Try not to let your opponent get unneeded counterplay. Try to keep things under control if you can.
For example, in the following position, the very strong grandmaster playing Black, played Kxb3. This allowed Qb5+ and this led to a very messy position where White was able to get a draw eventually. Certainly, after Qb5+ the position becomes very difficult to analyse, and very hard for Black to find the win.
Kxb3 is the right idea for Black, but first he must find a move that stops White’s counterplay. What is that move?
The solution to last Monday’s problem is that f4 wins for Black as he can eventually queen the h-pawn.