Problem 2751 goproblems.com

Add / View flags +12


Author	WTD	Created	2003-07-22
Difficulty	23 kyu (history)	Source	wtd
AVG solve time	57 sec	Stars	3.7 (23 votes)
User attempts	10419 / 18614	Collections	Semeai / Capturing Race, Instruction Required, Fun, Basic Shape
Genre	life and death	Your attempts	N/A
Similar problems
Created	2003-07-22
Source	wtd
Stars	3.7 (23 votes)
Collections	Semeai / Capturing Race, Instruction Required, Fun, Basic Shape
Your attempts	N/A

(;AB[nl][ol][pl][ql][rl][sl][nm][ln][mn][lo][po][qo][ro][so][lp][op][pp][rp][sp][lq][oq][sq][lr][or][pr][sr][ls][os][ps][qs][rs][ss] AW[on][pn][qn][rn][sn][no][oo][np][nq][qq][nr][ns] LB[kk:T][ms:A] C[FORCE Either, tenuki at 'T' and then start the semeai at 'A'; or, start the semeai at 'A' allowing white to play 'T'.] (;B[ms]LB[kk:T] (;W[kk]C[RIGHT CHOICE The hana-roku (rabitty six) with vital point occupied is worth 11 dame internally, so both groups in the semeai had the same no. of dame at the start, and whoever plays first can win it. Black could not afford the tenuki, but he now has sente, whilst white has 13 ko threats.]) (;W[rq]LB[mr:A][kk:T]C[FORCE];B[mr]LB[kk:T];W[qp]LB[mq:A][kk:T]C[FORCE];B[mq]LB[kk:T];W[pq]LB[mp:A][kk:T]C[FORCE];B[mp]LB[kk:T] ;W[qr]LB[rr:A][kk:T]C[FORCE];B[rr]LB[kk:T];W[qq]LB[mo:A][kk:T]C[FORCE];B[mo]LB[kk:T];W[qp]LB[nn:A][kk:T]C[FORCE];B[nn]LB[kk:T] ;W[pq]LB[om:A][kk:T]C[FORCE];B[om]LB[kk:T];W[qr]LB[rq:A][kk:T]C[FORCE];B[rq]LB[kk:T];W[qq]LB[pm:A][kk:T]C[FORCE];B[pm]LB[kk:T] ;W[qp]LB[qm:A][kk:T]C[FORCE];B[qm]LB[kk:T];W[pq]LB[qr:A][kk:T]C[FORCE];B[qr]LB[kk:T];W[qq]LB[rm:A][kk:T]C[FORCE];B[rm]LB[kk:T];W[kk] C[RIGHT CHOICE The hana-roku (rabitty six) with vital point occupied is worth 11 dame internally, so both groups in the semeai had the same no. of dame at the start, and whoever plays first can win it. White has lost no points making sure of this, but has used up 12 ko threats.])) (;B[kk]LB[ms:A];W[rq]C[FORCE]LB[ms:A];B[ms];W[qp]C[FORCE]LB[mr:A];B[mr] ;W[pq]C[FORCE]LB[mq:A];B[mq];W[qr]C[FORCE]LB[rr:A];B[rr];W[qq]C[FORCE] LB[mp:A];B[mp];W[qp]C[FORCE]LB[mo:A];B[mo];W[pq]C[FORCE]LB[nn:A];B[nn];W[qr]C[FORCE] LB[rq:A];B[rq];W[qq]C[FORCE]LB[om:A];B[om];W[qp]C[FORCE]LB[pm:A];B[pm];W[pq]C[FORCE] LB[qr:A];B[qr];W[qq]C[FORCE]LB[qm:A];B[qm];W[qp]C[FORCE]LB[pq:A];B[pq];W[qq] C[White wins the corner. The hana-roku (rabbitty six) with vital point occupied, only needs 11 more internally unanswered white moves to capture. Black should have let white play at 'T'. Also, after the tenuki, black used 13 of the 14 ko threats he had.]))