Attacking Opposite Side Castling Chess!: Is the Najdorf underestimated? Andscacs vs Leela 11248

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Info about Leela Zero:


Leela Chess Zero (lc0) is a free, open-source, and neural network-based chess engine and distributed computing project.

Leela Zero’s algorithm is based on DeepMind’s 2017 paper about AlphaGo Zero.[3][6] Unlike the original Leela, which has a lot of human knowledge and heuristics programmed into it, Leela Zero only knows the basic rules and nothing more.[7]

Leela Zero is trained by a distributed effort, which is coordinated at the Leela Zero website. Members of the community provide computing resources by running the client, which generates self-play games and submits them to the server. The self-play games are used to train newer networks. Generally, over 500 clients have connected to the server to contribute resources.[7] The community has provided high quality code contributions as well.[7]

Leela Zero finished third at the BerryGenomics Cup World AI Go Tournament in Fuzhou, Fujian, China on 28 April 2018.[8]

Info about Alphazero:

AlphaZero is a computer program developed by the Alphabet-owned AI research company DeepMind, which uses an approach similar to AlphaGo Zero’s to master not just Go, but also chess and shogi. On December 5, 2017 the DeepMind team released a preprint introducing AlphaZero, which, within 24 hours, achieved a superhuman level of play in these three games by defeating world-champion programs, Stockfish, elmo, and the 3-day version of AlphaGo Zero, in each case making use of custom tensor processing units (TPUs) that the Google programs were optimized to make use of.[1] AlphaZero was trained solely via “self-play” using 5,000 first-generation TPUs to generate the games and 64 second-generation TPUs to train the neural networks, all in parallel, with no access to opening books or endgame tables. After just four hours of training, DeepMind estimated AlphaZero was playing at a higher Elo rating than Stockfish; after 9 hours of training, the algorithm decisively defeated Stockfish 8 in a time-controlled 100-game tournament (28 wins, 0 losses, and 72 draws).[1][2][3] The trained algorithm played on a single machine with four TPUs.


Relation to AlphaGo Zero
Further information: AlphaGo Zero
AlphaZero (AZ) is a more generalized variant of the AlphaGo Zero (AGZ) algorithm, and is able to play shogi and chess as well as Go. Differences between AZ and AGZ include:[1]

AZ has hard-coded rules for setting search hyperparameters.
The neural network is now updated continually.
Go (unlike Chess) is symmetric under certain reflections and rotations; AlphaGo Zero was programmed to take advantage of these symmetries. AlphaZero is not.
Chess can end in a draw unlike Go; therefore AlphaZero can take into account the possibility of a drawn game.
AlphaZero vs. Stockfish and elmo

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12 Comments

  1. I don't know how leela does this, it pushes its kingside pawns in some games, it damages its kingside pawn structure but still leela's king is safe and opponent king is in danger. Leela adopts everyone style like Petrosian in defense and tal in attack positional like botvinik Fischer Simultaneously in a single game. Its higher dimensional play and good positional understanding by leela

  2. Very simular scenario in these two games. Black is doing well

  3. The win at the end was because the connection went down at that point (14:50), and the game was adjudicated. The speculation is that Arena couldn't handle an underpromotion to a bishop.

  4. Leela is doing always pretty well and gets often the first attack going and also opposite colour bishops favours the attacker. Also the lightsquare bishop of white was pretty much hemmed in all game long till the end its like white played down a piece till the end.

  5. KC are you going to be going to the Championship match? its right in your back yard. You should do a few vids on site! or better yet live stream some commentary

  6. Wonderful positional play from Leela. Again a fine blend of aggression and defensive play. Thanks KC keep up the good work

  7. Leela never plays the Sicilian Dragon. That could be fun for everybody except her poor opponent of course.

  8. looool… "after some bureaucracy and form filling, the bishop can be taken"

  9. @8:23 what if instead of …Rc8, black plays …a3? white can't take since the pawn is pinned, and so b3 seems to be the best response. Leela then has a thorn pawn FAWN or can even open lines on the a file with a2. Unless I miss smthg .

  10. With all due respect KC, Andscacs opening was outright silly. On the surface it might appear avant garde and flexible, but in reality is provocative and weakening.

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