After 20 games Stockfish leads 8-3 with 9 draws. Leela won two games and Stockfish won the reverse games twice. Then Stockfish won two game pairs and increased its lead to 5. Leela has no game pair win in the first 10 pairs.
Games 11-12 started with a sideline of the French Tarrasch, closed variation. In game 11 the center was blocked and the engines opened the c file. The engines shuffled and all pieces were on the board until move 30, Leela's eval slowly increased. In a series of exchanges of minor pieces Leela captured a pawn and created a passer on the queen side. The engines exchanged a pair of rooks, then continued to shuffle and Leela's eval drifted back to around 1. After move 50 Leela's eval increased again, it pushed the g pawn forward.
The black queen was stuck on the king side, Leela exchanged pawns on the queen side and opened the b file. Stockfish regained the pawn and created a passer in the center while Leela moved its queen forward. The engines exchanged pieces and reduced to a BN vs BN position, Leela created a second passer.
Leela exchanged minor pieces, Stockfish captured one passer but the white king moved forward on the king side and created more passers there. Leela queened one and mated.
In game 12 the engines repeated the reverse game for 23 plys with a transposition, the center was blocked and the c file was open. Stockfish pushed pawns on the king side and evals started to increase. Leela gave a pawn on the queen side, then a series of exchanges opened the board and gave Stockfish a passer in the center. Stockfish captured another pawn and created doubled passers on the queen side, Leela captured one of these passers. The black queen moved forward on the king side, Stockfish moved a rook forward on the queen side.
The white king was exposed and Stockfish had to be careful. After exchanging a pair of rooks the white queen moved forward. Stockfish abandoned its knight, it captured the black rook while Leela captured 3 white pawns.
Stockfish saw the win in its PV, it gave checks and pushed the passers forward, careful to avoid perpetual check on the other side. Eventually Stockfish exchanged queens, queened the passer and mated. There were two white wins in this game pair, Stockfish leads 5-2.
Games 13-14 started with a rare sideline of the Wade defense. In game 13 there was on minor piece exchange after the start. The engines slowly formed pawn lines without exchanges, Leela moved its king to the king side without castling, evals stayed mostly stable around 1. After move 26 there was a series of exchanges, the engines opened the board and reduced to a QRN vs QRN position.
Leela moved a rook forward on the queen side, captured a pawn and created a passer. In a long PV agreement Stockfish moved a rook forward behind the white passer, strangely Stockfish's eval increased while Leela' eval drifted down. Stockfish moved the queen forward as well and captured the white passer, then it gave a rook for a knight and pawn and created a passer. Leela exchanged queens and cleared all the queen side pawns.
Stockfish saw the loss but it took 15 moves for Leela's eval to show a win. Stockfish gave a pawn and couldn't stop the white king advancing forward. Leela captured the remaining black pawns, it kept one last pawn, queened and mated.
In game 14 Stockfish moved its king without castling and Leela kept its king in the center. Stockfish's eval started to increase early, there was a pawn trade on the queen side, then the engines opened the g file. After a bishop exchange Stockfish captured a pawn and created a passer on the king side. It gave a knight and pushed the passer to the 7th rank, supported by two rooks. The white queen moved forward, in a series of exchanges Leela captured the passer and lost material, the game reached a Q vs RN position.
Leela tried to hold the center, the white king slowly moved forward on the queen side. Eventually Stockfish cleared the black pawns on the queen side and created a passer. It gave the queen for a rook to queen the passer, mate followed. There were two white wins in this game pair, Stockfish leads 6-3.
Games 15-16 started with a rare sideline of the Indian defense, London system. In game 15 the engines exchanged most minor pieces in the center, Leela kept its king uncastled in the center. Stockfish pushed pawns on the queen side while Leela walked its king to the king side and freed the king side rook. The engines opened the d file and exchanged a pair of rooks, the exchanges continued and the game reached a queen ending. Leela was a pawn up, Stockfish's eval was at 0 but Leela continued to shuffle and trade pawns. The game was adjudicated on move 138 after Leela lowered its eval.
In game 16 Leela pushed pawns on the queen side, Stockfish kept its king in the center. After a few minor piece exchanges in the center Stockfish captured a pawn, then the engines reduced to a QRN vs QRB position. In a long PV agreement Stockfish created a passer on the queen side and captured another pawn. Both queens moved forward, Stockfish captured a third pawn but Leela regained two pawns before reducing to a queen ending on move 47.
Evals remained more or less stable for a long time, it seemed Stockfish was looking for the right sequence of moves. The white king moved all the way to the back rank, with the black queen chasing. Then the white king walked to support the passer, Stockfish gave a pawn and managed to push its passer forward after 40 moves. The passer was on the 7th rank and still Leela's eval was below 1. Leela's eval finally reacted, on move 122 it lost the queen for the passer and mate followed. Stockfish wins the game pair, it leads 7-3.
Games 17-18 started with a rare sideline of the Blumenfeld countergambit, white was a pawn up. In game 17 the engines opened the queen side and Leela created a passer there. The engines stablized their pawn lines and exchanged minor pieces, on move 42 the queens were exchanged and the engines started to shuffle. Evals slowly drifted down, Leela moved a pawn on move 54 and then on move 94. On move 130 the engines started to exchange pawns and pieces opening the board. Stockfish regained the pawn and evals were close to 0, the game was adjudicated on move 157 when enough pieces have been exchanged.
In game 18 the queen side stayed closed, Leela pushed the c pawn forward and Stockfish's eval increased. Leela gave two knights and attacked the white king. In a long PV agreement Leela captured a rook and a pawn, creating connected passers in the center.
The black passers looked dangerous but both evals were high. Leela exposed the white king, Stockfish captured one of the passers after exchanging a pair of rooks. Stockfish exposed the black king and captured the second black passer, then chased the black king. Leela lost material and was mated. Stockfish wins the game pair, it leads 8-3.
Games 19-20 started with a rare sideline of the Italian two knights defense, Traxler counterattack. White was a pawn up but its queen side was undeveloped, Black moved its king without castling. In game 19 there was a long PV agreement after the start, Leela developed its pieces and the engines exchanged minor pieces and queens. Evals started to decrease, the game reached a RRN vs RRB position and the engines started to shuffle. The engines exchanged minors and a few pawns, the game was adjudicated when evals were low enough. In game 20 the engines exchanged bishops and opened the f file. After some shuffling the engines opened the queen side. On move 51 a pair of rooks was exchanged, on move 67 there was a pawn exchange, on move 98 the game reached a QRN vs QRB position. Evals were close to 0, Leela gave the bishop and a pawn and threatened mate on the back rank, Stockfish secured a draw with perpetual check.
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