Sacrificing a pawn to clear the a1-h8 diagonal for the bishop.

Preferable was 2.exd5 e4 3.Nxe4 Bxb2 4.Bf3 Bxa3 5.Rd3 although Black's bishop pair and outside passed pawn should tell in the end.

The passed pawn manages to advance all the way to e3.

With a clear advantage.

Swapping off the knight on e5 in order to clear the long diagonal towards the black king.

Preventing 3 Qc3 and creating the threat of 3...c4, which White parries with his next move.

Heading for h6,

Preparing Be4 and Bxg6, a plan impossible to stop.