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Re: Fran's Life and Death Problem #136.. Can you solve it?
Posted: Sat May 02, 2015 1:10 pm
by Joaz Banbeck
I forget which pro it was who said something like 'When in doubt about corner life...
...start your reading with the 1-2 and 2-1 points'. When I asked why that was, he said that it was an efficiency issue: those two points enclose the only eye that requires only three surrounding stones. All other eyes require more.
Re: Fran's Life and Death Problem #136.. Can you solve it?
Posted: Sat May 02, 2015 2:49 pm
by Bki
Joaz Banbeck wrote:I forget which pro it was who said something like 'When in doubt about corner life...
...start your reading with the 1-2 and 2-1 points'. When I asked why that was, he said that it was an efficiency issue: those two points enclose the only eye that requires only three surrounding stones. All other eyes require more.
He is not in pro, but,
In his book (in French) Tsumego, Motoki Noguchi emphasize quite a bit how important the 1-2 points are in the corner. Not only because of it's the best point to make an eye, but also because it's also the best point to set a ko, and a descent to the 1-2 point will require an approach move by your opponent.
The 1-2 point is like, the second move I check after the hane and obvious vital points for an eye.
Re: Fran's Life and Death Problem #136.. Can you solve it?
Posted: Sat May 02, 2015 4:40 pm
by jeromie
I did get it. It's encouraging when I can solve tsumego I "should" be able to figure out.
In addition to the advice above:
When I notice a semi-symmetrical problem where one group has more liberties than the other, I generally try a move that reinforces the group that is short of liberties first. That gave me a good idea of which 1-2 point was likely to be correct before I started reading.
Re: Fran's Life and Death Problem #136.. Can you solve it?
Posted: Sun May 03, 2015 10:47 am
by PeterN
Heh, the answer I got when asking some better players about the 1-2 points was generally along the lines of "Because they're magic." That's the first time I've actually seen a proper reasoning for it.
PeterN
Re: Fran's Life and Death Problem #136.. Can you solve it?
Posted: Sun May 03, 2015 11:41 am
by Cassandra
The 2-1-points might become vital ...
$$ Bulky Five I $$ | . . . . . . . . . $$ | . . . . . . . . . $$ | . . . . . . . . . $$ | . X X . . . . . . $$ | . O X . . . . . . $$ | T O X . X . . . . $$ | M T O O X . . . . $$ | T T . . . . . . . $$ - - - - - - - - - -
It's encouraging when I can solve tsumego I "should" be able to figure out.
That's the first time I've actually seen a proper reasoning for it.