There were a few exchanges after the start of game 51 and the engines started to shuffle early. After almost 50 moves there were several exchanges and the queen side opened. The engines slowly exchanged pieces until reaching an opposite color bishop ending and the game was adjudicated. In game 52 Stockfish pushed pawns on the king side and its king was quite exposed. After a series of exchanges the game reached a QR vs QB position on move 34, black two pawns up. After a while the pawns stabilized and Stockfish's eval came down to 0. Both kings were exposed and both engines could give checks, the game ended in a check repetition close to the 50-move draw.
There were many exchanges after the start of game 53 and only RBN vs RBN were left on move 23. Stockfish's eval came down to 0, AllieStein's eval remained too high for the draw rule for a long time. The engines slowly exchanged pieces and pawns until reaching a rook ending, the game ended in a tablebase draw on move 106. There were no exchanges at the start of game 54, AllieStein pushed pawns on the king side, it had more space for its pieces and its eval turned negative. The engines exchanged pawns on the king side and then mainly shuffled, Stockfish went a pawn up and its eval was close to 0 yet AllieStein's eval was around 1.5 (negative). AllieStein avoided a 50 move draw, the engines started to exchange pieces and open the position. AllieStein gave a rook for a knight, its bishop pair threatened the white king and evals jumped again. The game reached an unusual QN vs RBB position, AllieStein had an advanced passer that cost Stockfish its knight. At this stage AllieStein's eval was over 6, it peaked close to 8, yet incredibly Stockfish's queen seemed to be holding the defense by itself. One bishop was pinned and AllieStein could get no more than checks. Evals slowly came down, AllieStein lost its last pawn to avoid a 50-move draw. AllieStein continued to play but it lost its chance (if there was one). The game ended in a tablebase draw on move 242.
In game 55 the engines castled in opposite directions, Stockfish's eval was 0 almost from the start. Stockfish opened the queen side and placed its major pieces facing the white king. AllieStein opened the king side and defended its king. A series of exchanges led to a R vs BN imbalance and a QR vs QBN position on move 43. After exchanging queens only two white pawns remained in a 7-man position, AllieStein played on until a tablebase draw.
In game 56 Stockfish castled long and AllieStein pushed its queen side pawns. Evals jumped when AllieStein sacrificed a knight and opened the queen side. Many black pieces and pawns were facing the white king yet Stockfish was confident it could hold off an attack and its eval increased over 2.
Stockfish opened the b file and exchanged a pair of rooks, AllieStein doubled queen and rook in the open file. The black attack looked very dangerous yet Stockfish calmly played on the king side. For a while it seemed AllieStein was not sure how to proceed and evals slowly drifted down. Then AllieStein let go of a pawn in the center and evals jumped again.
Stockfish pushed its pawn to d7 to add a constant threat on the back rank. Then it gave a rook for a knight and pawn and exchanged all bishops. Only QNN vs QR remained, most of AllieStein's attack was over. It was no longer a piece behind but Stockfish still had a material advantage.
AllieStein removed the pawn on d7, Stockfish added two connected passers in the center to the passer on the king side. The white knights controlled the black pawns on the king side and AllieStein realized it had no hope, the game was soon adjudicated.
In game 57 AllieStein pushed two pawns to the 6th rank early, its eval went over 1. Stockfish exchanged queens and its eval dropped to 0, AllieStein's eval climbed over 1.5 and the engines started to shuffle. AllieStein avoided a 50-move draw, after a long series of exchanges only RN vs RB remained with pawns only on the king side. AllieStein was a pawn up but it was a doubled pawn and the king side pawns could not advance. AllieStein's eval kept the game alive, it ended in a tablebase draw on move 175. In game 58 queens were off early and AlllieStein was a pawn up. Stockfish concentrated on the queen side, the engines exchanged pieces and pawns until all the pawns on the queen side were gone and material was equal. The game reached a RBN vs RNN position and the engines started to shuffle, evals were close to 0 and the game was adjudicated quickly.
AllieStein's eval increased over 1 after the start of game 59. Both engines were in no hurry to attack, AllieStein gave a rook for a bishop and pawn, then created a passer in the center. The game reached a QRN vs QRR position, AllieStein's eval was over 1.5 and Stockfish's eval came down to 0. After some shuffling the engines exchanged a pair of rooks and AllieStein's eval came down as well. Both kings were exposed and the engines could give checks, the game ended in a check repetition.
In game 60 AllieStein pushed a pawn to a3 while the white king was on the other side, evals were over 1. Stockfish opened a file in the center and pushed two pawns on the queen side. After several exchanges Stockfish was a pawn up with a passer on the 6th rank.
Stockfish pushed the passer to the 7th rank where AllieStein blocked it with a rook. After exchanging the remaining minor pieces and pawns on the queen side the focus of the game became the white passer. One black rook could not move, AllieStein's only hope was a counterattack on the white king.
For a while there was no progress, then Stockfish offered a pawn on the king side. AllieStein accepted and evals jumped immediately. With the second black rook out of the way Stockfish could now move its rook to the 7th rank.
AllieStein's queen had to protect the b8 rook, Stockfish moved its rook forward and now it could also threaten the black king. AllieStein couldn't defend against all the threats and the game was soon adjudicated.
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