Today I found one of my old 6x6 boards and just couldn't resist: I spent some minutes making a little problem....
(;GM[1]FF[4]CA[UTF-8]AP[CGoban:2]ST[2]
RU[Japanese]SZ[6]KM[0.00]
PW[Weiß]PB[Schwarz]AW[bb][cb][db][eb][bc][ec][ed][ae][ce][de][ee]AB[ba][ca][da][ea][ab][fb][ac][fc][bd][fd][be][fe][cf][df][ef][ff]C[White to play and live!]PL[W]
(;W[bf]CR[bf]
(;B[af]CR[af]
(;W[cd]CR[cd]
(;B[ad]CR[ad]
;W[dc]CR[dc]C[:) You found it! RIGHT])
(;B[dc]CR[dc]
;W[bf]CR[bf]C[White lives big :)]))
(;W[dc]CR[dc]
(;B[ad]CR[ad]
;W[cd]CR[cd]C[You found it :) RIGHT])
(;B[cd]CR[cd]
;W[bf]CR[bf]C[White wins big!])))
(;B[cd]CR[cd]
;W[fa]CR[fa]C[Uh-oh....]))
(;W[cd]CR[cd]
;B[dc]CR[dc]
;W[bf]CR[bf]
;B[af]CR[af]C[This was the wrong move order - White has no ko threat.])
(;W[dc]CR[dc]
;B[cd]CR[cd]))