After 60 games Stockfish leads 23-13 with 24 draws. Leela won its third game pair, but Stockfish won twice. Stockfish's lead is now +10, its win rate is slowing and it will be harder to break the record gap. There is no doubt as to the winner of the match, even though there are still 20 pairs yet to play.
Games 51-52 started with a sideline of the Czech Benoni defense. In game 51 the engines opened the a file, exchanged a pair of rooks and Leela captured a pawn. After some shuffling the remaining rooks were exchanged, the game reached a BN vs BN position on move 43. Stockfish's eval dropped, the engines exchanged minor piecs and Leela used a bishop to block black passers. The engines traded pawns and opened the board, each pushed a passer but was blocked before the promotion square. There was a long shuffle, the game was adjudicated on move 129 close to the 50-move draw.
In game 52 the center was blocked, there was one pawn exchange on the queen side and one on the king side. Stockfish kept its king uncastled, evals were stable and the engines shuffled. The white king walked to the king side, after move 50 evals increased very slowly. On move 66 Leela pushed a pawn on the queen side and Stockfish pushed one on the king side, preparing to open the board.
Both engines were low on time, Stockfish ignored the queen side and attacked the king side while Leela captured the two white bishops. Stockfish exposed the black king and created 3 passers. The engines exchanged queens and the game reached a R vs BBN position, white 3 pawns up.
Stockfish managed to trap and capture the knight. Leela captured two pawns but still had to face 3 passers, Stockfish queened twice and mated. Stockfish wins the game pair, it leads 21-11.
Games 53-54 started with a 30-ply line in the Ruy Lopez, Chigorin defense. The center was closed and all pieces and pawns were on the board. In game 53 Stockfish gave a pawn to open a path for a bishop. Leela opened the a and h files, then the engines exchanged a pair of bishops and all rooks. The engines shuffled for a while and then the exchanges continued, the game reached a BN vs BN position on move 59. Stockfish's eval was at 0, Leela took a long time to lower its eval. The engines exchanged bishops and shuffed, the game was adjudicated on move 100. In game 54 there were no exchanges after the start, evals started to decrease. The engines opened the h file and Leela captured a pawn. A pawn exchange opened the c file and the engines shuffled for a while. On move 52 the first pieces were exchanged, Stockfish traded a rook for two minor pieces. The game reached a R vs BN position and was adjudicated.
Games 55-56 started with a sideline in the French Winawer, advance variation. The center was blocked and the white queen moved forward on the king side. In game 55 Stockfish pushed a pawn on the king side to harass the white queen, Leela exchanged pawns on the queen side and opened the b file. The black king stayed in the center, in a series of exchanges Stockfish gave a knight for two pawns and the queens were exchanged.
Stockfish moved a rook forward and the black king walked to the king side, Leela defended the c2 pawn and then gave back a knight for pawns. It captured another pawn and the c pawn became a passer. Leela continued to keep its c pawn safe, the white king slowly moved forward in the center. A series of exchanges reduced to a RN vs RN position.
Leela pushed the passer with the king supporting in front of it, Stockfish gave the knight to capture the passer. Leela captured a pawn to create another passer, Stockfish couldn't prevent a queening and mate followed.
In game 56 there were no pawn exchanges after the start, the engines exchanged all bishops and Leela castled long. The engines shuffled behind their pawn lines, on move 62 there was a pawn exchange on the queen side. The shuffling resumed and on move 107 the engines exchanged a pair of knights. After the engines exchanged queens evals came down, Leela gave a knight for two pawns and after a pair of rooks was exchanged the game was adjudicated. Leela wins the game pair, Stockfish leads 21-12
Games 57-58 started with a 20-ply rare sideline in the KID fianchetto, classical variation. The center was blocked and all pieces and pawns were on the board. In game 57 Leela pushed pawns on the queen side, Stockfish pushed the h pawn to h3. The engines opened the b file and then opened the f file, Stockfish captured a pawn in the center. Leela captured the black h pawn, then in a long PV agreement Stockfish gave a rook for a knight, the engines exchanged pieces until only QR vs QN were left. Stockfish was two pawns up with 3 passers, its eval was 0. Leela captured one passer and its eval came down, the game was adjudicated.
In game 58 the engines exchanged a pair of minor pieces on the queen side, the files remained closed. The engines shuffled for a while, on move 43 Stockfish's eval jumped. Stockfish gave a pawn on the queen side, the a file opened but Stockfish doubled rooks on the b file. After another minor piece exchange Stockfish regained the pawn, the white b pawn became a passer. In a series of exchanges the engines reduced to a RBN vs RBN position.
Leela had to watch the white b pawn, Stockfish moved the rook to the 7th rank and then captured the black c pawn. Leela managed to capture the white passer but lost its bishop. Stockfish captured the remaining black pawns, it had one pawn left and Leela couldn't stop the queening and mate. Stockfish wins the game pair, it leads 22-12.
Games 59-60 started with a line in the Alekhine defense, modern variation. In game 59 the engines played out a long PV agreement, one pair of bishops was exchanged and Stockfish had an isolated pawn in the center. The white queen moved forward and the engines exchanged queens and minor pieces, Leela also had an isolated pawn in the center. Evals slowly increased, on move 33 the game reached a RNN vs RBN position.
Both kings moved to the center, Stockfish blocked the white king moving forward on the queen side. The engines exchanged pawns on the queen side, Leela captured a pawn and created a passer. The engines exchanged minor pieces, Leela abandoned the passer and captured a pawn on the king side.
Leela captured a second pawn and created a passer. The white king moved forward and captured the last black pawn. Leela pushed passers forward and queened, Stockfish lost material and was mated.
In game 60 the engines played out a different long PV agreement, the engines exchanged queens and a pair of knights and the black king moved without castling. Evals jumped after Stockfish opened the center, on move 27 the game reached a RBB vs RBN posoition.
Both rooks moved forward, both engines captured a pawn on the queen side. The white king moved forward and captured the two black pawns on the king side that had no support.
Leela captured one pawn back but Stockfish still had a passer on the king side. Leela captured a pawn on the queen side but Stockfish moved the rook to the 7th rank and its king was in front of the white passer. Leela gave the knight for the passer, Stockfish trapped the black king in the corner and mated. There were two white wins in this game pair, Stockfish leads 23-13.
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