This section shows linguistic agreements that made it possible for some student books to be in free PDF to promote linguistic normalization in the corresponding languages.
Also, the altruistic collaboration of the translators cited made it possible to offer some books in other languages.
Likewise, the collaboration of some chess federations facilitated the dissemination of these translated and free books in PDF format among the clubs of their federation.
These books can be downloaded by clicking the PDF icon with a green arrow in the main menu and then selecting the corresponding language from the Free Books window.
In the solidarity collaborations it is indicated that agreements were signed with the down associations. Clubs and schools that buy student books at very special prices must make a donation per book purchased.