After 70 games Stockfish leads 23-12 with 35 draws. Stockfish won two game pairs and its lead is 11 wins. Leela hasn't won a game pair in the last 16 pairs, and there are only 15 pairs left in the match.
Games 61-62 started with a sideline in the Queen's gambit accepted, central variation. Black was up a pawn with a passer in the center. In game 61 Leela exchanged both its bishops for knights causing two black doubled pawns. Leela captured the black passer, both queens moved forward and then were exchanged. The game reached a RN vs RB position, Stockfish's eval came down while Leela remained stable. The engines shuffled for a long with a few pawn moves, after move 88 the started to exchange pawns and pieces and Leela's eval came down enough for adjudication. In game 62 Stockfish exchanged minor pieces and captured the passer. After more exchanges the game reached a QRN vs QRB position on move 18. Evals came down, another series of exchanges reduced to a rook ending with white a pawn up. Evals were low enough for the draw rule and the game was adjudicated.
Games 63-64 started with a rare sideline in the French Tarrasch, pawn center variation. The center was locked, all pieces and pawns were on the board. In game 63 Leela pushed pawns on the king side and castled short, Stockfish pushed pawns on the queen side and opened the b file. The engines exchanged a pair of rooks and Stockfish castled short as well. Evals were stable as the engines mostly shuffled, for a few moves Leela's eval increased above 1.5. Stockfish captured a pawn and created a passer on the queen side, Leela's eval came back down. Leela opened the king side, Stockfish gave a knight for two pawns and exchanged queens.
The engines shuffled again for a while with stable evals, Leela moved a rook to the 7th rank. On move 52 the engines traded minor pieces, evals started to increase. Stockfish pushed a passer to h3, then gave a rook for a bishop and reduced to a RNN vs BB position with black 3 pawns up.
Stockfish pushed a second passer to a3, Leela blocked with a knight, then exchanged the other knight for a bishop. Stockfish captured a pawn on the king side and pushed its passers there to g3 and h2 but there the white king blocked them. Leela gradually captured pawns and the game ended in a tablebase win.
In game 64 again Stockfish pushed pawns on the king side and Leela pushed pawns on the queen side, the piece moves were a little different and evals increased early. Stockfish castled short and the engines exchanged a pair of rooks. The black queen moved forward on the b file, Leela captured a pawn and created an advanced passer. Stockfish pushed the f pawn, Leela gave a knight for the pawn to keep the king side closed.
Stockfish moved major pieces to the a file and Leela castled its king. Leela lost the passer and traded queen for a rook and knight. Leela captured a pawn and created another passer on the queen side, it tried to block the opening in the pawn wall with its remaining pieces. On move 45 the engines exchanged a pair of bishops and the game reached a QNN vs RBN position.
Leela couldn't hold the block on the queen side, after a series of exchanges the engines reduced to a knight vs pawns endgame. The white king moved forward and captured pawns, Stockfish queened a passer and mated. There were two white wins in this pair, Stockfish leads 21-12.
Games 65-66 started with a 22-ply sideline in the Nimzo-Indian defense, Saemisch variation. The engines castled in opposite directions, all pawns were on the board and there was one minor piece exchange. In game 65 the engines played behind their pawn lines and blocked the queen side. There was a pawn exchange in the center and another on the king side, Leela gave a pawn and opened the e file. Stockfish's eval came down, the major pieces moved to the king side and a minor piece exchange opened the f file. The engines exchanged queens and Leela's eval came down as well. The exchanges continued and the game was adjudicated on move 45. In game 66 Stockfish thought for 45 minutes on its second move. The engines blocked the queen side and exchanged minor pieces on the king side. Leela captured a pawn on the queen side and created a passer, Stockfish locked the center and exchanged bishops. Stockfish regained the pawn, it avoided a queen exchange for a few moves but then agreed. In a RRN vs RRN position the engines started to shuffle, Stockfish's eval came down while Leela's eval was not low enough for the draw rule. The engines exchanged knights, the game was adjudicated on move 99.
Games 67-68 started with a sideline in the Ruy Lopez exchange, Bronstein variation. The engines castled in opposite directions, all pawns were on the board and there was one minor piece exchange. In game 67 Stockfish thought for 45 minutes on its first move, which was not what Leela expected. There was one pawn exchange on the king side, Leela pushed pawns on the queen side and a pawn exchange opened the b file. In a series of exchanges the queens were off, evals slowly came down. The pawns stabilized and the game reached a RRN vs RRB position. There was a long shuffle, the game was adjudicated on move 85 after a series of exchanges.
In game 68 Leela played the first move it expected in game 67. Stockfish pushed pawns on the queen side, there was a minor piece exchange on the king side. Evals started to increase, a pawn exchange opened the d file, Stockfish moved its queen forward on the queen side and captured a pawn. The black king felt the danger and walked to the king side. The white queen retreated, a pawn exchange opened the b file, Leela regained the pawn and the game reached a RBN vs RBN position. Stockfish pushed a passer to a7 and Leela blocked with the rook.
Stockfish moved pieces forward on the queen side while the black king walked back there, Stockfish captured a pawn, Leela replaced the rook with its king as a blocker on a8. Leela pushed the c passer until it reached c2 and the white king blocked it. In a series of exchanges most pieces were off as well as the two passers and only knights remained. Stockfish was up a pawn, it captured a second pawn and the game ended in a tablebase win. Stockfish wins the game pair, it leads 22-12.
Games 69-70 started with a 22-ply rare sideline in the Sicilian Najdorf variation played in human chess. There was one pawn exchange, all pieces were on the board, white castled long and the black king was uncastled. In game 69 the engines exchanged a pair of knights, Stockfish threatened the white king on the queen side and kept its king in the center. On move 21 evals dropped, Stockfish opened the center and the black queen moved forward. Leela countered and forced the black king to move, after a series of exchanges the game reached a RR vs Q ending. Both kings were exposed, evals were low and the game was adjudicated.
In game 70 after exchanging knights Leela did not threaten the white king immediately. Stockfish captured the g7 pawn with its queen and Leela captured the g2 with a rook, the engines exchanged a pair of rooks. Leela moved its other rook, so there was no option of castling the king.
Stockfish moved a rook to the open g file, its eval started to increase. Stockfish opened the center with a pawn exchange, the white queen moved to the king side as well. The black king felt in danger and Leela moved it to the queen side. The engines opened the queen side and after a series of exchanges the game reached a QN vs QN position. Stockfish's eval was close to 4 while Leela's eval was still low.
The black queen moved to capture the white h passer. This exposed the black king to attacks, Stockfish gave many repeating checks and captured the a pawn. On move 82 Stockfish managed to get its knight to d6, by this time Leela's eval was already increasing. Stockfish saw the win in its PV, it avoided a queen exchange, Leela lost material and the game ended in mate. Stockfish wins the game pair, it leads 23-12.
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