Standings after RR6
In the third DRR the top3 beat the bottom5 in 12/15 game pairs, Stockfish drew against Ethereal and SlowChess, Leela drew against rofChade. Stockfish beat KomodoDragon for the third time, it is still in the lead extending the gap a little. KomodoDragon beat Leela and is very close to second place. Leela can't afford dropping games against the bottom5 or losses within the top3 if it wants a superfinal spot.
Within the bottom5 almost all game pairs were a draw, only Ethereal and SlowChess managed a game pair win against Berserk and Stoofvlees respectively. rofChade and Berserk are last 1.5 points behind the rest, they will probably be relegated.
Interesting games
game 114, Ethereal - Stoofvlees: The game started with a black bias in a variant of the KGA Schallop defense. There were no exchanges after the start, Stoofvlees moved its king without castling and pushed pawns on the king side. On move 26 there was a series of exchanges and queens were off. Evals remained stable, Ethereal gave a knight for two pawns and the engines reduced to a RB vs RBN position. Ethereal had a passer on the queen side and a rook on the back rank. On move 47 it blundered and evals immediately jumped, Stoofvlees managed to capture a pawn and was on time to give a rook for the passer. In the R vs BN ending Stoofvlees had one last pawn that ensured a win.
game 115, Stockfish - Berserk: After the start Stockfish captured a rook and later lost a knight. Stockfish castled long while Berserk kept its king in the center and evals started to increase. On move 25 Stockfish gave the material back and opened the king side. Queens were exchanged and Stockfish went a pawn up, then in a RBB vs RBB position it captured a second pawn and created a passer. Very slowly Stockfish pushed the passer forward, Berserk started to lose material and was mated.
game 116, Leela - KomodoDragon: See featured game below.
game 119, Stoofvlees - Stockfish: The game started with a black bias in a line of the English Symmetrical opening where black is up a rook and two pawns for a knight. Stockfish had connected passers on the queen side. Stoofvlees forced the black king to move to the king side without castling, Stockfish gave a rook to capture a forward knight. Stockfish couldn't develop its king side pieces, it even offered to give a rook for the white DS bishop but Stoofvlees refused. On the queen side Stockfish pushed a passer and captured a rook for it. Then Stockfish gave a bishop to develop its king side rook. In a QBN vs QRB position 3 pawns up Stockfish saw mate in its PV, game over.
game 122, Stockfish - rofChade: Stockfish played the opening better and evals started to increase. It pushed pawns on the king side and prepared an attack on the black king. Both kings were exposed but Stockfish was faster, it won material and reduced to a RRN vs RBN position. Progress was slow, it took 20 moves for Stockfish to capture a pawn and create a passer, then 20 moves more to mate.
game 123, Leela - Stoofvlees: The game started with a 2-ply Owen defense book, Leela played the opening better and evals increased. Stoofvlees gave a rook for a knight and pawn, it held on until move 25 when it captured a pawn. Evals immediately jumped and a few moves later Leela captured a knight. Stoofvlees managed to capture a bishop and stay close to equal material, but after exchanging queens the R vs B ending was a win for white.
game 124, KomodoDragon - Berserk: The engines castled in opposite directions, evals started to increase even though Berserk was a pawn up. The engines opened the f file and KomodoDragon attacked the black king. It captured a rook for a bishop while the black king hid behind a white pawn. The game reached a QRR vs QRB position, KomodoDragon had connected passers on the king side. After exchanging a pair of rooks Berserk captured a passer and lost its rook, KomodoDragon mated a few moves later.
game 129, Stockfish - SlowChess: The game reached a rook ending with Stockfish a pawn up on move 46. For 4 moves Stockfish's eval increased as it created a passer on the queen side. Its eval was close to 6 on move 50, then on move 51 Stockfish's eval dropped to 0 and the game was adjudicated a draw a few moves later. This is very unusual for Stockfish, there was plenty of time to think, what happened here?
game 130, Leela - Ethereal: Leela castled long and Ethereal kept its king in the center. Evals drifted down and it seemed the game was heading for a draw. On move 28 Ethereal diverged from the PV of both engines and evals jumped, why? Ethereal went a pawn up, Leela threatened the black king through an open h file. After many moves of back and forth between the king and queen side Leela managed to capture a pawn on the queen side on move 63 and it created connected passers. The engines exchanged queens, then Leela trapped and captured a bishop for a pawn. In a RBN vs RN position Ethereal couldn't prevent a queening and mate.
game 131, KomodoDragon - rofChade: The engines castled in opposite directions, evals were mostly stable as the engines exchanged pieces and the game reached a RRB vs RRB position. KomodoDragon had a passer on the queen side and evals started to increase. Using a pawn exchange KomodoDragon added a second passer, and it pushed them slowly with the support of its pieces. KomodoDragon gave a rook for a bishop, then captured a rook for a passer. rofChade couldn't stop the second passer, KomodoDragon queened and mated.
game 132, Berserk - Stoofvlees: The engines castled in opposite directions, Berserk pushed pawns on the king side facing the black king. Stoofvlees gave two pawns and opened the queen side, evals started to increase. Berserk captured a third pawn, then gave a rook for a knight and moved its queen to the back rank. Stoofvlees managed to regain 3 pawns, equalize material and reach a QR vs QR position. The white king was totally exposed but it found a safe square, the initiative returned to Berserk that continued to chase the black king and mate.
game 133, SlowChess - Stoofvlees: The game reached a RRB vs RRB position on move 28, with almost all pawns on the board. SlowChess created a passer in the center, Stoofvlees gave a pawn on the king side and hid its king behind a white pawn. Stoofvlees created passers on the king side yet evals started to increase. Both white and black passers reached the 6th rank, after a pawn trade more passers were created and all were racing forward. In the end all passers were caught, Stoofvlees lost a bishop in the process. The black king was trapped on the h file, SlowChess mated with its rooks.
game 135, Ethereal - KomodoDragon: The game started with a black a pawn up in the Slav defense, Geller gambit. There were many exchanges after the start, the game reached a RN vs RN position on move 31 with black a pawn up. Ethereal had a passer on the queen side, KomodoDragon captured a second pawn and created 3 passers on the king side. The engines exchanged knights and the game ended in a tablebase win.
game 137, Leela - SlowChess: SlowChess was up a pawn from the start, Leela forced the black king to move without castling. On move 21 Leela surprised SlowChess and evals jumped, Leela quickly opened the queen side and placed its major pieces there while SlowChess still had a trapped rook on the other side. SlowChess lost material, it managed to free its rook but was mated anyway.
game 140, Stoofvlees - rofChade: There were a few exchanges after the start, the a file was open but there were long pawn lines across the rest of the board. Evals went up and down, the engines mostly shuffled for long periods and the likely outcome was a draw. On move 84 evals jumped unexpectedly, Stoofvlees pushed a pawn and opened the position in a series of exchanges. The game reached a RBN vs RBN position, rofChade traded a trapped bishop for two pawns and the engines reduced to a RB vs R ending. Stoofvlees captured all the black pawns, the game ended in a tablebase win.
Standings after RR5: Stockfish +14, Leela +11, KomodoDragon +10, Ethereal -3, Stoofvlees -4, SlowChess -7, Berserk -9, rofChade -12. KomodoDragon beat Leela, it is still fighting for a place in the superfinal. Stockfish only managed a draw against SlowChess, only top3-bottom5 game with a hold against the bias.
game 142, Stoofvlees - Ethereal: The game quickly diverged from the reverse game 114. Stoofvlees had strong pawns in the center, Ethereal's (negative) eval increased fast though it was two pawns down and its king uncastled in the center. Stoofvlees thought its was fine, it gave two minors and opened the center, then captured a rook. Stoofvlees realized it was in trouble but it was too late. Ethereal captured a rook for a knight, the black king was exposed to attack but Ethereal managed to keep it safe despite the white queen and rook on the 7th rank. Ethereal exchanged pieces until only RN vs RBN remained, then gave a rook for a knight and queened a passer in the center. The game ended in mate. There were two black wins in this game pair.
game 145, KomodoDragon - SlowChess: Evals started to increase though the engines' PVs mostly agreed. The engines exchanged pieces until only QRN vs QRN remained on move 26. The engines exchanged queens and KomodoDragon moved its rook to the 7th rank. KomodoDragon went a pawn up, it had 3 connected passers on the king side and SlowChess had 2 passers on the queen side. KomodoDragon pushed the passers forward, it captured a rook for a knight and the game ended in a tablebase win.
game 146, Leela - Berserk: Pawns were locked in the center and king side, Leela moved its queen forward on the queen side. Evals increased as the engines exchanged queens and Leela created a pawn majority on the queen side. Leela castled late and moved both its rooks to the queen side to support the pawns. Leela then gave a knight for 3 pawns and created connected passers in the center. Berserk gave a bishop for one passer, the game reached a RRB vs RRB position with Leela two pawns up. Leela pushed two passers to the 7th rank, Berserk lost a rook for one and was soon mated.
game 154, KomodoDragon - Stoofvlees: The engines played out a long PV agreement that led to a RBN vs Q imbalance. The black queen moved forward and cleared the white queen side pawns, Stoofvlees was up two pawns. Evals increased after move 28, KomodoDragon played the complicated position better. The engines were down to one pawn each when KomodoDragon started to chase the black king. It traded RB for Q and reduced to a tablebase win.
game 160, Stoofvlees - Berserk: The engines castled in opposite directions, Stoofvlees pushed a pawn to h6. Evals increased slowly as the engines exchanged pieces, the black king walked out of the corner back to the center. In a series of exchanges the engines reduced to a knight ending. Stoofvlees used its king to trap the black knight, Berserk had to protect a pawn on the queen side and to stop any attempt to get behind the pawns on the king side. In a zugzwang Berserk gave the pawn, this freed its knight and it managed to capture two pawns. However, the white knight moved forward and the h6 pawn became a passer. The game ended in a tablebase win.
game 166, Stockfish - KomodoDragon: Evals increased from the start, after all pieces were developed a white bishop controlled the f8 square and KomodoDragon was forced to castle long. However, Stockfish moved its rooks to the queen side and KomodoDragon decided it would be better for its king to walk back to the king side. The black king was exposed, KomodoDragon gave a rook to remove a forward knight. After some shuffling Stockfish opened the queen side and went two pawns up in a QRB vs QBN position. Both engines saw the mate 15 moves in advance.
game 167, Ethereal - Berserk: Ethereal pushed pawns on the king side and Berserk kept its king in the center. Almost all pawns were on the board except for the open c file, evals started to increase in a short period of shuffling. Berserk felt its king was not safe, it walked to the king side while Ethereal opened the king side and went a pawn up. A series of exchanges reduced to a RNN vs RNN position, Ethereal captured a second pawn and pushed a passer on the king side. Eventually Berserk lost a knight for the passer, Berserk tried to hold but Ethereal started to chase the black king with its pieces. Berserk lost more material and the game ended in mate.
game 168, rofChade - Stoofvlees: rofChade castled long and Stoofvlees kept its king in the center. Stoofvlees didn't see move 17 coming, rofChade's eval jumped and it sacrificed a rook in the center. Stoofvlees saw its king was in danger and it did not capture the rook, rofChade put all its major pieces on the open d file. Stoofvlees tried to defend, it traded a pair of rooks but it was hopeless. The black king was soon in the open, rofChade chased it and mated. There were two white wins in this game pair.
Featured game: Leela - KomodoDragon
game 116
The game started with a black bias in a variant of the Vienna gambit. KomodoDragon went a pawn up but it had an unsupported forward pawn on c3. The engines developed pieces and castled in opposite directions, Leela captured the black pawn on c3 and equalized material. KomodoDragon's (negative) eval started to increase, the engines exchanged pieces until only RRB vs RRN remained.
The engines exchanged a pair of rooks and Leela's (negative) eval jumped. Leela pushed the d pawn and created connected passers in the center, this gave KomodoDragon a 3 vs 1 pawn majority on the queen side. Leela captured a pawn on the queen side and gave a rook for a knight to capture another.
KomodoDragon let the a pawn be captured but got rid of the white central passers. Leela protected its a pawn with the bishop, KomodoDragon used its rook to push the white king to the corner. Leela needed the bishop to control g6 and keep its king side pawns safe.
KomodoDragon chased the white bishop away, Leela tried to protect its passer and couldn't avoid KomodoDragon capturing the two pawns on the king side to win.
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