POLYGLOT OPENING BOOK

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The polyglot book format is the most wide spread format in use by chess engines. Since Polyglot opening books are made from PGN collections which may. under Linux and Mac OS using XBoard. PolyGlot provides a simplistic opening book implementation, referred as bin-opening book format. Polyglot is designed for computer chess engines, it sits nicely with engine code, but Most opening book makers use the Chessbase software.


Polyglot Opening Book

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Polyglot opening books. Here is a collection of polyglot opening books. What is Polyglot? Almost all chess engines support polyglot books. Generates chess opening books in polyglot format using imported PGN games and UCI engine analysis - jjoshua2/Polyglot-Book-Gen. What is a good source for free Polyglot .bin) opening books? Parent - By darmar Ask me everything. I made bin book strongest in the world.

Extension to other variants Polyglot does not support any Chess variants other than Mad Queen and Chess XBoard, however, does, and has extended the definition of the Polyglot book format to cover such variants.

To generalize to various board formats, it also numbers the board square in raster-scan fashion. The piece numbering is also extended beyond King, keeping the alternation of white and black pieces of the same type, to accomodate unorthodox piece types. How unorthodox pieces should be mapped on numbers is not yet subject to an official standard.

But variants that only the orthodox pieces e. Suicide, Atomic do not suffer from that. To map a piece, square combination to a hash key, however, only the square number modulo 64 and the piece number modulo 12 is used as index in the key table.

The square number divided by 64 and piece number divided by 12 is then used to decide how the retreived key should be bit-wise rotated to get the actual key. Square numbers in the range rotate the key left by 8 bits, while piece values in the ranges , and rotate left by an additional 16, 32 or 48 bits, respectively.

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This is sufficient to handle boards of upto squares, and up to 24 piece types. A number derived from the variant can be XORed to the overall key, to prevent positions from variants with equal board and piece types e. The table below defines the number that should be used for some common variants. Note that some variants that are mutually compatible use the same number, so that they can use the same opening book.

Crazyhouse, Shogi, S-Chess , the holdings are also part of the game state, and must be encoded in the key. To do this, the holdings are considered as a single off-board square with the next available number so square number 64 in Crazyhouse. The piece type, square number pair is than mapped onto a key in the same way as for on-board pieces. A complication here is that multiple pieces, possibly of the same type, can be on this 'holdings square', so that XORing the corresponding key into the total will not work.

Therefore the holdings keys are not XORed but added to the total key, after all other key terms have been taken into account through XOR.

For large boards this might leave a shortage of promotion types, but fortunately promotions are not very common in opening theory. The meaning of the promotionType code can be variant-dependent. Especially if there is a shortage of codes, the most common promotions should receive the lowest codes. So there is only room for 6 promotion types, while 7 would be needed for the 6 possible piece types and non-promotion. It means the percentage of analyzed positions.

Since Polyglot opening books are made from PGN collections the origins of the above books are not known, except for ProDeo, hence all positions are analyzed.

How to analyze a Polyglot opening book? The learning byte. The experienced reader immediately will realize the drawback of the system, one byte is much to small to handle large eng-eng matches with ten thousands of games.

In an ideal system the learning should function via a corresponding W L D file with 32 bit counters, maybe something for the future, but for the moment outside the scope of the project, sticking to the orginal Polyglot format. Nevertheless if you keep it small there will be immediate gain. Added 4 essential functions which allows the user to immediately make use of the new. Weights on score. Using this function basically emulates the results in table-1 above.

Option ' V ' variation based on the Stockfish scores will calculate new weights. Weights on learn. Using this function basically emulates the results in table-2 above.

Option ' V ' variation based on the learn scores will calculate new weights. Required tags: Preferable although not obliged tag: Check the new Polyglot weights with ProDeo 2.

Polyglot book format

Added 3 new powerful features with as goal - a dd elo to your Polyglot opening book. And with these new tools we created a stronger ProDeo book. It's best explained how the new created ProDeo book or any other Polyglot book is organized. First we have analyzed the ProDeo book with this tool using Stockfish 10 at 60 seconds per move, see table 1. Then with Merge Book we combined the 2 books.

Rodent Polyglot Opening Book

Table 2 is an example when the original ProDeo is out of book but then finds a lot of playable moves after all because of the CCRL games. The position is after -.

Nc3 g6 3.

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Bg2 O-O 5. Nf3 Nc6 7. O-O a6. Now we can see how the learn byte is organized when books are merged -. A value between and comes from the original ProDeo book and is sorted on depth table 1.

With these extra informations, for a user, a book can be better tuned with the Weights on score and Weights on learn functions and for a programmer to make better choices depending on the strength of his engine. The list of available options is detailed below.

It is cosmetic only. You can use different names for tweaked versions of the same engine. EngineDir default: ".

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You can use ". EngineCommand Put here the name of the engine executable file. You can also add command-line arguments. Path searching is used and the current directory will be "EngineDir". On Linux the EngineCommand is passed to wordexp so that shell quoting rules and expansions are applied.

On Windows the EngineCommand is simply passed to CreateProcess which does its own shell like processing.

Chess opening book (computers)

Log default: false Whether PolyGlot should log all transactions with the interface and the engine. This should be necessary only to locate problems.

LogFile default: polyglot. Note that it is put where PolyGlot was launched from, not into the engine directory. It is safe to remove them though. Resign default: false Set this to "true" if you want PolyGlot to resign on behalf of the engine. NOTE: Some engines display buggy scores from time to time although the best move is correct.

Use this option only if you know what you are doing e. ResignMoves default: 3 Number of consecutive moves with "resign" score see below before PolyGlot resigns for the engine. Positions with only one legal move are ignored. ResignScore default: This is the score in centipawns that will trigger resign "counting".

QueenNeverResigns default: true Suppresses resigning irrespective of the score, as long as the engine still has a Queen hoping for a perpetual. HandleDraws default: false When set Polyglot can accept draw offers on behalf of the engine, when the last reported engine score is below Polyglot's contempt.

ContemptScore default: 30 This is the score in centipawns that the engine must minimally see in its own disadvantage before Polyglot will accept a draw offer. ShowPonder default: true Show search information during engine pondering.

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Turning this off might be better for interactive use in some interfaces. ShowTbHits default: false Reports extra info on selective depth, search speed knps and tablebase hits at the beginning of the PV field in the thinking output of WinBoard protocol, just before the real PV.How to analyze a Polyglot opening book?

The Polyglot format is really a binary compression of position, moves, weights. They generally use Polyglot or nothing. EPD is created which is the base for the last step.

Main interest: However, the implementation in scidb is quite difficult to pull out not abstracted in software engineering terminology.

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