Problem 3523 goproblems.com


Author	santa c	Created	2003-12-12
Difficulty	8 dan (history)	Source	http://senseis.xmp.net/?Aug9Problem
AVG solve time	50 sec	Stars	4.38 (8 votes)
User attempts	143 / 1691	Collections	Corner based, Irregular Tesuji, Double Ko
Genre	life and death ⓒ	Your attempts	N/A
Similar problems
Created	2003-12-12
Source	http://senseis.xmp.net/?Aug9Problem
Stars	4.38 (8 votes)
Collections	Corner based, Irregular Tesuji, Double Ko
Your attempts	N/A

(;AB[sq]AB[rq]AW[qq]AW[pr]AB[qp]AB[pp]AB[op]AB[np]AB[oq]AB[or]AW[nr]AW[nq]AW[lq]AW[mp]AW[mo]AW[no]AW[oo]AW[qn]AW[ro]AW[rp]AW[ql]AW[jq]C[Black moves -> Black lives unconditionaly, with all of his stones, no? ;)FORCE]AP[goproblems] (;B[pq];W[os] (;B[ps];W[qs]C[FORCE] (;B[rs];W[rr]C[FORCE] (;B[sr]C[Bravo! ;) (Life in double ko)RIGHT]) (;B[ss];W[sr]C[Black's dead!])) (;B[qr];W[rs]C[FORCE] (;B[ps]MA[pr]C[Ko.. Could be better..]) (;B[rr];W[ps]C[Black's dead!]) (;B[sr];W[ps]C[Black's dead!]) (;B[ss];W[ps]C[Black's dead!]) (;B[qq];W[ps]C[Black's dead!])) (;B[rr];W[ps]C[Black's dead!]) (;B[sr];W[ps]C[Black's dead!]) (;B[ss];W[ps]C[Black's dead!])) (;B[qr];W[ps]C[Black's dead!]) (;B[qs];W[ps]C[Black's dead!] (;B[qr];W[ns]C[Black's dead!]) (;B[rr];W[ns]C[FORCE] (;B[qr];W[ss]C[Black's dead!]) (;B[rs]C[Black's dead!]) (;B[sr]C[Black's dead!]) (;B[ss];W[qr]C[Black's dead!])) (;B[sr];W[qr]C[Black's dead!]) (;B[rs];W[qr]C[Black's dead!]) (;B[ss];W[qr]C[Black's dead!])) (;B[rr];W[ps]C[Black's dead!]) (;B[rs];W[ps]C[Black's dead!]) (;B[sr];W[ps]C[Black's dead!]) (;B[ss]C[Black's dead!];W[ps]C[Black's dead!])) (;B[qr];W[os]C[FORCE] (;B[pq];W[ps]C[Black's dead!]) (;B[rs];W[ps]C[FORCE] (;B[sr];W[pq]C[FORCE] (;B[qs]C[Black lives with half of his group...]) (;B[ss]C[Black's dead!]) (;B[rr]C[Black's dead!])) (;B[pq];W[sr]C[Black's dead!]) (;B[rr]C[Black's dead!]) (;B[qs];W[sr]C[Black's dead!]) (;B[ss]C[Black's dead!])) (;B[ps];W[qs]C[];B[rs];W[rr];B[sr];W[ss]C[A 2 step ko. Not bad but black has something better.]) (;B[qs];W[ps]C[FORCE] (;B[pq];W[ns]C[Black's dead!]LB[rr:A]LB[ss:B]) (;B[rr];W[ss]C[Black's dead!]) (;B[ss];W[rr]C[Black's dead!]) (;B[rs];W[sr]C[Black's dead!]) (;B[sr];W[rs]C[Black's dead!])) (;B[rr];W[qs]C[Black's dead!]) (;B[sr];W[qs]C[Black's dead!]) (;B[ss];W[qs]C[Black's dead!])) (;B[ps];W[rr]C[Black's dead!]) (;B[qs];W[ps]C[FORCE] (;B[os];W[rr]C[FORCE] (;B[qr];W[rs]C[FORCE] (;B[qr];W[qs]C[FORCE] (;B[pq];W[sp]C[FORCE] (;B[qr]MA[qq]C[Ko.. And even though black takes first, unconditional life's better.. (Thanks Spirit)];W[qq]C[NOTTHIS]) (;B[sr];W[ss]C[Black's dead!]) (;B[ss];W[sr]C[Black's dead!])) (;B[sr];W[sp]C[Black's dead!]) (;B[ss];W[sp]C[Black's dead!])) (;B[pq];W[qr]C[Black's dead!]) (;B[qs];W[qr]C[Black's dead!]) (;B[sr];W[sp]C[Black's dead!]) (;B[ss];W[sp]C[Black's dead!])) (;B[pq];W[qr]C[FORCE] (;B[rs];W[ss]C[Black's dead!]) (;B[sr];W[rs]C[Black's dead!]) (;B[ss];W[sp]C[Black's dead!])) (;B[rs];W[sr]C[Black's dead!]) (;B[ss];W[sr]C[Black's dead!]) (;B[sr];W[sp]C[Black's dead!])) (;B[ns];W[rr]C[Black's dead!]) (;B[pq];W[os]C[FORCE] (;B[qr];W[ns]C[Black's dead!]) (;B[rr];W[ns]C[FORCE] (;B[qr];W[ss]C[Black's dead!]) (;B[rs]C[Black's dead!]) (;B[sr]C[Black's dead!]) (;B[ss];W[qr]C[Black's dead!])) (;B[sr];W[qr]C[Black's dead!]) (;B[rs];W[qr]C[Black's dead!]) (;B[ss];W[qr]C[Black's dead!])) (;B[qr];W[os]C[FORCE] (;B[pq];W[ns]C[Black's dead!]LB[rr:A]LB[ss:B]) (;B[rr];W[ss]C[Black's dead!]) (;B[rs];W[sr]C[Black's dead!]) (;B[sr];W[rs]C[Black's dead!]) (;B[ss];W[rr]C[Black's dead!])) (;B[rr];W[os]C[FORCE] (;B[pq];W[ss]C[Black's dead!]) (;B[qr];W[ss]C[Black's dead!]) (;B[rs]C[Black's dead!FORCE]) (;B[ss];W[qr]C[Black's dead!]) (;B[sr]C[Black's dead!])) (;B[rs];W[os]C[FORCE] (;B[pq];W[qr]C[Black's dead!]) (;B[qr];W[sr]C[Black's dead!]) (;B[rr]C[Black's dead!]) (;B[sr];W[qr]C[Black's dead!]) (;B[ss]C[Black's dead!])) (;B[sr];W[os]C[FORCE] (;B[pq];W[qr]C[Black's dead!]) (;B[qr];W[rs]C[Black's dead!]) (;B[rr]C[Black's dead!]) (;B[rs];W[qr]C[Black's dead!]) (;B[ss]C[Black's dead!])) (;B[ss];W[os]C[FORCE] (;B[pq];W[qr]C[Black's dead!]) (;B[qr];W[rr]C[Black's dead!]) (;B[rs]C[Black's dead!]) (;B[rr];W[qr]C[Black's dead!]) (;B[sr]C[Black's dead!]))) (;B[os];W[rr]C[Black's dead!FORCE]) (;B[ns];W[rr]C[Black's dead!FORCE]) (;B[rr];W[os]C[FORCE] (;B[pq];W[ps]C[Black's dead!]) (;B[qr];W[ps]C[Black's dead!]) (;B[qs];W[ps]C[Black's dead!] (;B[pq];W[ss]C[Black's dead!]) (;B[qr];W[ss]C[Black's dead!]) (;B[rs]C[Black's dead!FORCE]) (;B[ss];W[qr]C[Black's dead!]) (;B[sr]C[Black's dead!])) (;B[ps];W[qs]C[Black's dead!]) (;B[rs]C[Black's dead!]) (;B[sr]C[Black's dead!]) (;B[ss];W[qs]C[Black's dead!])) (;B[rs];W[rr]C[FORCE] (;B[ns];W[sr]C[Black's dead!]) (;B[os];W[sr]C[Black's dead!]) (;B[ps];W[sr]C[Black's dead!]) (;B[qs];W[sr]C[Black's dead!]) (;B[pq];W[qr]C[Black's dead!]) (;B[sr];W[qr] (;B[ns];W[sp]C[Black's dead!]) (;B[os];W[sp]C[Black's dead!]) (;B[ps];W[sp]C[Black's dead!]) (;B[qs];W[sp]C[Black's dead!]) (;B[pq];W[sp]C[Black's dead!]) (;B[ss]C[Black's dead!])) (;B[qr];W[qs]C[FORCE] (;B[pq];W[qr]C[FORCE] (;B[sr];W[ss]MA[rs]C[Ko.. And white takes first..]) (;B[ps];W[ss]C[Black's dead!]) (;B[ss];W[sp]C[Black's dead!]) (;B[os];W[sp]C[Black's dead!])) (;B[ss]C[Black's dead!]) (;B[ps];W[sp]C[Black's dead!]) (;B[os];W[sr]C[Black's dead!]) (;B[sr];W[ss]MA[rs]C[Ko.. And white takes first! (Thanks, BartTM)])) (;B[ss];W[sp]C[Black's dead!])) (;B[sr];W[os]C[FORCE] (;B[pq];W[ps]C[Black's dead!]) (;B[qr];W[ps]C[Black's dead!]) (;B[ps];W[qs]C[Black's dead!]) (;B[qs];W[ps]C[Black's dead!] (;B[pq];W[qr]C[Black's dead!]) (;B[qr];W[rs]C[Black's dead!]) (;B[rr]C[Black's dead!]) (;B[rs];W[qr]C[Black's dead!]) (;B[ss]C[Black's dead!])) (;B[rr]C[Black's dead!]) (;B[rs];W[ps]C[Black's dead!]) (;B[ss]C[Black's dead!])) (;B[ss];W[os]C[FORCE] (;B[pq];W[ps]C[Black's dead!]) (;B[qr];W[ps]C[Black's dead!]) (;B[qs];W[ps]C[Black's dead!] (;B[pq];W[qr]C[Black's dead!]) (;B[qr];W[rr]C[Black's dead!]) (;B[rs]C[Black's dead!]) (;B[rr];W[qr]C[Black's dead!]) (;B[sr]C[Black's dead!])) (;B[ps];W[qs]C[Black's dead!]) (;B[rr]C[Black's dead!];W[qs]C[Black's dead!]) (;B[rs]C[Black's dead!]) (;B[sr]C[Black's dead!])))