(;GM[1]FF[4]CA[UTF-8]AP[CGoban:3]ST[2]RU[Japanese]SZ[19]KM[0.00]AW[dp][ep][fp][gp][cq][gq][cr][fr][ds][fs]AB[co][do][eo][fo][go][ho][cp][hp][dq][hq][gr][hr][gs]C[The white stones on the right are short of liberties - only four in all, and only two for the top five stones.];B[er]C[This sets up a snapback on the five stones. A snapback is a standard tactical trick and well worth learning.]
(;W[es]C[If White plays here, say, the snapback takes place.];B[fq];W[eq];B[fq])
(;W[dr]C[This defends against the snapback, but Black can connect instead, putting the five white stones directly in atari. If White connects, it's a case of 'connect and die', as he still has only one liberty.];B[eq];W[fq];B[es])
(;W[fq]C[This is another way to prevent the snapback, but the white stones still have only two liberties.];B[es]C[And now only one.])
(;W[bp]C[White can give them up and save the remaining stones in the corner.];B[bo]
(;W[aq];B[br];W[bs];B[ar];W[dr];B[eq]
;W[bq]C[Two eyes!])
(;W[br]
(;B[ar];W[aq]
(;B[as];W[bs])
(;B[bs]
;W[cs]C[Two eyes]))
(;B[ap];W[aq]
(;B[ao]C[If Black doesn't play a ko fight...];W[as];B[cs];W[dr];B[eq]
;W[bq]C[Two eyes.])
(;B[bq]C[But if Black wins the ko fight, the white stones die.];W[sa];B[bp]
(;W[bs];B[ar])
(;W[ar];B[bs])))
(;B[aq];W[ap];B[ar];W[bs];B[ao];W[bq];B[dr];W[fq];B[sa];W[cs]
;B[rb]
;W[es]C[Two eyes.]))))
