(;CA[gb2312]AB[eq][cj]C[White first to invade Black's territory
]AP[MultiGo:4.4.4]
SZ[19]AB[cp]MULTIGOGM[1]

(;W[cn];B[dm]C[When white approaches black's stronger side, it could be easily attacked by black])
(;W[cl]C[White 1 is an appropriate move for invasion];B[ek];W[co]C[Black 2 attacks white by blocking it from escape
However, white can approach from tesuji at 3. Its purpose is either to make a living or try to escape.]
;B[do];W[cn]
(;B[bp];W[em]C[Black blocks at 6 to prevent white from making eyes, thus white can escape at 7])
(;B[em];W[bp];B[cq];W[bq]C[If black completely blocks white from the top, white can live on the side])))