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\vglue-5pt
\hbox{
\vbox{\hsize=3in\vglue10pt\hbox{\epsffile{figure2.1.eps}}
\hbox{\hsize=3in{\bf Figure 2.} An OWL variation.}}\hglue.65in
\vbox{\hsize=200pt\tolerance=10000
GNU Go's OWL code takes 639 variations to conclude that G16 can be attacked at
E14, and 409 variations to conclude that it can be defended at G13. A human
player would look at far fewer variations but probably come to the
same conclusion. A typical variation considered by GNU Go is given at
left.

B 60. Strange shape. Simply extending to 61 would be the ordinary move.

W 63. W should simply live at 65 or 66.

W 71. Unfortunately W does not really have sente.

B 80. Good.

B 90. The top is more urgent.

W 91. W should live at 92.

B 94. Better at 99 for a simple resolution.

B 106. Better at S19 to avoid ko.

W 107. If W plays at S19, he gets a ko.

After 108, W resigns.
}}

\bigbreak
\hbox{\vbox{\hsize=1.15in\vglue 2in\noindent{\bf Figure 3.} 57--108.
B 70 connects.
}
\vbox{\epsffile{figure3.1.eps}}}
\medbreak

\bigbreak
\centerline{\hglue-20pt\epsffile{figure4.1.eps}}
\medbreak
\centerline{{\bf Figure 4}. 1-155. 93 at 75, 96 at 90, 99 at 75 and 144 at 31.}

\bigbreak
Figure 4 shows another game. GNU Go played poorly until move 156,
then came to life.

{\parskip=8pt
B 26. Must be at B15.

B 42. Even in isolation this is bad. B must connect at K5.

B 60. Bad tenuki.

B 80. Having played well on the bottom, B must continue at L2.

B 92. Pointless.

B 102. Due to an OWL mistake, B thinks the corner is alive. It can of
course be attacked at S1. B sees that R1 threatens O1, and due to
a missing pattern believes there is another half eye around O5.

B 120 and 126. Pointless moves.

By move 155 W must think he has a won game.
}

\bigbreak
\centerline{\hglue-20pt\epsffile{figure5.1.eps}}
\medbreak
\centerline{{\bf Figure 5}. 156--168. B defends the center group by attacking.}

\bigbreak

\centerline{\hglue-20pt\epsffile{figure6.1.eps}}
\medbreak
\centerline{{\bf Figure 6}. 169--186. The 158--159 exchange fills a crucial
liberty for W.}

\centerline{\hglue-20pt\epsffile{figure7.1.eps}}
\medbreak
\centerline{{\bf Figure 7}. 187--202. Ignoring 187, B fights and wins a ko.}
\bigbreak

\centerline{\hglue-20pt\epsffile{figure8.1.eps}}
\medbreak
\centerline{{\bf Figure 8}. 203--218. 207 connects. W resigns.}

\centerline{\hglue-20pt\epsffile{figure9.1.eps}}
\medbreak
\centerline{{\bf Figure 9}. From another game. After 1, GNU Go will
capture one of the four marked strings.}
\bigbreak

{\hfil\epsffile{figure10.1.eps}\hfil\epsffile{figure10a.1.eps}}
\medbreak
\centerline{{\bf Figure 10}. A 13x13 game. GNU Go 3.3.12 is white. 
Black passes at moves 3 and 5.}

\vfil\eject

\vglue1in
\centerline{\titlefont No Warranty}
\medbreak

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