In this position I played b5-b4? After Na4 I did not like my position for pawn c5 is getting weak when white playing e4-e5 later. Also knight is protecting b2 (and b6). So I overlooked Na4.
Also don't know if it is wise to move pawns so far ahead. For later it makes it easy for your opponent to get his pieces behind your pawns and these intruders can be very annoying.
8
7
6
5
4
3
2
1
a
b
c
d
e
f
g
h
1nbqk1nr/r2p1pbp/p3p1p1/1pp5/4PP2/1BNP1N2/PPP3PP/R1BQK2R b KQk - 1 8