So, Google Play console has reported me a number of in-game crashes. After playing for a while i realized that something was broken threadwise. The bug was easy to reproduce and since i saw it (and had oportunity to test in some more android versions) i think it is a little more playable now. Mind you all that it still has some (probably a lot of) issues, so thanks in advance for your interest and patience. 

Took the oportunity to fix some flaws on the game rules, mostly related with the king mechanics (for the player it allowed movement in check, for the AI it insisted on moving its own king into check, even when the calculations showed it was prejudicial indicating that it was outside the scope of the AI mechanic).

I had some backlash from people who play chess more seriously and i get it that it is not a perfect game, but it is something i had a lot of fun making and is intended as training for my game, drawing, design and development skills and of course for my own enjoyment (which will be much more satisfying if enjoyed with others), so if you find bugs or something more serious in the way of your enjoyment i ask only for your criticism to be constructive, then i will take it seriously. 

Otherwise ¯\_ツ_/¯.