authors: 
  - V.Arbo
  - Arbo, V.
source: 
algebraic: 
  white: [Kg1, Qb7, Bd4, Sg6, Sd8, Pf2, Pe2, Pa6]
  black: [Kc4, Bh1, Pg2, Pa7]
stipulation: "#3"
solution: |
  "1.Qb7-b1 ! zugzwang.
        1...Kc4*d4 
            2.Qb1-b4 + 
                2...Kd4-d5 
                    3.e2-e4 # 
        1...Kc4-d5 
            2.Qb1-d3 threat:
                    3.Bd4-e3 # 
                    3.Bd4*a7 # 
                    3.Bd4-b6 # 
                2...Kd5-d6 
                    3.Bd4-b6 #"
keywords: