Both sides go for a pawn storm. For the 42-side this leads to a winning attack. For the 33-side this just makes his position worse as he gives up the key d5-square and makes his pawns weak.

33 side’s defense
– keep pawn on c6 to control d5
– trade rooks on the d-file

The 33 side should keep pawn control over the d5-square

42 side’s attack
– double rooks on the d-file
– push the opponents pieces back with e4-e5 and f4-f5 and even g2-g4
– open up the opponents king

How to handle the Nc5
– It’s better to have the a-pawn on a5 than a6. This is because due to the attack of the Nc5.