pbchess is a Games & Entertainment::Puzzle & Word Games software developed by vlasovsoft. After our trial and test, the software was found to be official, secure and free. Here is the official description for pbchess: Chess training program for Windows, Linux, Android, Amazon Kindle, Kobo. Includes tactics, chess openings, endings training, playing with computer, analysing.
We have a lot of chess training materials ( tactics, endings, classic games ) for pbchess at our site:
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http://youtu.be/rr03RAVXTfs you can download pbchess free now.