This is the go problem on the lobby wall in the Hangzhou Tian Yuan Tower. If something is wrong, please comment and I'll correct it asap.
(;AB[bs]AB[br]AB[bq]AB[cq]AB[dr]AB[eq]AB[fp]AB[fo]AB[en]AB[cn]AB[cm]AB[bl]AW[aq]AW[ar]AW[bp]AW[cp]AW[dp]AW[dq]AW[ep]AW[bn]C[Show that the Impossible Tian Yuan Tower Problem isn't that impossible after all.White to live.]AP[goproblems]
(;W[er];B[fq]
(;W[ds]
(;B[cs];W[cr]C[KoRIGHT])
(;B[cr]C[Black should have gone for the ko, but he feels stubborn.]
(;W[fr];B[gr]
(;W[es];B[gs];W[ap];B[fs];W[as];B[cs];W[er]C[Under the stones!CHOICERIGHT])
(;W[ap];B[es];W[fs];B[gs]))
(;W[ap];B[fr]
(;W[as];B[es]C[FORCE])
(;W[es];B[fs];W[as];B[cs]))))
(;W[fr];B[ds]
(;W[cr];B[cs])
(;W[cs];B[cr]))
(;W[es];B[ds])
(;W[cs];B[es]
(;W[ds];B[cr];W[ds];B[fr])
(;W[fr];B[gr])))
(;W[ds];B[es])
(;W[fq];B[er])
(;W[es];B[er])
(;W[fr];B[er];W[fq];B[gq])
(;W[cr];B[cs];W[er];B[fq];W[fr];B[gr];W[es];B[gs])
(;W[co];B[er];W[bm];B[am])
(;W[ao];B[er];W[co];B[bm]))
