Prokovich game

gaius · Post by **gaius** » Fri Nov 05, 2010 7:39 am

Move 7 in the first diagramme is a nice tesuji, but I still wonder if this is really bigger than one of the other moves that were suggested. Effectively, white has pierced black's moyo in sente now. As to the merit of the peep he played at move 113 - I am baffled... To me, it really feels like game over now.

The difference between the game move and the monkey jump is quite subtle. As for the next move, I considered 'b' and 'c', but I think the straightforward 'a' is best here. For those interested, I put some analysis in the hidden tag.

Click Here To Show Diagram Code: [go]$$Wcm116 $$ --------------------------------------- $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . X . . . . . X . . . . . . . | $$ | . . . . . X O X X X . . . . X . . . . | $$ | . . X , X O . . O O O . . . . , X . . | $$ | . a . . X O . O . . . . . . X . . X . | $$ | b c . X . X O . . . . . . . . . O . . | $$ | . 1 . X . X O . . . . . . . . . . . . | $$ | . . . X X . . . . . . . . . . . X O . | $$ | . O O O O O O O . O . . . . . . O . . | $$ | . X O O X X X X . , O . . . . , . O . | $$ | . X X X X . . . X . O X . . . X X O . | $$ | . . . . O . O . . . O . . . . . O . . | $$ | . O X X X O O X . X . . . . X O . . . | $$ | . . O . . . . X . . . . X . X X O . . | $$ | . . . O O O O X . . X . . . . O X . . | $$ | . . . O . X X O X . . O X . . O . . . | $$ | . . O X X . . O . X X O . X X . O . . | $$ | . . O . . . O . O O X . . X O O . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ ---------------------------------------[/go]

Okay, so: black's next move. White didn't jump so far, and you'd like to block as severely as possible. This'll lead to a ko:

Click Here To Show Diagram Code: [go]$$Wcm116 $$ --------------------------------------- $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . X . . . . . X . . . . . . . | $$ | . . . . . X O X X X a . . a X . . . . | $$ | . . X , X O . a O O O . . . . , X . . | $$ | 4 5 . . X O . O . . . . . . X . . X . | $$ | 3 2 7 X . X O . . . . . . . . . O . . | $$ | 6 1 8 X . X O . . . . . . . . . . . . | $$ | . . . X X . . . . . . . . . . . X O . | $$ | . O O O O O O O . O . . . . . . O . . | $$ | . X O O X X X X . , O . . . . , . O . | $$ | . X X X X . . . X . O X . . . X X O . | $$ | . . . . O . O a . . O . . . a . O . . | $$ | . O X X X O O X . X . . . . X O . . . | $$ | . . O . . . . X . . . . X . X X O . . | $$ | . . . O O O O X . . X . . . . O X . . | $$ | . . . O . X X O X . . O X . . O . . . | $$ | . . O X X . . O . X X O . X X . O . . | $$ | . . O . . . O . O O X . . X O O . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ ---------------------------------------[/go]

However, it's a bit of a flower-ko for white - if he loses it, he hasn't lost that much (and should get compensation from his ko threat), but if black loses it, he's kind of screwed. That means that white's ko threats don't need to be that big (for example, the points marked 'a' should do), but black has to make big threats. NOT what he wants.

This leaves us with two options - 'a' and 'b'.

Click Here To Show Diagram Code: [go]$$Wcm116 $$ --------------------------------------- $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . X . . . . . X . . . . . . . | $$ | . . . . . X O X X X . . . . X . . . . | $$ | . . X , X O . . O O O . . . . , X . . | $$ | . a . . X O . O . . . . . . X . . X . | $$ | b . . X . X O . . . . . . . . . O . . | $$ | . 1 . X . X O . . . . . . . . . . . . | $$ | . . . X X . . . . . . . . . . . X O . | $$ | . O O O O O O O . O . . . . . . O . . | $$ | . X O O X X X X . , O . . . . , . O . |[/go]

If, at some point, both sides then take their sente moves, the results will be:

Click Here To Show Diagram Code: [go]$$Wcm116 After move a - move 5=tenuki $$ --------------------------------------- $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . X . . . . . X . . . . . . . | $$ | . . . . . X O X X X . . . . X . . . . | $$ | . . X , X O . . O O O . . . . , X . . | $$ | 4 2 . . X O . O . . . . . . X . . X . | $$ | 3 6 . X . X O . . . . . . . . . O . . | $$ | 7 1 . X . X O . . . . . . . . . . . . | $$ | . . . X X . . . . . . . . . . . X O . | $$ | . O O O O O O O . O . . . . . . O . . | $$ | . X O O X X X X . , O . . . . , . O . |[/go]

and

Click Here To Show Diagram Code: [go]$$Wcm116 After move b $$ --------------------------------------- $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . X . . . . . X . . . . . . . | $$ | . . . . . X O X X X . . . . X . . . . | $$ | . . X , X O . . O O O . . . . , X . . | $$ | 6 4 . . X O . O . . . . . . X . . X . | $$ | 2 3 . X . X O . . . . . . . . . O . . | $$ | 5 1 . X . X O . . . . . . . . . . . . | $$ | . . . X X . . . . . . . . . . . X O . | $$ | . O O O O O O O . O . . . . . . O . . | $$ | . X O O X X X X . , O . . . . , . O . |[/go]

Black's territory along the edge is equal in both cases. BUT, in the second diagramme, white has an extra stone on the second line that is causing black a little pain in the backside. This makes a difference of 1 point. Therefore, I think move 'a' is best.

dfan · Post by **dfan** » Sat Nov 06, 2010 8:55 am

Click Here To Show Diagram Code: [go]$$Bcm117 ACTUAL GAME: Move 117. Points from prisoners: B 2 $$ --------------------------------------- $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . X . . . . . X . . . . . . . | $$ | . . . . . X O X X X . . . . X . . . . | $$ | . . X , X O . . O O O . . . . , X . . | $$ | . . . . X O . O . . . . . . X . . X . | $$ | . 1 . X . X O . . . . . . . . . O . . | $$ | . O . X . X O . . . . . . . . . . . . | $$ | . . . X X . . . . . . . . . . . X O . | $$ | . O O O O O O O . O . . . . . . O . . | $$ | . X O O X X X X . , O . . . . , . O . | $$ | . X X X X . . . X . O X . . . X X O . | $$ | . . . . O . O . . . O . . . . . O . . | $$ | . O X X X O O X . X . . . . X O . . . | $$ | . . O . . . . X . . . . X . X X O . . | $$ | . . . O O O O X . . X . . . . O X . . | $$ | . . . O . X X O X . . O X . . O . . . | $$ | . . O X X . . O . X X O . X X . O . . | $$ | . . O . . . O . O O X . . X O O . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ ---------------------------------------[/go]

dfan · Post by **dfan** » Sun Nov 07, 2010 8:19 am

Click Here To Show Diagram Code: [go]$$Wcm118 ACTUAL GAME: Move 118. Points from prisoners: B 2 $$ --------------------------------------- $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . X . . . . . X . . . . . . . | $$ | . . . . . X O X X X . . . . X . . . . | $$ | . . X , X O . . O O O . 1 . . , X . . | $$ | . . . . X O . O . . . . . . X . . X . | $$ | . X . X . X O . . . . . . . . . O . . | $$ | . O . X . X O . . . . . . . . . . . . | $$ | . . . X X . . . . . . . . . . . X O . | $$ | . O O O O O O O . O . . . . . . O . . | $$ | . X O O X X X X . , O . . . . , . O . | $$ | . X X X X . . . X . O X . . . X X O . | $$ | . . . . O . O . . . O . . . . . O . . | $$ | . O X X X O O X . X . . . . X O . . . | $$ | . . O . . . . X . . . . X . X X O . . | $$ | . . . O O O O X . . X . . . . O X . . | $$ | . . . O . X X O X . . O X . . O . . . | $$ | . . O X X . . O . X X O . X X . O . . | $$ | . . O . . . O . O O X . . X O O . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ ---------------------------------------[/go]

dfan · Post by **dfan** » Sun Nov 07, 2010 2:39 pm

I'm just going to finish this off:

Click Here To Show Diagram Code: [go]$$Bcm119 ACTUAL GAME: Moves 119-120. Points from prisoners: B 2 $$ --------------------------------------- $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . X . . . . . X . . . . . . . | $$ | . . . . . X O X X X . . 1 . X . . . . | $$ | . . X , X O . . O O O . O . . , X . . | $$ | . . . . X O . O . . . . . . X . . X . | $$ | . X . X . X O . . . . . . . . . O . . | $$ | . O . X . X O . . . . . 2 . . . . . . | $$ | . . . X X . . . . . . . . . . . X O . | $$ | . O O O O O O O . O . . . . . . O . . | $$ | . X O O X X X X . , O . . . . , . O . | $$ | . X X X X . . . X . O X . . . X X O . | $$ | . . . . O . O . . . O . . . . . O . . | $$ | . O X X X O O X . X . . . . X O . . . | $$ | . . O . . . . X . . . . X . X X O . . | $$ | . . . O O O O X . . X . . . . O X . . | $$ | . . . O . X X O X . . O X . . O . . . | $$ | . . O X X . . O . X X O . X X . O . . | $$ | . . O . . . O . O O X . . X O O . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ ---------------------------------------[/go]

Click Here To Show Diagram Code: [go]$$Bcm121 ACTUAL GAME: Moves 121-130. Points from prisoners: B 2 $$ --------------------------------------- $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . X . . . . . X . . . . . . . | $$ | . . . . . X O X X X . . X . X . . . . | $$ | . . X , X O . . O O O . O 9 . , X . . | $$ | . . . . X O . O . . . 8 7 . X . . X . | $$ | . X . X . X O . . . . . . . . . O 3 . | $$ | . O . X . X O . . . . . O . . . . 4 . | $$ | . . . X X . . . . . . . . . . . X O . | $$ | . O O O O O O O . O . . . . . . O . . | $$ | . X O O X X X X . , O . . . . , . O . | $$ | . X X X X . . . X . O X . 0 . X X O . | $$ | . . . . O . O . . . O . . . . 5 O . . | $$ | . O X X X O O X . X . . . . X O 6 . . | $$ | . . O . . . . X . . . . X . X X O . . | $$ | . . . O O O O X . . X . . . . O X . . | $$ | . . . O . X X O X . . O X . . O 2 . . | $$ | . . O X X . . O . X X O . X X 1 O . . | $$ | . . O . . . O . O O X . . X O O . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ ---------------------------------------[/go]

Click Here To Show Diagram Code: [go]$$Bcm131 ACTUAL GAME: Moves 131-140. Points from prisoners: B 2 $$ --------------------------------------- $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . X . . . . 9 X . . . . . . . | $$ | . . . . . X O X X X 8 . X . X . . . . | $$ | . . X , X O . . O O O . O X . , X . . | $$ | . . . . X O . O . . . O X . X . . X . | $$ | . X . X . X O . . . . . . . . . O X . | $$ | . O . X . X O . . . . . O . . . . O . | $$ | . . . X X . . . . . . . . . . 5 X O . | $$ | . O O O O O O O . O . . . 2 . 1 O 4 . | $$ | . X O O X X X X . , O . . . . , 3 O . | $$ | . X X X X . . . X . O X . O . X X O . | $$ | . . . . O . O . . . O . 0 . . X O . . | $$ | . O X X X O O X . X . . . . X O O . . | $$ | . . O . . . . X . . . . X . X X O . . | $$ | . . . O O O O X . . X . . . . O X . . | $$ | . . . O . X X O X . . O X . . O O . . | $$ | . . O X X . . O 6 X X O . X X X O . . | $$ | . . O . . . O . O O X . . X O O . . . | $$ | . . . . . . . . . . 7 . . . . . . . . | $$ ---------------------------------------[/go]

Black resigned after move 140.

This was the third game of the 29th Oza title match in 1981; Black was Kato Masao and White was Hashimoto Shoji. The game can be found in Go World #27.

Thanks for playing along!

tj86430 · Post by **tj86430** » Sun Nov 07, 2010 3:13 pm

Thank you for doing this. I really enjoyed it.

I'm surprised by two things:
1) black didn't resign earlier
2) black was Masao Kato

phrax · Post by **phrax** » Mon Nov 08, 2010 5:36 am

Thanks a lot for doing this. It was quite enjoyable (I think I even learned something too).

gaius · Post by **gaius** » Mon Nov 08, 2010 5:54 am

Yep, it was good stuff!

Are people interested in a second Prokovich game? If so, I'd be willing to run the next one. I found a nice pro-game for that purpose this weekend

.

tj86430 · Post by **tj86430** » Mon Nov 08, 2010 6:02 am

gaius wrote:Are people interested in a second Prokovich game? If so, I'd be willing to run the next one. I found a nice pro-game for that purpose this weekend .

I believe a second one is already running, but I'd welcome a third one as well.

gaius · Post by **gaius** » Mon Nov 08, 2010 6:42 am

tj86430 wrote:
gaius wrote:Are people interested in a second Prokovich game? If so, I'd be willing to run the next one. I found a nice pro-game for that purpose this weekend .

I believe a second one is already running, but I'd welcome a third one as well.

Ah yes, I missed that. Thanks for the info! In that case, I'll wait with the third one. Better to have only one running at the same time.

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