The network crashed in game 70 and it was later resumed.
Games 61-62 started with a variation of the Trompowsky attack where white lets the black queen grab two pawns on the queen side. In game 61 AllieStein walked its king to the king side. Stockfish pushed pawns on the king side, it had to be careful because its own king was exposed and most defenders were on the queen side. Evals dropped to 0, AllieStein ignored an attack on its knight on the queen side and planned a king side attack. It was following its PV automatically and failed to see Stockfish's reply on move 24. Evals immediately jumped and AllieStein realized it was in trouble, Stockfish had an immediate mate threat.
The engines exchanged queens and the kings were no longer in danger. Stockfish was up a rook for a bishop but its queen side pieces had to develop safely. AllieStein used the time to gain a few pawns, the game reached a RBN vs RRB position with apparent material equality but Stockfish had a huge eval advantage.
The d6 pawn was soon captured. Stockfish's rooks did not allow the white king to leave the king side, the black king was an extra piece on top of the material advantage. The game was adjudicated when evals were high enough. This was the first win for black in the match.
In game 62 the black queen escaped to the king side, AllieStein trapped a white bishop. Stockfish captured two pawns for the bishop and won a rook, then AllieStein gave a knight for two pawns. Stockfish was up a rook for 2 pawns, AllieStein compensated with two connected central passers facing an exposed white king, and evals were at 0. Stockfish castled and AllieStein pushed a passer to the 2nd rank. When it pushed the second passer forward Stockfish gave a knight and captured the passers. All remaining pawns were on the king side, after some shuffling the engines exchanged down to a B vs BN position with Stockfish 2 pawns up. The endgame was very long, AllieStein thought it had an advantage when it blocked the white pawns and pushed its single pawn forward. Its eval peaked around (negative) 4.5, but there was no real advantage. The game finally reached a tablebase draw on move 125.
In game 63 the engines mostly played behind their pawn lines, AllieStein's eval was around 2. Stockfish opened a file on the queen side and doubled rooks. The engines exchanged all knights and a pair of rooks, Stockfish's eval dropped to 0 and the game reached a RBB vs RBB position. The engines shuffled, AllieStein's eval came slowly down as it couldn't break the pawn wall. The game was adjudicated when evals were low enough for the draw rule.
There were a few quick exchanges at the start of game 64, evals were over 1. After the engines castled Stockfish pushed pawns on the queen side and its eval started to increase. After a few exchanges the queen side opened and AllieStein was a pawn up, all the black pieces were on the queen side yet AllieStein thought it was safe with an eval of 0. It did not anticipate Stockfish's next move.
Stockfish sacrificed a bishop and opened the king side immediately. AllieStein thought white would first move its queen to give the bishop support. Now Stockfish threatened mate on the h file, AllieStein realized this when it stopped to think a few moves later. It exchanged queens but Stockfish doubled rooks on the 7th rank.
Stockfish captured the black g pawn and pushed the e pawn to the 7th rank, then moved its rooks to the 8th rank. All of the black pieces were busy preventing the pawn from queening, Stockfish pushed another pawn forward, it still had another pawn and its king was free to advance as well. The game was adjudicated quickly. An unexpected win for Stockfish in the French opening, where NN engines are usually better.
There were almost no exchanges after the start of game 65, AllieStein’s eval was over 1. The engines exchanged pawns on the queen side, the first piece was exchanged on move 29. AllieStein gave a rook for a bishop and pawn, Stockfish’s eval came down to 0. After exchanging queens the game reached a RBB vs RRB position, AllieStein two pawns up and with a queen side passer. Stockfish captured the passer on the 7th rank and the engines exchanged bishops. AllieStein’s eval kept the game going, it reached a tablebase draw on move 125. In game 66 the engines exchanged pawns and pieces slowly and evals came down to 0. AllieStein’s eval turned negative, and then it jumped over 2 after the engines opened two files on the queen side. The engines started to shuffle, Stockfish’s eval was a constant 0. After exchanging all rooks the shuffling resumed, AllieStein lowered its eval slowly. The game ended in a 50-move draw.
In game 67 the engines castled in opposite directions. The black pawns on the queen side were gone early, however the white king was safe behind knights and pawns. The engines exchanged queens and then mostly shuffled, the game ended by the draw rule on move 37. In game 68 Stockfish's eval was 0 throughout the game. Stockfish castled long and AllieStein pushed pawns on the queen side, its eval negative under 1. After a long series of exchanges only RRN vs RRN remained, for some unknown reason AllieStein used almost all its time on one move and had only seconds left for the remainder of the game. The engines exchanged knights and captured most pawns, AllieStein wouldn't lower its eval for the draw rule. The game ended in a tablebase draw on move 124.
The engines played behind their pawn lines for the first 20 moves in game 69, then they started to exchange pieces and pawns. AllieStein gave two bishops for a rook and the game reached a 7-man R vs BN ending on move 46. Evals came down to 0 and the game ended in a tablebase draw a few moves later. In game 70 there were a few exchanges after the start, Stockfish concentrated its forces on the queen side. On move 23 both engines created passers on the queen side, then all the pieces moved either to support or to block these passers. The engines shufled for a while, after exchanging a pair of rooks the shuffling continued. The game ended with a 50-move draw.
No comments:
Post a Comment