That is game-dependent, so we can't be sure it would result in pro-level when playing chess. In fact, it is very possible that it wouldn't because chess has a m

That is game-dependent, so we can't be sure it would result in pro-level when playing chess. In fact, it is very possible that it wouldn't because chess has a much smaller branching factor than go (and many more practically forced moves etc.). Also, changing the heuristic you use to chose candidates (selectivity) doesn't mean you're not doing search anymore!