diff --git a/2020/kurdyukov3/.gitignore b/2020/kurdyukov3/.gitignore
index ea1749132..44815ac94 100644
--- a/2020/kurdyukov3/.gitignore
+++ b/2020/kurdyukov3/.gitignore
@@ -1 +1,3 @@
 prog
+prog.alt
+prog.extra
diff --git a/2020/kurdyukov3/Makefile b/2020/kurdyukov3/Makefile
index b6684c684..7b54439f4 100644
--- a/2020/kurdyukov3/Makefile
+++ b/2020/kurdyukov3/Makefile
@@ -62,8 +62,8 @@ X11_INCDIR= /opt/X11/include
 
 # Common C compiler warnings to silence
 #
-#CSILENCE=
-CSILENCE= -Wno-shorten-64-to-32 -Wno-sign-conversion -Wno-unknown-warning-option
+CSILENCE=
+#CSILENCE= -Wno-implicit-int
 
 # Common C compiler warning flags
 #
@@ -102,7 +102,7 @@ CINCLUDE=
 #CINCLUDE= -include stdio.h
 #CINCLUDE= -include stdlib.h -include stdio.h
 #CINCLUDE= -I ${X11_INCDIR}
-#CINCLUDE= -I ${HOMEBREW_PREFIX}/include/SDL2
+#CINCLUDE= `${SDL2_CONFIG} --cflags`
 
 # Optimization
 #
@@ -126,7 +126,7 @@ CFLAGS= ${CSTD} ${CWARN} ${ARCH} ${CDEFINE} ${CINCLUDE} ${OPT}
 LIBS=
 #LIBS= -lm
 #LIBS= -L ${X11_LIBDIR} -lX11
-#LIBS= -L ${HOMEBREW_PREFIX}/lib -lSDL
+#LIBS= `${SDL2_CONFIG} --libs`
 
 # C compiler to use
 #
@@ -138,7 +138,8 @@ CC= cc
 #
 ifeq ($(CC),clang)
 #
-CSILENCE+= -Wno-comma -Wno-conditional-uninitialized -Wno-poison-system-directories
+CSILENCE+= -Wno-comma -Wno-conditional-uninitialized -Wno-poison-system-directories \
+	-Wno-shorten-64-to-32 -Wno-sign-conversion
 #
 CWARN+= -Weverything
 #
@@ -163,11 +164,11 @@ ENTRY= kurdyukov3
 PROG= prog
 #
 OBJ= ${PROG}.o
-DATA=
+DATA= input.txt
 TARGET= ${PROG}
 #
-ALT_OBJ= ${PROG}.alt.o
-ALT_TARGET= ${PROG}.alt
+ALT_OBJ= ${PROG}.alt.o ${PROG}.extra.o
+ALT_TARGET= ${PROG}.alt ${PROG}.extra
 
 
 #################
@@ -184,14 +185,17 @@ all: data ${TARGET}
 ${PROG}: ${PROG}.c
 	${CC} ${CFLAGS} $< -o $@ ${LIBS}
 
-${PROG}.alt: ${PROG}.alt.c
-	${CC} ${CFLAGS} $< -o $@ ${LIBS}
-
 # alternative executable
 #
 alt: data ${ALT_TARGET}
 	@${TRUE}
 
+${PROG}.alt: ${PROG}.alt.c
+	${CC} ${CFLAGS} $< -o $@ ${LIBS}
+
+${PROG}.extra: ${PROG}.extra.c
+	${CC} ${CFLAGS} $< -o $@ ${LIBS}
+
 # data files
 #
 data: ${DATA}
@@ -326,3 +330,4 @@ pluto: charon
 	@echo "dwarf is a type of planet"
 	@echo "therefore, $@ is a planet"
 	@echo "having lots of planets is good feature because supernovae can help ${MAKE} a lot of them"
+
diff --git a/2020/kurdyukov3/README.md b/2020/kurdyukov3/README.md
index 449b6794b..d32a5857d 100644
--- a/2020/kurdyukov3/README.md
+++ b/2020/kurdyukov3/README.md
@@ -1,32 +1,35 @@
 # Bset slaml prragom
 
+```
 Ilya Kurdyukov  
 <https://github.com/ilyakurdyukov>  
 Twitter: @ilyakurdyukov  
-
-
-The code for this entry can be found in prog.c
-
-## Judges' comments:
+```
 
 ## To build:
 
-    make all
+```sh
+make
+```
 
-### To use:
+### To run:
 
-    ./prog
+```sh
+./prog
+```
 
 ### Try:
 
-    # first input to try
-    echo first input to try | ./prog
+```sh
+# first input to try
+echo first input to try | ./prog
 
-    # try reading this output
-    echo International Obfuscated C Code Contest | ./prog
+# try reading this output
+echo International Obfuscated C Code Contest | ./prog
 
-    # try reading this other output
-    ./prog < input.txt
+# try reading this other output
+./prog < input.txt
+```
 
 ### Alternate code
 
@@ -34,7 +37,9 @@ There is an alternate version of this code in `prog.alt.c` where the main code i
 
 To compile this alternate version:
 
-    make alt
+```sh
+make alt
+```
 
 Use `prog.alt` as you would `prog` above.
 
@@ -50,14 +55,16 @@ is it a pnuch crad)?
 
 Compile and try this:
 
+```sh
 cat input.txt | ./prog
+```
 
 The program can work with letters that are not represented in English, as long as these letters are encoded in the higher part of the single-byte character set (use `iconv` to convert from UTF-8 and back).
 
------------------------------------------------------------------------------------------------------
+## Copyright:
+
 (c) Copyright 1984-2020, [Leo Broukhis, Simon Cooper, Landon Curt Noll][judges] - All rights reserved
 This work is licensed under a [Creative Commons Attribution-ShareAlike 3.0 Unported License][cc].
 
 [judges]: http://www.ioccc.org/judges.html
 [cc]: http://creativecommons.org/licenses/by-sa/3.0/
------------------------------------------------------------------------------------------------------