Standings after RR6
Stockfish is still perfect with bias (usually as white, one game as black), it lost a game against Stoofvlees but drew the game pair. Leela had 4 game pair wins against the bottom5, it drew the game pair against KomodoDragon. KomodoDragon won 3 game pairs against the bottom5, its 3rd place is secure. Both Ethereal and RubiChess lost two game pairs against the top3, Ethereal won two game pairs while RubiChess won only one and lost one. As a result Ethereal is in 4th place 0.5 points ahead of RubiChess.
Interesting games
game 114, Ethereal - KomodoDragon: KomodoDragon was up a pawn but Ethereal developed its pieces faster. Ethereal gave a knight and attacked the black king, KomodoDragon exchanged queens and gave the piece back. Ethereal had an advanced passer and KomodoDragon gave a knight to stop it, the game reached a RBN vs RN position. The engines cleared the king side pawns, KomodoDragon tried to keep its pieces safe, Ethereal hunted the black king and mated.
game 121, Ethereal - Igel: Ethereal castled long and pushed pawns on the king side. Igel exchanged minor pieces and the game reached a QRR vs QRR position, Ethereal gave a pawn and opened files on the king side. Both the black king and queen became targets, Igel tried to exchange pieces but Ethereal managed to avoid this. Ethereal forced a rook for queen exchange, then Igel lost more material an dthe game ended just before mate.
game 122, Stockfish - SlowChess: There were many early exchanges that opened the center, material was equal but evals kept increasing. The game reached a RBN vs RBN position, SlowChess had two isolated pawns on the queen side and Stockfish captured both after a while. SlowChess gave a knight for a passer, it left another passer alone, I'm not sure why. SlowChess lost the bishop for the passer, Stockfish gained more material and mated.
game 125, Igel - RubiChess: There were no exchanges after the start, the engines formed long pawn lines in the center and king side. Igel's eval jumped after RubiChess opened the a file and Igel went a pawn up. All rooks were exchanged, then Igel closed the hole in its pawn wall with a bishop. RubiChess could only wait as Igel prepared its pieces. When it was ready Igel moved the bishop and a series of exchanges reduced to a BN vs BN position. The white king moved forward, after exchanging bishops Igel captured 3 more pawns. Igel queened a passer and mated.
game 129, Stockfish - Igel: Igel captured a pawn and the engines opened the queen side, Igel preferred to keep its king in the center. Stockfish opened files on the queen side and regained the pawn. It attacked the black king, then exchanged queens and captured two pawns. The game reached a double rook ending, Stockfish pushed two passers forward. Igel captured one and lost a rook for the other, game over.
game 130, Stoofvlees - Ethereal: The black king moved without castling and the king side rook couldn't develop. The engines opened the queen side and both engines created a passer there. Stoofvlees opened the king side and its major pieces threatened f7 and the black king. Ethereal gave the f pawn, Stoofvlees created two more passers and then captured the black passer. The engines reduced to a RB vs RB position, Ethereal stopped the white passers but lost material, the game ended in a tablebase win.
game 131, Leela - SlowChess: Leela was up a paws early, the engines reduced to a QRB vs QRN position. SlowChess regained the pawn but evals kept increasing. SlowChess couldn't defend against all threats and Leela captured a pawn, then created connected passers. Leela captured another pawn and exchanged queens, SlowChess captured a passer but lost its knight. The game ended in a tablebase win.
game 136, Stockfish - Stoofvlees: Stoofvlees gave a knight and attacked the white king, Stockfish gave material back to let its king escape to the center, leading to a BN vs R imbalance. The black queen moved forward and Stoofvlees pushed a passer, Stockfish gave 3 pawns and its queen moved forward to counter attack. Stockfish ignored the black passers and moved a rook to the back rank. It traded RB for Q and then chased the black king and mated.
game 137, Stoofvlees - Igel: Most minor pieces were exchanged early, the game reached a RRB vs RRN position. Stoofvlees had a passer on the queen side, Igel exchanged a pair of rooks and captured the passer but Stoofvlees created another. Stoofvlees captured a pawn and added a second passer, the white king moved forward and Igel couldn't prevent a queening. The game ended in a tablebase win.
Standings after RR5: Stockfish +16, Leela +7, KomodoDragon +2, Ethereal 0, RubiChess -1, Stoofvlees -3, Igel -8, SlowChess -13. Stockfish continues to be perfect with bias, it drew against RubiChess in white but in a black biased opening. Leela drew against RubiChess while KomodoDragon drew against SlowChess and lost against Ethereal. RubiChess had a weak RR with no wins and one loss, Ethereal is back in 4th place.
game 142, KomodoDragon - Ethereal: Ethereal was a pawn up while KomodoDragon had a development advantage. KomodoDragon castled long, most minors were exchanged and the game reached a QRN vs QRN position. KomodoDragon captured two pawns on the queen side and Ethereal finally castled its king. KomodoDragon slowly pushed passers forward keeping its king safe. Ethereal started to lose material and the game ended in a tablebase win. There were two white wins in this game pair.
game 143, RubiChess - Stockfish: Stockfish was a pawn up, (negative) evals started to increase after move 20. The game reached a RBN vs RBB position, RubiChess gave another pawn to weaken the black pawn structure, creating black doubled passers on the queen side. RubiChess captured 2 black pawns, then traded its rook for the black bishop pair. Ethereal a passer on both sides of the board, RubiChess captured one but lost its bishop. Stockfish queened the second passer and mated.
game 144, Leela - Stoofvlees: Evals were stable and slightly drifting down until move 30. The engines exchanged queens, the white bishop pair was very effective in the open board. Leela captured a pawn and reduced to a RBB vs RBN position, then it traded a pair of bishops and captured the last remaining black pawn. Stoofvlees couldn't stop the white passers, it lost material and the game ended in a tablebase win.
game 145, Leela - Igel: Leela castled long and opened the g file, Igel surrounded its king with pieces. Evals were drawish until move 32, the engines exchanged all rooks and evals started to increase. The game reached a QBN vs QBN position, Leela had a pawn majority on the queen side and the black pieces were far. Leela gave its two minor pieces and queened, after exchanging a pair of queens the game ended in a tablebase win.
game 147, Stockfish - KomodoDragon: The center was blocked, Stockfish pushed pawns on the king side and placed one on h6, trapping a black bishop in the corner. Stockfish castled short, There was a lot of shuffling on the queen side but evals increased very slowly. On move 41 the engines exchanged a pair of rooks, the first piece exchange of the game. For a long time Stockfish threatened the black b5 pawn while KomodoDragon defended it. On move 78 KomodoDragon decided to give its trapped bishop for a pawn, 10 moves later Stockfish finally captured the b5 pawn and created a passer. KomodoDragon blocked the passer but Stockfish captured more pawns. KomodoDragon lost more material, Stockfish queened and mated.
game 148, Ethereal - SlowChess: Ethereal pushed a pawn to h6 and trapped a black bishop. After a while Ethereal went a pawn up, then SlowChess gave another pawn and Ethereal had a passer. SlowChess exchanged its corner bishop and all rooks, it captured the h6 pawn but couldn't stop the white passer. Ethereal gave its queen for a knight and queened the passer, in a QBB vs QN position SlowChess lost more material, Ethereal queened again and mated.
game 151, KomodoDragon - Stoofvlees: Both engines castled long, exchanges opened the center. After a series of exchanges the game reached a rook ending with white a pawn up. Stoofvlees had 3 isolated pawns, eventually KomodoDragon captured one and reduced to a tablebase win.
game 155, Stoofvlees - SlowChess: Stoofvlees moved its queen forward on the king side, SlowChess gave a pawn to open the h file and castled long. SlowChess traded queens and gave a rook for a bishop, the game reached a RR vs RB position. Both engines still had 6 pawns and the rooks were limited, for a while the engines shuffled. On move 53 Stoofvlees managed to exchange a pair of pawns and open files, one rook moved to the back rank. Stoofvlees went a pawn up and created a passer, then reduced to a winning rook ending.
game 156, Stockfish - Ethereal: The g file was half open, Stockfish placed a rook there and castled long. There were no exchanges for a while and evals slowly increased, on move 40 Stockfish started to open the board. After a series of exchanges the game reached a B vs N ending with white two pawns up and a passer on the 7th rank. The white king moved forward, Ethereal captured one passer but couldn't block two more, Stockfish queened and mated.
game 158, Ethereal - Stoofvlees: There were many early exchanges and the game reached a RBN vs RBN position with black a pawn up. Evals were stable and drifted down, Ethereal moved its rook forward and regained the pawn. Stoofvlees created a passer and pushed it forward when Ethereal's eval jumped. Stofvlees moved instantly 3 times, when it stopped to think its eval jumped as well. Ethereal prepared a beautiful trap for the black rook, after exchanging rooks it captured the isolated black pawns. After capturing the black passer Ethereal pushed its own passers forward, it queened and mated. There were two white wins in this game pair.
game 160, KomodoDragon - RubiChess: There were only a few exchanges after the start and the engines shuffled for a long time. On move 81 KomodoDragon started to open the king side and evals increased. RubiChess captured a pawn and created a passer on the queen side but its king was in danger. KomodoDragon captured two pawns and created passers, then captured the black passer and reduced to a QRB vs QRB position. RubiChess lost material for white passers, then because of a mate threat and finally KomodoDragon mated.
game 161, KomodoDragon - Igel: There were only a few exchanges after the start, evals increased very slowly. On move 35 evals jumped, in a series of exchanges KomodoDragon opened the king side and attacked with its major pieces. The game reached a QRR vs QRR position and KomodoDragon captured two pawns, then reduced to a tablebase win.
game 162, RubiChess - SlowChess: The center was blocked and there were only a few exchanges after the start. The first pawns were exchanged on move 23. RubiChess managed to created an advanced passer in the center and then captured a pawn. The engines exchanged pieces and reduced to a rook ending. RubiChess connected a second passer in the center, SlowChess lost its rook and the game ended in a tablebase win.
game 163, Leela - Ethereal: There were only a few exchanges after the start, Ethereal doubled rook and queen on the half open g file and threatened the white king. Leela's eval jumped when it gave a bishop and trapped the black queen. Ethereal exchanged queens and lost a rook. The game reached a RR vs RN position, Leela had a passer on the king side and Ethereal created a passer on the queen side. Leela managed to stop the black passer on the 2nd rank, it used a mate threat to capture the black knight. The game ended in a tablebase win.
game 164, Stoofvlees - Stockfish: Stoofvlees opened the king side and captured a pawn. Stockfish exchanged queens and a pair of rooks, both kings were safe. The attention moved to the queen side, the engines cleared the pawns there. Stoofvlees captured another pawn and created a passer in the center. The game reached a RBN vs RBN position, the black king moved forward to block the king side. After exchanging bishops Stoofvlees trapped the black king on the h file and pushed passers in the center. Stockfish couldn't prevent a queening, the game ended in a tablebase win. There were two white wins in this game pair.
game 165, Igel - Stoofvlees: The engines exchanged minor pieces and the game reached a QRR vs QRR position. Igel went a pawn up, Stoofvlees captured two pawns back and the engines reduced to a rook ending. Despite being a pawn down the white passers were faster and Igel kept the black king away from them. Stoofvlees captured another pawn and pushed a passer to the 2nd rank, but it was not enough. Igel queened first and mated the exposed black king. There were two white wins in this game pair.
game 166, Stockfish - Leela: see featured game below.
Featured game: Stockfish - Leela
game 166
The black queen was out early, Leela avoided a queen exchange. Stockfish castled long, then used a knight to fork the black queen and capture a pawn. Leela tried to compensate by opening the long diagonal as a threat to the white king.
Evals slowly increased though the engines shuffled for a few moves. Then the engines played out a long PV agreement, Stockfish gave a rook for a bishop, the engines continued to exchange pieces until reaching a rook ending with white still a pawn up.
The white king moved forward to the center. After a while Stockfish exchanged pawns on the king side and created a passer. The white king captured the black pawns on the queen side, mate was in the PV when the game ended in a tablebase win.
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