Standings after RR6
Stockfish extended its lead, it had 4 game pair wins in DRR3. Leela is now in second place after struggling in the first two DRRs. In this DRR Leela had 3 game pair wins without loss, including a win against Integral that was in second place after DRR2. Integral had a poor DRR with two game pair losses and no win, quite unexpected after its results in the previous rounds. As a result Integral dropped to 4th place, Obsidian is now in 3rd. Leela opened a small gap, but we may still see an upset in the superfinal qualification, depending on the results of the last DRR.
Ethereal is alone at the bottom of the table after 3 game pair losses in the DRR. KomodoDragon was better than the previous DRR, it had two wins and two losses and got a bit closer to Berserk (one loss, no wins).
Interesting games
game 113, Leela - Berserk: There was one minor piece exchange after the start, Leela's eval increased quickly and went over 3. The engines played behind their pawn lines, there was a long shuffle and the white king walked to the queen side. Leela's eval peaked close to 5 and slowly drifted down. On move 87 Leela moved a pawn and reset the 50 move counter, the engines exchanged a few pieces and pawns and evals increased again. Leela captured a pawn and opened the a file, Berserk placed its major pieces there and threatened the white king. Leela defended its king and exchanged all rooks, the game reached a QN vs QB position. Berserk sacrificed the bishop for a pawn to create a passer, Leela pushed a pawn on the queen side and exchanged queens. The white passer was faster, Leela queened and mated.
game 115, Stockfish - Ethereal: The center was blocked, after a few minor piece exchanges the engines opened the g file and exchanged a pair of rooks. Stockfish sacrificed a knight for two pawns and reduced to a QB vs QBN position. The white king walked to the queen side, Stockfish captured another pawn and created connected passers. After exchanging queens Ethereal tried to control the white passers, it gave a bishop for a pawn and delayed for a while. Stockfish gave back the bishop for a pawn, Ethereal captured the white passers but the white king moved forward and captured two pawns on the queen side. Ethereal lost the knight for a passer, Stockfish queened another to win.
game 120, Leela - PlentyChess: PlentyChess was up a pawn but its queen side pieces developed slowly. PlentyChess created a passer on the queen side and the engines exchanged queens. After exchanging minor pieces PlentyChess connected a second passer, also creating a passer in the center for Leela. The game reached a RRB vs RRN position, PlentyChess captured the white passer and Leela captured one of the black passers. The engines exchanged a pair of rooks and Leela captured a pawn, creating a passer on the queen side. Leela pushed the passer and captured more pawns, after exchanging rooks Leela queened the passer and mated.
game 124, Obsidian - Ethereal: There were no exchanges after the start, on move 27 the engines exchanged minor pieces and a few moves later queens were exchanged. The first pawn exchange was on move 35, Ethereal created a passer in the center. In a series of exchanges the engines reduced to a RRB vs RBN position, Obsidian had a passer on the king side but the black passer was on the 3rd rank. Ethereal created a second passer on the queen side, Obsidian captured it and exchanged a pair of rooks. Obsidian captured the black passer and Ethereal captured 2 pawns, leaving an 8-man position with one pawn for each engine. In the slow endgame the white king moved forward and Obsidian pushed the passer. Obsidian gave the rook for the bishop, queened the passer and mated.
game 126, Integral - Obsidian: The center was blocked, Integral pushed pawns on the king side and castled its king, Obsidian pushed pawns on the queen side and kept its king in the center. The engines opened the b file and Obsidian moved a rook forward. The engines exchanged a pair of rooks and Obsidian moved the queen forward. Integral opened the g file and the engines exchanged queens, Integral moved its pieces to the king side and forced the black king to move away. In a series of exchanges Obsidian lost a minor piece and the game reached a RBN vs RB position. Integral captured the black pawns, Obsidian lost more material and was mated.
game 130, KomodoDragon - PlentyChess: The center was blocked, KomodoDragon pushed pawns on the queen side and formed a pawn diagonal line. The black light square bishop could not move and it blocked the rook development. PlentyChess pushed pawns on the king side, the white king walked to the queen side. The engines opened the g file and PlentyChess moved pieces forward on the king side. KomodoDragon traded its queen for a rook and a knight, then moved its pieces to the opening on the king side. PlentyChess managed to exchange its trapped bishop, but its other bishop blocked the rook. PlentyChess exchanged the second bishop and freed its rook, but KomodoDragon captured pawns on the queen side and created passers. PlentyChess lost the rook for a passer, lost the knight for another and mate followed.
game 131, Obsidian - Leela: The engines exchanged a pair of pawns on the queen side, Obsidian closed the pawn line with a bishop. After some shuffling a knight replaced the bishop, the engines exchanged a pair of knights. Leela attacked the center with another pawn exchange, evals started to increase slowly. On move 43 the engines started to play out a long PV agreement, Obsidian gave a rook for a bishop and the engines reduced to a QRB vs QRR position. Obsidian was a pawn up with a passer in the center, Leela couldn't get rid of the passer. After 25 moves Obsidian attacked the black king, Leela exchanged pieces and lost material. The game reached a rook ending with no black pawns, a win for Obsidian.
game 134, Leela - Ethereal: The engines opened the d file and exchanged minor pieces. Ethereal placed a rook on the open file, Leela pushed pawns on the king side and opened the h file. Ethereal gave a rook for a knight and pawn to threaten the exposed white king. Leela exchanged pieces and reduced to a RRB vs RNN position. The engines exchanged pawns and each had a passer on the queen side. Ethereal traded pawns on the king side, as a result all pawns there were gone and all pieces moved to the queen side. Leela improved very slowly, eventually it was able to push the passer and exchange rooks. Ethereal lost material for the passer, followed by mate.
game 135, PlentyChess - Obsidian: There were two pawn exchanges after the start, the engines opened the a file but only much later Obsidian moved a rook there. A knight exchange on move 30 created a white passer in the center. Obsidian moved pieces forward on the queen side while PlentyChess threatened the black king on the king side. After a few more piece exchanges PlentyChess captured a pawn and pushed a second passer to the 7th rank. Obsidian captured this passer but lost another pawn, the game reached a RB vs RB position. PlentyChess pushed passers forward, Obsidian lost the bishop but couldn't stop the passers. PlentyChess exchanged rooks, queened a passer and mated.
game 136, Stockfish - KomodoDragon: The center was blocked, Stockfish pushed pawns on the king side. KomodoDragon captured a pawn and created a passer, Stockfish moved pieces to the king side. KomodoDragon exchanged minor pieces, the white king hid behind the black passer. KomodoDragon tried to open the queen side, but instead lost two pawns and gave Stockfish passers. In a series of exchanges KomodoDragon lost a bishop for a pawn, Stockfish pushed passers forward and queened one, followed by mate.
Standings after RR5: Stockfish +9, Integral Leela +7, Obsidian +4, PlentyChess -2, Berserk -6, KomodoDragon -8, Ethereal -11. Stockfish keeps its small lead after two wins in RR5, with one draw as white against a low ranked engine. Integral had only one win, Leela managed to catch up with it after 3 wins in RR5 and despite a loss to Obsidian. At the bottom of the table Ethereal dropped down after 3 losses. KomodoDragon is a small step closer to Berserk but still facing relegation.
game 144, Obsidian - KomodoDragon: Obsidian castled long and KomodoDragon pushed pawns on the queen side. There were many piece exchanges after the start and the game reached a RRN vs RRN position on move 24. The engines exchanged pawns, KomodoDragon pushed two pawns in the center while Obsidian moved its rooks forward. KomodoDragon created an advanced passer and a white rook blocked it on the 2nd rank. KomodoDragon couldn't defend its passer, Obsidian captured it and exchanged a pair of rooks. Obsidian created a passer on the queen side and then captured a second pawn. After another pawn trade Obsidian pushed a passer forward and KomodoDragon couldn't avoid a queening and mate.
game 146, KomodoDragon - Ethereal: The white queen moved forward on the king side but Ethereal drove it back. KomodoDragon pushed pawns across the board, after a pawn exchange on the king side the black king walked back to the center. KomodoDragon exchanged a pair of rooks, captured a pawn and cleared the king side pawns. The game reached a RN vs RN position, KomodoDragon captured a second pawn and created a passer. Ethereal regained one pawn while the white king moved forward and KomodoDragon pushed the passer forward. Ethereal equalized material but lost the rook for the passer, KomodoDragon queened another and mated.
game 147, Stockfish - Integral: see featured game below.
game 154, Obsidian - Integral: Obsidian pushed pawns on the king side and Integral pushed pawns on the queen side. The engines castled their kings away from the opponent's advancing pawns. A pawn exchange opened the f file, another pawn exchange on the queen side didn't open a file but Integral created a passer on b3. Integral captured a pawn on the king side and created a passer, but it lost the queen side passer. The engines exchanged a pair of rooks, Integral moved a rook forward on the queen side and Obsidian moved the queen forward on the king side. Obsidian captured the black passer, it increased the pressure on the back ranks, created a passer on the king side and captured another pawn on the queen side. Obsidian managed to exchange queens and capture a bishop, Integral couldn't stop a queening, it lost more material and was mated. There were two white wins in this game pair.
game 159, Leela - Obsidian: The engines opened the c file, Obsidian moved a rook forward. Leela trapped the rook, Obsidian chose to trade the rook for a bishop and to activate its king side bishop. The engines exchanged minor pieces, Obsidian pushed pawns on the king side and its bishop became blocked again by its own pawns. Leela moved its major pieces to the king side, the h pawn became a passer. Then Leela shifted to the queen side, the white queen moved forward. Leela moved a rook forward and captured a pawn, creating a second passer. Obsidian lost material trying to defend its king, but was quickly mated. There were two white wins in this game pair.
game 162, Ethereal - Leela: Leela pushed pawns on the king side, Ethereal gave two pawns in the center and opened the e file. The white queen moved forward on the king side, after a series of exchanges the game reached a QRN vs QRB position on move 24. Ethereal regained one pawn, it tried for a long time to find the right way to attack. Leela avoided piece exchanges, after 30 moves Ethereal started to capture pawns. Ethereal was two pawns up with a passer when it exchanged rooks, Leela lost the bishop for another passer. Ethereal exchanged queens, queened a passer and mated. There were two white wins in this game pair.
game 163, Obsidian - PlentyChess: The engines opened the a file, after another pawn exchange Obsidian moved a rook forward. From move 22 the engines exchanged pieces and pawns, resulting in a N vs B ending on move 34. Obsidian was a pawn up with a passer on the queen side. Obsidian slowly pushed the passer forward to the 7th rank, PlentyChess did not take the passer to keep the white king away from the black pawns. After move 63 Obsidian captured the two black pawns, PlentyChess captured the passer on the queen side but couldn't avoid a queening and mate. There were two white wins in this game pair.
game 166, Stockfish - Obsidian: Stockfish pushed pawns on the king side, Obsidian opened the c file and moved a rook forward. Obsidian created a passer on the queen side, Stockfish gave a pawn and both engines created a passer in the center. After exchanging queens both engines pushed passers forward, Stockfish blocked the king side with a pawn on g6, trapping the black king. Stockfish captured one passer, Obsidian gave a bishop for the white passer. Obsidian lost control of the back rank, it lost more and more material and was mated.
game 167, PlentyChess - Ethereal: Evals were more or less stable as the engines exchanged pieces and pawns, even after Ethereal gave a rook for a bishop. The game reached a RR bs RB position, Ethereal exchanged a pair of rooks and PlentyChess' eval jumped. The 8-man position may have been a win, at least according to the Stockfish analysis that followed the game. However PlentyChess just shuffled and the game was adjudicated a draw close to the 50 move limit.
game 168, Leela - Integral: Evals increased quickly after the start. Leela pushed pawns on the king side and threatened the black king with a rook on h3, then captured a pawn on the queen side. The black pieces became passive, Integral gave a rook for a bishop to activate its queen. Leela pushed a pawn and created a passer on the queen side. An exchange of a pair of rooks connected a second white passer, Leela pushed the passers and Integral lost material. Leela trapped the black king and mated.
Featured game: Stockfish - Integral
game 147
After both engines castled the attention was on the queen side, both engines pushed pawns and there was one pawn exchange. After move 25 Stockfish shifted to the king side, it opened the h file and evals jumped. A minor piece exchange opened the d file, then Stockfish captured a rook for a bishop and pawn.
Stockfish moved a rook forward on the d file. A pawn exchange on the queen side created a passer for each engine. Integral gave the passer away and moved major pieces to the h file. Stockfish gave the passer back, exchanged rooks and took over the h file. The game reached a QR vs QB position, again each engine with a passer.
Integral tried to attack the white king but was not strong enough. Stockfish captured the black passer and pushed its own, Integral lost the bishop to stop it. Integral tried to protect its king, eventually it lost the queen and was mated.
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