Standings after RR6
Stockfish increased its lead to 1.5 points after a perfect score of 7/7 game pair wins in DRR3. Leela is in second place after winning 6/7 game pairs. KomodoDragon is in third, already 3 points behind Leela, it lost to the two leaders and also drew one of the game pairs against the bottom 5.
The bottom 5 engines' standings seems to be stable with at least 1.5 points separating them. Ethereal is in 5th place after beating Stoofvlees, it closed the gap to Berserk by 0.5 points in DRR3 but with only one more DRR to play it is likely Berserk will finish 4th.
Also in DRR3: SlowChess won its first game pair, and there were no double win results in all game pairs.
Interesting games
game 117, Stockfish - Stoofvlees: Stoofvlees did not castle its king, and when Stockfish opened the f file the black king was stuck in the center. Stoofvlees captured two pawns and exposed the white king, Stockfish attacked quickly and Stoofvlees was too busy defending. The black king ran to the queen side, Stockfish moved queen and rook to the back rank, gained material and mated.
game 118, Ethereal - SlowChess: The engines castled in opposite directions, all pawns remained on the board and there were only a few minor piece exchanges after the start. Ethereal pushed pawns on the king side, one reached g6, its eval increased steadily. The first pawn exchange was on move 35, Ethereal opened the center and went a pawn up. In a QRB vs QRN position Ethereal captured another pawn, after exchanging queens Ethereal captured the knight. Ethereal gave material and reduced to a 7-man win, then played it for 30 more moves before adjudication.
game 119, Leela - Koivisto: Both engines castled long, most minor pieces were exchanged early and Leela went a pawn up with a passer in the center. Koivisto captured the passer and two more pawns but lost a bishop, the game reached a RN vs R position. Leela gave back the knight and reduced to a won rook ending.
game 120, KomodoDragon - Berserk: Exchanges opened both the b file and the f file, KomodoDragon already castled short and it placed a rook on each open file. Berserk chose to castle long, then tried to keep its king safe from attack. After a while all rooks were gone, the game reached a QNN vs QBN position with white a pawn up. KomodoDragon had a passer in the center that had to be watched, after exchanging queens KomodoDragon captured another pawn. The black king walked to the center, KomodoDragon exchanged a pair of knights and captured a third pawn on the queen side. Berserk couldn't block all the white passers advancing, game over.
game 125, Stockfish - Ethereal: Stockfish castled long and pushed pawns on the king side, Ethereal castled short anyway. Ethereal captured a pawn on the king side, another reached h6, the white queen moved forward on the queen side and regained the pawn. After a while Stockfish captured another pawn on the queen side and created connected passers. The game reached a RB vs RN position and Stockfish pushed a passer to the 7th rank. Ethereal gave its rook to capture the two white passers on the queen side, Stockfish created one on the king side to win.
game 126, Leela - Stoofvlees: Most minor pieces were exchanged early, evals were stable after the start. Leela delayed its castling, choosing to castle long in the end. Evals increased very slowly and the game reached a QRB vs QRN position. Both kings were exposed, for a while Leela hid its king behind a black passer. After Leela captured the passer Stoofvlees thought it was holding and its eval dropped, only to jump back up a few moves later. Leela cleared the center and threatened mate along the long diagonal. Stoofvlees gave a rook for a bishop to remove the threat, then was mated on the back rank.
game 127, KomodoDragon - SlowChess: KomodoDragon castled long and pushed pawns on the king side, SlowChess chose not to castle its king, there were holes in the pawn support on both sides. KomodoDragon gave a rook for a bishop and opened the d file, SlowChess gave the material back and tried to weaken the white king's defense. SlowChess was a pawn up in a QRB vs QRB position, however the black king was exposed. KomodoDragon used attacks on the black king and pieces to capture pawns and then reduced to a winning king and pawns ending.
game 133, Stockfish - Leela: see featured game below.
game 135, Berserk - Stoofvlees: There were many early exchanges and the game reached a QRN vs QRN position. Evals were stable though Berserk went a pawn up and then created a passer on the queen side. On move 39 Berserk's eval started to increase, it took Stoofvlees 5 moves and 9 minutes thinking to see the problem. Berserk pushed the passer to the 7th rank, Stoofvlees captured it but Berserk captured pawns on the king side and reduced to a queen ending two pawns up. The game ended in a tablebase win.
game 138, Stoofvlees - Koivisto: Stoofvlees was up a pawn with a passer on the queen side from the start, its king walked to the king side without castling. Koivisto regained the pawn but evals increased steadily. Stoofvlees gave a pawn and created a passer on the king side, after a series of exchanges the game reached a RBN vs RR position. Koivisto captured the passer on the king side, Stoofvlees pushed the one on the queen side to the 7th rank. After a while Stoofvlees exchanged a pair of rooks, Koivisto captured the passer but Stoofvlees captured the remaining black pawns for the knight. Stoofvlees was three pawns up in a B vs R ending, a 7-man win that was adjudicated 25 moves later.
game 140, Leela - KomodoDragon: There were a few exchanges after the start, Leela created an advanced passer in the center. Evals remained stable, pawn exchanges opened the board and by move 42 all the rooks were gone. On move 47 evals started to increase as the engines played out a PV agreement, the game reached a BBN vs BNN position. KomodoDragon was a pawn up but Leela had a bishop pair and the passer. KomodoDragon gave a knight to stop the passer on the 7rh rank, it captured all the white pawns but one. Leela kept its one pawn safe and gradually captured black pawns. The white pawn became a passer and the white king came forward to support it. Eventually both engines queened, Leela was first and it immediately mated.
Standings after RR5: Stockfish +13, Leela +11, KomodoDragon +7, Berserk +1, Ethereal -4, Stoofvlees -6, Koivisto -9, SlowChess -13. Stockfish beat Leela and Leela beat KomodoDragon, it should be interesting to see what happens in the reverse games. KomodoDragon only drew against Ethereal as white, there is little chance it can catch up to the leaders. There was almost no change in the bottom 5 with only 3/10 decisive games within this group.
game 141, Stockfish - KomodoDragon: The center was blocked, there was one minor piece exchange after the start and all pawns were on the board. Stockfish kept its king in the center while KomodoDragon walked its king to the queen side. After move 20 there were a few pawn exchanges, the a file opened and evals started to increase slowly. KomodoDragon moved its king back to the center, it went a pawn up after exchanging queens, creating a passer on the king side. The black king couldn't find a safe spot, it was almost trapped when Stockfish placed a knight on c6, KomodoDragon gave a knight for a pawn to get rid of it. In a RBB vs RN position Stockfish captured pawns, then queened a passer and reduced to a tablebase win.
game 142, Leela - Berserk: Leela's eval jumped on move 9, the engines exchanged all bishops and Leela pushed pawns in the center. Berserk went a pawn up and the white king was uncastled but Leela created a passer in the center. Berserk gave a rook for a knight to block the white passer's advance, the game reached a RRN vs RNN position. Berserk had connected passers on the king side but they were too slow, Leela pushed its passer and Berserk lost a knight to stop it. Leela captured pawns and promoted another passer (to a rook), game over.
game 144, Stoofvlees - SlowChess: Evals were stable with only a few minor piece exchanges after the start, on move 24 SlowChess went a pawn up yet evals started to increase slowly. The engines opened the queen side, the white pieces were more active, Stoofvlees tried to find a way to attack. Stoofvlees regained the pawn and exchanged a pair of rooks, after exchanging queens only RBB vs RBN were left. Stoofvlees pushed a passer to the 7th rank and SlowChess lost a knight to stop it. The engines traded pawns and a pair of bishops, then Stoofvlees promoted its last pawn to a rook and won.
game 149, Stockfish - Berserk: There were only a few exchanges after the start, the engines blocked the center and the queen side but there was an opening on the king side. Stockfish had a strong LS bishop and it also pushed a passer to h6, blocked by the black king. The white king walked to the queen side and Stockfish increased the pressure on the king side. Stockfish gave a pawn to disrupt the black pawn structure on the queen side, after some preparations the engines exchanged a few pieces including the white LS bishop. The game reached a RBN vs RBN position, Stockfish used the DS bishop to capture pawns on the queen side and created connected passers. Berserk couldn't stop the passers, Stockfish queened twice to win.
game 150, KomodoDragon - Koivisto: KomodoDragon kept its king in the center and pushed the g pawn towards the black king. Most minor pieces were exchanged and KomodoDragon moved its major pieces to the king side. Koivisto exchanged pieces to remove the danger to its king, the game reached a B vs N ending with white a pawn up. KomodoDragon traded pawns and reduced to a winning 7-man position, the game was adjudicated 25 moves later.
game 151, Leela - SlowChess: There were only a few exchanges after the start and Leela went a pawn up. Evals started to increase on move 23, the engines opened the g file and SlowChess tried to attack the white king. Leela exchanged pieces until only QN vs QB remained and for a long while the engines shuffled. On move 67 SlowChess moved a pawn and evals started to increase again. The shuffle could have continued but I am certain Leela would have found a way to improve eventually. Leela managed to create a passer, SlowChess captured it and exchanged the minor pieces. Leela created another passer and that was enough to win the queen ending.
game 152, Ethereal - Stoofvlees: Ethereal moved its queen forward and captured a pawn, its eval increased steadily while Stoofvlees' eval was stable. On move 25 Stoofvlees realized it was in trouble, it tried to attack the white king. Stoofvlees opened the king side but lost a knight, Ethereal kept its king safe and countered with an attack on the black king. Ethereal gave material back and mated on the back rank.
game 157, Stockfish - Koivisto: There were no exchanges after the start, the center was blocked and evals were stable. After move 20 a pair of pawns and a pair of minor pieces were traded, Stockfish created a passer on the king side and pushed it to the 6th rank. Evals started to increase, the white queen moved forward on the king side and the white rooks focused on the queen side. Stockfish moved its king forward to the king side and pushed the passer to the 7th rank, Koivisto gave a rook for a knight but the pressure continued to increase. Koivisto gave a knight for a pawn in desperation, Stockfish was up a rook. It captured all the black pieces, trapped the black king on the back rank and mated.
game 158, Berserk - SlowChess: The center was blocked and the engines castled in opposite directions. There were only a few exchanges after the start, on move 28 SlowChess gave a pawn to open the queen side. Evals increased slowly, all bishops were exchanged and Berserk moved its pieces to the king side while SlowChess focused on the queen side. After a series of exchanges the game reached a RNN vs RNN position, Berserk was a pawn up with passers in the center and the queen side. Berserk pushed a passer to the 7th ranked where it was captured, but Berserk captured a trapped knight. The game ended in a tablebase win.
game 159, KomodoDragon - Stoofvlees: The center was blocked and there were only a few exchanges after the start. The engines opened the a file and evals started to increase. Stoofvlees moved a rook forward on the queen side and was later joined by the black queen. KomodoDragon used minor pieces to trap the rook. Stoofvlees sacrificed a knight to expose the white king, KomodoDragon captured the black rook for a knight, the net effect of the exchanges was that KomodoDragon was up by a knight. Stoofvlees tried to threaten the white king, but its own king had to run forward as well. KomodoDragon gained material, Stoofvlees gave up and was mated quickly.
game 160, Leela - Ethereal: Leela's eval was high from the start, it was over 2 very early. The black queen move forward and the queen side opened, however Leela chose to castle long after the black queen moved away. Ethereal moved its king without castling, the white rooks were dominant in the open center files. There was a long series of exchanges in a long PV agreement that led to a QR vs RRN position. The engines traded pawns until each had one pawn left, Ethereal surrounded its king by pieces and tried to hold. Leela pushed its pawn safely to the 7th rank, eventually Ethereal gave a rook to stop it. This left a 7-man win that was played out for another 15 moves.
game 164, SlowChess - Koivisto: There were a few exchanges after the start, SlowChess had a space advantage. On move 24 evals started to increase. SlowChess gave two pawns and exposed its king, but it also threatened the black king that was almost trapped. Koivisto exchanged pieces and reduced to a RRN vs RNN position, its king still in danger. SlowChess created a passer on the queen side and pushed it to the 6th rank. Koivisto pushed its own passer to the 3rd rank, SlowChess gave a rook for a knight and stopped the black passer. SlowChess captured more black pawns, Koivisto lost material but couldn't stop a queening, game over.
game 165, Stockfish - SlowChess: Stockfish was up a pawn with a passer on the queen side from the start. Evals increased slowly as the engines traded pieces and pawns, then jumped after the queens were off the board. The game reached a RBN vs RBB position with black a pawn up, Stockfish traded its passer with a black passer and captured a bishop. The king side was blocked, Stockfish reduced to a knight vs pawns ending, both engines saw the mate 25 moves forward.
Featured game: Stockfish - Leela
game 133
There were a few exchanges after the start and evals were stable. The engines played out a long PV agreement that opened the center, by exchanging a pair of rooks Stockfish created and advanced passer on d6.
Stockfish captured a second pawn and reduced to an opposite color bishops ending. The black king guarded the passer on d6, protected by the white bishop. The white king moved forward on the queen side and captured more pawns. There was no way to prevent a queening and mate.
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