Final standings
Berserk, Obsidian, Viridithas, Velvet and Arasan advance to league 1. Berserk and Obsidian lead from the start and only increased their lead. Berserk beat all other engines without a single loss, it won 18/22 game pairs. Obsidian lost twice to Berserk and once to Viridithas but won almost all other game pairs, only ScorpioNN held it to a draw in two game pairs.
The race for the other 3 qualifying spots involved several engines and continued until the final rounds. After the first DRR Viridithas had a small lead in third place with at least 5 engines fighting for two more spots. After the third RR Viridithas, Velvet and Arasan were together in third place with Stormphrax and Uralochka chasing. This group of 3 engines kept their lead in the fourth RR, ensuring their qualification in the final two rounds.
played in season 25 premier division: Igel
played in season 25 league 1: rofChade, Clover, Seer, Caissa, Revenge, Minic
Interesting games
game 7, Arasan - ScorpioNN: The black king was stuck in the center with both sides unsafe. Arasan gave a pawn and threatened to open the center. ScorpioNN traded pieces and reduced to a Q vs R position, which then took Arasan more than 30 moves to reach a tablebase win.
game 10, Berserk - Viridithas: Berserk was up a pawn from the start, the engines exchanged pieces until only QRN vs QRN were left. After some shuffling Viridithas started to play inaccurately, it cpatured white pawns but Berserk attacked the black king. After exchanging queens Berserk captured pawns until it was two pawns up, then slowly pushed a passer forward to win.
game 13, Obsidian - Arasan: The engines opened files on both sides and exchanged pieces until only QRB vs QRN were left. Arasan had a passer but it gave a pawn to defend its king, creating connected passers for Obsidian. After exchanging queens Obsidian managed to capture the remaining black pawns and the game ended in a tablebase win.
game 14, Uralochka - Ginkgo: Uralochka had a bishop pair advantage, the engines mostly shuffled behind their pawn lines for a long time though evals increased slowly. On move 46 the engines opened a file on the queen side and reduced to a BB vs NN position. Uralochka's bishops were strong, it used them to reduce to a winning B vs N ending 3 pawns up.
game 24, Obsidian - Uralochka: The engines opened the queen side, then slowly exchanged pieces until the game reached a BN vs BB position with white a pawn up. Afte r some shuffling the engines reduced to an opposite bishops ending and Obsidian captured a second pawn. Uralochka wasn't careful enough, Obsidian managed to move its king forward and created connected passers to win.
game 26, Viridithas - Obsidian: Queens were off early, the black king moved forward in the center. Viridithas opened the center and captured a pawn, the game reached a double rook ending. OBsidian pushed a passer forward, then gave its two rooks and queened the passer. Viridithas managed to capture all the black pawns and its 3 pawn advantage was enough to win.
game 39, BlackMarlin - Obsidian: The game reached a RRN vs RRN position, all pawns were on the board and the engines shuffled for a long time. On move 103 BlackMarlin gave a pawn, on move 158 Obsidian pushed a pawn, then it captured a second pawn and created a passer. On move 196 Obsidian pushed the passer, then BlackMarlin blundered and gave a rook for a knight and pawn. Obsidian now had connected passers, after another long shuffle Obsidian gave a pawn and opened a file. The engines traded pawns and Obsidian reduced to a winning rook ending.
game 48, Viridithas - Stormphrax: There were a few exchanges after the start and the engines mostly shuffled behind their pawn lines. Both kings moved to the king side, the white king side rook developed through the h file, while the black king side rook passively defended g7.On move 46 Viridithas created a passer after an inaccuracy by Stormphrax, then it gave a pawn and opened the queen side. Both engines pushed passers, Stormphrax developed its trapped rook. Eventually all passers were captured and the game reached a QR vs QN position. Viridithas pinned the black knight and then captured it for a pawn, the game ended in a tablebase win.
game 58, Uralochka - Velvet: The engines opened files on both sides, Uralocjka placed a knight on h6 and the black king ran to the center for safety. The game reached a QRN vs QRN position, Velvet gave a pawn to move the strong knight, Uralochka exchanged rooks and created a passer on the queen side. Velvet capture the passer and lost its knight, the game ended in a tablebase win.
game 63, Velvet - Viridithas: The engines opened the g file and blocked the center. Velvet walked its king to the queen side, gave a pawn and attacked the king side. Viridithas captured another pawn but its pieces were too far to help its king. Velvet traded pieces and gave pawns, but eventually it was mated.
game 64, DeepSjeng - Uralochka: DeepSjeng captured a pawn and created a passer on the queen side. Then it gave a knight for a pawn on the king side and pushed the passer forward. Uralochka lost a rook for the passer and the game reached a QRB vs QBN position. It took DeepSjeng some time to find a way to improve, after trading pawns the engines exchanged queens. DeepSjeng pushed pawns forward, trapped the black king and mated.
game 65, Berserk - Obsidian: Berserk pushed pawns on the king side, its king had no pawn support. The engines opened the queen side and traded a pair of pawns. Berserk controlled the b file, the black queen moved forward but could not attack on its own. Berserk exchanged the remaining rooks and attacked the black king, Obsidian lost a knight so its queen could get back. The game reached a QN vs Q ending, Obsidian lost the queen for a passer and was mated.
Standings after RR1: Obsidian Berserk +4, Viridithas Arasan +2, Uralochka +1, Ginkgo ScorpioNN Stormphrax Velvet -1, DeepSjeng -2 Marvin -3, BlackMarlin -4. Obsidian and Berserk are leading. Berserk has no loss and winning all games as white except one against Velvet, including a win against Obsidian. Obsidian has another loss against Viridithas, and a win as black against BlackMarlin. Viridithas, Arasan and Uralochka are in the race for two more qualifying spots.
game 69, Berserk - Uralochka: The engines opened the queen side, Berserk moved its rooks forward and Uralochka pushed a passer to the 3rd rank. Berserk captured the passer and another pawn, then gave a rook for a bishop and opened the king side. Uralochka gave back material to save its king, the game reached a RNN vs RBN position with white 3 pawns up. Berserk gained more material and mated.
game 71, Velvet - Stormphrax: There were only a few exchanges after the start, a few pawn exchnages opened the board and Velvet had a bishop pair advantage, both engines had a passer in the center. Velvet gave a rook for a knight and pawn, creating a passer on the queen side supported by its bishops. The game reached a RBB vs RRN position, Velvet then regained the material with a bishop fork. Velvet went two pawns up, Stormphrax lost the rook for a passer and the game ended just before mate.
game 80, Ginkgo - Uralochka: Ginkgo moved its queen forward and cleared the black pawns on the queen side. Then it gave a bishop and captured the remaining black pawns. Uralochka traded RR for Q and reduced to a Q vs RRB position with white 4 pawns up. It took Ginkgo many moves to push its pawns forward with its king support, but eventually Uralochka lost material and was mated.
game 85, Velvet - Arasan: Velvet created a passer in the center, the engines exchanged pieces and Velvet traded two minor pieces for a rook. The game reached a QR vs QBN position, Velvet created a second passer on the king side. After exchanging queens Arasan captured one passer but started to lose material. The game ended in a tablebase win.
game 107, Marvin - Velvet: The engines castled in opposite directions and pushed pawns facing the opponent's king. The game reached a RBN vs RBN position and Marvin went a pawn up. Both engines had a passer, after exchanging bishops and a pair of pawns Marvin connected a second passer. The game ended in a tablebase win.
game 109, Berserk - Arasan: Berserk gave 3 pawns and started a series of exchanges that resulted in a RRN vs Q imbalance. Arasan created two passers but its queen was a target for the white pieces, Berserk eventually got two pawns back. The black king was exposed, Berserk moved its pieces forward and Arasan lost material but couldn't avoid mate.
game 117, Uralochka - ScorpioNN: There were many early exchanges and the game reached a RBN vs RBN position with white a pawn up. After exchanging rooks both engines had a passer, it seems ScorpioNN was not accurate and evals started to increase. ScorpioNN reduced to an opposite color bishop ending, and even equalized material but Uralochka had connected passers that could not be stopped. The game ended in a tablebase win.
game 124, Velvet - Uralochka: Velvet captured an early pawn, the engines opened the king side and Uralochka exchanged queens. In a series of exchanges Uralochka gave a knight for pawns and the game reached a BBN vs BB position with black 2 pawns up. Uralochka pushed passes on the queen side, after trading minor pieces it took Velvet a long time to find the way forward. Eventually the last white pawn became an unstoppable passer, Velvet queened and mated.
game 125, ScorpioNN - Viridithas: Both engines castled long, Viridithas traded both its bishops for knights. ScorpioNN captured a pawn and created a passer on the queen side, then exchanged queens. The game reached a RBB vs RNN position, Viridithas captured the white passer but ScorpioNN went two pawns up and created connected passers on the king side. Viridithas lost a piece for the passers, the game ended in a tablebase win.
game 129, Viridithas - Velvet: Queens were off early and Viridithas went a pawn up. Velvet gave a rook for a bishop and pawn, cleared the white pawns on the queen side and created two passers. Viridithas created a passer on the king side in a RRN vs RBB position, it captured one passer and gave back the exchange. Velvet captured a passer but lost its bishop for another, the game ended in a tablebase win.
Standings after RR2: Berserk +9, Obsidian +6, Viridithas +3, Arasan +1, Velvet Uralochka 0, Stormphrax Ginkgo -1, ScorpioNN DeepSjeng -2, Marvin -5, BlackMarlin -8. Berserk and Obsidian increased their lead at the top, Berserk won 9/11 game pairs without loss ,Obsidian won 7/11 with two losses. Viridithas has a small lead in third place, fourth place is still very much contested. It appears that there are 5 qualifying spots at this stage, all engines have a chance other than Marvin and Blackmarlin.
game 137, Stormphrax - Velvet: Stormphrax went a pawn up, then the engines gradually exchanged pieces until the game reached a rook ending. Stormphrax had a passer in the center, it king moved forward to support it. The engines traded pawns, the game ended in a tablebase win.
game 142, Berserk - Viridithas: Berserk was a pawn down and its king had to move without castling, but it managed to capture a rook for a knight and the game reached a RRB vs RNN position. Both white rooks moved to the 7th rank, Viridithas exchanged rooks and Berserk captured all black pawns. Berserk had one pawn left, the engines continued playing a 7-man winning position for 20 more moves before adjudication.
game 145, Obsidian - Arasan: There were many exchanges after the start, the engines reduced to a RN vs R ending with black two pawns up with connected passers. Arasan was not accurate and Obsidian managed to capture one of the passers, then rook were exchanged. The game ended in a tablebase win.
game 156, Obsidian - Uralochka: Uralochka started a series of exchanges that ended in a RB vs Q position with white 3 pawns up. Both engines created passers and pushed them forward, Uralochka gave its queen for the white passer but queened its own passer. Obsidian pushed another passer slowly, there was a lot of shuffling but close to the 50 move draw Obsidian found the winning path. It gave its passer and captured the last black pawn, the black king became trapped and was mated.
game 159, Stormphrax - Ginkgo: The game reached a RB vs RB position with white a pawn up. Stormphrax had a pawn majority on the queen side, it attacked the black pawns on the king side and captured a second pawn. Ginkgo captured a pawn on the queen side but Stormphrax created connected passers on the king side to win.
game 164, Berserk - Velvet: Berserk captured a pawn, Queens were off early and the engines castled in opposite directions. The engines played with caution, Berserk created a passer in the center. Velvet lost a knight to capture the passer, the engines traded pawns until each had one pawn left. A series of exchanges reduced to a BN vs B position and the game ended in a tablebase win.
game 167, Obsidian - Stormphrax: Obsidian captured a pawn, the engines gradually exchanged pieces in a closed position. The game reached a BN vs BN position, Obsidian captured a second pawn and created a passer on the queen side. Stormphrax tried to block the board, all pawns were inaccessible to the bishops. It took Obsidian a long time but eventually it created a second passer and its king moved forward. Stormphrax lost material and the game ended in a tablebase win.
game 195, Velvet - Viridithas: Velvet pushed a pawn to h6 and castled long. The engines exchanged pieces and pawns, Viridithas captured the h6 pawn but the game reached a RB vs RN position with white a pawn up. Viridithas captured a passer and Velvet captured another pawn and created another passer. Velvet gave both pieces to queen the passer, then queened again and won.
game 196, DeepSjeng - Uralochka: The engines blocked the center and played behind their pawn lines, on move 32 DeepSjeng opened the king side and threatened the black king. Uralochka gave a rook for a knight, the engines exchanged pieces until only RR vs RB remained. DeepSjeng eventually created a passer and pushed it to the 7th rank. Uralochka traded rooks to capture the passer, in the R vs B ending DeepSjeng created connected passers, queened and mated.
game 197, Berserk - Obsidian: Obsidian went a pawn up and created doubled passers in the center. The engines shuffled and exchanged minor pieces, on move 63 the engines exchanged all rooks and reduced to a QBB vs QBN position. Berserk created a passer in the center, regained the pawn and exchanged queens. Obsidian lost the knight to capture the passer, Berserk slowly captured the remaining black pawns and the game ended in a tablebase win.
Standings after RR3: Berserk +14, Obsidian +9, Viridithas Arasan Velvet +2, Stormphrax +1, Uralochka 0, Ginkgo DeepSjeng -2, ScorpioNN -5, BlackMarlin -10, Marvin -11. Berserk and Obsidian increased their lead again, they will finish in the top two places. There are 5 engines fighting for the remaining 3 qualifying spots. Decisive games within this group may have dramatic effects on the final standings.
game 202, DeepSjeng - Viridithas: DeepSjeng had an advantage in a RB vs BN position, but only shuffled and couldn't find a way to win. After 50 moves it gave up the bishop and the game was adjudicated.
game 203, Velvet - Stormphrax: There were a few exchanges after the start, on move 32 Velvet gave a pawn and started to open the position. After a series of exchanges almost all pieces were gone and only BN vs B were left with black a pawn up. It took Velvet more than 30 moves to capture all the black pawns, the game ended in a tablebase win.
game 206, BlackMarlin - Velvet: There were almost no exchanges after the start, on move 34 BlackMarlin went a pawn up, the first piece exchange was on move 39. The engines gradually cleared the pieces from the board, on move 60 the game reached a same color bishops ending. BlackMarlin captured two more pawns and exchanged bishops, then queened a pawn and mated.
game 214, Berserk - Stormphrax: The center was blocked with most pieces on the king side. Berserk captured a pawn and created a passer on the queen side, while threatening the black king on th eking side. Stormphrax blocked the passer, Berserk captured a second pawn and reduced to a RRN vs RRN position. Stormphrax had to cover more passers, Berserk exchanged a pair of rooks and captured the remaining black pawns. The game ended in a tablebase win.
game 217, Velvet - Arasan: Arasan gave a pawn early, there were a few minor pieces trades. Then in a series of exchanges the engines reduced to a queen ending. Velvet created a passer, then got its king to a safe square. Arasan couldn't prevent a queening and was mated.
game 224, Obsidian - Viridithas: Viridithas captured a rook for a bishop, then gave back the exchange to get rid of a strong knight. The engines reduced to a BB vs BN position, Obsidian had a pawn majority on the king side and Viridithas gave a knight for two pawns to avoid a queening. Viridithas lost its bishop for the last white pawn, the game ended in a tablebase win.
game 234, Viridithas - Uralochka: Viridithas captured a pawn early, it had a pawn majority on the queen side. Uralochka opened the f file and placed its major pieces there. Viridithas created a passer on the queen side and pushed it to the 7th rank. There was some shuffling and Uralochka regained the pawn, then in a series of exchanges Uralochka got rid of the passer but lost a piece. The game reached a QRB vs QR position, Viridithas captured a pawn and the game ended in a tablebase win.
Standings with 5 rounds to go: Berserk +16, Obsidian +10, Velvet +3, Viridithas +2, Arasan +1, Uralochka Stormphrax 0, DeepSjeng -1, Ginkgo -2, ScorpioNN -6, BlackMarlin -10, Marvin -13. Velvet has a small lead in third place after beating Arasan and Stormphrax, though it lost to BlackMarlin. Viridithas in fourth also has good chances of advancing after beating Uralochka. A lot can still change in the last rounds.
game 241, Berserk - Arasan: The engines opened the queen side and Berserk captured a pawn. Arasan regained the pawn and the engines continued to exchange pieces until only RBB vs RBN remained. After some shuffling the engines traded bishops and cleared the queen side pawns. Berserk managed to capture all the black pawns and forced mate.
game 245, BlackMarlin - Uralochka: The engines castled in opposite directions, BlackMarlin opened the king side, Uralochka gave a rook for a knight and reduced to a RRN vs RBN position. Uralochka was a pawn up with connected passers on the king side, BlackMarlin captured a pawn and created a pawn majority on the queen side. BlackMarlin managed to capture the black passers for a knight and the game reached a R vs BN position with white two pawns up. BlackMarlin captured pawns and gave its rook for a bishop, Uralochka couldn't stop the white passers and was mated.
game 247, Arasan - Stormphrax: The engines traded Q for RB, Stormphrax thought it was fine for a long time. The black king had weak pawn support, the white rooks controlled the center. Stormphrax tried to attack with a rook sacrifice, after Arasan found safety for its king it gained more material and mated.
game 250, Obsidian - Velvet: The black queen moved forward early, both kings moved without castling. Velvet captured a pawn but its king and queen were exposed to attacks. Obsidian moved both rooks to the 7th rank, Velvet gave its queen and two pawns for the two rooks. The black king was still under threat, Velvet countered with its rooks against the white king. Eventually Velvet gave a rook for a bishop and reduced to a Q vs RN ending. Obsidian was two pawns up, it created connected passers and the game ended in a tablebase win.
Standings with 2 rounds to go: Berserk +17, Obsidian +12, Viridithas +3, Velvet +2, Arasan +1, Uralochka Stormphrax Ginkgo -1, DeepSjeng -2, ScorpioNN -6, BlackMarlin -11, Marvin -13. After their losses Uralochka and Stormphrax are close to being out of the race. Ginkgo is also only a point away from 5th place. However, with only two rounds left it is very likely that Arasan, Velvet and Viridithas will join the two leaders to qualify.
In round 43 all games were drawn except one, Berserk beat Ginkgo. As a result Viridithas and Velvet are safe, Ginkgo is out, Arasan still has a one point lead over Uralochka and Stormphrax.
In the last round Arasan drew and ensured 5th place. Uralochka won its last game but this only reduced the gap and was not enough to close it.
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