PGN4:
[StartFen4 "R-0,1,0,1-0,0,0,0-0,0,0,0-13,0,14,0-5-{'wb':true,'dim':'8x8'}-x,x,x,x,x,x,x,x,x,x,x,x,x,x/x,x,x,x,x,x,x,x,x,x,x,x,x,x/x,x,x,x,x,x,x,x,x,x,x,x,x,x/x,x,x,x,yI,x,1,x,1,x,yG,x,x,x/x,x,x,1,x,1,x,yK,x,1,x,x,x,x/x,x,x,x,1,x,1,x,1,x,yγ,x,x,x/x,x,x,1,x,rK,x,yI,x,1,x,x,x,x/x,x,x,x,1,x,rI,x,1,x,1,x,x,x/x,x,x,1,x,1,x,rI,x,1,x,x,x,x/x,x,x,x,1,x,1,x,1,x,rC,x,x,x/x,x,x,1,x,1,x,1,x,1,x,x,x,x/x,x,x,x,x,x,x,x,x,x,x,x,x,x/x,x,x,x,x,x,x,x,x,x,x,x,x,x/x,x,x,x,x,x,x,x,x,x,x,x,x,x"][Variant "FFA"][RuleVariants "CaptureTheKing EnPassant PromoteTo=BCFGIS"][CurrentMove "0"]
Difficulty: Hard.
Themes: Endgames, Zugzwang, Switchback, Domination
Please note that there exists only one solution, everything else allows black/yellow to draw / win.
White/red to play and win.