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Problems (why is it wrong)
Posted: Sat Mar 02, 2013 12:26 pm
by SuprunP
Hi everyone.
This is one of the problems I've been going through recently.
Would you be so kind to explain to me why one particular variant is marked as 'wrong'?
Thanks.
(;GM[1]FF[4]CA[UTF-8]AP[CGoban:3]ST[2]
RU[Japanese]SZ[19]KM[6.50]
PW[White]PB[Black]AW[ca][fa][cb][fb][cc][dc][fc][bd][ed][fd][be][ce][cg]AB[ba][ga][bb][eb][gb][bc][gc][cd][dd][gd][de][ee][fe][ge]TR[eb]
;W[ec]
;B[da]
;W[ac]
;B[db]
;W[ea]
;B[db]
;W[ab]
;B[da]
(;W[eb]C[This is marked as a correct variant.]
;B[db]
;W[aa])
(;W[aa]C[This is marked as a wrong variant.]))
Re: Problems (why is it wrong)
Posted: Sat Mar 02, 2013 12:53 pm
by Uberdude
I'm confused. What is the problem's task? Black to play and lose? Both variations white achieves that.
Re: Problems (why is it wrong)
Posted: Sat Mar 02, 2013 12:54 pm
by logan
2nd variation is correct, White saves a ko threat. If your source says otherwise, it's made a mistake.
Re: Problems (why is it wrong)
Posted: Sat Mar 02, 2013 1:15 pm
by palapiku
Also very confused about why black plays first...
Re: Problems (why is it wrong)
Posted: Sat Mar 02, 2013 1:26 pm
by SuprunP
Uberdude wrote:I'm confused. What is the problem's task? Black to play and lose? Both variations white achieves that.
I should have presented it slightly differently. E18 was marked, as if it were where Black had just played. Corrected.
Re: Problems (why is it wrong)
Posted: Sat Mar 02, 2013 3:41 pm
by illluck
I'm still confused. Doesn't black E19 also work in response to E18?
Re: Problems (why is it wrong)
Posted: Sat Mar 02, 2013 4:16 pm
by SuprunP
illluck wrote:I'm still confused. Doesn't black E19 also work in response to E18?
This is another solution to the problem which, I'd think, has little in common with the original question.

Re: Problems (why is it wrong)
Posted: Sat Mar 02, 2013 4:58 pm
by illluck
Generally questions with more than one solution for first move are considered bad. In other words, the answer to both my question and yours is the same - I just wasn't sure if the question was indeed that terrible :p