Is it that simple? Or would you still be bad, or simply slightly less bad instead of being GM level. Do some bad choices make sense at higher levels similar to a queen sacrifice? So would making good moves actually be bad ones and vice versa?
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If by "the opposite of bad" you mean merely avoiding error...then no, mere blunder-checking will not make you a good player. It's not just a matter of avoiding bad moves; you also have to come up with good ones. :)
There are positions (mostly in computer's games) where many moves are good, but there is always a point when only one single move is good. To win you must find that move.
