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Now as in ProDeo YAT we want to enrich the 2 (above) Polyglot books (ProDeo.bin and DC.bin) further with the valuable data of CCRL 40/40 games played by high rated engines. For that purpose we have created 7 elo based polyglot books from the CCRL data, elo 3200, 3150, 3100, 3050, 3000, 2950 and 2900 and merged into ProDeo.bin and DC.bin. To clarify, the elo-3200 book only contains data from 3200+ rated engines, the elo-3150 book only contains data from 3200+ rated engines, etc. resulting in the following updates of the ProDeo.bin polyglot book.

It's important to carefully consider what book to use. If you have (want to use) a 3000+ elo rated engine and you take ProDeo-2900 as opening book that might turn out not so wise because it might play moves from 2900 rating engines also as book move. It makes more sense to use ProDeo-3100-3150-3200. A safefy margin of 100 elo is adviced although it's a educated wild guess. Only testing will tell.

Therefore, for top-engines (although not impossible) it will be much harder to profit from the CCRL data, for average and lower rated engine there is a lot to gain, funny enough, the weaker your engine the more gain there is.

The same (above) rules apply.

Remark regarding strength: It's reasonable to assume the ProDeo (CHT | EBF) approach will be somewhat superior to the Polyglot way of doing things as 1) they always pick the best move available from the available book moves while Polyglot picks a random move based on the "weight" value and 2) Polyglot opening books lack learning as I have understood.

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This is a do it yourself job. Select your favorite Chessbase | Fritz book and add the analysis work of Dann Corbit and Les Fernandez of 111 million positions to the *.CTG book.

The 111 million positions are split into 13 parts because Fritz has a PGN limitation of approx. 9.5 million games (positions) and thus after unzipping the download you will see 13 PGN files. The first 12 (dc.001.pgn - dc.012.pgn) contain each 9 million positions, dc.013.pgn 3.2 million.

Import each PGN to the loaded Fritz book (see the pictures), it will take about 15-30 minutes depending on your PC and you will notice that after each import the Fritz book has increased with approx. 1 Gb in size. This is no typo, if the job is done you will end up with an opening book of 13-14 Gb. Really...