This is the first episode of a seven-part series from R2E Documentary on One.

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There's a moment in every horse race where things become clear. There's a moment in every horse race where things become clear.

That can be at the finishing line, around the last turn, over the last fence.

Some say that it happens before all that, that it's destiny.

So out in front the Mayor Magic Flight leads flight leads Rathbinder than Tiger Roll.

Every year there's one horse race that sparks the world's imagination, the Grand National.

And in 2019, an Irish horse named Tiger Roll was sent to stage.

...a national Tiger Roll, moving through the press magic.

Aiming to do something that hadn't been done in almost 50 years,

winning the world's greatest steeple chase for a second time in a row.

And Tiger Roll goes to the front in the nation.

Down to the last and I gradually go into and meeting the last of brilliant stride.

Just at this point, where everything is starting to become clear in this race,

if you look at Tiger Rolls jockey, Davy Russell, he's pretty much motionless.

It's as if Tiger is racing himself.

All I do is I open out my fingers. I don't even have to push and I squeeze my

legs and just open up my fingers and the quickens don't last. I'm just gone.

At the national, the noise from the crowd and the home stretch is deafening. The weight of

expectation from everyone connected to Tiger is heavy.

There's 600 million people watching the race live around the world, yet all that sits easy

...