After 70 games Stockfish leads 25-14 with 31 draws. Stockfish won one game pair of the last 5, there were 3 double draws and one draw with two white wins. Stockfish is still increasing its lead but slowly, after a gap of +9 at the half way point the gap increased by +2 in the last 10 game pairs. With 15 game pairs left it is reasonable that the final gap will be in double digits but not a record.
Games 61-62 started with a line in the Blumenfeld countergambit, Duz-Khotimirsky variation, played in high level human games. In game 61 Stockfish moved the king without castling, it captured a pawn in the center but its queen side pieces were late developing. Evals came down, in a series of exchanges Leela captured a rook for a bishop and the white king was exposed. The engines reduced to a RR vs RB position with black two pawns up. The engines exchanged a pair of rooks, both had an advanced passer that couldn't advance. Leela's eval came down and the game was adjudicated. In game 62 the engines repeated the reverse game for 39 plys. The engines continued to exchange pieces until only R vs B remained. Leela was a pawn up and evals were low, Leela created two passers before the game was adjudicated.
Games 63-64 started with a rare sideline in the Caro-Kann two knights variation, the white queen was out on the king side. In game 63 the engines blocked the center, Stockfish pushed pawns on the queen side and Leela pushed the h pawn. The black queen moved forward on the queen side, the engines opened the b file and Stockfish's eval dropped to 0. In a series of exchanges Leela gave a knight for pawns and opened the king side, then the engines reduced to a RB vs RNN position. Leela had connected passers in the center, but its eval also came down. Leela pushed the passers and Stockfish gave a knight to stop them. The game reached a drawn rook ending, when Leela's eval was low enough the game was adjudicated.
In game 64 the engines repeated the reverse game for 13 plys, and when Leela diverged Stockfish's eval jumped. The engines opened the b file and Leela concentrated most pieces on the queen side. Stockfish exchanged minor pieces and then attacked the king side with a queen and knight. More exchanges reduced to a QRN vs QRB position on move 40.
Leela pushed its c pawn and Stockfish blocked with the rook, then Leela captured the rook with its bishop. This allowed Stockfish to attack the black king while the black pieces were too far to help. Stockfish chased the black king, it captured the black queen for a knight, then the white queen managed to capture the remaining black pieces with mate following. Stockfish wins the game pair, it leads 24-13.
Games 65-66 started with a rare line in the Benoni gambit. There was one pawn exchange and most pieces were on their starting square. In game 65 the engines developed pieces and castled, after exchanging pawns and a pair of knights Leela had a passer in the center and the c file was open. In a very long PV agreement Stockfish pushed pawns on the king side, the engines exchanged minors and a pair of rooks. The a file opened and Leela moved a rook forward.
The engines shuffled, Stockfish's eval slowly increased while Leela's eval stayed under 1. On move 64 Leela's eval jumped, 5 moves later the engines exchanged minors. Leela gave a rook for a knight and connected a second passer in a QB vs QR position.
Stockfish pushed pawns on the king side and gave two pawns, I'm not sure why, perhaps it was low on time and perhaps it thought it was losing anyway. Leela now had two pairs of connected passers, it pushed the king side passers forward. Stockfish gave the queen and the rook (again, why??) and mate followed.
In game 66 the engines repeated the reverse game for 13 plys. Evals started to increase early, the engines exchanged minor pieces and then Stockfish pushed pawns on the king side with one pawn getting to f6. Stockfish created a passer after a pawn exchange on the queen side, for a few moves Stockfish offered a knight and Leela refused to take, fearing a dangerous attack on the black king. In a series of exchanges the engines reduced to a QBN vs QBN position with white a pawn up.
Leela traded bishops and exposed the white king to checks, in a pawn trade the white h pawn became a passer. Stockfish forced a queen exchange and Leela couldn't stop a queening. Stockfish queened a second pawn and mated. There were two white wins in this game pair, Stockfish leads 25-14.
Games 67-68 started with a line in the Sicilian Najdorf, Amsterdam variation. In game 67 there were no exchanges after the start, Leela castled long while Stockfish moved its king to the king side. The engines opened the h file, Stockfish pushed pawns on the queen side and evals decreased. The engines exchanged a pair of bishops and opened the c file, then exchanged more minor pieces. After all rooks were exchanged the game was adjudicated. In game 68 the engines repeated the reverse game for 21 plys up to transpositions, Stockfish castled long and Leela moved its king to the king side. The engines opened the h file, Stockfish blocked the black queen side pawns with knights. A minor piece exchange opened the d file, Leela captured a pawn on the king side while Stockfish cleared the black queen side pawns and created connected passers. The engines mostly shuffled for a while and evals came down. Leela captured a pawn and Stockfish ended the game in a check repetition.
Games 69-70 started with a line in the Old Indian defense, Czech variation. The black queen moved forward on the queen side. In game 69 the engines castled in opposite directions, a pawn exchange opened the d file and evals came down. The engines exchanged minor pieces and a pair of rooks, the black queen moved forward and threatened the white king. After some shuffling the engines exchanged queens, the game was adjudicated after another minor piece exchange. In game 70 both engines castled short, exchanges opened files on the queen side and evals came down. The engines continued to exchange pieces and pawns, the queen side pawns were cleared and Stockfish moved a rook forward. Stockfish captured 3 pawns and Leela captured a knight, the game reached a RN vs RBN position. Leela gave the bishop for passer on the 7th rank, the game was adjudicated a few moves later.
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