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Date: Sun, 20 Jun 93 16:13:23 -0400
From: smg6@po.CWRU.Edu (S. Max Golem)
To: smg6@thor.INS.CWRU.Edu
Subject: Re:  Discussion problem 2.
Reply-To: smg6@po.CWRU.Edu (S. Max Golem)



Hi gang --

David Mechner has some thoughts on the discussion problem that
Huayong Yang sent to us>

>
>>Here is a question about a position that I ran into several times.
>>I don't know what the correct play is yet.
>>
>>This position is shown in the following diagram:
>>
>>   A B C D E F G H J K L M N O P Q R S T
>>19 . . . . . . . . . . . . . . . . . . . 19
>>18 . . O . . . . . . . . . . . . O . . . 18
>>17 . # # O . . . . . . O . . O . . # . . 17
>>16 . . . . O . . . . . . . . . . # . . . 16
>>15 . . # . . . . . . . . . . . . . . . . 15
>>14 . . . . O . . . . . . . . . . # . . . 14
>>13 . . . . . . . . . . . . . . . . . . . 13
>>12 . . # . . . . . . . . . . . . . O . . 12
>>11 . . . . . . . . . . . . . . . . . . . 11
>>10 . . . . . . . . . . . . . . . . # . . 10
>> 9 . . O . . . . . . . . . . . . . . . .  9
>> 8 . . . . . . . . . . . . . . . . . . .  8
>> 7 . . . . . . . . . . . . . . . . . . .  7
>> 6 . . O . . . . . . . . . . . . O O . .  6
>> 5 . . . . . . . . . . . . . . O . # . .  5
>> 4 . . . O . . . . . . . . . # . . # . .  4
>> 3 . . O . . # . . # . . . . . . # . . .  3
>> 2 . . . # . . . . . . . . . . . . . . .  2
>> 1 . . . . . . . . . . . . . . . . . . .  1
>>   A B C D E F G H J K L M N O P Q R S T
>>
>>Focus is on the right side where white R12 invades.
>>(It is the position on the upper-right that I ran into sometimes.)
>>My question is,
>>what's the correct play for black?  Of course, the answer may be
>>dependent on the stones nearby.

[DM]

>It's definitely dependent on the stones nearby.  In the diagram above, it
>seems to me that W r12 is an overplay -- white's r6 group is not settled
>and has sort of heavy shape.  I'd be tempted to play the diagonal attack
>of q10 for black, then as white lives black will gain thickness facing the
>bottom, and things will be bad for the r6 group.  But just attaching at
>q12 is probably fine too, or maybe better -- anything that seals white in
>and gets some thickness for black should make the game uncomfortable for
>white.
>
>Something like this might follow the diagonal play:
>
>   A B C D E F G H J K L M N O P Q R S T
>19 . . . . . . . . . . . . . . . . . . . 19
>18 . . O . . . . . . . . . . . . O . . . 18
>17 . # # O . . . . . . O . . O . . # . . 17
>16 . . . . O . . . . . . . . . . # . 12. 16
>15 . . # . . . . . . . . . . . . . . . . 15
>14 . . . . O . . . . . . . . . . # . 10. 14
>13 . . . . . . . . . . . . . . 11. . . . 13
>12 . . # . . . . . . . . . . . 3 2 O . . 12
>11 . . . . . . . . . . . . . . . 1 . 6 . 11
>10 . . . . . . . . . . . . . . . . # 4 . 10
> 9 . . O . . . . . . . . . . . . 7 9 5 .  9
> 8 . . . . . . . . . . . . . . . . 8 . .  8
> 7 . . . . . . . . . . . . . . . . . . .  7
> 6 . . O . . . . . . . . . 13. . O O . .  6
> 5 . . . . . . . . . . . . . . O . # . .  5
> 4 . . . O . . . . . . . . . # . . # . .  4
> 3 . . O . . # . . # . . . . . . # . . .  3
> 2 . . . # . . . . . . . . . . . . . . .  2
> 1 . . . . . . . . . . . . . . . . . . .  1
>   A B C D E F G H J K L M N O P Q R S T
>
>and it's hard to see what white would do on the attachment except maybe
>play desperately:
>
>   A B C D E F G H J K L M N O P Q R S T
>19 . . . . . . . . . . . . . . . . . . . 19
>18 . . O . . . . . . . . . . . . O . . . 18
>17 . # # O . . . . . . O . . O . . # . . 17
>16 . . . . O . . . . . . . . . . # . . . 16
>15 . . # . . . . . . . . . . . . . . . . 15
>14 . . . . O . . . . . . . . . . # . . . 14
>13 . . . . . . . . . . . . . . 3 2 5 . . 13
>12 . . # . . . . . . . . . . . . 1 O . . 12
>11 . . . . . . . . . . . . . 8 . 4 6 . . 11
>10 . . . . . . . . . . . . . . . . # . . 10
> 9 . . O . . . . . . . . . . . . . . . .  9
> 8 . . . . . . . . . . . . . 9 . 7 . . .  8
> 7 . . . . . . . . . . . . . . . . . . .  7
> 6 . . O . . . . . . . . . 10. . O O . .  6
> 5 . . . . . . . . . . . . . . O . # . .  5
> 4 . . . O . . . . . . . . 11# . . # . .  4
> 3 . . O . . # . . # . . . . . . # . . .  3
> 2 . . . # . . . . . . . . . . . . . . .  2
> 1 . . . . . . . . . . . . . . . . . . .  1
>   A B C D E F G H J K L M N O P Q R S T
>
>But that's just another game.  
>
>-David


Thanks, David!