agreed 
Navigation With Keyboard in PGN Viewer
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The PGN viewer in chess com is pretty awesome as it is, but I think it lacks one important feature: being able to browse through the game with just arrow keys of the keyboard.
This may sound trivial for people who don't have that habit, but it's really a different experience to take your hand from that mouse and enjoy the liberation of pushing only one button on the keyboard (right or left arrow key) with ease and comfort. It would make the world a slightly better place. Trust me.
That's about as appealing as I could make it sound.