Branded !

Examples like this should be burned into my brain, branded onto my left forearm, so I see it whenever I check the time.

It should be there so that I always remember to check all possible moves, or to remember that pawns are also active soldiers in the army of chessmen, 

I am not alone in this since the move I played, believing it to be the only possible winning move, was also the choice of 78% of the 2000 who failed at the problem

Overall, 64% of those who attempted it failed, which is quite something for a problem that appears very straightforward.

I'm sure you, dear readers, will not fail, since there is a big hint here, but spare a thought for those who did, and remember that pawns are more than the soul of the game, but are active players in their own right !

White to move

Solution, if needed