After 80 games Stockfish leads 13-6 with 61 draws. Leela won one game pair, reducing Stockfish's lead a little. However the lead is still very significant with only 10 more game pairs to play in the superfinal.
In game 71 Stockfish's eval was around 1 from the start. After the engines completed their development Stockfish opened a file on the queen side and moved a rook forward. Leela took over the open file and its eval started to increase. Stockfish grabbed a pawn on move 24, Leela thought that was a mistake. It thought for 8 minutes, its move surprised Stockfish and its eval jumped over 3. Leela moved a rook to the back rank, and the black forward rook was trapped.
Stockfish tried to counter attack with its queen on the king side while Leela doubled rooks on the back rank. Stockfish managed to exchange queens, capture another pawn and break its rook out of the trap. However, Leela captured the black bishop and reduced to a RB vs R position on move 38.
The engines traded pawns, Leela was down to its last pawn and it made sure it was protected by its king. Stockfish tried to avoid exchanges and a tablebase position, Leela pushed its pawn slowly. When the pawn reached the 7th rank Stockfish had no choice but to take and accept the loss.
In game 72 there were no exchanges for a while after the start. From move 15 the engines played out a long PV agreement, the queen side opened, a pair of knights was exchanged and Stockfish went a pawn up. Gradually more pieces were exchanged, on move 41 only RRN vs RRN remained. The engines shuffled for 30 moves without changing evals, then they reduced to rook ending. Stockfish was still a pawn up but that was only good for a draw, the game was adjudicated on move 109. Leela wins the game pair, Stockfish leads 13-6.
Games 73-74 started in the Neo-Gruenfeld defense with the engines castling in opposite directions. In both games the engines followed a known line until move 15, where white has a central passer. In game 73 the engines played out a long PV agreement until move 24, exchanging a few minor pieces. Evals came down as the engines continued to exchange pieces, reaching a QRR vs QRR position on move 30. The engines exchanged a pair of rooks and Leela went a pawn up, but evals were close to 0. Leela gave a queen for a rook and pushed its passer to the 7th rank. Stockfish ended the game in a perpetual check draw. In game 74 the engines continued differently but still with a long PV agreement, exchanging a few minor pieces and opening a file in the center. Leela gave its queen for two rooks, Stockfish pushed the passer to the 6th rank but there it was captured. The engines reduced to a QB vs RRN position, evals came down and the game was adjudicated when the pawns stopped moving.
Games 75-76 started with a wild 20-ply book in the Vienna Steinitz gambit, white was a knight and pawn up, the white king was exposed on e2, the black king was hiding behind a white pawn on the queen side. The games repeated 12 plys, white gave back a knight, the engines exchanged queens and the white king came forward. Game 75 continued with a long PV agreement, the engines reduced to a double rook ending with Leela a pawn up on move 28. Evals came down, Stockfish regained the pawn and exchanged a pair of rooks. The game was adjudicated when the pawns stopped moving. In game 76 the engines exchanged a pair of rooks, Stockfish was up a pawn and tried to keep two passers on the queen side. The engines reduced to a RBN vs RBB position on move 28 and evals came down. Stockfish couldn't push its passers forward, eventually the rooks were exchanged and evals were close to 0. The engines continued to exchange pieces and pawns until reaching a drawn bishop ending.
Games 77-78 started with a 20-ply book in the French MacCutcheon, Dr Olland variation, black was a pawn up and white was ahead in development. In game 77 Leela gave away two more pawns, then in a PV agreement the engines exchanged queens and Leela captured two pawns back. The black king came forward, Leela castled late, evals came slowly down. The black queen side rook was trapped in the corner, Stockfish found a way out for it and in a series of exchanges the engines reduced to a RB vs RB position. Leela was up a pawn but it was only good for a draw. Game 78 repeated almost excactly, on move 26 the position was still the same as in the previous game. Stockfish equalized material, the pieces stayed on the board longer. The game reached a RBN vs RBN position on move 35 and Stockfish went a pawn up. Stockfish had a passer on the king side, however both evals were close to 0 and the game was adjudicated.
Games 79-80 started with a 26-ply book in the Ruy Lopez closed, Chigorin defense, without any exchanges. In game 79 the engines opened the king side, Leela exchanged minor pieces and pawns and the black king was left with one supporting pawn. Leela attacked with its queen moving forward, then a series of exchanges left a RN vs RN position. Leela had a passer on the king side but evals were low. After exchanging knights Leela went up a pawn, its eval came down slowly and the game was adjudicated only on move 100. In game 80 the engines opened the queen side and exchanged a few pieces there. Stockfish moved its queen forward but Leela blocked the entry. Evals came down and the game was adjudicated with most pieces on the board.
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