Scheduling note: I will be on vacation and will miss the final DRRs of the premier division. Based on the current results it is safe to say that Stockfish and Leela will be in the superfinal, even before the playoff is played. I haven't decided whether to try to complete the premier division entries when I come back (with a backlog of >100 games) or whether to cover the ongoing games and go back to ones I missed later... We'll see.
Standings after RR8
Stockfish drew as white against KomodoDragon, the first game it didn't win with bias. This was also only the 3rd game pair Stockfish didn't win after 28 played. Leela won 5 game pairs against the bottom 5, it drew against KomodoDragon and lost against Stockfish for the 3rd time. Ethereal and RubiChess both had 2 game pair wins and 2 losses, Ethereal keeps its slim lead in 4th place.
Interesting games
game 171, Stockfish - RubiChess: Stockfish opened the king side and RubiChess castled long. RubiChess gave a bishop for a pawn and exposed the white king, this led to a series of exchanges where the engines traded RN for Q. The engines reduced to a Q vs RN ending, evals were high but its still took a long time to convert. Stockfish had a passer and the white queen could give checks, pin pieces or threat forks. After 20 moves Stockfish created a second passer, RubiChess couldn't prevent a queening and then mate.
game 174, RubiChess - Stoofvlees: The center was blocked and there were only a few pawn exchanges after the start. Evals were stable, Stoofvlees offered a rook for a bishop but that would close a file and RubiChess refused. After move 35 evals started to increase, RubiChess opened the king side and created an advanced passer. Stoofvlees gave a knight for the passer, RubiChess captured a pawn and created connected passers in the center. Stoofvlees gave up when the white passers advanced, it gave material and was mated.
game 177, Ethereal - Igel: Ethereal castled long and gave a pawn on the king side. Ethereal slowly moved its major pieces to the king side, after the g file opened Ethereal gave another pawn and tripled its major pieces on the h file. Ethereal gave a rook for a knight and pawn and exposed the black king, Igel surrounded its king with pieces. Ethereal placed two static knights on the queen side while its queen and rook kept moving and making threats from all sides. Igel protected its king but it lost a few pawns, Ethereal created connected passers on the queen side. The passers slowly advanced supported by the white king, the game reached a N vs R ending. Igel lost the rook for a passer, Ethereal queened another and mated.
game 178, Stockfish - SlowChess: Stockfish captured a pawn early, the center was blocked and the engines formed long pawn lines without exchanges. Evals increased while the engines shuffled and the white king walked to the queen side. On move 48 Stockfish started to open the king side, it gave back the pawn and exposed the black king. After exchanging queens Stockfish captured a pawn and reduced to a RBN vs RBN position. Stockfish captured a second pawn and pushed connected passers forward, it gave a rook to promote to a queen and mate followed.
game 180, Leela - RubiChess: Leela moved its king to the king side without castling. All pieces were on the king side, Leela's eval jumped after RubiChess opened the f file. RubiChess gave a rook to get rid of a forward knight, Leela continued to exchange pieces until reaching a R vs N ending. Both engines pushed passers, RubiChess lost its knight, both engines queened but Leela was first and forced mate.
game 182, KomodoDragon - Leela: KomodoDragon castled long while Leela kept its king in the center. KomodoDragon captured an early pawn, the engines exchanged many pieces and pawns and Leela regained the pawn. The game reached a RN vs RB position, KomodoDragon kept the black king away and captured a pawn, reducing to a rook ending. The game continued for more than 25 moves, first KomodoDragon captured another pawn, then with 3 passers the engines reduced to a tablebase win.
game 185, Stockfish - Igel: Stockfish created a central passer with pawn exchanges, Igel captured a pawn but couldn't get rid of the white passer. Stockfish protected its passer with many pieces, after some preparations there was a series of exchanges that reduced to a RB vs RB position. Stockfish went two pawns up and pushed more passers forward. Igel lost its rook and the game ended in a tablebase win.
game 187, Leela - SlowChess: Evals were low until move 22, Leela thought SlowChess blundered on move 25. In a series of exchanges the engines reduced to a RB vs RN position, SlowChess was a pawn up but its pawns were vulnerable. Leela pushed a passer forward and SlowChess lost its knight for it. Leela captured pawns and pushed more passers forward, the game ended in a tablebase win.
game 188, RubiChess - KomodoDragon: Queens were off early, RubiChess went a pawn up and in an unusual sequence of exchanges the engines reduced to a RBN vs RNN position. After trading a bishop for a knight RubiChess created a passer. KomodoDragon lost more pawns trying to stop the passer, it gave up its pieces and the game ended in a tablebase win.
game 192, Stockfish - Stoofvlees: Stockfish gave a rook for a knight early and opened the king side. Evals were mostly stable, Stoofvlees exchanged pieces and protected its king. The game reached a QRB vs QRB position when Stockfish's eval jumped. Stockfish attacked the black king and captured a pawn, then reduced to a queen ending. Stockfish saw the win though it took more than 20 moves to reach a tablebase win.
game 196, KomodoDragon - SlowChess: There were no exchanges after the start but evals started to increase. On move 22 SlowChess opened the center and gave a knight for two pawns. The engines continued to exchange pieces and the game reached a QB vs Q position. KomodoDragon used checks to capture pawns, then exchanged queens. KomodoDragon didn't try to finish the game quickly, it took almost 40 more moves to get a tablebase win.
Standings after RR7: Stockfish +23, Leela +10, KomodoDragon +6, Ethereal 0, RubiChess -2, Stoofvlees -7, Igel -11, SlowChess -19. Stockfish and Leela continued to win as usual, except for Leela's loss to KomodoDragon. KomodoDragon also lost to RubiChess. Ethereal held a draw as black against RubiChess, it is still in 4th place.
game 200, Leela - Stoofvlees: Leela castled long and forced the black king to move without castling. Stoofvlees gave two pawns and opened the queen side, Leela gave a rook for a knight and exchanged pieces to keep its king safe. Leela was two pawns up, it pushed a passer to the 7th rank. Stoofvlees gave a bishop and captured the passer, Leela attacked the black king. Stoofvlees lost material and was mated.
game 201, Leela - Igel: All pieces were on the board until move 27 when Igel gave a rook for a knight. Igel pushed pawns on the king side and tried to attack the white king, Leela exchanged pieces and reduced to a RB vs RB position. Leela was a pawn up, both engines had passers but the white ones were faster. Leela queened a passer and mated.
game 202, Stoofvlees - RubiChess: There were no exchanges after the start, the engines blocked the center and queen side. On move 45 Stoofvlees opened the king side and RubiChess captured a pawn. RubiChess gave a rook for a knight and walked its king to the queen side. The engines exchanged minor pieces and opened files on the king side, then there was a long period of shuffling. On move 97 Stoofvlees moved its queen forward followed by a rook. After a while the engines exchanged queens and reduced to a RRB vs RBN position. Stoofvlees trapped and captured the black bishop, RubiChess gave two pawns in desperation and created a passer. Stoofvlees queened and mated. There were two white wins in this game pair.
game 204, Ethereal - SlowChess: There were no exchanges after the start, the center and queen side were blocked. Ethereal castled long and slowly prepared an attack on the king side. Evals slowly increased, there was one minor piece exchange and Ethereal pushed pawns on the king side. On move 58 Ethereal gave a knight for two pawns and exposed the black king. SlowChess tried to counter on the queen side but Ethereal hid its king behind a black pawn. SlowChess gave back a knight and surrounded its king with pieces, but it lost material and was mated.
game 205, Igel - Ethereal: Igel castled long, then gave a pawn and opened the king side. After exchanging a pair of rooks Igel regained the pawn on the queen side and created a passer. Ethereal had a passer on the king side, the engines shuffled for a while, then reduced to a NN vs BN position. The black bishop was blocked by its own pawns, Ethereal gave it and captured a pawn. Igel used one knight to block the black passer, the other knight captured pawns until there were none left. The game ended in a tablebase win. There were two white wins in this game pair.
game 209, RubiChess - Igel: There were many early exchanges, the game reached a QRN vs QRN position with white a pawn up. After exchanging rooks RubiChess managed to capture a second pawn and created a passer. RubiChess pushed the passer forward and Igel lost the knight for it. The game ended in a tablebase win.
game 210, Leela - KomodoDragon: Leela castled long and KomodoDragon tried to open the queen side. Leela went a pawn up and exchanged pieces to keep its king safe. The game reached a RB vs RB position, both engines had a passer a square away from promotion. KomodoDragon had to abandon its passer, Leela pushed a second passer forward and forced a queening and mate. There were two white wins in this game pair.
game 211, Stoofvlees - SlowChess: The engines castled in opposite directions and both pushed pawns facing the opponent's king. Evals started to increase when Stoofvlees gave a knight for two pawns and opened the king side. SlowChess gave a bishop back to let its queen move forward, then queens were exchanged. Stoofvlees doubled rooks on the g file, then captured pawns until it was a pawn up with passers on both sides. The engines reduced to an opposite color bishops ending, Stoofvlees captured two more pawns and that was enough for a tablebase win.
game 212, Stockfish - Ethereal: The engines castled in opposite directions, there were many early exchanges and Stockfish managed to place a pawn on f6. The game reached a double rook ending with white a pawn up, the black king was restricted on the king side. Ethereal managed to capture the f6 pawn and then exchanged a pair of rooks. Both engines had 3 passers, the white ones were connected. That was enough for Stockfish to queen a passer first and force mate.
game 214, Ethereal - Stoofvlees: Stoofvlees gave a pawn early and opened the queen side. The white king was stuck in the center, Stoofvlees gave a knight for a pawn and opened the d file where it doubled queen and a rook. Ethereal was not intimidated, it kept its king safe even when the second black rook moved forward. Ethereal moved its rooks to the 7th rank and attacked the black king. Stoofvlees tried to exchange pieces but it was soon mated.
game 216, KomodoDragon - RubiChess: Evals were stable for a long time, with only a few exchanges. After move 35 KomodoDragon's eval started to increase, it half opened the g file and put all its major pieces there to threaten the black king. RubiChess lost a knight, after a while the engines reduced to a RB vs R position. RubiChess was two pawns up with connected passers, KomodoDragon pushed a passer forward and the black rook had to block it. The white king captured the black passers, KomodoDragon queened and the game ended in a tablebase win. There were two white wins in this game pair.
game 217, KomodoDragon - Igel: KomodoDragon gave a pawn early, after Igel castled KomodoDragon attacked the king side and exchanged DS bishops. Igel's king side was weak on the dark squares, KomodoDragon regained the pawn and attacked with its major pieces. The game reached a QRB vs QRB position with a white passer on the 7th rank. KomodoDragon captured two pawns and after a while reduced to a same colored bishops ending. A combination of a light squared bishop and pawns on dark squares kept the black king away, KomodoDragon queened a passer and mated.
game 218, RubiChess - SlowChess: The center and queen side were blocked, the engines shuffled and SlowChess walked its king to the queen side. RubiChess' eval started to increase on move 30, in a series of exchanges SlowChess gave a bishop for two pawns and the king side opened. The game reached a RRB vs RR position, RubiChess captured pawns and exchanged a pair of rooks, then it captured the last black pawn and the game ended in a tablebase win.
game 219, Leela - Ethereal: Leela's eval jumped after Ethereal grabbed a pawn on the queen side, Leela opened the h file and threatened the black king. Ethereal placed all its major pieces on the b file as a counter attack, Leela castled its king and kept it safe. Leela gave a second pawn and opened a file in the center, the threat to the black king forced Ethereal to give its queen and the game reached a QRN vs RRB position. Ethereal tried to move its king away, Leela pushed a passer forward. Leela gave a rook and queened, then gave away the material and reduced to a tablebase win.
game 222, Stockfish - Leela: see featured game below.
Featured game: Stockfish - Leela
game 222
After the start the engines opened the b file, Stockfish thought that Leela castled its king too soon. Then Leela half opened the f file and gave a rook for a knight, Stockfish's eval jumped yet Leela's eval was still stable. Stockfish surprised Leela on move 21, after two moves without thinking Leela spent 4 minutes to consider its reply and its eval also jumped.
The white king only had a knight as cover but Leela could not attack it. Stockfish quickly captured a pawn and created a passer. After exchanging rooks Stockfish attacked the black king and captured two more pawns. The white passers advanced and Leela lost its queen, the game ended in a tablebase win.
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