diff --git a/2000/robison/Makefile b/2000/robison/Makefile
index b5c5f627c..17d460fa0 100644
--- a/2000/robison/Makefile
+++ b/2000/robison/Makefile
@@ -63,7 +63,7 @@ CDEFINE=
 
 # Include files that are needed to compile
 #
-CINCLUDE=
+CINCLUDE= -include stdio.h
 
 # Optimization
 #
diff --git a/2000/robison/README.md b/2000/robison/README.md
index eacacaa25..49e4b5747 100644
--- a/2000/robison/README.md
+++ b/2000/robison/README.md
@@ -12,13 +12,6 @@ make
 ```
 
 
-### Try:
-
-```sh
-echo "Do or do not. There is no try."
-```
-
-
 ## Judges' remarks:
 
 The program plays almost always reasonably, but does not always detect
@@ -33,27 +26,32 @@ author a patent he applied for.  :-)
 
 ## Author's remarks:
 
+
 ### TITLE OF INVENTION
 
 Highly Compressed Program for Playing Hygienic Checkers
 
+
 ### FIELD OF INVENTION
 
 The present invention generally relates to
 [checkers](https://en.wikipedia.org/wiki/Checkers).
 
+
 ### BACKGROUND OF THE INVENTION
 
-Within the field of [checkers](https://en.wikipedia.org/wiki/Checkers), the
+Within the field of [Checkers](https://en.wikipedia.org/wiki/Checkers), the
 problem of finding a hygienic opponent is difficult, as good opponents are
 peculiar to the tavern habitat of cracker-barrels, pot-belly stoves, tobacco,
 and spittoons.
 
+
 ### BRIEF SUMMARY OF THE INVENTION
 
-The present invention plays [checkers](https://en.wikipedia.org/wiki/Checkers)
+The present invention plays [Checkers](https://en.wikipedia.org/wiki/Checkers)
 without spitting.
 
+
 ### BRIEF DESCRIPTION OF SEVERAL VIEWS OF THE INVENTION
 
 FIG. 1 shows a numbering of positions.
@@ -64,6 +62,7 @@ FIG. 3 shows a sample board.
 
 FIG. 4 shows a method in accordance with the present invention.
 
+
 ### DETAILED DESCRIPTION OF THE INVENTION
 
 Operator plays Black (`x`); the program plays White (`o`).  Said Black goes first.
@@ -85,7 +84,7 @@ said loser.
 
 FIG. 4 shows a C program in accordance with the present invention.  Control flow
 is straightforward: control enters routine `main()`, executes a plurality of
-statements, and exits via `return` statement.  FIG. 4 presumes that type `int`
+statements, and exits via a `return` statement.  FIG. 4 presumes that type `int`
 is `32 bits` and `short` is `16 bits`, which are essential to the preferred
 embodiment of the invention.  FIG. 4 also presumes that the host computer uses
 ASCII encoding for characters. It should be obvious that practitioners skilled
@@ -95,6 +94,7 @@ The disclosure here describes a particular embodiment of the present invention,
 and other embodiments within the spirit of this disclosure are possible, as well
 as consumption of spirits while playing.
 
+
 ### CLAIMS
 
 I claim, by letters patently absurd:
@@ -110,10 +110,10 @@ I claim, by letters patently absurd:
     and beta cuts.
 
 3.  The method of claim 1, further comprising the step of formatting the
-    source code with short lines, in order to impress manager with
+    source code with short lines, in order to impress the manager with
     high productivity, when measured in lines of code.
 
-4.  The method of claim 3, further comprising the step for telling
+4.  The method of claim 3, further comprising the step for telling the
     skeptical manager that this is the well-known technique of
     "linear programming".
 
@@ -129,6 +129,7 @@ I claim, by letters patently absurd:
     sequence to either sum a plurality of bits in an N-bit word or reverses
     them, in lg(N) time, depending upon a parameter.
 
+
 ### DRAWINGS
 
 #### FIG 1.
diff --git a/2000/robison/robison.c b/2000/robison/robison.c
index 0cd09773d..454d655e3 100644
--- a/2000/robison/robison.c
+++ b/2000/robison/robison.c
@@ -689,22 +689,44 @@ C
 o&
 4)
 {
-o&
-1?
+char
+X1[
+5]=
+{'\
+\0'}
+,X2
+[5]
+={\
+'\0\
+'};
+C o
+&1
+){
 scanf
-("%d"
-,&
-n)
-:(
+("%4s"
+,X1);
+n=at\
+oi(X1);
+}else
+{X1[
+0]=
+'\
+\0'
+;X2
+[0]
+='\0';
 scanf
-("%d%d"
-,&
-m,
-&n
-),
---
-m)
-;
+("%4s\
+%4s",
+X1,
+X2);
+m=
+atoi
+(X1);
+n=
+atoi
+(X2)
+;--m;
 Z=
 A
 N>>
@@ -729,7 +751,7 @@ B,
 H"{	 ; { {	} { }	{ ;	}  ; {  		 "
 ))
 ;
-}
+}}
 }
 else
 {
diff --git a/2019/karns/Makefile b/2019/karns/Makefile
index 6cb1f6e3f..5677b3f1d 100644
--- a/2019/karns/Makefile
+++ b/2019/karns/Makefile
@@ -114,7 +114,7 @@ PROG= prog
 #
 OBJ= ${PROG}.o
 CSRC= ${PROG}.o
-DATA= maze demo.sh
+DATA= maze try.sh
 TARGET= ${PROG}
 #
 ALT_OBJ=
@@ -141,8 +141,8 @@ ${PROG}: ${PROG}.c
 	${CC} ${CFLAGS} $< -o $@ ${LDFLAGS}
 	${LN} -sf ${PROG} tbfs
 
-test: prog
-	${CAT} prog.c | ./prog
+test: ${PROG}
+	./${PROG} < ${PROG}.c
 
 
 # alternative executable
diff --git a/2019/karns/README.md b/2019/karns/README.md
index df51ddeb5..257946013 100644
--- a/2019/karns/README.md
+++ b/2019/karns/README.md
@@ -26,7 +26,7 @@ The last two can be done in a sequence, first showing the respective files at
 the terminal, like:
 
 ```sh
-./demo.sh
+./try.sh
 ```
 
 
diff --git a/2019/karns/demo.sh b/2019/karns/try.sh
similarity index 62%
rename from 2019/karns/demo.sh
rename to 2019/karns/try.sh
index e70d0f521..e8e02483d 100755
--- a/2019/karns/demo.sh
+++ b/2019/karns/try.sh
@@ -5,8 +5,17 @@
 # Doesn't run the program on README.md as it's longer and slower.
 #
 
-# make prog first and exit if failure
-make || exit
+# make sure CC is set so that when we do make CC="$CC" it isn't empty. Doing it
+# this way allows us to have the user specify a different compiler in an easy
+# way.
+if [[ -z "$CC" ]]; then
+    CC="cc"
+fi
+
+make CC="$CC" all >/dev/null || exit 1
+
+# clear screen after compilation so that only the entry is shown
+clear
 
 # display prog.c to the user
 echo "$ cat prog.c"
diff --git a/thanks-for-fixes.md b/thanks-for-fixes.md
index ba8a1fb13..6335b1a42 100644
--- a/thanks-for-fixes.md
+++ b/thanks-for-fixes.md
@@ -2304,6 +2304,20 @@ Cody also added the [try.sh](2000/primenum/try.sh) script.
 Cody added the [try.sh](2000/rince/try.sh) script.
 
 
+## [2000/robison](2000/robison/robison.c) ([README.md](2000/robison/README.md]))
+
+Cody fixed an infinite loop that occurred if invalid input was entered, flooding
+the screen with:
+
+```
+Black position and direction: illegal
+```
+
+This was fixed by having the `scanf(3)` read in a string and then use `atoi(3)`
+on it to assign to the `int`s, much like with `1987/lievaart`. The strings are
+`char[5]` and the `%` specifier is `%4s` which is enough for the game.
+
+
 ## [2000/thadgavin](2000/thadgavin/thadgavin.c) ([README.md](2000/thadgavin/README.md]))
 
 Cody fixed the code and added an appropriate make rule so that the SDL version