black: [Ke4, Rb2, Bf3]
stipulation: "h#2  duplex"
stipulation: "h#2"
options: 
  - Duplex
solution: |
  "a)  1. Rb3  Bb8    2. Re3  Sg3#
  b)  1. Bd4  Rb5    2. Bc3  Bxe2#"