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+%%%%%%%%%%%%%%%%%%%%%%%% othello.sty %%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+
+%
+% Othello package written by Michiel le Comte  michiel.le.comte@zonnet.nl
+% This package has been created using (mutilating?) the Go package written by
+% Hanna Kolodziejska (version 0.05 : November 1991) as basis
+
+
+% Remark: if someone can fix a switch in the pos thingie, please notify me.
+% A nicer metafont definition for the letter X and C (ot1neu.mf, digit[10] and
+% digit[11]) is also welcome.
+%
+% For a short introduction how to use this package, look at the othello.tex file,
+% it contains a short manual at the end.
+%
+
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+\catcode`@=11
+
+\newbox\@gobox \newdimen\@godimen
+
+
+\def\gofontsize#1{
+    \font\gofont=ot#1 at #1truept
+    \font\blackfontOne=ot1bla#1 at #1truept
+    \font\whitefontOne=ot1whi#1 at #1truept
+    \font\neutralfontOne=ot1neu#1 at #1truept
+    \ifnum #1=10 \font\letterfont=cmr10 at 10truept\else
+        \ifnum #1=15 \font\letterfont=cmr10 at 14.4truept\else
+        \ifnum #1=20 \font\letterfont=cmr10 at 17.28truept\fi\fi\fi
+    \setbox\@gobox=\hbox{\gofont\char0}
+    \@godimen=\wd\@gobox
+    }
+
+\gofontsize{10} % initialization <---
+
+\def\newgoline{\hfill\break}
+\def\empty{\gofont\char1}
+\def\lftborder{\gofont\char2}
+\def\rtborder{\gofont\char3}
+\def\topborder{\gofont\char4}
+\def\botborder{\gofont\char5}
+\def\lfttopcorner{\gofont\char6}
+\def\rttopcorner{\gofont\char7}
+\def\lftbotcorner{\gofont\char8}
+\def\rtbotcorner{\gofont\char9}
+
+\newcount\n
+\newcount\@beglet \newcount\@endlet
+\newcount\@lettercount
+
+\def\@letternumber#1{\relax
+    \ifx #1a\@lettercount=1\else
+    \ifx #1b\@lettercount=2\else
+    \ifx #1c\@lettercount=3\else
+    \ifx #1d\@lettercount=4\else
+    \ifx #1e\@lettercount=5\else
+    \ifx #1f\@lettercount=6\else
+    \ifx #1g\@lettercount=7\else
+    \ifx #1h\@lettercount=8\else
+    \ifx #1i\@lettercount=9\else
+       \errmessage{Row label must be letter!}
+    \fi\fi\fi\fi\fi\fi\fi\fi\fi
+   }
+
+\def\inidiagram#1-#2:#3-#4 {\relax
+    \ifnum #3>#4 \errmessage{Invalid column numbers!} \fi
+    \@letternumber{#1} \@beglet=\@lettercount
+    \@letternumber{#2} \@endlet=\@lettercount
+    \def\@inirow##1##2{{\n=#3
+      \loop
+       \expandafter\let\csname @##1\romannumeral\n \endcsname=0\relax
+       \edef\@@inirow{\global
+            \def\csname @##1\romannumeral\n \endcsname{##2}}\@@inirow
+       \ifnum \n<#4 \advance \n by 1
+      \repeat
+      }}\relax
+    \loop
+      \ifcase\@beglet\relax\or
+      \@inirow{a}{\topborder}\relax
+        \ifnum #3=1 \global\def\@ai{\lfttopcorner}\fi
+        \ifnum #4=9 \global\def\@aix{\rttopcorner}\fi \or
+      \@inirow{b}{\empty}\relax
+        \ifnum #3=1 \global\def\@bi{\lftborder}\fi
+        \ifnum #4=9 \global\def\@bix{\rtborder}\fi \or
+      \@inirow{c}{\empty}\relax
+        \ifnum #3=1 \global\def\@ci{\lftborder}\fi
+        \ifnum #4=9 \global\def\@cix{\rtborder}\fi \or
+      \@inirow{d}{\empty}\relax
+        \ifnum #3=1 \global\def\@di{\lftborder}\fi
+        \ifnum #4=9 \global\def\@dix{\rtborder}\fi \or
+      \@inirow{e}{\empty}
+        \ifnum #3=1 \global\def\@ei{\lftborder}\fi
+        \ifnum #4=9 \global\def\@eix{\rtborder}\fi \or
+      \@inirow{f}{\empty}
+        \ifnum #3=1 \global\def\@fi{\lftborder}\fi
+        \ifnum #4=9 \global\def\@fix{\rtborder}\fi \or
+      \@inirow{g}{\empty}
+        \ifnum #3=1 \global\def\@gi{\lftborder}\fi
+        \ifnum #4=9 \global\def\@gix{\rtborder}\fi \or
+      \@inirow{h}{\empty}
+        \ifnum #3=1 \global\def\@hi{\lftborder}\fi
+        \ifnum #4=9 \global\def\@hix{\rtborder}\fi \or
+      \@inirow{i}{\botborder}
+        \ifnum #3=1 \global\def\@ii{\lftbotcorner}\fi
+        \ifnum #4=9 \global\def\@iix{\rtbotcorner}\fi
+      \fi
+      \ifnum \@beglet<\@endlet \advance \@beglet by 1
+    \repeat
+    }
+
+\def\inifulldiagram{\inidiagram a-i:1-9 }
+
+\inifulldiagram % initialization
+
+
+\def\showdiagram#1-#2:#3-#4 {\vbox{\offinterlineskip\noindent
+    \ifnum #3>#4 \errmessage{Invalid column numbers!} \fi
+    \hsize=\@godimen
+    \n=#4\advance\n by-#3\advance\n by1
+    \multiply\hsize by\n
+    \@letternumber{#1} \@beglet=\@lettercount
+    \@letternumber{#2} \@endlet=\@lettercount
+    \def\@showrow##1{{\n=#3
+      \loop
+        \edef\@@showrow{\csname @##1\romannumeral\n \endcsname}\@@showrow
+        \ifnum \n<#4 \advance \n by 1
+      \repeat
+      }}\relax
+    \loop
+      \ifcase\@beglet\relax\or
+        \@showrow{a}\or
+        \@showrow{b}\or
+        \@showrow{c}\or
+        \@showrow{d}\or
+        \@showrow{e}\or
+        \@showrow{f}\or
+        \@showrow{g}\or
+        \@showrow{h}\or
+        \@showrow{i}
+      \fi
+      \ifnum \@beglet<\@endlet
+        \newgoline \advance \@beglet by 1
+    \repeat
+    }}
+
+\def\showfulldiagram{\showdiagram a-i:1-9 }
+
+\def\pos#1#2=#3#4{\relax
+    \ifcat #1a\relax \else \errmessage{Row label must be a letter!}\fi
+    \ifnum #2<1 \errmessage{Column number less than 1?}\fi
+    \ifnum #2>9 \errmessage{Column number greater than 9?}\fi
+    \edef\@fourth{#4}\relax
+    \ifx .#4\ifx #3\empty\edef\@fourth{}\else \edef\@fourth{0}\fi\fi
+    \edef\@borders{\relax
+        \ifx #1a \ifnum #2=1  \gofont\char6 \else
+                 \ifnum #2=9 \gofont\char7 \else
+                 \gofont\topborder
+        \fi\fi
+        \else
+        \ifx #1i \ifnum #2=1 \gofont\char17 \else
+                 \ifnum #2=9 \gofont\char18 \else
+                \gofont\char14 \fi\fi
+        \else
+        \ifnum #2=1 \lftborder
+        \else
+        \ifnum #2=9 \gofont\char12
+        \else
+        \gofont\char1
+        \fi\fi\fi\fi
+        }\relax
+    \expandafter\let\csname @#1\romannumeral#2\endcsname=0\relax
+    \edef\@pos{\def\csname @#1\romannumeral#2\endcsname{#3{\@fourth}}}\@pos
+    \ignorespaces
+    }
+
+\newcount\nr
+
+\def\black#1{\relax
+    \ifx \triangle#1{\rlap{\triangle}\@borders}\else
+    \ifx \square#1{\rlap{\square}\@borders}\else
+    \ifnum #1<0 \errmessage{Negative White's move?}\else
+    \ifnum #1>64 \errmessage{White's move too big!}\else
+    \ifnum #1<65 {\blackfontOne\rlap{\char#1}\@borders}\fi\fi\fi\fi\fi}
+
+\def\white#1{\relax
+    \ifx \triangle#1{\rlap{\triangle}\@borders}\else
+    \ifx \square#1{\rlap{\square}\@borders}\else
+    \ifnum #1<0 \errmessage{Negative White's move?}\else
+    \ifnum #1>64 \errmessage{White's move too big!}\else
+    \ifnum #1<65 {\whitefontOne\rlap{\char#1}\@borders}\fi\fi\fi\fi\fi}
+
+\def\neutral#1{\relax
+    \ifx \triangle#1{\rlap{\triangle}\@borders}\else
+    \ifx \square#1{\rlap{\square}\@borders}\else
+    \ifnum #1<0 \errmessage{A negative move?}\else
+    \ifnum #1>66 \errmessage{There are only 64 moves to make!}\else
+    \ifnum #1<67 {\neutralfontOne\rlap{\char#1}\@borders}\fi\fi\fi\fi\fi}
+
+\def\textblack#1{\def\@borders{\hskip\wd\@gobox}\relax
+    \ifx .#1\lower.2\wd\@gobox\hbox{\black{0}}\else
+      \lower.2\wd\@gobox\hbox{\black{#1}}\fi}
+
+\def\textwhite#1{\def\@borders{\hskip\wd\@gobox}\relax
+    \ifx .#1\lower.2\wd\@gobox\hbox{\white{0}}\else
+      \lower.2\wd\@gobox\hbox{\white{#1}}\fi}
+
+\newbox\@letterbox \newdimen\@letterdim
+
+\catcode`@=12
+