(;GM[1]FF[4]CA[UTF-8]AP[CGoban:2]ST[2] RU[Japanese]SZ[19]KM[0.00] PW[Weiß]PB[Schwarz]AW[om][pm][qm][rm][mn][sn][mo][so][mp][op][nq][mr][or][os][ps]AB[pn][qn][no][oo][po][ro][np][sp][oq][pq][sq][pr][sr][qs][ss]C[White to move - is there anything he can do?]PL[W] (;W[qr]CR[qr] (;B[rs]CR[rs]C[Of course, Black refuses to compromise :)] (;W[qp]CR[qp] (;B[pp]CR[pp] ;W[rp]CR[rp] ;B[qq]CR[qq] ;W[rq]CR[rq]C[A snapback! RIGHT CHOICE]) (;B[qq]CR[qq] ;W[rq]CR[rq] ;B[pp]CR[pp] ;W[rp]CR[rp]C[A snapback! RIGHT CHOICE])) (;W[qq]CR[qq] ;B[pp]CR[pp] ;W[rp]CR[rp] ;B[qp]CR[qp]C[The white attack failed.]) (;W[rp]CR[rp] (;B[rq]CR[rq] (;W[qq]CR[qq]C[White wins! This is good enough for White, but please not W R4 instead of W S4 woud have killed the whole group - in the actual variation, Black could have lived by playing B S3 at R4. RIGHT CHOICE]) (;W[qp]CR[qp] ;B[qq]CR[qq]C[Black is safe now])) (;B[qq]CR[qq] ;W[rq]CR[rq]C[A snapback! This is good enough for White, but R4 instead of S4 would have killed the whole group (here and now, Black can live with R4).RIGHT CHOICE]))) (;B[qq]CR[qq] ;W[rs]CR[rs] ;B[rn]CR[rn] ;W[sm]CR[sm] ;B[rr]CR[rr] ;W[qs]CR[qs]C[This is best for Black, but....])) (;W[rn]CR[rn] ;B[rp]LB[qr:A]CR[rp]C[The thraet of White A is gone.]) (;W[qp]CR[qp] ;B[qq]CR[qq]C[After this, White can't do anything.]) (;W[qq]CR[qq] ;B[qr]CR[qr]C[And now, Mr. White?!]))