Problems (why is it wrong)

[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.]))

[Uberdude]

I'm confused. What is the problem's task? Black to play and lose? Both variations white achieves that.

[logan]

2nd variation is correct, White saves a ko threat. If your source says otherwise, it's made a mistake.

[palapiku]

Also very confused about why black plays first...

[SuprunP]

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.

[illluck]

I'm still confused. Doesn't black E19 also work in response to E18?

[SuprunP]

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.

[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