# OD1P - May 23 Problem / Solution

Sub-page of OD1PMay23Problem

### Summary

Anonymous summary...

IT'S ALIVE

Black lives (without ko.)

Bad for white (can't play at a)
3 is Tesuji

Best for white. If at , then at . If at a, then black makes life with , (although he might make bigger life with ?)

Inferior 4 ( at )

Trying to kill only lets black get bigger life.

saves the day again. at transposes to our previous line. If at , then at makes and a miai.

Double ko

Even if white has infinite ko threats, black is alive. White never gets a chance to fill a, because black can always take one of the kos, and thus threatening to make unconditional life by taking the other.

Ko

Black makes a ko for life.

Ko (not small)

captures This is (probably?) the best way for black to play after .

Ko (continued)

Black takes first.

is too greedy

This fails, since at kills.

o_O

I am unsure how white counters this . a, b, c, and d are possibilities. After other moves, black makes life with d.

and are sente, takes the vital point.

This dies too
Bulky five, so dies
This seems to transpose into other lines...?

### This might work

Black lives, I hope...

Black lives.

I think this would be white's response...

This looks like black dies... the real solution is at the 2-2 point, as shown below? --Anon

Black dies.

### Failure 2 (Ko - Black can do better)

Failure 2 (Ko)

takes at . Next:

Failure 2 (continued)

takes back, and after and a ko fight ensues. Black can do better than that.

takes at , at 2.
Bill: The writer was under the misapprehension that could be played at 2. The corrected sequence shows that Black dies.

Or? (4 at 2, 7 at )

Or? (Corrected.)

fills at .
Bill: Through Black lives, but is an error.

Attempt 3

Atari

Bill: looks OK.
Then - is sente.
In a real game, I think that the ko (Failure 2) is often better than giving up so much for small life. :-)

Double ko

Here is a variation I like. Black is alive in double ko.

was a real blind spot for me. I had then expected here, and Black still lives.

Solution 3

OD1P - May 23 Problem / Solution last edited by 76.197.255.180 on January 22, 2008 - 01:51