1. c4 Nf6 2. Nc3 d5 3. cxd5 Nxd5 4. g3 e5 5. Bg2 Nb6 6. Nf3 Nc6 7.
19... Bf8 (draw, 33) Gomez-Korchnoi, 1991.
An error of judgment. The ending is good for White.
The knight returns to this thematic square. The black pawns on b7 and c7 are weak.
The exchange of pawns leaves the black c-pawn indefensible.
White wants to win a pawn without giving up his bishop.
Black should exchange rooks, when White has to play precisely to win.