After 60 games Stockfish leads 9-4 with 47 draws. Stockfish added two game pair wins, increasing its lead to 5. Leela needs wins to try to catch up, this is looking more and more like another Stockfish superfinal win.
In games 51-52 white castled long while black kept its king in the center and pushed pawns on the king side. In game 51 the engines played a very long PV agreement, starting from Stockfish giving a rook for a knight. Stockfish castled short and fortified the king side with its bishops. On move 37 the game reached a RR vs RB position, still in PV agreement and with evals under 0.5. By move 56 both engines were down to their last pawn. Both pawns advanced slowly, both were eventually one square away from promotion. Evals were low enough for adjudication on move 94 after the pawns stopped moving.
In game 52 again the engines played out a long PV agreement but this time material was equal, Stockfish's eval increased steadily. After Leela castled there was a series of exchanges, the engines reduced to a RBB vs RBB position and Stockfish went a pawn up.
Stockfish concentrated on the queen side where it had a pawn majority. It gave a pawn to disconnect the black pawns and create a passer. Leela couldn't protect both its pawns there and Stockfish captured one. After exchanging a pair of bishops Stockfish connected a second passer on the queen side, evals were over 5.
The ending was slow, Leela did all it could to delay the white pawns on the queen side. After 30 moves Stockfish finally promoted a pawn and Leela had to give its rook to capture it. There were no white pawns left but the material was sufficient for a win. Stockfish wins the game pair, it leads 8-4.
Games 53-54 started with a 6-ply book in the Robasch defense with black offering a pawn. In both games white took the pawn, but then the games diverged from the usual line and black didn't take back immediately. In game 53 the engines continued to develop with a few exchanges and evals came down. The queens were exchanged early, Leela kept its pawn advantage but Stockfish trapped a white bishop. After a series of exchanges only RN vs RB remained, evals were close to 0 and the game was adjudicated when the pawns stopped moving. In game 54 there were a few exchanges after the start and the queens stayed on the board. Evals came down as the engines gradually exchanged pieces and pawns, the game was adjudicated in a QRN vs QRN position still with white a pawn up.
Games 55-56 started with another side-line variation in the Robasch defense. In game 55 Stockfish's eval was over 1 from the start. After Leela castled long the engines played out a long PV agreement. Stockfish gave a bishop for a pawn and castled short, then the material was equalized and the game reached a RRB vs RRB position on move 22. Stockfish's eval came down and the engines exchanged bishops. The engines shuffled and captured pawns until there were only two white pawns left on the king side. Both engines agreed this was a draw, though I was not aware of a double rook ending two pawns up (connected passers at that) that was a draw. The game was adjudicated when the pawns stopped moving. In game 56 both engines casled short. The engines again played out a long PV agreement, they exchanged pieces including queens and opened the queen side. Stockfish gave a pawn and then exchanged R for BN, reducing to a RBN vs RR position on move 37. After exchanging a pair of rooks the engines shuffled until Stockfish lowered its eval enough for the draw rule.
Games 57-58 started with a Caro Kann variation that both engines thought were completely drawn. In both games the black queen came forward and captured the b2 pawn and the rook in the corner, white captured a bishop and trapped the black queen. In game 57 Stockfish gave its queen for two minor pieces, the game reduced to a QR vs RRN position on move 18. Stockfish pushed a passer on the queen side, Leela blocked with its rook, the game ended early by a 3-fold repetition. In game 58 Leela gave its queen for RB, the game reduced to a QB vs RRN position on move 25. Evals were low, Leela surrounded its king with pieces, the game was adjudicated when the pawns stopped moving.
In game 59 the center was blocked, the engines formed long pawn lines without exchanges. All bishops were exchanged and the white king moved to the king side without castling. There was one pawn trade on the queen side, files were still closed and the engines shuffled for a while. Leela tried to attack from the king side, Stockfish captured a pawn and created a passer on the queen side, its eval coming down. Stockfish gave a knight for a pawn and reduced to a QNN vs QN position. Leela's queen blocked the black pawns on the queen side, Stockfish exchanged a pair of knights and its queen gave checks to the exposed white king. The game was adjudicated with the PV predicting a drawn queen ending.
The start of game 60 was a little different but it transposed back to the previous game, then followed the same move sequence until move 23 with no bishops and one pawn trade on the queen side. After shuffling for 20 moves Stockfish pushed the g pawn, Leela's king was still uncastled and the king side stayed closed. Stockfish's eval jumped over 3 though it seemed to continued shuffling its rooks, it doubled rooks on the c file and pushed a pawn there.
A series of exchanges opened the queen side and Leela quickly castled. Stockfish went two pawns up and the game reduced to a rook ending. Stockfish had doubled pawns on the king side, so perhaps less than a full two pawn advantage, but Stockfish saw the win.
Both engines pushed pawns forward, Leela couldn't hold on to its pawn with its rook in front. It refused to take a white pawn, trying to avoid a 6-man position, but eventually gave up. Stockfish wins the game pair, it leads 9-4.
No comments:
Post a Comment