lichess.org/training/7587
there is line 1. Qf2+ Kh1 2. Kd4 h2 3. Qf1X
but system consider it's wrong
and expects instead mate in 4, starting from 1. Ke4 ...
there is line 1. Qf2+ Kh1 2. Kd4 h2 3. Qf1X
but system consider it's wrong
and expects instead mate in 4, starting from 1. Ke4 ...