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If the computer was capable of evaluating every line of play right to the end of the game, the evaluation would never change. Indeed, the evaluation of every move would be either "win", "lose" or "draw". This is essentially what happens in endgame tablebases.* If computers could do this for every position, every game against a computer would consist of the ...
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On ubuntu, you can download Firefox, Chrome, or any other browser of your choice. From within that browser, go to lichess.org, chess.com, or chess24.com, create a free account, and play against others online.
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2018 update:
It seems lichess.org offers a lot of the features you're looking for. On lichess, go to tools then choose Analysis board:
The editor allows you to import FEN, PGN or edit the board yourself.
You have access to two proper opening databases, one extracted from the games played on lichess and one from the masters games (top players). It's not ...
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It's really hard to tell what a brilliancy is. For example, you might try to say that a brilliancy is a move that's much better than any other move on the board. Well, if you offer me a queen exchange and I play queen takes queen, you taking back my queen is probably a much better move than any alternative, but it's definitely not a brilliancy. So maybe a ...
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Yes, I think so.
You'd have all possible board positions as states (so lots of states, but finite).
The starting position as an initial state. Legal moves as links between the states (so the "alphabet" would consist of all possible moves). Positions that end the game like checkmate, stalemate and dead positions as accepting states.
In the end you'd get ...
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One of the problems with chess-analysis software for weaker players is that it just shows the strongest move per the computer, without any explanation why. There are some programs, like the ChessBase programs that, using their "Tactical Analysis" feature, attempt to give some explanation to the moves, but they are all wanting.
That said, decodechess.com ...
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Here's why computer analysis (on any platform) can not find brilliant moves.
They don't exist.
Now, I recognize that this seems very counter-intuitive, but bear with me. This has to do with the difference between how we (intuitively) view a chess game and how a computer (correctly) views a chess game.
When we look at a chess position, we subconsciously ...
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Finite state machines can be described as the recognizers of regular languages. You could perhaps identify chess with the set of all possible game records. For example f3e5g4Qh4# (the fool's mate) is one of the shorter strings in this language. Since this language has a finite alphabet and all words have bounded length (with the upper bound somewhere in the ...
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You can use the SVG rendering functionalities of python-chess. This will allow you to create a SVG-formatted visualisation of any board position loaded using python-chess.
FEN to SVG
For example, given a FEN as input (say we save our python script as boardtosvg.py)
Using python3 and the python-chess library version 0.30.1
import chess
import chess.svg
import ...
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8/3k4/2p5/p2p2p1/P2P2P1/2KB4/8/8 w - - 0 1
In this position the engine gives advantage of around +2.5, but as you can see, this position is a draw as there is no way for white king to enter into Black's side of the board to penetrate any of the black pawns as the black pawns control all the accessible squares which are b4, c4, e4, f4 and h4. Even though ...
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Right at the bottom of the Computer Chess Rating List for the 40/4 time control is Brutus RND, an engine that simply selects random legal moves.
http://www.computerchess.org.uk/ccrl/404/cgi/engine_details.cgi?print=Details&each_game=1&eng=Brutus%20RND#Brutus_RND
It has a rating of 205 (as of 6/6/2018). This is not a FIDE rating of course, but it is ...
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As thb pointed out, you need vectors. I suggest you use a python-chess to generate SVG vector images.
Prerequisites:
Python 2.6+ or 3.3+
Python-chess:
Install form pypi using pip: pip install python-chess[uci,gaviota]
Creating a script
Since you might need to generate multiple SVGs, let's create a script. So, you can use the script to generate multiple ...
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Original Answer:
7-men Lomonosov is free as an Android application.
Update - September 2018:
7-men Syzygy is available for free. Also available from Lichess.
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www.chessable.com just launched. This should be exactly what you are looking for. You can import pgns and can train the opening using space repetition.
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Tablebases are databases of endgame positions, with few pieces left on the board (say a 5-man tablebase, which consists of all legal positions with 5 pieces on the board in total, including kings, say K+Q vs. K+R+B). These databases have the positions 'connected', i.e. they also contain the moves to get from one legal position to another (in particular, ...
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You are being compared to perfection
Your every move is being evaluated by a chess engine with super-human playing-strength. The default is to compare your performance to its own super-human performance. Since the engine always makes the move it itself has identified as the highest-valued, perforce it always makes the best move by definition. Hence you can ...
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First download StockFish. You click on the button shown in the below image and choose "Save as". It will be saved as .rar file, which you can open with WinRar, 7Zip or similar utility...
Then you unzip it ( put it where you want ). After that run Fritz, and choose Engine -> Create UCI engine like in the picture below:
The following dialog box will pop up, ...
answered Aug 9 '14 at 18:56
AlwaysLearningNewStuff
11.6k2 gold badges24 silver badges55 bronze badges
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As of 2017.04.01, pgn-extract (version 17-38) does provide variation splitting functionality via its --splitvariants flag. So, if you want this in a Windows/Linux/Mac OS environment it is available. Disclosure: I am the author of pgn-extract.
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The best resource for chess engine programming is the Chess Programming Wiki, which has a large section on bitboards. Everything you need to make a bitboard-based engine is there, although it's rather spread out and sometimes written by people for whom English is a second language.
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Lichess.org has a free browser-based game analysis tool that allows you to copy and paste your PGN file for online analysis.
It's powered by Stockfish, and the analysis automatically:
Annotates the game with inaccuracies, mistakes, and blunders.
Graphs the game with an interactive move-by-move advantage chart (see below).
Suggests improved lines.
Names ...
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I just saw this example composed by Jim Plaskett:
[FEN "8/3P3k/n2K3p/2p3n1/1b4N1/2p1p1P1/8/3B4 w - - 0 1"]
It's a famous endgame problem.
I left Stockfish running for a few minutes and so far the best move it has found is 1.d8Q with an evaluation of -1.5. However this is not the best move.
The best move is 1.Nf6, which after a few minutes has an ...
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I know that I, for one, have used them to tell me why a line not mentioned in the books is bad. Most books show you all viable lines of play and maybe a few dubious ones, but a book can't mention all possible variations. More often than not, my opponent will play something very early on in an opening that isn't mentioned in any of the books I have on hand ...
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I happen to be the author of the chessboard editor under discussion. Let me clarify the issue.
This editor is supposed to enforce legal moves but it has a bug which prevents it from being able to make a pawn capture onto the final rank. Therefore it cannot notice that a black chessman controls the f1 square. If you place a black bishop on the a6-f1 diagonal ...
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may the game of chess be considered a finite state machine?
Yes; this is a good insight.
A FSM is an abstract model of computation with the following characteristics:
The machine begins in a known "start state"
The machine accepts a sequence of inputs
Each input is interpreted in the context of the current state
Each input causes an update to the current ...
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Lichess has an API which can also be used to download games. For example:
https://lichess.org/api/games/user/{username}?max=3&color=white
This will download 3 most recent games played by {username} with the white pieces.
You can find the docs for this operation (and others) here:
https://lichess.org/api#operation/apiGamesUser
The introduction page lists ...
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Programs like ChessBase, ChessPad, Scid vs. PC, and Lucas Chess all let you highlight squares & draw arrows on the board. You can then just record what you're doing using regular screen recording software like the excellent oCam.
Edit: I've created a video showing how to use Lucas Chess to create instructional chess videos. View it here. (YouTube)
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There're only two protocols - UCI and Winboard. Winboard is an old protocol and not really being used nowadays. Crafty is the only major engine still supporting the Winboard protocol, but it's only because the engine is also very old. UCI is a newer protocol developed by Shredder, and is used everywhere - Windows, Macs, Linux, Android, iOS etc. UCI is really ...
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Sort of (but not really) - and it's actually getting harder for engines to do this for you. To understand why, you have to understand how the evaluation goes. Engines typically can make snap evaluations on a given position, giving it a raw point value. Then, whatever the position is, they play forward, trying to find the line forward that optimizes that ...
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I think this picture describes the situation quite well. It was created from 400k games, and considers only plain piece material.
Source: Pawn Advantage, Win Percentage, and ELO
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Engines do use opening and endgame databases to help their play but that is only a small part of their strength. The strength of the engines come from what they do while they don't have a database move. The strength of engines come basically from two factors: evaluator and search.
The evaluator assigns a value to a position so that the search will know ...
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