Dmitry Turevsky (Russia)
 
#2 6+1

1. Rb2?  2. Qc8# X 1... K:c6 Qc8#
                
1... Kb8! x
1. Rd8?  b8=Q# Y  1... K:d82. Qd7#
               
1... Kb6! y
1. Ra1!  zz  1... Kb8 x     Qc8# X
                     
1... Kb6 y     2. b8=Q# Y
                     
1... Kd6/d8  2. Qd7#

Theme: 2-flight giving key, Dombrovskis, BK-star (author)