Standings after RR6
In RR5+6 the top3 engines beat the bottom5 in only 10/15 game pairs. Stoofvlees drew against Stockfish and KomodoDragon (double white win), ScorpioNN drew against Stockfish and Leela, and Igel also drew against Leela. All games within the top3 were drawn, and as a result the net effect is that KomodoDragon is 0.5 points closer to Stockfish, and Leela is 0.5 points further away from second place. There are still 14 rounds to play and anything may still happen in the top3, but it seems more an more likely that Leela will not be in the superfinal this season.
In the bottom 5 rofChade and Stoofvlees relatively improved their scores. rofChade had a double win against ScorpioNN and two more game pair wins. Curiosly all 6 games between rofChade and Stoofvlees so far have been wins for white. Igel continues to be last, ScorpioNN is closer to relegation after it crashed against Igel.
Interesting games
game 113, ScorpioNN - rofChade: The game reached a RB vs RB position, ScorpioNN was a pawn up with a king side passer while rofChade had a passer in the center. The engines traded pawns, ScorpioNN went two pawns up and cleared the black queen side pawns, thus creating 3 connected passers there. ScorpioNN was sure it was at least a little better and it blundered badly, rofChade's eval immediately jumped to "black win". The white king faced a mate threat, and ScorpioNN had to exchange bishops and give its rook for the black passer. There were 4 white passers but rofChade was on time to block them, the game ended in a tablebase win.game 114, KomodoDragon - SlowChess: Both kings remained uncastled in the center, evals increased as KomodoDragon attacked through the center with a queen and a knight. The black king ran to the queen side, after a series of exchanges only QBN vs QR remained. KomodoDragon exchanged queens and created an advanced passer on the king side. SlowChess lost its rook to stop the passer, game over.
game 116, Leela - Igel: The game reached a QBN vs QBN position, Leela's eval jumped on move 49, it thought it found something. Leela missed Igel's move 51, the white king was forced to run to the center of the board and Igel exchanged its knight for a bishop. Evals dropped, the game was adjudicated after the engines exchanged queens.
game 117, rofChade - Igel: The game reached a QB vs QN position, rofChade thought Igel's move 54 was a mistake and its eval jumped. After exchanging minor pieces the white queen was somehow better, perhaps the black king was more exposed. rofChade captured a pawn and created a central passer, then captured two more and created passers on the queen side. Igel captured 2 passers but had to give its queen to stop the third, game over.
game 121, KomodoDragon - rofChade: The engines castled in opposite directions, KomodoDragon was a pawn up with an eval advantage. Evals drifted down a little but then started to increase after move 30. rofChade tried to open the queen side without success, KomodoDragon controlled the open f file and threatened the black king. The game reached a QRB vs QRN position, the black king hid behind a white pawn. After a while KomodoDragon reduced to a B vs N ending, it captured a second pawn on the queen side. The black knight was helpless against flank passers on both sides, the game ended in a tablebase win.
game 123, Leela - SlowChess: Leela pushed pawns on the queen side, it gave a pawn and created an advanced passer. The engines reduced to a QRR vs QRR position, SlowChess gave back the the pawn to create central passers but it was focused on defense. Leela gave the queen side passer and pushed a pawn to e7, SlowChess blocked with its queen. Leela captured pawns and pushed a second passer to the 7th rank, the pressure was too great and SlowChess' defense crumbled with mate following.
game 128, KomodoDragon - Stoofvlees: Stoofvlees kept its king in the center while opening the king side. KomodoDragon's eval jumped, Stoofvlees thought it was OK and the engines played the moves it expected. On move 20 KomodoDragon captured a rook for a bishop and somehow Stoofvlees did not expect that. It thought for 16 minutes and finally its eval jumped as well. Perhaps it thought it had a strong counterattack, Stoofvlees gave more material and exposed the white king. However, nothing came out of the attack, KomodoDragon exposed the black king with a rook sacrifice and mated.
game 129, Stoofvlees - rofChade: The center was blocked, there were no exchanges in the first 32 moves except one pawn pair in the book sequence. rofChade did not castle its king, it walked to the king side making it difficult for the rook to develop. Evals kept increasing, rofChade gave a bishop for 3 pawns, also opening a file for the king side rook to move. Stoofvlees exchanged all rooks and then captured 4 pawns. After exchanging queens rofChade lost more material, the game ended in a tablebase win.
game 132, Stockfish - SlowChess: Stockfish opened the king side and captured a pawn, the black king remained without pawn support and SlowChess surrounded it with pieces. Stockfish went two pawns up, its king was also exposed but SlowChess could not spare pieces to attack. The engines exchanged pieces and mate was in the PV, Stockfish won material and chased the black king until mate.
game 133, rofChade - SlowChess: SlowChess opened the h file and rofChade's eval jumped, it thought that was a mistake. rofChade doubled rook and queen on the h file and threatened the black king, while SlowChess gave a rook for a bishop and pawn and created a queen side passer. rofChade switched to the queen side to block the passer, all other pawns were locked and rofChade waited for the right moment to attack. the white rook and queen moved to the 7th rank, SlowChess lost a piece and the passer, and mate followed.
game 135, KomodoDragon - Igel: There was a series of exchanges after the start, KomodoDragon thought Igel made a mistake on move 21. The game reached a QRB vs QRB position, KomodoDragon had a passer in the center and Igel had a passer on the queen side. Igel thought it was fine, it even went a pawn up but then it realized the white passer was too strong. Igel lost material to capture the passer, the game reached a winning R vs B ending.
game 137, Leela - rofChade: There were several early exchanges, evals increased slowly as Leela prepared its king side attack. Leela pushed pawns on the king side, then gave a rook for a bishop and pawn. rofChade hid its king behind a white pawn in a QRB vs QRR position. Leela cleared almost all the pawns on the queen side, then slowly pushed passers towards the black pieces and king. rofChade could not stop them and was soon mated.
Standings after RR5: KomodoDragon +13, Stockfish +12, Leela +9, rofChade -3, Stoofvlees -5, ScorpioNN -7, SlowChess -8, Igel -11. KomodoDragon and Stockfish were perfect as white against bottom5 engines in RR5, Leela missed one when it drew against Igel. ScorpioNN blundered a game as white again, this time against rofChade. It is likely that ScorpioNN will be deeper in the relegation zone after the reverse games.
game 141, rofChade - ScorpioNN: The game reached a rook ending with rofChade a pawn up. Evals were low and the engines reduced to a 7-man position. The engines shuffled for a long time and evals slowly came down, but on move 94 ScorpioNN blundered. rofChade reset the 50-move counter on time and found the win. rofChade won this opening from both sides.
game 148, KomodoDragon - ScorpioNN: The engines played out a long PV agreement, KomodoDragon gave a knight for a pawn and opened the king side. ScorpioNN's move 21 was not what KomodoDragon expected and its eval jumped immediately. The black queen moved to the queen side and was too far when KomodoDragon attacked the black king. After a series of exchanges ScorpioNN lost its queen, mate followed.
game 152, Stockfish - Igel: Queens were off in the book sequence, Evals started to increase on move 14. Igel moved its king early, Stockfish had a space advantage and it focused on the queen side. For a while it seemed the engines were shuffling, then on move 37 Igel gave a rook for a bishop and pawn. The game reached a RN vs BN position, Stockfish captured a pawn and then reduced to a winning N vs B ending.
game 153, Stockfish - rofChade: There were a few pawn exchanges after the start, Stockfish had an eval advantage that fluctuated but did not increase. The engines opened a file on the queen side and Stockfish pushed a pawn to h6. The first piece exchange was on move 32, in a series of exchanges rofChade gave a knight for 3 pawns including the white h6 pawn. Evals started to increase, Stockfish had only 2 pawns left, one of them a passer. It gave a knight and traded the passer for a rook, only RRN vs RB remained. With no pawns left Stockfish prepared its pieces, then exchanged the minor pieces and started capturing black pawns. The game ended in a tablebase win.
game 156, Stoofvlees - KomodoDragon: See featured game below. There were two white wins in this opening.
game 157, rofChade - Stoofvlees: Stoofvlees kept its king uncastled, with its king side rook and bishop unable to develop. rofChade opened the queen side and attacked, after a series of exchanges only RB vs RB remained. In the time it took Stoofvless to activate its pieces rofChade captured two pawns. The engines exchanged bishops, Stoofvlees got one pawn back and the game reached a 7-man tablebase position on move 71. rofChade had many occasions to capture the last black pawn and adjudicate the game, but it shuffled and repeated for 23 moves first. There were two white wins in this opening.
game 159, ScorpioNN - Igel: ScorpioNN had an eval advantage from the start but it crashed after move 14.
game 164, Leela - Stoofvlees: Leela went up a pawn early, the engines fought for control of the open center. Evals started to increase, and Leela captured a second pawn. After a series of exchanges only QN vs QB remained and Leela was 3 pawns up. The white passers slowly advanced, Stoofvlees captured some but lost its queen, mate followed.
game 166, Stoofvlees - Igel: Evals increased from the start, Igel moved its king early and there were very few exchanges. On move 25 Igel gave a rook for a bishop, the engines continues to exchange pieces until reaching a R vs B ending. All the pawns were isolated, Stoofvlees captured pawns until the game ended in a tablebase win.
Featured game: Stoofvlees - KomodoDragon
Premier division, game 156
Link to game on TCEC
KomodoDragon gave a rook for a knight and pawn early in the game. The black queen came forward on the exposed king side and captured a pawn, it looked intimidating facing the white king. Stoofvlees was not worried, it exchanged queens and kept its king safe even though it was exposed and in front of the white pieces.
Progress was slow, the black bishop pair was strong in the open board and KomodoDragon used them to target the white king and pieces. On move 64 Stoofvlees managed to exchange the knights.
It took Stoofvlees another 18 moves to capture the last black pawn, then it slowly pushed its passers. KomodoDragon could not stop a queening and the game ended in a tablebase win shortly after that.
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