Finish rules translation in Spanish + improve existing ones Design: final touch (gain extra space on top, using space on the right) Crazyhouse: center reserves, grey if zero available, numbers superimposed Promotions: increase pieces sizes, better background. Code: use two spaces instead of tabs, everywhere. Increase code line length to 100 or more? (http://katafrakt.me/2017/09/16/80-characters-line-length-limit/)