I've got my knight on g4 and bishop on c5.
The bishop ate and gave a check on f2.
King moves to f1. Bishop is deep but can't give a threat to the white king anymore.
I give a try and start hovering my knights around his king. I had in my mind that if I keep harrassing him with my knights, my bishop on d7 and queen and rook on h8 would eventually give a mate.
So
At the first picture, bring queen to f6.
Then move the bishop on f2 away for discovered check. Then I have clearly won the game.
But errors make the game more interesting sometimes.