I think so, I've used online for much of my studying and practice over the past several years, and when I do get a chance to play over the board I am noticably stronger. Had to table chess for a few months due to life issues but now I am back and working my way back from where I left off.
How well does online play and tactics practice translate to OTB play?
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Do you feel that tactics puzzles and play in a 2D environment tranlate to 3D OTB skill?
No, Somewhat, Yes?