The best penalty takers always aim for the corners.
Studies of professional penalties (including in major-tournament data) find that strikes aimed at the goalkeeper's central zone convert at a higher rate than expected, because goalkeepers commit early to one side. The 'corners only' rule is folk wisdom — well-placed central strikes are statistically excellent.
// sources1Penalty-kick research overview
Busted«Busted.»
// verdictBUSTED