I saw this posted online. It’s an old favorite that I don’t think I’ve ever posted here, so here’s the task: White to play and mate without moving the queens off the first rank.
This was composed by F.S. Ensor. 1.Qe1 Ka7 2.Qh1 Ka6 3.Qhg1 Ka5 4.Qgf1 Ka4 5.Qce1 Ka3 6.Qa1+ Kb3 7.Qeb1#