1.Kf7?/1.Kg7? (2.Qh6#) 1...g5 2.Qh3# 1...Kh4!

1.Qf4? Kh4 2.Qxg4# 1...g5!

1.Qe7! Kh6/g5 2.Qh4#/Qh7#

b) 1...g5 2.Qh3#

1.Kg7? (2.Qh6#)/1.Be2? 1...g5 2.Qh3# 1...Kh4!

1.Qe1? Kh6 2.Qh4# 1...g5 2.Qh1# 1...Kg5!

1.Qe4? Kh6/Kh4/g5 2.Qxg6#/Qxg4#/Qh7# 1...Kg5!

1.Qe7? Kh6 2.Qh4# 1...g5!

1.Qf4! Kh4/g5 2.Qxg4#/Qh2#

Keywords: flight giving and taking key in (a), characteristic twins (1.Qf4? 1.Qe7! / 1.Qe7? 1.Qf4!) with minimal difference between initial positions, changed (Qh1,Qh2,Qh3,Qh7 & Qg6,Qh4) / model (Qh3) / pin (wBd1-bPg4) mates

Animation on PDB: https://pdb.dieschwalbe.de/P1408074

Award: 4th Prize

Judge: Miguel Uris (Spain)