(;GM[1]FF[4]CA[UTF-8]
SZ[19]RU[Japanese]KM[0]TM[1800,0,30,5]PW[]PB[]AB[bb]AE[ab]AB[ac][bc][cc][cb]AW[db][da]AB[eb][dc]AW[ec][dd]AB[fb]AW[fc][gc][gb]AE[ed]AB[cd][bd]AW[ce][be][ae][ad]AE[ee]AW[de]PL[W]
(;W[ab]CR[ab]
;B[aa]CR[aa]
(;W[ca]CR[ca]C[RIGHT
black can't approach on either side])
(;W[fa]CR[fa]
;B[ca]CR[ca])
(;W[ea]CR[ea]
;B[ca]CR[ca]))
(;W[ba]CR[ba]
;B[aa]CR[aa]
(;W[ab]CR[ab]C[ko])
(;W[ca]CR[ca]
;B[ea]CR[ea]))
(;W[ca]CR[ca]
;B[ba]CR[ba])
(;W[fa]CR[fa]
;B[ca]CR[ca]
;W[ea]CR[ea]
;B[aa]CR[aa])
(;W[ea]CR[ea]
;B[ca]CR[ca]
;W[fa]CR[fa]
;B[aa]CR[aa])
(;W[aa]CR[aa]
;B[ca]CR[ca]))