The b2-bishop is no longer impressive, while the c4-pawn has turned into a weakness, something that Black soon exploits.

Followed by ...Rad8, leads to a clear black advantage – Keres.

A simple but strong restrictive measure. Other moves, such as 1.Bf4?! permit 1...Ba6! , perhaps followed by ...Bd3-g6, and Black drastically improves his worst piece.

1...Qd7 , preparing ...Bc6-b5, then White should consider 2.g4 Bc6 3.g5 Bb5 4.Qf3 , intending g2-g3, Kg2 and Rh1 with attacking chances.

A good diagonal for the bishop, where it prevents a liberating ...e6-e5 advance.

Swapping Black's "good" bishop in order to exploit his dark square weaknesses more efficiently.

White is clearly better.

Restricting the bishop on f1. It is worth observing that, in the absence of knights, White is unable to exploit the blockading square on d4.

Preventing f4-f5.

A senseless sacrifice; but after:
5.Bxe7 Nxe7 Black is also clearly better thanks to his superior minor piece.