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Supposedly, ZM, there's a lot of data been programmed into the computer and a set of complicated algorithms have determined the likely outcome of the event. This has been used alongside previous Nationals; in 2017 it predicted Cause Of Causes to win (finished 2nd behind One For Arthur), in 2018 it correctly predicted a win for Tiger Roll @ 10/1, then last year it incorrectly forecast Rathvinden to win with actual winner Tiger Roll in 2nd.
By the way; horses DO fall in the Virtual Grand National (not in those screened every day in betting shops).