Standings after RR4
Stockfish and Leela are tied in the lead, both after only 3 game pair wins in the second DRR. Leela closed the gap after beating RubiChess in both games, Stockfish only drew against Stoofvlees after an unexpected loss when playing black. Berserk increased the gap from KomodoDragon after beating it in a game pair for the second time. At the bottom Seer beat Ethereal and is now in 5th place, RubiChess beat Seer but lost more games and dropped to 7th.
Interesting games
game 64, Leela - RubiChess: The black king moved without castling, RubiChess captured a pawn and created a passer on the queen side. Despite this Leela castled long and used the black pawns as shields for its king. RubiChess gave back the pawn and Leela slowly pushed pawns on the king side, driving away the black pieces until it created a passer on g6. After some preparation Leela captured a pawn and attacked from the queen side. RubiChess gave a rook for a bishop and the game reached a QR vs QB position. RubiChess captured the white pawns on the king side but Leela created two passers. After exchanging queens Leela queened a passer and mated.
game 70, Berserk - Ethereal: The engines castled in opposite directions and gradually exchanged pieces and pawns. Berserk traded a rook for a bishop and two pawns, the game reached a QBN vs QRB position and white had 3 connected passers on the queen side. Evals were stable until Ethereal gave a bishop for two pawns on move 51. Berserk still had one passer, after reducing to a BN vs R ending it pushed the passer forward while protecting its other remaining pawn as well. Ethereal couldn't prevent a queening and the game ended in a tablebase win.
game 72, RubiChess - Seer: There were no exchanges after the start, the center was blocked and the engines played behind their pawn lines. RubiChess' eval increased very slowly, on move 40 the first minor pieces wee exchanged. Seer gave a pawn and RubiChess created a passer on the king side, then the pieces shifted to the queen side. More pieces were exchanged and evals increased faster, Seer captured the passer and the game reached a RB vs RB position. The engines traded pawns and RubiChess created more passers. Seer couldn't prevent a queening and mate.
game 74, KomodoDragon - RubiChess: There were no exchanges after the start, the engines formed long pawn lines that blocked the center and king side. After some shuffling the engines exchanged a pair of bishops and opened the a file. KomodoDragon placed all its major pieces on the open file, then in a series of exchanges the engines traded Q for RBN. The white pieces threatened the black king and queen , RubiChess gave its queen for a rook and reduced to a BNN vs N position. RubiChess lost the knight for a passer, KomodoDragon queened another passer and mated.
game 77, Stockfish - Berserk: See featured game below.
Standings after RR3: Stockfish +8, Leela +7, Berserk +1, KomodoDragon 0, Seer -2, Ethereal RubiChess -3, Stoofvlees -8. This RR had more draws with only 8/28 decisive games. Both Stockfish and Leela drew a game in white against the other engines, though there was a black bias in Stockfish's game against Ethereal.
game 86, Berserk - RubiChess: The engines exchanged most minor pieces and blocked the center. RubiChess opened the king side and Berserk had a passer there. The game reached a RRB vs RRB position and evals started to increase. Berserk captured a pawn, RubiChess created a passer in the center. Berserk gave the passer and created another on the queen side, then exchanged a pair of rooks. The black king was in danger, RubiChess lost its bishop. The black passer was not strong enough and the game ended in mate.
game 92, RubiChess - Leela: Leela castled long even though the white queen had free access to d6. Then it curiously decided that its king should walk all the way back to the king side. Evals came down and the engines shuffled for a long time. On move 62 RubiChess captured a pawn and opened the center. Then in a series of exchanges the engines reduced to a Q vs RRN position with white 3 pawns up. RubiChess quickly captured 2 more pawns, it was 5 pawns up though two pairs were doubled. On move 77 RubiChess pushed a pawn and Leela's (negative) eval started to jump. The white pawns advanced but Leela began to capture them, it was only down two pawns with one black pawn left. Leela pushed its pawn forward and captured two more white pawns, then RubiChess lost its queen and the game ended in a tablebase win. Leela won this game pair from both sides.
game 93, Stockfish - RubiChess: The engines castled in opposite directions and the center was blocked. Stockfish opened the queen side and captured a pawn despite the fact that its king was exposed. Stockfish created a passer on the queen side, then in a series of exchanges RubiChess managed to capture the passer and trade a rook for two minors. RubiChess had a bishop pair but one of the bishops was in trapped in the corner by another white passer. The engines traded pawns and eventually RubiChess gave its trapped bishop for a passer. This created a new passer for white, Stockfish pushed it to the 7th rank and saw the win. RubiChess delayed with checks but eventually lost material and the game ended in a tablebase win.
game 94, Leela - Seer: There were only a few exchanges after the start, Leela pushed pawns forward and had more space. On move 42 Leela gave a pawn and through a series of exchanges created connected passers in the center. Seer had a blocked passer on the king side, after a while Seer gave a pawn and created a passer on the queen side. Leela captured one passer, Seer pushed the other to the 2nd rank and then gave a knight for the two white passers in the center. Leela captured the black passer, after exchanging queens Seer lost more material and was mated.
game 95, Berserk - KomodoDragon: Berserk was a pawn up from the start, there were many exchanges after the start including queens and KomodoDragon regained the pawn. The queen side pawns were mostly cleared, each engine had a passer there. The game reached a RBN vs RNN position, after some shuffling Berserk captured the black passer and KomodoDragon traded bishop for knight. After a long shuffle evals started to increase on move 105. The engines blitzed, Berserk managed to capture a pawn and created connected passers on the king side. KomodoDragon captured the queen side passer, but after the white king came to support the king side pawns were unstoppable. Berserk queened and mated.
game 97, Stoofvlees - Stockfish: Stoofvlees castled long and Stockfish moved its king to the king side without castling. The engines opened the queen side and exchanged queens, Stockfish gave a pawn and created a doubled white passer on the king side. Stockfish hid its king behind a passer and Stoofvlees trapped the king on the h file. The game reached a RBN vs RBN position, Stoofvlees captured pawns and exchanged knights. It was 4 pawns up with no black pawn left, after queening the game ended in a tablebase win. There were two white wins in this game pair.
game 101, Stockfish - Seer: There were only a few exchanges after the start, a pawn exchange opened the b file, then a knight exchange closed it back. Stockfish pushed pawns on the king side, after some shuffling evals started to increase. Stockfish moved a rook forward, the engines traded pawns and Seer created two passers on the queen side. Stockfish had a passer in the center, it captured a pawn and created a passer on the king side. The game reached a RB vs RB position, Stockfish captured more pawns and had a tripled pawn wall on the f file. The black king was trapped and the game ended in mate.
game 110, Seer - Ethereal: Ethereal had an isolated passer in the center, Seer pushed pawns on the king side and moved its king forward. After some shuffling the engines exchanged pieces and reduced to a rook ending with white a pawn up. Ethereal had a passer on the queen side and it moved its king there as support. Ethereal captured two pawns and pushed its passer to the 2nd rank but there it was stopped. Seer created a second passer on the queen side and Ethereal couldn't stop their advance, the game ended in a tablebase win.
Featured game: Stockfish - Berserk
game 77
The white queen moved forward on the king side and the black king moved without castling, trapping the king side rook. Stockfish moved both its rooks to the f file, after move 21 it gave two pawns on the king side while evals increased.
Both kings were exposed but the black king was under threat. After some preparation Stockfish exchanged a pair of rooks and saw the win in a QRB vs QNN position. Stockfish cleared the king side pawns, Berserk lost material and was mated.
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