superbatil,
Since I assume na alam mo yung purpose ng polyglot books, better start practicing how to make one or even improve existing one in your collection. Dalawa ang choice mo.
For a new polyglot book:
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(Yang huli, kung malinis yung pagkagawa, pwede mong i-reverse back to pgn using that tool. But it doesn't work perfectly especially on 32-bit system and needs a lot of RAM too. Marami pang ginagawa para makuha mo yung karamihan ng lines ng book. Yung karamihan like EchidnaX ay partial lang ang pgn na makukuha mo dahil malamang pinatungan yan ng isang gawang bin book (B+W) kaya mapuputol yung processing. yung lumang Cerebellum bin book ay kumpleto kapag ginamitan mo ng polyglot tolerant, pero yung bagong Cerebellum Merge book ay hindi na. Alam na ni Max he he kung kilala mo yung author ng Zipporoth/BrainFish.)
Pero bago ka makagawa ng polyglot nook ay dapat normalized/clean yang pgn database mo para error-free. Hindi lahat ng sources ay tama ang pgn format.
Kailangan mo ng pgn utilities to sort/clean your opening book game collections:
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(Kung may chessbase ka ay mainam din dahil kumpleto ang features nyan. Yung binigay ko ay usual tools pero maraming GUI na pwedeng gamitin like Arena, Lucachess, ChessX, Shredder Classic, Fritz atbp. na libre naman sa net. Isama nyo na rin yung Blundercheck option kung meron para maalis yung bad lines sa plies for White or Black. Ang alam ko, chessX at Arena ay meron din nyang feature. It takes a lot of practice and time to do this. Just read the manuals. This could give you an idea:
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Log in or register now. --simple chess games analyzer using stockfish of your choice
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Bahala ka na sa pgn game source collection at free naman yan sa net lalo pa sa lichess. Malaki lang talaga sa lichess dahil kasama pati evaluation ng moves sa games di tulad sa iba like pgnmentor or the like.)
For existing polyglot bin books:
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(Check mo dyan sa site ni Ed din yung past polyglot versions na gamit nya to be familiar with the changes, uses and features. Straightforward naman yung guide and easy to follow.)
Nandito yung full history nya sa baba at iba pang guides para di malito yung mga baguhan dahil ang dami niyang forks since na-release ni Fabien Letouzey yung original....modified ni Fonzy Bluemers...inayos ni Michel Van den Bergh na tinuloy ni Harm Geert Muller na two versions, na yung latest fork ay may learn feature. You need to read further to understand what I said from the link below.)
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Kung hirsp ka dyan, just use Scid or Scid vs. PC to tune your polyglot book:
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Yan din naman yung use ng bagong polyglot sa taas.
I'm just adding some ideas which most computerchess users don't normally tackle in this hobby. Retired na ako dyan kaya kayo na lang yung magpatuloy unless sasali kayo sa World Computerchess Tournament at itaas natin bandera ng Pilipinas he he. Madali kasing "mapaso" ang bin book kapag nilabas sa net, nahahanapan ng counter-attack yung laman ng bin. Yan mga malalakas na opening books na may tag na Don, CevDet, GOI, Cerebellum, Chucaro (new), Fauzi...(sa SedatChess) na nasa top 10 ng mga opening book tournaments ay halos pantay-pantay na sa ngayon. Kita naman sa stats dahil ang taas ng "draws" pagdating sa finals. Nagkakatalo na lang yan sa choices ng chess engine preferred/random opening start positions at after off-book na yung labanan (using the same engine). Book vs Book kasi yan. Pero sa "Engine vs. Engine", kailangan ay tuned din yung opening lines sa engine evaluation (especially sa white) all throughout the game and wish the other opponent (Black) has weak or even shorter lines from their book depending on the time frame of the game - and vice versa. White always has the advantage since he's the first to move kaya nga parating mataas ng statistical winning % percentage ng white sa black. Black should have the best lines to even white in the initial opening phase. Kailangan talaga ay perfect lines with new variations to catch your opponent off guard. Like humans, each unique engine has its weakness, pero kung minor "derivative" siya ay mahirap lokohin yung chess engine na halos parehas ang code nya. Sa opening book na lang magkakatalo yan in most cases. It will take thousands of games to see a difference. I could be wrong, pero yan yung experience ko after more than a decade of compiling/testing various versions of CE everyday.
PH