The problems below illustrate usefull themes such as : self stalemate, tempo, under-promotion, sacrifice, diversion, positionnal understanding and forced combinations.
Solutions
a8N – Bd2 – Kf6 – Rc8+ – Qg5
Ne4+ – Kd4 – Bf4 – Bh3+ – Ra1
Kh1 – Bg2+ – Kg6 – e5