(;CA[ks_c_5601-1987]AB[pd]AW[dd][dp]C[Lecture 11 When not to block Made by lovelove @L19 http\://www.lifein19x19.com/forum/viewtopic.php?f=15&t=7273] AP[MultiGo:4.4.4]SZ[19]AB[pq]MULTIGOGM[0] ;B[fq];W[po];B[cn];W[dn];B[dm];W[en];B[co];W[cp]LB[gp:A][em:B][do:C]C[A and B are joseki. C is a trick move.] (;B[gp];W[eq]LB[er:A][ep:B]C[A is joseki and B is a mistake.] (;B[er]LB[fp:A][dr:B]C[Don't block at B.] (;W[fp];B[fr];W[dr]LB[gn:A][fo:B]C[Atari at B is a bad exchange.] (;B[gn];W[fm];B[ck]LB[bo:A][cf:B]C[White cannot tenuki (see B)] (;W[bo]C[joseki]) (;W[cf];B[cr];W[ds];B[cq];W[dq];B[bp]C[D4 group has no eyes.])) (;B[fo];W[ep];B[gn];W[dk]C[White no needs to play B5.];B[cr];W[ds];B[cq];W[br]C[tesuji] ;B[bq];W[bp]C[c3 captured])) (;W[dr];B[ep];W[dq];B[ck];W[do];B[kq]C[Black can play both sides and there are aji left in LL corner.])) (;B[ep];W[er];B[ck];W[do];B[kq];W[fr]C[hard for black to respond])) (;B[em]LB[fm:A][fp:B]C[A derives complicaed variations. B to keep simple.] (;W[fm]LB[do:A][fn:B][fl:C][ck:D]C[A for territory B for influence C for a ko fight D for simplicity] (;B[do];W[eo];B[ep];W[cm];B[fn];W[fo];B[go];W[gn];B[fp];W[fn];B[bp];W[bq];B[bo] ;W[bm];B[cq];W[el]C[black territory vs white influence]) (;B[fn];W[fp];B[gp];W[go];B[fl];W[hp];B[gq];W[fo];B[gm];W[hq];B[eq];W[dr];B[bp] ;W[bq];B[br];W[dq]C[black influence vs white territory]) (;B[fl];W[fp];B[gp];W[eq];B[fo];W[ep];B[gm];W[fn];B[gn];W[gq];B[hq];W[fr];B[gr] ;W[hp];B[fq];W[gl];B[fk];W[gq];B[go];W[iq];B[fq]C[ko fight]) (;B[ck];W[eq];B[fp];W[ep]LB[jp:A][jq:B][ip:C][iq:D]C[Next move is A, B, C, or D depending on situation and preference.])) (;W[fp];B[gp];W[eq];B[fo];W[ep];B[fm];W[gq];B[hp]C[joseki])) (;B[do]LB[eo:A][ep:B]C[Blocking at A is getting tricked. B is the right response.] (;W[eo];B[ep];W[cm];B[bp];W[bq];B[bo]LB[dr:A][dl:B]C[A-B miai] (;W[dr];B[cl]) (;W[dl];B[cq])) (;W[ep] (;B[eo];W[fp];B[fo];W[gp]C[White has fourth line territory.]) (;B[iq];W[eo]C[white very thick]))))