Wednesday, May 22, 2019

Season 15 superfinal, games 51-60

After 60 games Leela leads 8-5 with 47 draws. Last 10 games were all draws, no change in the score.

Games 51-52 started with black a pawn up. In game 51 Stockfish exchanged pieces and its eval remained low. The white major pieces were active in the center and Leela had to defend the back rank. Stockfish put a rook on the 7th rank and the engines started to shuffle. On move 64 the engines started to exchange pieces and the game reached a queen ending. Leela played on and didn't lower its eval for a long time, the game ended in a tablebase draw on move 143. In game 52 the engines locked the queen side and didn't push the remaining pawns. They exchanged pieces gradually until reaching a rook ending on move 42. Stockfish went a pawn up and its eval was around 1, but the ending was a draw. The game was adjudicated only on move 144. 

All knights were off early in game 53, evals started at 1 and slowly came down. The engines kept all the pawns until move 25. The king side was blocked, the engines opened a file on the queen side and Stockfish's major pieces controlled it. After exchanging queens only RRB vs RRB remained on move 32. Leela went a pawn up and Stockfish ended the game with perpetual check. In game 54 the engines opened the queen side and center. On move 25 Leela exposed the black king, yet Stockfish's eval went down to 0 and stayed there. After exchanging queens only RBB vs RBB were left on move 34, Leela's eval came down as well. The engines reduced to a same color bishop ending, Leela kept playing until it lowered the eval for the draw rule on move 116.

Stockfish started game 55 with an eval over 1. Leela's eval clilmbed over 2 as the engines exchanged queens and Stockfish captured a rook for a knight early in the game. There were only a few piece exchanges as the engines' pawns advanced, evals came slowly down and were under 1 when the game reached a RRB vs RBB position on move 38. Leela created connected passers in the center that compensated for the material, evals dropped to 0. Pawn moves kept the game going, Stockfish gave a rook to get rid of one black passer and create two pairs of white passers on both sides. Leela gave a bishop to get rid of the pair on the king side. The game reduced to a 7-man RB vs RB position and ended by the 50-move rule on move 186. In the reverse game 56 Leela's eval remained over 1 for a long time. There were many early exchanges and the game reached a RRB vs RRB position on move 22. The engines shuffled with a few pawn moves, Stockfish's eval remained low. A series of exchanges reduced to a B vs R ending on move 85, Leela with a pawn on the 7th rank. Leela's eval came down and the game ended in a tablebase draw.

Games 57-58 started with a 22-ply book in the Benoni defense. Evals started over 1 in game 57. The engines cleared the queen side pawns in a series of exchanges, Stockfish's eval dropped to 0. The engines continued to exchange pieces and only RN vs RN were left on move 34. Stockfish was a pawn up but Leela's eval also came down. The game reached a drawn rook ending and was adjudicated. In game 58 Leela's eval jumped over 2 when Stockfish sacrificed a bishop and knight for 4 pawns. All the king side white pawns were gone and the white king was exposed and under attack. It ran to the center, Stockfish opened the queen side and threatened to add rooks to the attack. A series of exchanges stopped the attack and left a QRB vs QB position on move 35, Stockfish was 4 pawns up and Leela had only one pawn left. Stockfish's eval was 0, it gave checks and attacked the white pieces with the queen. On move 71 Leela gave material back and the game reduced to a bishop vs pawns ending, the game reached a tablebase draw.

Games 59-60 started with black two pawns up in a Danish Gambit. There were many early exchanges in game 59, only RRN vs RRB remained on move 24, Stockfish one pawn down. Stockfish pushed a pawn to h6 and placed a rook on the 7th rank, its eval dropped to 0. On move 45 the game reached a double rook ending with equal material, Leela played on and the game ended in a tablebase draw on move 90. In game 60 there were again many early exchanges and the game reached a RB vs RN position on move 23, Stockfish a pawn up and evals close to 0. Leela equalized material, the engines continued to capture pawns and the game ended in a tablebase draw on move 44.

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