After 30 games Stockfish leads 7-3 with 20 draws. Stockfish won another game pair and extended its lead to 4. There was only one decisive game in the last 10, after 9 decisive games in the first 20. According to the bookmakers description from game 21 onward the book bias should slowly increase.
In game 21 the engines pushed pawns on the king side and later castled long. There were a few minor piece exchanges and the king side opened, evals came down slowly. Leela went up a pawn and the game reached a QRN vs QRN position, evals were low enough for adjudication. In game 22 Stockfish did not push pawns on the king side, instead it castled long, opened the center and went a pawn up. Leela gave a second pawn and opened the queen side, then castled short. Evals came down, the material advantage for white was offset by the threat on the white king. The engines exchanged pieces until only BN vs BB were left, and the game was adjudicated.
Games 23-24 started with a 15-ply book, a sideline of the Sicilian Scheveningen variation with high exit evals. In game 23 evals remained high as the engines played out a PV agreement, Stockfish castled short and the queens were exchanged. Stockfish had two isolated pawns on the queen side to protect. On move 26 the pawns stopped moving and the engines started to shuffle. After exchanging bishops the game reached a RRN vs RRN position, Leela's eval slowly decreased while Stockfish's eval dropped to 0. The engines exchanged knights, there were too many pawns for the draw rule and the game ended in repetition on move 77.
In game 24 Leela pushed pawns on the queen side, a pawn exchange opened the a file and Leela had only one isolated pawn left. Stockfish then pushed pawns on the king side, Leela castled short anyway and evals stayed high.
Stockfish moved its king back to the center to avoid attacks from the open file, then pushed a pawn to g6. Leela did not exchange pawns, it moved the king to the corner. Evals increased rapidly as Stockfish prepared an attack on the black king, it gave a rook for a knight and pawn to remove a defender.
A series of exchanges stopped the attack, Stockfish managed to get a pawn to the 7th rank and Leela gave a bishop to stop it. The game reached a knight vs pawns ending.
Stockfish captured a few pawns, queened a pawn and mated. Stockfish wins the game pair, it leads 7-3.
Games 25-26 started with a 16-ply book, a sideline of the KID Saemisch variation. In game 25 Leela castled long and Stockfish pushed pawns on the queen side. Pawn exchanges opened the queen side and the engines exchanged queens. Evals came down as the engines continued to exchange pieces, the game reached a king and pawns ending on move 31. Leela was a pawn up but evals were low and the game ended by the draw rule. PV suggested that both engines could queen a pawn, leading to a drawn queen ending. In game 26 Stockfish castled long, the engines opened a file on the queen side but pieces stayed longer on the board. Stockfish opened a file on the king side and created a passer, but its attack on the black king was weak. Evals came down and the engines exchanged pieces until only QNN vs QBN remained, the game was adjudicated a few moves later.
Games 27-28 started with the St. George defence. In game 27 Stockfish pushed pawns on the queen side, the engines opened a file and exchanged a pair of rooks. Evals came down and the engines exchanged pieces, most of the queen side pawns were gone and Leela went a pawn up. After a period of mostly shuffling the engines exchanged the remaining rooks and the game was adjudicated. In game 28 again a file was opened on the queen side and the engines exchanged a pair of rooks, evals were high a little longer. Stockfish went up a pawn and created a passer on the queen side. Leela's pieces were more active and evals came slowly down. Stockfish pushed the passer forward, Leela gave a rook for a knight and threatened the white king in a QRB vs QBB position. Stockfish lost its passer and the game was adjudicated.
Games 29-30 started with a 3-ply book 1. e4 Nc6 2. b4 with a black bias. In game 29 Stockfish captured the b pawn, Leela used the time to push pawns in the center. The engines exchanged minor pieces and evals came down. Stockfish pushed pawns on the queen side where it had a pawn majority, in a QRR vs QRR position it gave a pawn to create a passer on the 3rd rank. Leela had perpetual check threats, Stockfish exchanged queens to avoid this and it lost its passer. The game as adjudicated a few moves later. In game 30 Leela captured the b pawn, this time the engines opened a file in the center. Evals came slowly down while the engines developed pieces without exchanges. After some exchanges, Leela created a passer on the queen side. Evals were close to 0 and the game reached a RBN vs RBN position. Stockfish created a passer and the engines exchanged knights before the game was adjudicated.
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