After 80 games Stockfish leads 27-16 with 37 draws. All the last 5 game pairs were drawn, 4 had two white wins. Stockfish continues to lead by 11 wins and there are 10 pairs left in the match. Leela's non-win streak is now 21.
Games 71-72 started with a 20-ply sideline in the King's Indian defense played in human chess. All pieces and pawns were on the board. In game 71 the engines exchanged minor pieces on the king side and then opened the e file. Evals slowly increased, there was a pawn exchange on the queen side. For a while Stockfish blocked the center with minor pieces, eventually Leela exchanged a pair of bishops and a pair of rooks.
After a few shuffling moves Leela moved its rook to the e file and its queen moved forward on the queen side. A knight exchange created a white passer on e6 and reduced to a QRB vs QRN position. Stockfish pushed pawns and locked the king side, Leela exchanged queens and its passer reached d7.
Stockfish captured the white d passer, the engines traded pawns and Stockfish created a passer on the queen side while Leela had a pawn majority on the king side. Leela captured a pawn on the king side and pushed its passers, Stockfish had no good counter, it lost more material and the game ended in a tablebase win.
In game 72 the engines exchanged minor pieces on the king side and opened the e file as before, the continuation was a little different though there was a pawn exchange on the queen side. Stockfish's eval slowly increased, Leela's eval remained stable. The engines exchanged a pair of rooks, Stockfish captured a pawn on the queen side and Leela avoided a queen exchange. Stockfish created a passer on the queen side through a knight exchange, the game reached a QRB vs QRB position.
Stockfish moved the bishop to c4 to keep all its queen side pawns protected. Leela avoided exchanges, its eval increased a little and the engines shuffled for a while. Leela blocked the queen side and the b passer, on move 49 the queens were exchanged.
Stockfish used its king as an additional piece, first to support a pawn exchange on the king side that opened the f file, then to support a pawn exchange on the queen side that opened the c file. After a pawn trade Stockfish created a passer on the king side. Leela gave the knight for the b5 passer, Stockfish queened the king side passer to win. There were two white wins in this pair, Stockfish leads 24-13.
Games 73-74 started with a 24-ply sideline in the Ruy Lopez, Chigorin defense variation played in human chess. The center was blocked, all pieces and pawns were on the board. In game 73 the engines opened the b file and Stockfish created doubled passers on the a file. Then a minor piece exchange created moved one black passer to b3. Evals increased a little, Leela captured the black b passer and the engines exchanged a pair of rooks. Leela gave back the pawn and created a passer in the center.
The engines mostly shuffled for a long time, their evals not changing a lot. The king side was locked, on move 63 the remaining rooks were exchanged. Evals started to increase again, Leela moved the queen forward and on move 79 the queens were exchanged. The game reached a BN vs BN position.
Both knights captured pawns, Stockfish captured the b5, f3 and g4 pawns, but Leela captured the h6 pawn which was more important. Leela had two advanced passers, Stockfish lost its knight and the king stopped one passer. Leela gave the bishop to stop the black a passer, then queened its remaining passer. The game ended in a tablebase win.
In game 74 the engines played a while without exchanges, on move 22 the pawn exchanges started on the queen side, opening the a and b files. Both engines created a passer, the engines exchanged a pair of rooks. On move 38 Leela pushed the f pawn, this led to the opening of the g file. Stockfish's eval jumped over 2 while Leela's eval was low, it didn't expect Stockfish to capture the black passer on the 40th move.
Leela's eval jumped a few moves too late. The engines exchanged a pair of bishops and Stockfish moved its major pieces to the king side. The exchanges continued and the game reached a knight ending on move 60, with white two pawns up. Stockfish pushed two passers forward, when the white king moved to support them Leela could not avoid a queening. The game ended in mate. There were two white wins in this pair, Stockfish leads 25-14.
Games 75-76 started with a sideline in the Caro-Kann, two knights attack variation. In game 75 there was a pawn exchange on the queen side, both engines castled their kings and Leela had strong pawns in the center. The engines exchanged a pair of bishops, the white d pawn became a passer. On move 24 evals started to increase, a pawn exchange opened the f file. The queens moved to the king side, a series of exchanges opened the h file and exposed the black king, Leela was a pawn up. The white king had minimal pawn support but the g pawn was also a passer. The queens were exchanged on move 43.
Stockfish regained the pawn and exchanged a pair of rooks, reducing to a RBN vs RBN position. Leela captured a pawn again and then gave the g passer. The kings moved forward and after a while the remaining rooks were exchanged. Leela captured a pawn and the a6 pawn became an unstoppable passer. Stockfish pushed the b pawn but Leela captured it, Leela queened and mated.
In game 76 evals increased steadily from the start. The engines exchanged pawns on the king side and castled their kings. Pawn exchanges on the queen side opened the a and c files, Leela created a passer there. The engines exchanged a pair of bishops, Stockfish pushed the h pawn and opened the h file. The engines exchanged a pair of rooks, then all remaining minor pieces. Stockfish created a passer in the center and the game reached a QR vs QR position.
Leela couldn't protect both the b and d pawns, the white queen moved forward and captured the d5 pawn. The engines exchanged rooks and traded pawns, Stockfish pushed its passer to e6 and saw the win in its PV. The white king moved forward and captured another pawn, the queens were exchanged and the game ended in a tablebase win. There were two white wins in this pair, Stockfish leads 26-15.
Games 77-78 started with a sideline in the Dutch defense, Queen's knight variation. All pieces and pawns were on the board, both kings were castled. In game 77 there was a pawn exchange in the center, evals came down quickly and the engines exchanged a few minor pieces. The e file opened and there were more exchanges, the game reached a queen ending and was adjudicated on move 44. In game 78 there were no exchanges right after the start, a few moves later there were pawn exchanges on the queen side. The black queen moved forward on the king side and there was a pawn exchange there. Evals started to come down, the black queen retreated and the engines shuffled for a while. On move 39 there was a minor piece exchange, first pieces off the board. Then queens were off in a series of exchanges, both engines had a passer and Leela had a bishop pair advantage. Stockfish captured a pawn and the game reached a RRN vs RRB position. Stockfish captured more pawns, but Leela ended the game in perpetual check and a repetition.
Games 79-80 started with a 22-ply rare sideline of the Benoni defense, Taimanov variation. There was one pawn exchange and all pieces were on the board. In game 79 there was a minor piece exchange on the king side, evals slowly increased. The black queen moved forward on the queen side, came back, moved forward on the king side and came back again. On move 30 Stockfish created a pawn majority on the queen side. Leela doubled rooks on the half open g file, Stockfish doubled rooks on the c file, opened the b file and created a passer.
Leela moved a bishop to c6 to disconnect the rooks from the c4 passer. Stockfish moved a rook forward on the b file to support the pawn, the engines exchanged a pair of rooks. Stockfish gave a rook for the blocking bishop and a pawn, still holding on to its passer. The game reached a QRN vs QBN position, Leela captured the black passer and Stockfish created two new passers. On move 61 queens were exchanged.
Leela captured the two black passers on the queen side, Stockfish managed to regain a pawn after exchanging knights but the game ended in a tablebase win.
In game 80 the engines exchanged bishops in the center and opened the c file. More minor pieces were exchanged and Stockfish captured a pawn. Evals increased, Leela doubled rooks on the c file and Stockfish pushed pawns in the center. On move 28 Stockfish gave a knight for a pawn and created connected passers in the center.
Leela captured a pawn on the queen side, Stockfish pushed the e4 pawn, after exchanging queens Stockish had 3 connected passers in the center. Leela lost a rook for a passer, it captured the other two passers and Stockfish saw the win in its PV. The game reached a R vs N ending, black with two pawns up. The white king moved forward and Stockfish captured pawns, the game ended in a tablebase win. There were two white wins in this pair, Stockfish leads 27-16.
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