Christian Poisson (France)
 
#11 2+2

b) Rb1 → Re8
1.Kc4! Kb2 2.Qe5+ Ka3 3.Qa5+ Kb2 4.Qb4+ Ka2 5.Qa4+ Kb2 6.Qb3+ Kc1
7.Qc3+ Kd1 8.Kd3 Rb3 9.Qxb3+ Ke1 10.Qf7! Kd1 11.Qf1#
b)
1.Qf4+! Kb1 2.Kc4 Ka2 3.Qf7! Rc8+ 4.Kd4+! Ka1 5.Qa7+ Kb2 6.Qb7+ Kc2
7.Qxc8+ Kb3 8.Qc3+ Ka4 9.Qb2 Ka5 10.Kc5 Ka6 11.Qb6#