- Volf, Josef
source: 37 Nedele
source: Neděle
source-id: 37
date: 1904
algebraic: 
  white: [Kf7, Qc3, Bh2, Sa7, Pd3]
  black: [Kd5, Rd4, Sb8, Pf5, Pc7, Pa6]
stipulation: "#2"
solution: |
  "1...Nc6/Nd7 2.Qxc6#
  1...Rc4 2.Qxc4#/Qe5#
  1...Rb4/Ra4/Rg4/Rh4 2.Qe5#
  
  1.Qb3+??
     1...Rc4 2.Qxc4#
  but 1...Kc5!
  
  1.Bd6! (2.Qc5#)
     1...Kxd6 2.Qxd4#
     1...Nd7 2.Qc6#
     1...Rxd3 2.Qxd3#
     1...Rc4 2.Qe5#
     1...cxd6 2.Qa5#"
keywords: 
  - Flight giving key
  - Active sacrifice
  - Model mates