This sacrifice is hardly any correct, but White was short of active plans.

The extra pawn will be decisive.

Intending Bh4-g3 to swap Black's good bishop and prevent the ...Nh5-f4 manoeuvre. The bishop transfer to g3 is indeed a common idea in this French structure.

Black prepares ...e6-e5 in order to get rid of the backward pawn on e6.

Thanks to the isolated pawn, White is slightly better.

Preparing ...Kh7 and ...Bh6 in order to swap the "bad" bishop for the "good" one.

Black manages to swap the rooks before White puts a knight on b6.

Fixing the b3-pawn on a light square.

Preparing ...Nd7-c5 with a clear advantage. Evidently the dark-squared bishop is missing in the white camp.