Re: [gnugo-devel] Eye pattern 304

[SP LEE]

Hi,
I just got the patched program and I found that M6 is a very good attacking 
move. White has to defend at L6. After this GNUGO played H2, which is also a 
good defend position for the lower side group. Now GNUGO is in a good 
position to attack the white group.

If GNUGO defended first, white might have the chance to make a better shape 
around L6.

SP Lee

> From: <address@hidden>
> Reply-To: GNU Go development <address@hidden>
> To: GNU Go development <address@hidden>
> CC: address@hidden
> Subject: Re: [gnugo-devel] Eye pattern 304
> Date: Fri, 9 May 2003 06:59:37 -0700
>
> About the patch paul_3_20.5, which is the one discussed in
> this thread, I think the patch was supposed to address the
> position at move 62 in the game of S.P. Lee.
>
> But both before and after the patch, GNU Go currently
> wants to play at M6, not J2.
>
> J2 is valued 49.38 points and has this move reason:
>
>   J2: owl attack/defend for G2
>   J2: owl attack/defend for N3
>   J2: 45.39 - change in territory
>   J2: 1.81 - strategic effect on H5
>   J2:   25.02 - N3 strategic value already counted - B.
>   J2:   5.22 - G2 strategic value already counted - A.
>   J2:   4.34 - total followup value, added 4.34 as territorial followup
>   J2: 2.17 - added due to followup (4.34) and reverse followup values 
> (0.00)
> Move generation values J2 to 49.37
>
> M6 is valued 83.05 points:
>
>   M6: owl attack/defend for N3
>   M6: owl attack/defend for L5
>   M6: 79.96 - change in territory
>   M6: 0.18 - strategic effect on J6
>   M6: 0.85 - strategic effect on O5
>   M6:   12.62 - N3 strategic value already counted - B.
>   M6:   4.13 - total followup value, added 4.13 as territorial followup
>   M6: 2.07 - added due to followup (4.13) and reverse followup values 
> (0.00)
> Move generation values M6 to 83.05
>
> ----------------------------------
>
> This is after Paul's patch. Before the patch:
>
>   J2: owl attack/defend for G2
>   J2: 8.96 - change in territory
>   J2: 1.81 - strategic effect on H5
>   J2:   6.42 - G2 strategic value already counted - A.
>   J2:   1.83 - total followup value, added 1.83 as territorial followup
>   J2: 2.92 - added due to followup (1.83) and reverse followup values 
> (4.00)
> Move generation values J2 to 13.69
>
>   M6: owl attack/defend for L5
>   M6: 43.11 - change in territory
>   M6: 0.18 - strategic effect on J6
>   M6: 0.85 - strategic effect on O5
>   M6: 10.56 - strategic effect on N3
>   M6:   2.60 - total followup value, added 2.60 as territorial followup
>   M6: 1.30 - added due to followup (2.60) and reverse followup values 
> (0.00)
> Move generation values M6 to 55.99
>
> ----------------------------------
>
> Since GNU think's L5 is critical, this position should be
> considered a semeai. Of course W has much more space than
> B, so B should defend.
>
> I suppose we should use Paul's patch and also add this
> game as a regression.
>
> Dan
>
>
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> gnugo-devel mailing list
> address@hidden
> http://mail.gnu.org/mailman/listinfo/gnugo-devel

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