<div class="user_solution">a) 1.Bg3! Kf3 2.Kd5 Kxe2 3.Ke4 Kd2 4.Rc2# (1. В<span style="font-size: medium;">~</span>?<span style="font-size: medium;"> </span>but: Kf3!)</div><div class="user_solution"><div>b) 1.Kg1! Kf3 2.Sc1 Ke4 3.Kf2 Kd4 4.Rc4# (1.Sc1? Kf3 2.Kg1 Ke4 3.Kf2 Kd4 4.Rc4# but: 1...Kd4!)</div><div>c) 1.Sh4! Kd4 2.Sd5 Ke4 3.Ba7 Ke5 4.Re3# (1.Se7? Kd4 2.S3d5 Ke4 3.Ba7 Ke5 4.Re3# but: 1...Kf3!)</div><div><br /></div><div>3 frontal Rook MM. Interestingly, that in the first problem, the knight is sacrificed, and in the second and third twin, this knight tries to avoid his sacrifice in any possible way</div><br /></div><br />