Minor cleanup

Advanced/Retrograde Analysis/main.tex

@@ -136,71 +136,11 @@ $\odot$}}
 	}
 
 
-	\section{Rules}
+	\input{parts/00 rules}
-
+	\input{parts/01 intro}
-	This handout contains a set of problems. \par
+	\input{parts/02 easy}
-	Each is marked with a few gold stars, which you collect by presenting a solution.
+	\input{parts/03 medium}
-
+	%\input{parts/04 hard}
-	\vspace{2mm}
-
-	Below each problem is a list of hints, written next to their cost. \par
-	To get a hint, you must pay the marked number of stars. \par
-	Hints are usually provided in order, and are the same for all groups. \par
-
-	\vspace{2mm}
-
-	There is one exception: instructors may offer certain hints for a reduced fee,
-	judging by your explanation of what you have so far.
-
-	\begin{instructornote}
-		This exception is for groups that are stuck on the last bit of a problem. \par
-		If they've solved most of it, give them the information they already know
-		for a steep discount (or even for free).
-	\end{instructornote}
-
-
-
-	An example problem is below.
-
-	\vspace{4mm}
-
-	\generic{Problem $0$:}
-	\starvalue{4}
-
-	This is a problem that's worth four points. \par
-	Two hints are available. The first costs two stars (of the four available). \par
-	The second costs one of the two stars available \textit{after} revealing the first hint.
-
-	\begin{hintlist}
-		Hint 1:
-		\hintcontent{2}{4}{This is a hint. Only instructors see this.}
-
-		Hint 2:
-		\hintcontent{1}{2}{This is another hint.}
-	\end{hintlist}
-
-	\vfill
-
-	You may notice that hints often cost a significant fraction of their problem's score. \par
-	This is intentional---don't ask for hints unless you're very, very stuck.
-
-
-
-
-	\vfill
-	\pagebreak
-
-	\input{parts/intro}
-
-
-	\section{Simple problems}
-	\input{parts/easy}
-
-	\section{Slightly harder problems}
-	\input{parts/medium}
-
-	%\section{Very difficult problems}
-	%\input{parts/hard}
 
 	\chessboard \hfill \chessboard \par
 	\chessboard \hfill \chessboard \par

Advanced/Retrograde Analysis/parts/00 rules.tex

@@ -0,0 +1,53 @@
+\section{Rules}
+
+This handout contains a set of problems. \par
+Each is marked with a few gold stars, which you collect by presenting a solution.
+
+\vspace{2mm}
+
+Below each problem is a list of hints, written next to their cost. \par
+To get a hint, you must pay the marked number of stars. \par
+Hints are usually provided in order, and are the same for all groups. \par
+
+\vspace{2mm}
+
+There is one exception: instructors may offer certain hints for a reduced fee,
+judging by your explanation of what you have so far.
+
+\begin{instructornote}
+    This exception is for groups that are stuck on the last bit of a problem. \par
+    If they've solved most of it, give them the information they already know
+    for a steep discount (or even for free).
+\end{instructornote}
+
+
+
+An example problem is below.
+
+\vspace{4mm}
+
+\generic{Problem $0$:}
+\starvalue{4}
+
+This is a problem that's worth four points. \par
+Two hints are available. The first costs two stars (of the four available). \par
+The second costs one of the two stars available \textit{after} revealing the first hint.
+
+\begin{hintlist}
+    Hint 1:
+    \hintcontent{2}{4}{This is a hint. Only instructors see this.}
+
+    Hint 2:
+    \hintcontent{1}{2}{This is another hint.}
+\end{hintlist}
+
+\vfill
+
+You may notice that hints often cost a significant fraction of their problem's score. \par
+This is intentional---don't ask for hints unless you're very, very stuck.
+
+
+
+
+\vfill
+\pagebreak

Advanced/Retrograde Analysis/parts/02 easy.tex

@@ -1,3 +1,7 @@
+\section{Simple problems}
+
+
+
 % Sherlock, A little exercise
 \problem{A little exercise}
 %\difficulty{1}{5}

Advanced/Retrograde Analysis/parts/03 medium.tex

@@ -1,3 +1,4 @@
+\section{Slightly harder problems}
 
 % Sherlock, A matter of direction
 \problem{A matter of direction}
@@ -38,6 +39,16 @@ Did White start on the north or south side of the board? \par
 
 
 
+
+
+
+
+
+
+
+
+
+
 % Arabian Knights 1
 \problem{Where is the king?}
 %\difficulty{3}{5}
@@ -195,7 +206,8 @@ White to move. Which side of the board did each color start on? \par
 
 % Arabian Knights 4
 \problem{A missing piece}
-\difficulty{4}{5}
+%\difficulty{4}{5}
+\startimes{20}
 
 There is a piece at G4, marked with a $\odot$. \par
 What is it, and what is its color? \par
@@ -207,35 +219,72 @@ What is it, and what is its color? \par
 	pa5,
 	Ug4,
 	Pb3,Pg3,Ph3,
-	ba2,Pb2,Pc2,Pd2,Pf2,qg2,rh2,
+	ba2,Pb2,Pc2,Pd2,Pf2,qg2,bh2,
 	Kc1,Rd1,nf1,Bh1
 }
 
 \begin{hintlist}
 	Hint 1:
-	\hintcontent{4}{10}{
+	\hintcontent{1}{20}{
-		Double-checks make all positions seem impossible... \par
+		What color is the missing piece? Count captures.\par
-		Try E1 and F2 anyway. Can you add pieces to make it make sense? \par
+		Look at the region bounded by A1 and B3. How did the bishop get there? \par
-		Don't forget about promotion.
+		\note[Note]{This is Part 1}
+		\vspace{2mm}
 	}
+
+	
+	Hint 2:
+	\hintcontent{1}{19}{
+		What was White's last move? \par
+		What does this tell us about White's king? \par
+		\note[Note]{This is Part 2}
+		\vspace{2mm}
+	}
+	
+	Hint 3:
+	\hintcontent{1}{18}{
+		Now, look at the region bounded by G1 and H3. \par
+		In Part 1, we found that all of White's pieces were captured---including the H1 rook. \par
+		How did it get off its home square to be captured? \par
+		What does this tell us about the bishop on H1? \par
+		\note[Note]{This is Part 3}
+		\vspace{2mm}
+	}
+	
+	Hint 4:
+	\hintcontent{1}{17}{
+		The black bishop on H2 must have been promoted on G1. \par
+		Which pawn was it, and how did it get there? (Remember, we counted captures in Part 1). \par
+		In what order did the cross capture by the G1 and H1 pawns occur? \par
+		\note[Note]{This is Part 4}
+		\vspace{2mm}
+	}
+
+	Hint 5:
+	\hintcontent{5}{16}{
+		Which black pieces are still missing? \par
+		Remember that White cannot castle through check.
+	}
+
+
 \end{hintlist}
 
 
-\begin{instructornote}
+%\begin{instructornote}
-	\textbf{Hints to give:} (in this order)
+%	\textbf{Hints to give:} (in this order)
-	\begin{itemize}
+%	\begin{itemize}
-		\item How did the black bishop on A2 get there? \note{(Part 1)}
+%		\item How did the black bishop on A2 get there? \note{(Part 1)}
-		\item How many captures has Black made? \note{(Part 1)}
+%		\item How many captures has Black made? \note{(Part 1)}
-		\item What color is the missing piece? \note{(Part 1)}
+%		\item What color is the missing piece? \note{(Part 1)}
-		\item What was White's last move? What does this imply? \note{(Part 2)}
+%		\item What was White's last move? What does this imply? \note{(Part 2)}
-		\item Which white pieces were captured? \par
+%		\item Which white pieces were captured? \par
-			How did they move from their starting positions? \note{(Part 3)}
+%			How did they move from their starting positions? \note{(Part 3)}
-		\item How did the bishop on H2 get to where it is now? \note{(Part 3)}
+%		\item How did the bishop on H2 get to where it is now? \note{(Part 3)}
-		\item Which pawn was promoted to the bishop now on H2? \note{(Part 4)}
+%		\item Which pawn was promoted to the bishop now on H2? \note{(Part 4)}
-		\item Which black pieces are still missing? \note{(Conclusion)}
+%		\item Which black pieces are still missing? \note{(Conclusion)}
-		\item Remember that White cannot castle through check. \note{(Conclusion)}
+%		\item Remember that White cannot castle through check. \note{(Conclusion)}
-	\end{itemize}
+%	\end{itemize}
-\end{instructornote}
+%\end{instructornote}
 
 \vfill
 \pagebreak

Advanced/Retrograde Analysis/parts/04 hard.tex

@@ -1,3 +1,5 @@
+\section{Very difficult problems}
+
 % Arabian Knights 5
 \problem{The hidden castle}
 \difficulty{7}{7}