source-id: 1167
date: 1980
date: 1980-08-01
algebraic: 
  white: [Kb4, Qh3, Rd8, Be6, Sf6, Se2, Pg5, Pf2, Pe4, Pc5]
  black: [Ke5, Qh7, Re8, Ra1, Bb5, Sa4, Ph4, Pf4, Pc6, Pc4, Pb3]
stipulation: "#2"
solution: |
  "1...Qh6/Qh5/Qh8/Qg7/Qf7/Qe7/Qd7[a]/Qc7/Qb7/Qa7/Qf5/Qg8 2.Qf5#[A]
  1...Qxe4[b] 2.Nd7#[B]
  "1...Qxe4[b] 2.Nd7#
  
  1.Rxe8[C]? (2.Bf7#[D])
     1...Qd7[a]/Qc7/Qb7/Qa7 2.Qf5#[A]/Bxd7#
     1...Qh8/Qg8 2.Qf5#[A]/Bg8#
     1...Qe7 2.Qf5#[A]
     1...Qf5 2.Qxf5#[A]/Bxf5#
  but 1...Nxc5!
  
  1.Bf7[D]? (2.Rxe8#[C])
  1.Bf7? (2.Rxe8#)
     1...Re6  2.Qxe6#
     1...Nxc5 2.Qc3#
     1...Qh8/Qxf7/Qf5/Qg8 2.Qf5#[A]
     1...Re6/Rxd8/Rf8/Rg8/Rh8 2.Qxe6#
  but 1...Re7!
  
  1.Bd5? (2.Ng4#)
     1...Qd7[a] 2.Nxd7#[B]
     1...Qxe4[b] 2.Rxe8#[C]
     1...cxd5 2.Rxd5#
     1...Qh5 2.Qf5#[A]/Nd7#[B]
     1...Qf5 2.Qxf5#[A]
  but 1...Rg1!
  
  1.Bf5?? (2.Ng4#)
     1...Qh5 2.Nd7#[B]
     1...Qxf5 2.Qxf5#[A]
     1...Qxe4 2.Rxe8#
  but 1...Rg1!
  
  1.Ng4+??
     1...Kxe4 2.f3#/Rd4#
  but 1...Kxe6!
  
  1.Nd7+[B]??
     1...Qxd7[a] 2.Qf5#[A]
  but 1...Kxe4!
  
  1.Nd4! (2.Nf3#)
     1...Qxe4[b] 2.Ng4#
     1...f3 2.Qh2#
     1...Qh5/Qf5 2.Qf5#[A]"
     1...Qxe4 2.Ng4#
     1...f3   2.Qh2#
     1...Qh5/Qf5 2.Qf5#"
keywords: 
  - Changed mates
  - Threat reversal
  - Urania