(;GM[1] FF[4] AP[Hibiscus:2.1] SZ[19] ST[3] ;KM[0] PW[White] PB[Black] AB[nd][pd] AW[ob][kd][qf] LB[ob:A]C[White at 'A' is hamete, how should black respond] (;B[qc] CR[qc];W[mc] CR[mc]LB[mc:2][pi:A];B[pi] C[RIGHT If Black has some back up in the lower right this way of playing can't be bad for him] )(;B[mc] CR[mc];W[qd] CR[qd](;B[pc] CR[pc];W[qc] CR[qc];B[pb] CR[pb];W[lb] LB[ob:A]CR[lb]C[White has sacrified the hamete stone (A) and squeezed black's stones into an overly concentrated group of stones. Black is now left in a very difficult position] )(;B[qc] CR[qc];W[pc] CR[pc];B[oc] CR[oc];W[pb] CR[pb](;B[qe] CR[qe];W[rd] CR[rd];B[pe] CR[pe];W[re] CR[re];B[nb] CR[nb];W[qb] CR[qb]C[The black stones are too heavy, but many players would be satisfied with Black's position. Black can do much better] )(;B[rd] CR[rd];W[qe] CR[qe];B[qb] CR[qb];W[nb] CR[nb](;B[mb] CR[mb];W[rb] CR[rb];B[rc] CR[rc];W[qa] CR[qa];B[ra] CR[ra];W[sa] CR[sa];B[pa] CR[pa];W[oa] CR[oa];B[sb] CR[sb];W[sc] LB[sb:A]CR[sc]C[Black's only hope at this point is to play ko with A. If white choses to play ko, this would be a very long ko battle for black to win] ;B[sd] CR[sd];W[re] CR[re];B[sb] CR[sb];W[nc] CR[nc]C[White does not need to play the ko. And white can instead play to take the outside] ;B[ra] CR[ra];W[od] CR[od]C[Black's outside stones are toast.] )(;B[rb] CR[rb];W[nc] CR[nc];B[od] CR[od];W[md] CR[md]C[Black is alive in the corner, however black's outside stones are in trouble] ))))(;B[oc] CR[oc];W[pb] CR[pb];B[nb] CR[nb];W[mc] CR[mc];B[nc] CR[nc];W[rd] CR[rd];B[qc] CR[qc];W[rc] CR[rc];B[qb] CR[qb];W[qi] TR[mb][rb][oe]CR[qi]C[Black has many weaknesses to exploit] )(;B[pf] CR[pf];W[qc] CR[qc](;B[qe] CR[qe];W[qg] CR[qg];B[rd] CR[re];W[mc] CR[mc];B[pg] CR[pg];W[qh] CR[qh]C[Black's shape is very poor] )(;B[qd] CR[qd];W[rc] CR[rc];B[qg] CR[qg];W[mc] CR[mc]C[White has taken the corner with 5 stones, leaving black's 5 stones overly congested] ))(;B[pb] CR[pb](;W[oc] CR[oc]C[CHOICE] ;B[pc] CR[pc];W[od] CR[od];B[oe] CR[oe];W[mc] ;B[qe] ;W[pf] ;B[pe] C[RIGHT Black has great strength in the corner. Later black will have a strong attack on either of the two White groups by playing at A or B. The correct response to the hamete was Q 18 (C)] LB[pe:9][pb:C][pe:9][ic:B][pi:A])(;W[pc] CR[pc]C[This is White's best play at this point.] ;B[oc] CR[oc];W[qc] CR[qc](;B[nb] CR[nb];W[qd] CR[qd];B[pe] CR[pe];W[qb] CR[qb];B[oa] LB[re:B][qh:A]CR[oa]C[RIGHT This exchange is about equal for both players. Later, Black has a play at A aiming at a tesuji play at B] )(;B[qd] ;W[qb] ;B[nb] ;W[pa] C[RIGHT Black looks a little thin but A and B are sente against the corner so Black is more powerful than he looks.] LB[pa:8][rd:A][ma:B][na:B])))(;B[nb] CR[nb];W[oc] CR[oc];B[nc] CR[nc];W[od] CR[od];B[oe] CR[oe];W[qc] CR[qc];B[qd] CR[qd];W[rc] CR[rc];B[rd] CR[rd];W[pe] CR[pe]C[This exchange is very bad for Black. White has a strong corner, and Black has only a weak string of stones on the outside.] ))