(;GM[1]FF[4]CA[UTF-8]AP[CGoban:3]ST[2]
RU[Japanese]SZ[19]KM[6.50]
C[https://www.youtube.com/watch?v=dZ4UuUR2Zj8

100 myosu (brilliant tesuji) problems from professional games in about 25 half-hour videos by Kim Seong Ryung.

This series is perfect for dan players looking for ideas and practice, but it can also be helpful, and certainly exciting for SDKs.
___

The first minute shows 3 myosu positions each with a suggested move. One is the correct myosu, the others are aksu (blunders). Your job is to find the myosu.]
;B[]
(;W[]
;AW[dd][rk][rl][sl][cm][pm][qm][rm][nn][on][sn][co][po][qo][cp][mp][pp][qp][qq][qr][rr]AB[pd][qk][pl][om][dn][pn][qn][rn][do][mo][no][oo][ro][rp][eq][nq][oq][pq][rq][sr]C[1995 08 09

Myeongin

W Yang Jae Ho
B Lee Chang Ho

Lee's brilliant ladder strategy]
;B[dm]
;W[cl]
;B[dl]
;W[dk]
;B[cn]
;W[bn]
;B[ck]
;W[cj]
;B[bk]
;W[bl]
;B[bj]
;W[ci]
;B[bi]
;W[ch]
;B[bh]
;W[cg]
;B[bg]
;W[cf]
;B[bf]
;W[dq]
;B[dr]
;W[cr]
;B[dp]
;W[cq]
;B[ek]
;W[dj]C[this is the starting position, so pause to think]
(;B[ce]C[normally you have to play here]
;W[de]
;B[cd]
;W[cc]
;B[bc]
;W[bb]C[W has good territory in the lower left and right and good shape in the top left

B is unsatisfied])
(;B[de]C[this is the brilliant idea]
(;W[ce]C[this doesn't work]
;B[nm]C[this is a ladder])
(;W[ee]C[so W only has this]
;B[ce]
;W[ef]
;B[ed]C[presenter says something like this creates the critical winning chance for B (seung bu)])))
(;AW[mc][dd][ed][fd][hd][id][jd][ld][ce][me][qf][gg][jg][dh][gh][bi][di][ji][ki][qi][ej][gj][hj][ij][lj][dk][ek][gk][cl][el][fl][ql][cm][gm][hm][dn][pn][bo][co][do][fo][ho][mo][dp][mp][np][hq][kq][oq][or][os][ps]AB[lb][ic][jc][nc][md][nd][od][pd][rd][ee][ne][cf][df][ff][dg][fg][bh][eh][lh][ei][fi][gi][hi][li][dj][fj][kj][fk][gl][hl][il][dm][fm][im][bn][cn][qn][io][no][qo][bp][fp][gp][hp][op][pp][cq][dq][pq][fr][pr][rr][qs]C[12th BC card cup shininwang

2001 11 08

W Park Seungcheol 1d
B Yun Hyeok 3d

W to play

B tenukied from the upper left group, knowing the difference between alive and dead groups is critical in a fight

it isn't easy to kill B, so what is the key shape point?

But ...]
(;W[bf]C[too simple]
;B[bg]
;W[be]
;B[ci]
;W[cj]
;B[ch])
(;W[ch]C[doesn't work]
;B[cg]
;W[cj]
;B[be]
;W[bd]
;B[af])
(;W[bg]LB[bf:D][ah:C][ch:B][ci:A]C[so this is the key move

but ...

B has a myosu to live!!

you have 10 seconds to choose from 4 options]
(;B[ci]
;W[cj]
;B[ch]
;W[bj]C[B is dead]
;B[dj]
;W[di]
;B[bf]
;W[ah]
;B[af]
;W[ag]
;B[bc]
;W[be]
;B[ae]
;W[bd]
;B[ad]
(;W[cc]C[not here])
(;W[cb]))
(;B[ch]
;W[ci]C[this is the same as A

black is dead])
(;B[ah]C[this is correct!]
;W[bf]
(;B[ci]
;W[cj]
;B[ch]C[this fails])
(;B[cj]C[but here!]
;W[ci]
;B[bj]C[B lives]))
(;B[bf]
;W[ch]
;B[bd]
;W[be]
;B[ae]
;W[cc]
;B[bc]
;W[cb]
;B[bb]
;W[ba]C[B dies])))
(;AW[eb][nb][ec][gc][hc][nc][dd][ed][fd][md][od][pd][pe][ef][pf][qg][qj][cl][cm][bn][bo][co][dp][fq]AB[fb][cc][fc][mc][oc][pc][qc][cd][gd][ld][nd][qd][fe][ne][oe][df][dg][ck][bl][bm][dm][cn][dn][bp][pp]TR[md][cl]C[5th SK gas cup

2002 05 17

W Heo yeong ho 1d
B Chu Hyeong uk 2d

there are two ladder shapes B is using, so how does W use the aji?]
(;W[ii]C[W could just throw a stone in, that might be a normal game, but B doesn't have to save both ladders]
;B[me]C[this is bigger]
;W[dl]
;B[ek]C[as this loose net is good shape, and J11 is not well placed]
;W[el]
;B[fl]
;W[em]
;B[dk]
;W[en])
(;W[dl]C[so W decides to run here first as a probe

B can't sacrifice the upper right so easy as if W gets N15, the upper right collapses]
;B[el]
;W[fj]C[it looks like W's plan is clever - B is in trouble on both sides. This is a ladder breaker for both.

It looks like W can say I've got this game in the bag now.

but B has a myosu!]
;B[gj]C[this is a double ladder maker too!]
;W[gi]C[this breaks both ladders!]
;B[hi]C[this makes both ladders!]
;W[kf]LB[jf:A][lf:C][kg:B]C[this breaks both ladders!

maybe W can say, "OK" I've got this again

you have 10 seconds to find B's response]
(;B[jf]C[this is correct to make both ladders]
;W[jg]C[in the game]
;B[ig]
;W[hj]
;B[dk]
(;W[me]C[this still doesn't work]
;B[mf]
;W[le]
;B[ke]
;W[lf]
;B[lg]
;W[kg]
;B[kh]
;W[jh]
;B[ji]
;W[ih]
;B[hh])
(;W[je]
;B[me]
;W[kc]
;B[lb]C[this is the game!]))
(;B[kg]
;W[me]
;B[mf]
;W[le]
;B[ke]
;W[lf]C[B in trouble])
(;B[lf]
;W[dk]
;B[dj]
;W[ek]
;B[fk]
;W[ej]
;B[ei]
;W[fi]
;B[fh]
;W[gh]
;B[gg]
;W[hh]
;B[ih]
;W[hg]
;B[hf]
;W[ig]
;B[jg]
;W[if]
;B[ie]
;W[jf]C[W escapes]))))