Standings after RR4
In the second DRR the top3 engines won 13/15 game pairs against the bottom 5, Stockfish and Leela had a perfect record, KomodoDragon drew twice. Together with the fact that Stockfish Beat KomodoDragon this explains why KomodoDragon is 1.5 points behind Leela and Stockfish is leading 0.5 points ahead of Leela.
Berserk is still safely in 4th place, with 3 game pair wins within the bottom 5. Ethereal and Stoofvlees improved their standings with positive scores within the bottom 5, Koivisto and SlowChess had negative scores within the bottom 5 and they are currently in the relegation zone.
Interesting games
game 61, Stockfish - Stoofvlees: Stockfish's eval increased from the start, it sacrificed a knight for two pawns and exposed the black king in the center. Stockfish then captured a rook for a bishop, the engines reduced to a RR vs RBN position with white 3 pawns up. After some preparations Stockfish exchanged a pair of rooks, then created passers on the king side. Stoofvlees captured one passer, Stockfish lost some material but queened another passer to win.
game 62, Ethereal - SlowChess: SlowChess was slow developing its king side pieces, Ethereal gave a rook for a bishop and created a passer on the queen side. By the time SlowChess castled its king Ethereal pushed the passer to the 7th rank and SlowChess had to use a rook to block. SlowChess gave back a rook for a bishop to capture the passer, Ethereal was two pawns up in a QRN vs QRB position. After exchanging queens Ethereal trapped the black king on the back rank and captured the remaining black pawns. The game ended in a tablebase win.
game 63, Leela - Koivisto: There were many minor piece exchanges after the start, both kings moved without castling. Evals increased quickly, Koivisto took longer to connect the rooks and Leela had a space advantage. After exchanging queens only RRN vs RRB remained, Leela gave a pawn and opened the king side. Leela placed a rook on the 7th rank and Koivisto tried to protect its king and pawns. Leela exchanged a pair of rooks and created advanced passers, Koivisto lost material and was mated.
game 68, Stoofvlees - Ethereal: Stoofvlees gave a pawn and hid its king behind a black pawn on h3. The king side opened, after a few minor piece exchanges Stoofvlees captured the black h pawn. The game reached a RRB vs RRB position, Stoofvlees controlled the open h file. On the queen side Stoofvlees created an advanced passer, after exchanging a pair of rooks it placed a rook on the 7th rank. Ethereal captured the passer while the white king moved forward. Stoofvlees went two pawns up and the game ended in a tablebase win.
game 69, Stockfish - Ethereal: Stockfish exchanged both its bishops for knights after the start and the engines castled in opposite directions. Evals were stable and the engines mostly shuffled for a while, on move 36 Stockfish traded Q for RR and evals increased a little. After some more shuffling Ethereal seemed to blunder and give Stockfish a pawn on move 57, Ethereal saw the problem 3 moves later and it gave a bishop to capture a passer. Stockfish reduced to a NN vs B position, it captured pawns, then queened and mated.
game 70, Leela - Stoofvlees: The engines castled in opposite directions and Leela opened a file in the center. Evals were high and increasing, Leela captured pawns and the queen side opened. Stoofvlees gave a rook for a bishop, its compensation for the material was an attack on the exposed white king. However, Leela kept its king safe, gave back material and reduced to a RN vs RB position. Leela was only a pawn up and Stoofvlees pushed a passer to the 2nd rank, but Leela queened a passer first, game over.
game 72, Berserk - Koivisto: There were no exchanges after the start, Berserk moved its king forward to the queen side without castling. The first pawn exchange was on move 22, a second opened the a file. On move 39 the engines exchanged a pair of rooks followed by a long shuffle. On move 82 Berserk moved a pawn on the king side and evals started to increase. Koivisto reacted with a knight sacrifice that exposed the white king and attacked. Berserk kept its king safe, after exchanging queens the attack was over. Koivisto tried to push a passer, Berserk captured the passer, gained more material and won.
game 78, KomodoDragon - Ethereal: There was one pawn exchange that opened a file in the center, other than that the engines mostly shuffled for a long time with stable evals. On move 39 the engines exchanged a pair of rooks, a minor piece exchange followed and evals started to increase. On move 57 KomodoDragon sacrificed a knight for two pawns and reduced to a BB vs BNN position. Ethereal did not have a DS bishop, this allowed KomodoDragon to capture two more pawns and create 4 connected passers on the queen side. Ethereal had to give material to stop the passers and was soon mated.
game 79, Berserk - Stoofvlees: There were many early exchanges and the game reached a QRR vs QRR position. Stoofvlees was a pawn up but its king was in the center and Berserk managed to place a pawn on e7 to trap it. Stoofvlees realized it was in trouble much too late, when it captured the e7 pawn Berserk pinned the black queen and captured it for a rook. Mate was a matter of time.
game 80, Koivisto - SlowChess: Evals increased quickly from the start, Koivisto controlled the open c file and its two bishops were strong in the center. SlowChess played waiting moves, Koivisto reduced to a QRR vs QRR position with the black king exposed. SlowChess lost its queen for a rook and its king was in a mating net, game over.
game 82, Stoofvlees - Koivisto: There were no exchanges after the start and the engines castled in opposite directions. Stoofvlees made an opening on the queen side with a pawn exchange, then doubled rooks facing the black king. After a few minor piece exchanges Koivisto captured a pawn and gave a knight for another pawn. After a series of exchanges the game reached a RN vs R position, Stoofvlees was patient and it managed to reduce to a winning rook ending.
game 83, Ethereal - Berserk: There was one exchange of a pair of bishops after the start, other than that the engines mostly shuffled. After move 32 a few pawn exchanges opened the queen side, Ethereal went a pawn up but evals were stable. Ethereal thought Berserk made a mistake on move 44, a few moves later Berserk's eval jumped as well. Ethereal gave a bishop and opened the king side, the black king ran and Ethereal captured a rook. The game reached a RN vs NN position, progress was slow and Ethereal shuffled a lot but eventually it captured a pawn and created a passer. Berserk couldn't stop the passer, the game ended in a tablebase win.
Standings after RR3: Leela Stockfish +6, KomodoDragon +5, Berserk +1, Stoofvlees -3, Koivisto Ethereal -4, SlowChess -7. KomodoDragon failed to win as white twice against a bottom5 engine, it is likely to stay in 3rd place after RR4 as well. Berserk is still firmly in 4th place though it lost to Ethereal. Stoofvlees beat both Ethereal and Koivisto, in the previous DRR it lost the reverse games, can it hold a draw this time?
game 85, Stockfish - KomodoDragon: see featured game below.
game 86, Leela - Berserk: For a while evals were stable, there were no piece exchanges after the start. Leela's eval started to increase after move 20, a series of exchanges reduced to a RRB vs RBB position. Leela created a passer on the queen side, the engines traded a pair of bishops and Berserk went a pawn up. Berserk blocked the white passer on the 6th rank, it tried to counter on the king side and created connected passers. Leela captured a pawn and created a second passer on the king side. A black passer was caught on the 2nd rank, Berserk couldn't stop the advancing white pawns and the game ended in a tablebase win.
game 87, Ethereal - Koivisto: The engines opened a file in the center with a pawn exchange, evals increased slowly though only a pair of rooks was exchanged until move 34. A series of exchanges reduced to a QBB vs QBN position with white a pawn up. Ethereal moved its queen to the 7th rank forcing Koivisto to defend. Both engines created passers, Ethereal hid its king behind a black pawn. After exchanging queens Ethereal captured the remaining black pawns, then used its passers to gain material and win.
game 88, Stoofvlees - SlowChess: An exchange half opened the g file yet the white king was safe from attack. SlowChess kept its king in the center, evals started to increase after Stoofvlees gave a pawn and further opened the queen side. After a few minor piece exchanges the g file opened, SlowChess finally decided to castle long and Stoofvlees regained the pawn. Stoofvlees moved a rook to the 7th rank, SlowChess gave a rook for a bishop and the game reached a R vs N ending. Stoofvlees pushed a passer forward, captured all the black pawns and the knight. The end was hilarious, SlowChess avoided a 6-man tablebase, Stoofvlees promoted 4 pawns - only the 4th to a queen - before forcing a tablebase win.
game 93, Stockfish - Berserk: The center was blocked, two pawn exchanges opened files on both sides. All pieces stayed on the board and evals increased slowly. On move 52 Stockfish captured a pawn and created a passer on the queen side. The engines started to exchange pieces while Stockfish pushed the passer forward, the game reached a RB vs BNN position. The white passer got to the 7th rank, Stockfish captured pawns and created two more passers. Berserk lost a bishop to stop one passer, Stockfish queened another to win.
game 94, KomodoDragon - Koivisto: KomodoDragon pushed pawns on the king side, its king was left without pawn support but evals increased slowly. KomodoDragon had a space advantage, for a while Koivisto played waiting moves and then exchanges opened a file in the center. KomodoDragon placed a knight on g6 and made threats on the g file, then in a QRN vs QRN position it created a supported passer on d6. KomodoDragon captured a pawn, then captured a black passer on the 3rd rank. Koivisto lost its knight for the white passer, KomodoDragon reduced to a winning king and pawns ending.
game 95, Leela - SlowChess: The engines castled in opposite directions, Leela thought SlowChess' move 13 was a blunder. Leela started an attack on the queen side slowly, moving its bishops out of the way and its king to the corner for safety. Then it exposed the black king, moved its queen forward and gave a rook for a knight. The black king was soon in a mating net, SlowChess gave material to delay and was soon mated.
game 96, Ethereal - Stoofvlees; The black king was stuck in the center, Ethereal gave a pawn and opened a file on the queen side. The white queen moved to the 7th rank with more pieces ready for an attack on the black king. Stoofvlees exchanged queens but still Ethereal had a rook on the 7th rank. Ethereal gave a rook for a bishop, only RBN vs RRB were left, still enough to chase the black king and mate. There were two white wins in this game pair.
game 101, Stockfish - Koivisto: Koivisto was a pawn up with the engines castled in opposite directions, but evals increased slowly. Stockfish pushed pawns on the king side with one reaching h6, Koivisto locked the pawn lines. Stockfish had strong bishops on the queen side, it gave a rook for a bishop and for a few moves it used pins and mate threats to arrange its pieces. A series of exchanges reduced to a RB vs N position. Koivisto had an advanced passer, Stockfish gave the bishop to capture it, it then gave the rook to queen a pawn and win.
game 102, Berserk - SlowChess: Berserk castled long, there were many exchanges after the start the opened the queen side and cleared most of the minor pieces. SlowChess castled short, Berserk was a pawn up, for a while the engines mostly shuffled as evals increased. Berserk captured another pawn and created connected passers on the queen side. Then Berserk reduced to a double rook ending and slowly pushed the passers forward supported by the white king. SlowChess lost both its rooks for the passers and was mated.
game 103, KomodoDragon - Stoofvlees: KomodoDragon castled long and pushed pawns on the king side. Stoofvlees had two knights there almost trapped, it decided to give one for a pawn and then castled short. Stoofvlees captured another pawn, giving the white major pieces more access to attack the black king. Stoofvlees tried to counter with threats on the white king but KomodoDragon was quicker, it gave a bishop and surrounded the black king with mate following.
game 104, Leela - Ethereal: The engines castled in opposite directions, the white queen moved forward on the king side. After a long series of exchanges the king side opened and only RRN vs RRN remained. There was a period of mostly shuffling and then Leela went a pawn up. Leela was very patient, first it exchanged a pair of rooks, then it created a passer with a pawn trade. Ethereal tried to delay and avoided piece exchanges, eventually Leela pushed the passer forward. It gave the rook and queened the passer, the game ended in a tablebase win.
game 109, Stockfish - SlowChess: The game started with the black king unable to castle after moving. Stockfish castled long, there were a few exchanges after the start and evals stayed stable. After opening the f file evals started to increase, the black king side rook was still stuck in the corner and SlowChess couldn't get it developed. Stockfish gave a pawn and focused its major pieces in the center. SlowChess freed its rook while Stockfish opened the center and moved a rook forward. Stockfish captured black pawns until there was only one left, SlowChess surrounded its king with pieces. Stockfish exchanged pieces until only B vs R remained with white 3 pawns up, a 7-man tablebase win that Stockfish continued to play for 35 more moves before adjudication.
game 111, Berserk - Ethereal: There were no exchanges after the start, the center was blocked, Ethereal castled long and Berserk walked its king to the king side. On move 28 Berserk gave a pawn on the king side, then the engines shuffled for a while. On move 41 Berserk regained the pawn and created a passer, evals started to increase. Berserk walked its king to the queen side, Ethereal started an attack with a bishop sacrifice. Ethereal managed to get two advanced passers facing the white king, Berserk defended its king and captured the passers, leaving it a rook for a knight up. Berserk pushed its passer slowly, Ethereal couldn't stop it and eventually Berserk gave a knight and queened, game over. There were two white wins in this game pair.
Featured game: Stockfish - KomodoDragon
game 85
Evals increased from the start, on the 3rd move after book Stockfish's eval was already over 2. Stockfish castled long and KomodoDragon moved its queen forward and captured a pawn. Stockfish used threats to the black queen to place a knight on d6, forcing the black king to move. Then Stockfish trapped and captured the black queen for a rook and a bishop.
KomodoDragon captured another pawn and was two pawns up, it also managed to trade and get rid of the knight on d6. However, the white queen found a way through on the king side. It moved forward and Stockfish cleared all the black pawns on the king side. The engines were down to two pawns each, all passers.
Stockfish exchanged a pair of rooks and the game reached a QB vs RBN position. KomodoDragon tried to keep its king safe and its pieces protected, but eventually Stockfish captured a bishop and mated followed.
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