Daily Problems

Written by Super User on . Posted in Study

Daily problems

tesuji: white to play
{"filetype": "problem", "autocrop": true}
(;FF[4]GM[1]SZ[19]ST[2]CA[UTF-8]AP[SGFC:1.16]

PB[Black]
PW[White]
KM[0]
RU[Japanese]

AW[dp][ep][fp][cq][fq][gq][cr][hr][ir]AB[dn][co][fo][go][cp]
[gp][dq][hq][iq][kq][br][dr][jr]LB[aa:1]C[Ex. 7 Life or death ( W to play)
The 2 W stones in the corner are in a position to be captured.
You will have to be very skillful to get 2 eyes on the cramped lower side.]
PL[W]
(;W[cs]LB[cs:1]C[Diag. 3 - Correct
If you want to play a lot of kikashi moves from the outside,  the general principle is to add sute ishe. W 1 sagari is an appropriate suji for this purpose. (cont.)]
;B[bq]LB[bq:2]C[If B plays 2 (cont.)];W[er]LB[er:3]C[W 3 (cont.)]
;B[bs]LB[bs:4]C[B 4 (cont.)];W[es]LB[es:5]C[and W 5 osae are effective.]
;B[ds]LB[ds:6]C[B captures 3 stones (cont.)];W[gs]LB[gs:7]C[When W plays 7, allowing B to capture 3 stones at 6, he has cleverly secured life.
If you want more kikashi moves, you should increase the number of sute ishi.]
)
(;W[bq]LB[bq:1]C[Diag. 1 - Failure
Most people would try the magari W 1, but there is a fundamental flaw in the idea. (cont.)]
;B[cs]LB[cs:2]C[When B plays 2, (cont.)];W[er]LB[er:3]C[W is too late even if he plays kosumitsuke 3. (cont.)]
;B[bp]LB[bp:4]C[After 4 (cont.)]
(;W[gs]LB[gs:5]C[W 5 (cont.)];B[is]LB[is:6]C[and 6, W is dead.]
)
(;W[is]CR[is]C[Diag.2 failure
Even if he tries this magari instead, it has no effect. (cont.)]
;B[gs]CR[gs]C[The sequence up to B 6 ensures W's death])))

       
intermediate: black to play
{"filetype": "problem", "autocrop": true}
(;FF[4]GM[1]SZ[19]AP[SGFC:1.16]AB[sp][rp][qp][pp][op][qq][nq]
[mp][mr][lr]AW[ms][nr][oq][or][qr][rr][rq]
(;B[pr];W[pq];B[ps];W[sq];B[sr];W[ss];B[qs])
(;B[sr];W[sq];B[pr];W[qs];B[pq];W[ss]))

       
advanced: black to play
{"filetype": "problem", "autocrop": true}
(;FF[4]GM[1]SZ[19]AP[SGFC:1.16]AB[qr][qq][pp][op][np][mq][lp]
[kq]AW[mp][mo][nn][qp][qo][nq][oq][pq]
(;B[nr];W[mr];B[lq];W[or];B[os];W[ns];B[ps])
(;B[pr];W[mr];B[lq];W[nr];B[lr];W[po]))

       
expert: black to play
{"filetype": "problem", "autocrop": true}
(;FF[4]GM[1]SZ[19]AP[SGFC:1.16]AW[qb][rb][pc][pd][pe][oe][mf]
[nf][lf][ke][kd][jc][jb][hb][hc][ka][nb][nd]AB[od][oc][ob][pb]
[mc][md][me][ne][kb][ib]
(;B[la];W[lb];B[ja];W[mb];B[lc];W[kc];B[nc])
(;B[lb];W[pa];B[nc];W[oa])
(;B[ma];W[nc];B[na];W[pa];B[mb];W[nc]))