After 10 games Stockfish leads 4-1 with 5 draws. There were two white wins in the first game pair, of the next 4 game pairs Stockfish won 3 and one was a pair of draws. Before the start of the superfinal Leela had a score of 1-1 in game pair wins against Stockfish, but after 5 more pairs played in the suprfinal the score is 4-1 in favor of Stockfish, with 4 draws. Which is a better preictor of the superfinal result?
The opening book was created by Jeroen Noomen, with computational help from Windfishballad and Kittenkaboodle. Details can be found here.
Games 1-2 started with a sideline of the Owen defense. In game 1 there were no exchanges after the start, Stockfish had problems with piece development and Leela gained space. There was one minor piece exchange and Stockfish castled long, evals were high and stable for a while. It seemed that Stockfish was trying to hold the pawn line, but evals started to increase, Leela doubled rooks on the a file and opened it on move 38.
A minor piece exchange created a white passer on a5, Stockfish tried to open the king side with a pawn exchange but Leela kept it defended. Stockfish gave a pawn to activate its light square bishop, Leela opened the e file and moved a rook forward. Stockfish captured a pawn on the queen side while Leela captured two and created two passers on the king side. On move 66 the engines exchanged queens.
Leela pushed the king side passers forward and Stockfish couldn't stop them. A few pieces were exchanged, then Leela queened and mated.
In game 2 there were many exchanges after the start, Leela gave a pawn and castled long. The engines played out a long PV agreement, the black queen moved forward on the king side, Leela gave another pawn and opened the f file. Stockfish captured a third pawn on the queen side and exposed the black king, Leela regained one pawn and exchanged queens and a pair of rooks, resulting in a RBN vs RBN position with white two pawns up.
Stockfish moved a rook forward, Leela captured a pawn and created a passer in the center. Then in a series of exchanges the engines reduced to an opposite color bishop ending with white one pawn up and a passer on the king side. Stockfish's eval was very high, Leela was less convinced.
The position was less drawish than usual for such endings. The black bishop had no pawn targets, Stockfish gave one pawn and captured two. The black king had to choose sides and could not create a passer on the queen side. The white king supported the passer on the king side, Stockfish promoted the passer and then exchanged pieces. It then queened another passer to win. There were two white wins in this game pair, the score is 1-1.
Games 3-4 started with a rare sideline of the Caro Kann advance variation. In game 3 the engines exchanged minor pieces and on move 20 the game reached a QRR vs QRR position. Stockfish's eval dropped to 0, Leela had a passer in the center but it couldn't move it forward. The white king walked to the queen side, Stockfish attacked with its queen and Leela exchanged queens. The engines shuffled until Leela lowered its eval for the draw rule.
In game 4 the engines exchanged a few minor pieces and Stockfish created a passer in the center. The engines exchanged a pair of pawns on the queen side, both queens were there but were not exchanged. Evals remained stable until move 32.
The engines seemed to shuffle but evals slowly increased. On move 47 a pawn exchange opened the a file. Leela captured a pawn and surprised Stockfish, Stockfish's eval dropped below 1 but then Leela again did not play what Stockfish expected and its eval shot back up. A series of exchanges reduced to a QRB vs QRN position.
Stockfish used the exposed black king to capture a pawn. Leela regained the pawn and exchanged queens. Stockfish then captured two pawns and Leela lost the rook for a passer. Stockfish created another passer, queened and mated. Stockfish wins the game pair, it leads 2-1.
Games 5-6 started with the King's gambit, bishop gambit Bledow variation, with a bias for black. The black queen was out on the king side and the white king moved without castling. In game 5 the engines exchanged queens after Stockfish castled. Stockfish pushed pawns on the king side, evals came down in a long PV agreement where Leela gave a rook for a knight and pawn. Most king side pawns were gone, Leela gave the second rook for a bishop and pawn. The black king moved forward and the engines reduced to a BBN vs RRB position. Leela had a passer in the center, Stockfish moved its rooks forward to attack the white king and chose to end the game in repetition. In game 6 the engines played out a long PV agreement in which they exchanged queens and Leela castled long. Stockfish's eval came down, Leela moved its knights forward and its eval stayed close to 1. The black knights were exchanged and the game reached a RRB vs RRB position, Leela with two passers. Stockfish captured one passer, Leela pushed the other to the 2nd rank blocked by a rook. The engines shuffled, after exchanging a pair of rooks Leela lowered its eval enough for adjudication.
Games 7-8 started with a rare line in the Sicilian Kan, Swiss cheese variation. In game 7 the engines exchanged a pair of knights and opened the d file. Leela blocked the file with a bishop and pushed pawns on the queen side. Stockfish moved a rook forward and sacrificed it for a bishop and pawn. Stockfish's eval came down, the engines reduced to a QRB vs QBN position and started to shuffle. After exchanging minor pieces the shuffling resumed, the game was adjudicated on move 115 after Leela lowered its eval.
In game 8 a series of exchanges in a PV agreement opened the c file, a few minor pieces were exchanged and evals increased. Leela created a passer in the center, Stockfish pushed a pawn to h6 and then created its own passer in the center. Stockfish captured a pawn on the king side and the h pawn became a passer as well, a series of exchanges reduced to a double rook ending with white two pawns up.
Stockfish let the h pawn be taken, it blocked the black passer and both kings moved to the queen side. Stockfish captured all the black pawns, the black king became trapped, Leela lost material and was mated. Stockfish won the game pair, it leads 3-1.
Games 9-10 started with a 20-ply sideline of the KID fianchetto, classical main line. In game 9 the center was blocked, the engines opened the c file. The engines pushed pawns on the queen side and opened the a file. All rooks were exchanged and after a while the queens were also exchanged. The game reached a BB vs NN position and the engines started to shuffle. Close to the 50-move limit Leela lowered its eval and the game was adjudicated on move 100.
In game 10 the engines repeated the reverse game for 10 plys, again opening the c file. The engines played out a long PV agreement, exchanging minor pieces and a pair of pawns and evals stayed stable. For a while the engines semmed to shuffle, though Stockfish's eval slowly increased. On move 36 Stockfish opened the center.
It took Leela 3 more moves to see that it was in trouble. It surrounded its king with the major pieces while Stockfish captured the two supporting pawns on the king side. In a series of exchanges the queens were gone and Stockfish traded two bishops for a rook. Stockfish had connected passers on the king side, Leela gave back the two bishops for a rook to capture one passer. The game reached a RN vs RN position.
It took a while for Stockfish to push its passer, then it gave the rook for a knight and queened the passer, followed by mate. Stockfish wins the game pair, it leads 4-1.
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