Grover's algorithm is useful for very few things in practice, because for most problems we have a better technique than checking sqrt(N) of all possible solutio

Grover's algorithm is useful for very few things in practice, because for most problems we have a better technique than checking sqrt(N) of all possible solutions, at least heuristicly. There is, at present, no quantum algorithm which looks like it would beat the state of the art on Chess, Go, or NP-complete problems in general.