 7-man position. This was only a small delay, Stockfish queened and mated. There were two white wins in this game pair, Stockfish leads 13-6.
Games 33-34 started with a sideline of the Caro-Kann defense, two knights attack. In game 33 there were no exchanges after the start, Leela pushed a pawn on the queen side all the way to a6. There was a minor piece exchange followed by some shuffling, evals drifted down. Another minor piece exchange opened the d file, the engines exchanged all rooks and reduced to a QB vs QB position. The engines traded pawns and created passers, but evals were low enough for adjudication.
In game 34 both queens moved forward early and after a minor piece exchange Leela grabbed a pawn in the center. The d file opened and the black king was in the center. In a long PV agreement most pieces were exchanged and the game reached a Q vs RB position with black a pawn up on move 27. Stockfish's eval was low, but after it created a passer on the king side its eval started to jump. Leela's eval dropped below 1.
Stockfish slowly pushed the passer while the black pieces threatened its king. Leela managed to capture the passer but the white queen got behind the black pawns. Stockfish equalized the number of pawns, it still had to work hard with its queen to be able to capture another pawn and create a passer. Leela's eval slowly increased but was still around 1.
Stockfish was very patient, the white king moved forward before Stockfish tried to push the passer. It took nearly 50 moves to force a pawn exchange and create a second passer, Leela captured one but was then mated. Stockfish wins the game pair, it leads 14-6.
Games 35-36 started with a line in the Bogo-Indian, Gruenfeld variation played in high level human chess. There were no exchanges and the center was blocked. In game 35 there was a pawn exchange on the queen side. The engines moved their major pieces to the queen side and shuffled for a while with evals stable. There were a few minor piece exchanges and evals increased a little. Then all the major pieces were exchanged and the game reached a BB vs BN position with white a pawn up.
Stockfish's eval increased faster than Leela's. The engines exchanged a few pawns, Leela captured a second pawn and created a passer. There was another pawn trade in the center and Leela added two more passers.
Leela pushed its passers forward, Stockfish lost material, Leela queened and mated.
In game 36 there were no exchanges after the start, Stockfish kept its king uncastled. Evals remained stable as the engines mostly shuffled behind their pawn lines, the white king walked to the queen side. Stockfish thought that Leela's move 35 was a mistake, its eval jumped and Leela's eval jumped immediately too. Stockfish exchanged a pair of pawns and created a small opening on the king side.
Leela moved the bishop to d4, Stockfish pushed the e pawn forward and captured on d6, creating a doubled passer. The engines started to exchange pieces and pawns, Leela captured a passer but lost a rook for a bishop. Leela managed to captured the second passer, Stockfish gave back the material and captured a knight. The game reached a QN vs Q position, Stockfish saw the win in its PV.
Stockfish pushed the b pawn forward and Leela couldn't stop it. After exchanging queens Stockfish queened and mated. There were two white wins in this game pair, Stockfish leads 15-7.
Games 37-38 started with a rare sideline in the KID Petrosian variation. In game 37 the engines exchanged a pair of pawns that opened the c file and blocked the center. Leela pushed pawns on the king side and kept its king in the center. Evals came down as the engines exchanged minor pieces and queens. The engines traded pawns and kept exchanging pieces until only RN vs RN were left, and the game was adjudicated. In game 38 the c file stayed closed, the engines blocked the center and most of the king side, Leela completed the king side pawn line with a bishop. The engines shuffled and Stockfish castled long, evals dropped to 0. After exchanging a pair of bishops Stockfish attacked the king side while Leela captured pawns on the queen side. The engines exchanged pieces until only QN vs QR remained and the game was adjudicated.
Games 39-40 started with a rare sideline of the Kangaroo defense. In game 39 after exchanging a pair of knights Leela castled long. Stockfish opened the c file and evals slowly increased. Leela blocked the center, Stockfish pushed pawns on the king side and exchanged a pair. Leela moved a rook forward, the engines exchanged all minor pieces and Leela captured a pawn.
Leela moved its king forward on the queen side, the engines exchanged queens and Leela pushed the e pawn forward to the 7th rank. Leela exchanged a pair of rooks and captured almost all the black pawns, it then queened a passer and mated.
In game 40 Stockfish castled long as in the reverse. There was one pawn exchange in the center but files remained closed, evals increased steadily. Leela moved a pawn to b3 after a minor piece exchange, Stockfish doubled rooks on the d file and prepared a pawn advance.
Leela captured a pawn while Stockfish pushed the d pawn and it became a passer on d6. After some shuffling the engines exchanged queens, Stockfish gave a rook for a bishop and then won back a rook for the passer. The game reached a RN vs R position and each engine had a passer.
Both engines queened a passer, Leela was first and it gave a few checks and captured a pawn. Then Stockfish attacked and the queen and knight were very effective together. Stockfish captured the black queen and mated. There were two white wins in this game pair, Stockfish leads 16-8.
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