The control of the d-file was White's big plus in this game from the current Tal Memorial, and with his last move 20.Rfd1 he aspired to force a decision of the black rook d8. Now the exchange on d6 is...

A) ... good and leads to complete equality;
B) ... bad since after 21.exd6 the attacked Nc7 has to move and the white passed pawn becomes too strong.

Solution