PawnSac: A classic lesson on conversion of space advantage.
White has a good advantage (better control of the center). c4 is stronger than d6 and can use d5 for exchanges. c7 may become a backward pawn. It is very difficult to play c6 after all.
It's good to draw the pawn to h6 as black will have to defend it, and white will gain a tempo. Note the attack on both sides of the board after..
After exchanging dark bishops h6 will always be under pressure.
black wants to play active on the Q side
Here then is that tempo gain. Black will have to play ..Rb8 again at some point, and white has relocated the B to d4 where it will trade on g7.
What has visibly pleasing diagonals on the Q side.
see comment to 11...♖b8
19.cxd5 thru 21.Qc3+
The structural superiority of c4 vs. d6 is now revealed. The knight must go back to f6 due to c7, and now..
The strength of white's initiative is clear.
White has a great space advantage.
"Just preventing d6 for the moment" Karpov
Stockfish preferred ..Rad8
white has just played h4 intending Bh3. The rook will have to move, so the immediate ..Rcd8 is more logical, and also preferred by Stockfish.
A flexible choice. White can double on the D, E, or F file.
offering to trade Q's which does not help black. But ..Qxa3 is no better
The end. What is black to do to stop e7? After ..Nxe6 41.Bx fx 42.Rx Rx 43.Rx Kx 44.d8=Q