In Portugal we have had this service for many years and it works regardless of the bank (https://www.mbnet.pt in portuguese). Most people I know always generate one of these cards for online shopping, it's safer and easier to control.
404 karma · joined August 24, 2012
The standard strategy (without optimization) seems to work perfectly. You gain control by forcing the oponent to fill out the miniboards. The last move on the second exhausted miniboard will allow you to choose any miniboard, so it's an easy win.
EDIT: like 3pt14159 pointed out, O might cause you problems if he immediately picks the center in the NW miniboard. This needs further testing...