Standings after RR6
Stockfish and Leela continue to lead, both had 4 game pair wins in the third DRR. The gap to KomodoDragon increased a little, it only had a score of +3 in the DRR. This includes a loss to Stockfish and a double win against Stoofvlees (first black win in the division).
Stoofvlees and AllieStein are in a private race for 4th place, AllieStein is getting closer but hasn't caught up yet and time is running out.
Game 149 between AllieStein and KomodoDragon was a long shuffle match. AllieStein would not lower its eval and the game went on for 333 moves. Not an all time TCEC record, but definitely a contender.
The top4 vs bottom4 trend continues, in this DRR top4 engines won 10/16 game pairs against bottom4 engines without loss.
Interesting games
game 114, KomodoDragon - Igel: KomodoDragon's eval jumped after Igel weakened the king side, KomodoDragon moved pieces there and opened the g file. Igel exchanged pieces until only RRB vs RRN remained, the doubled white rooks on the g file were still very dangerous. KomodoDragon gave a pawn and captured a rook for a bishop, it blocked the black passers with its king and slowly pushed the h pawn forward. Igel was forced to exchange a pair of rooks to stop the h pawn, the R vs N ending was a win for white.
game 115, Leela - Ethereal: There were very few pawn exchanges after the start and all pieces were on the board for a long time. Leela had a pawn majority on the king side, evals increased as the engines played behind their pawns. Ethereal tried to open the queen side, nothing came out of it. The engines exchanged a pair of rooks on move 38, Leela's eval was over 5. Leela pushed pawns on the king side and moved its queen forward on the queen side. Ethereal was completely paralyzed, Leela cleared the black pawns on the queen side and pushed passers forward. Ethereal gave material but couldn't prevent mate.
game 116, Stoofvlees - ScorpioNN: The center was blocked and there were no exchanges for a long time. The engines mostly shuffled, only the king side pawns stayed behind and offered some potential of a break in the pawn wall. On move 34 the engines exchanged minor pieces for the first time, the first pawn exchange was on move 48. Stoofvlees gave a bishop to create connected passers on the king side, evals started to increase when most pieces were exchanged off and Stoofvlees gave a rook to promote a pawn to a queen. The game reached a Q vs RN ending, the white queen captured pawns when Stoofvlees could avoid a check. The game continued for 30 moves, when ScorpioNN was sure it was losing it allowed a mate in 1.
game 120, Stockfish - KomodoDragon: See featured game below.
game 121, KomodoDragon - AllieStein: On move 33 KomodoDragon's eval jumped over 2, AllieStein saw the danger a move too late. KomodoDragon captured a rook for a bishop, then created a supported passer on the king side. KomodoDragon attacked the black king with its queen and pawn, AllieStein 's counter against the white king was weak. AllieStein lost more material and was mated before long.
game 124, ScorpioNN - Ethereal: The white queen moved forward and grabbed a pawn early, evals were over 1 for a long time as the engines exchanged pieces. The game reached a BN vs BN position, ScorpioNN was a pawn up with a pawn majority on the queen side. In a series of exchanges the engines reduced to an opposite color bishops ending, white two pawns up. Unlike the usual case this position was a win for ScorpioNN.
game 125, AllieStein - Ethereal: AllieStein was a pawn up from the start. The engines exchanged pieces gradually, AllieStein created connected passers on the queen side and captured another pawn, Ethereal had an advanced passer in the center as compensation. AllieStein captured the black passer while Ethereal regained a pawn and captured one of the queen side passers. Ethereal reduced to an opposite color bishops ending, but soon regretted this since again it was a win for white. AllieStein was in no rush to finish the game, it took more than 60 moves to reach a tablebase win.
game 129, Leela - AllieStein: Leela created an advanced central passer early in the game, evals were under 1 and the engines gradually exchanged minor pieces. Leela gave a rook for a knight and moved its other rook to the 7th rank. AllieStein played a wrong rook move and lost a tempo, Leela's eval jumped over 2. AllieStein tried to expose the white king but its counter was weak. After exchanging queens Leela captured a pawn and connected a second passer. AllieStein could not stop the passers, mate followed a few moves later.
game 130, Stoofvlees - KomodoDragon: There were very few exchanges after the start, the pawn lines stabilized and the engines started to shuffle on move 30. Stoofvlees' eval was over 2, nothing happened for over 100 moves except a few exchanges and pawn moves. Suddenly KomodoDragon opened a file in the center and evals turned slightly negative. A few moves later Stoofvlees wasn't accurate and KomodoDragon's eval jumped over (negative) 2. Stoofvlees saw the danger too late, KomodoDragon reduced to a QN vs QR position and the black king couldn't escape mate. The first black win in the division.
game 133, AllieStein - Igel: Evals were under 1 for a long time with very few exchanges. Evals increased when the engines reduced to a BN vs NN position, AllieStein with a queen side passer. Igel moved its king and pieces to block the passer, AllieStein used the time to capture a pawn and create a second passer. After exchanging a bishop for a knight Igel capured one passer, but the black king was too far to help the king side pawns. AllieStein captured all black pawns and won the knight ending.
game 134, Stockfish - Ethereal: Evals started over 1 and slowly increased without exchanges, Stockfish pushed the black pieces back with its pawns. On move 31 the engines started to open the position with exchanges, leading to a RBN vs Q imbalance. Stockfish threatened the black king and Ethereal reduced to a RBN vs RN position. The black king was still in danger in the corner, Ethereal lost more material and the game reached a tablebase win.
game 140, Igel - Stockfish: Evals were over 1 from the start, the engines opened the position and evals increased. Igel gave a rook for a bishop and exposed the black king in a QRN vs QRR position. Stockfish's eval peaked over 2.5 while Igel's eval went over 4. When Igel exchanged a pair of rooks Stockfish's eval dropped to 0. Igel captured all the black pawns but after exchanging queens the game reached a tablebase draw. Perhaps a missed win for Igel.
Standings after RR5: Stockfish +11, Leela +10, KomodoDragon +7, Stoofvlees 0, AllieStein -2, ScorpioNN -6, Igel -7, Ethereal -13.
game 143, Ethereal - Leela: The game reached a BN vs BN position with white a pawn up. Ethereal's eval was over 2 and the engines shuffled. When the 50 move draw was close Ethereal exchanged knights, leaving opposite color bishops. Ethereal captured another pawn and resumed shuffling, giving 2 pawns back to continue the game. After extending the game with a pawn move on move 223, Ethereal's eval started to jump, reaching new highs while shuffling endlessly. The maximum eval was 237, very amusing for the viewers. Evals dropped to 0 as the 50-move mark approached and the game was adjudicated on move 265.
game 144, ScorpioNN - Stoofvlees: ScorpioNN captured a knight early in the game. Stoofvlees had an advanced central passer as compensation, and the white king was vulnerable. ScorpioNN kept its king safe, in a series of exchanges reduced to a QRR vs QRB position. The black king was left without support, mate was very quick. There were two white wins in this opening.
game 146, Stoofvlees - Ethereal: Evals were around 1 after the start, they increased slowly with almost no exchanges. The pawn lines stabilized and the engines mostly shuffled, until on move 52 Stoofvlees gave a pawn and opened the king side. Ethereal gave a bishop for another pawn, it had two passers on the king side, one on the 2nd rank. Stoofvlees captured one passer and exchanged rooks, after exchanging a pair of knights the game reached a BN vs N position. Ethereal was outnumbered, Stoofvlees captured all the black pawns and won.
game 147, Leela - Igel: Igel opened the queen side, then gave a rook for a knight, evals increased over 2. Leela exchanged pieces until only RN vs BB were left. Despite the black bishop pair in the open board Leela managed to capture a pawn and create a passer. Igel could have captured the rook for a bishop, probably it saw it was losing and let the rook go. The game continued for a while and ended in a tablebase win.
game 149, AllieStein - KomodoDragon: A long shuffle game. All pawns were on the board for a long time, AllieStein gave a pawn on move 111 to keep the game going. AllieStein wouldn't lower its eval, every 50 moves it found a way to extend the game. It finally gave up and allowed to game to be adjudicated on move 333.
game 154, ScorpioNN - Igel: ScorpioNN was up a pawn from the start with a queen side passer. There were many early exchanges and the game reached a RB vs RN position on move 29, white with connected passers on the queen side. ScorpioNN gave one passer and pushed the other to the 7th rank. Igel blocked with its knight, it took a while but ScorpioNN managed to capture all the black pawns. For a long time the engines shuffled, only on move 104 ScorpioNN started to push its second passer forward. Igel lost its rook and the game.
game 158, KomodoDragon - Stoofvlees: Evals started around 1, KomodoDragon pushed pawns on both sides of the board and the black pieces were mostly on the two back ranks. KomodoDragon broke through the center and its eval increased. KomodoDragon created a central passer and together with a bishop on e6 restricted the black pieces. The black king was in danger after KomodoDragon opened the king side and went two pawns up. Stoofvlees couldn't hold, it lost more material and was mated. KomodoDragon had a double win in this opening, the first one of the division.
game 159, Stockfish - ScorpioNN: Evals started around 1, Stockfish's eval increased after it pushed a pawn to g5. ScorpioNN's reaction weakened the black king's position on dark squares. On the queen side Stockfish created a passer supported by a bishop on d6. Stockfish went a pawn up, then in a series of exchanges the engines reduced to a queen ending. ScorpioNN saw it was losing, it gave up its queen and mate followed.
game 160, Igel - Ethereal: Igel pushed pawns and opened the king side. Evals increased as more pieces moved there, Igel doubled rooks on the g file. Then Igel pushed pawns in the center and Ethereal gave a knight to capture them, a series of exchanges reduced to a QNN vs QB position. Igel chased the black king across the board, then exchanged queens. A passer cost Ethereal its bishop, Igel had more than enough material to win.
game 166, Leela - ScorpioNN: Leela gave a knight early, but captured 3 pawns for it. There were many early exchanges and the game reached a QB vs QB position on move 26. Both kings were exposed, both engines had passers though the white ones were more advanced. Leela's eval was close to 0, but it jumped over 1 and then 2. Leela managed to move its king forward to support its pawns, then it reduced to a queen ending with a pawn up. ScorpioNN saw it was losing, it gave its queen and got mated.
game 168, Stockfish - Igel: Stockfish gave a knight for 3 pawns early, evals increased steadily as the engines exchanged pieces until only BB vs BNN were left. Igel tried to block the white pawns in the center, after a while Stockfish managed to get a pawn to the 7th rank. Igel started to lose material and mate followed.
Featured game: Stockfish - KomodoDragon
Premier division, game 120
Link to game on TCEC
Stockfish's eval was over 1 from the start, it slowly increased while
the engines played with almost no exchanges. The black pieces were
mostly stuck on the queen side, KomodoDragon played shuffle moves as it waited for Stockfish to take the initiative.
Stockfish pushed pawns on the king side, KomodoDragon gave a pawn and hid its king behind a white pawn. On move 33 the first minor pieces were exchanged, KomodoDragon had a trapped rook that could only escape by taking the h pawn and exposing its king.
Stockfish captured the black e pawn and opened a file in the center. By the time the black rook captured the h7 pawn and escaped, it turned out it was still trapped in a bigger room. Stockfish used doubled rooks in the open file to move a rook to the back rank.
Stockfish exchanged queens, KomodoDragon chose to give its trapped rook for a bishop and the game reached a RR vs RB position. Stockfish moved a second rook to the back rank and captured the remaining black pieces. It then mated a few moves later.
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