! Sound move and the black rook is very happy on the a2 square and should not be moved untill the black pawns are ready. This move prepares a5 after Kb6
35. Rc4c3 Kb7b6 36. h4 Ra2a1
? That question mark goes to all of the moves that the black rook chases the white king exactly where it wants to go for the next few moves. The rook is much better sitting on the 2nd row and keeping the king stuck on the 1st row. It also keeps the white rook on the 3rd row and creates a large weakness on whites queenside while keeping the kingside from becoming active.
