Ongoing Game 1 / Lower Left Yose

Black lives.  

Six must come before Eight. Eight can be delayed.

Black lives with a different move order.  

(By the way, these aren't very important sequences for those who can't mentally process eight moves at once.)

White starts strong...  

This last attack was really hard for me to read out because it's so...determined... (I might have misread something...) ((Coincidentally, these were the correct first moves for the normal long L Group with a Hane on the long side. It is slightly worse than the mainline because it's Gote.))

 

Black has A.

 

Where should White actually bend? The upper gap looks more attractive, but there could be some weird interaction going on here...

The Black Hanetsugi on the bottom gap was a "one point move". The game was using territory scoring! (Eww...)

 

Let's try this Hane first. Does Black need to respond?

 

Well... if Black plays elsewhere, White kills.

 

If Black tries mutual damage, White still kills. (The bottom was solidly enclosed by White at that point.)

 

If Black wants to live, he must block.

 

White can't kill anymore.

 

Making another Hane won't do much either.

 

This looks good for White but Black can make trouble with Six at Seven. (Also, White took Gote.) Here, the effect of White's first Hane is completely reversed.

 

White took Gote because she wasted a stone in the upper gap. Here, the remaining Aji forces Black to take fix his shape. (Two and Four threatened to escape.)

 

The situation has reversed. If White plays at A, Black plays at B. Position is even.

 

White must connect. Next, Black defended at a, but was that correct play?

 

Black can't play elsewhere. If he does, White makes Ko like this.

 

I would have played here though. (I don't want to end with an incorrect count, so I'll wait for someone else to refute my move if it's bad.)

Nevermind. I found it. White descends to A and threatens the same Ko. Black must defend and end in Gote.

 

This was my second try. It's still bad; White has the privilege of playing at B in Sente provoking a response at C. (Black can't bend at A.)

 

So, Black was right! Sente was important! Let me make the tree...

 

If White plays at A next, she kills nine stones and gets five points of territory.

 

If Black blocks, he gets five points and reverses.

 

If White connects at A, Black pushes and connects on the right.

 

White must connect again.
Let A be the position from the fifth diagram counting from the top of this text.
A
/ \
B -14
\Reversal
5
!
B=5
" "
A=5 A to B is practical Sente. A to Minus Fourteen is Sote. Sente has privilege over Sote. The corner is worth five points after White push.

 

Black can also block directly.

 

This is still a reversal. If White connects at A, Black bends at B.

 

Black's corner is already worth six points, but he only puts one White stone in Atari. So, the instant block is less likely to be practical Sente against an imperfect white player.

So far, none of White's plays have ended in Sente. White has no privilege. Does Black have privilege though?

 

You can't see it on the diagram( yet), but One goes inside an empty corridor. Black at A takes away the last potential point but White at A is another reversal.

 

If Black connects at A, White bends at B.

Two is White's privilege.  

Black ends in Gote as well. Neither side has privilege. If Black plays first, he gets seven points in the corner and shrinks White's corridor by one point. If White plays first, she gets two points in the corridor and shrinks Black's corner by one point.
7-1=6 6-2=4
Let A be the position above.
A
/ \
B C
\Reversal Privilege /Reversal Privilege
D E
/ \
6 4
((2-1)-(1-2))=(1--1)=2
I just saw the tree in the preview and it looks horrible! I can only imagine...
(6-4)÷2=2÷2=1
It's one point! Bill was right!
Now, we average the results...
(6+4)÷2=10÷2=5
Black has five points on average here!
We're close, but there is the white Hane in the lower gap( as first move).

I mean this.  

It's Sente! Black is reduced to the long L group!

 

This is still a reversal.

 

If White connects at A, Black returns to equity with B. C is also possible.

 

White must connect once again. Now, surprise! Black can't play elsewhere!

 

White's follow-ups are quite powerful guaranteeing a ten thousand year Ko or Seki. (We saw this before, near the beginning of the page. )Unfortunately, these are not quite as big as the direct Ko menace from the upper Hane.

 

Black can make mutual damage here. He yields more bottom gap.

 

Playing first as Black is easy. Take the Sente.

 

This is White's privilege of Sente over Gote. Corner is worth seven points.
A move here is worth one point at worst, but it's Double Sente, so it could be worth so much more... We don't know for sure because it involves complications on the right side.