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					Originally Posted by lapaget  However I am publishing on Amazon also, and the conversion to AZW3  with Calibre (last version) only works for very small files, and not in the same way on a previewer or a Kindle Fire. I would say "erratic" | 
	
 Since Amazon KDP is known to reject (perfectly fine) .azw3 files created by Calibre, why don't you try to upload the .mobi file that Kindle Previewer creates? (Even though it has a .mobi extension, it's a hybrid file that contains both a traditional .mobi/prc file and an .azw3 file.)
BTW, since all Kindles and Kindle apps come with the 
Code2000 Unicode fallback font, there's no need to embed a chess font as long as the chess symbols in your book have been encoded as 
Miscellaneous Symbols Unicode characters (U+2654-U+265F).