gamble

This is football (soccer). I don't understand the word "gamble" here. Usually it means to bet, take a chance,

85' GOAL! Aubameyang caps off the game with fantasic instinct. Ramos drags a shot across goal and the Gabonese international is the only man to gamble on the back post and is able to slide home Dortmund's fourth of the afternoon.

Aubameyang covered the back post (and scored the goal) without knowing whether the ball would go there. He took a chance that the ball would go there.