diff --git a/captcha/captcha.sh b/captcha/captcha.sh
index 3efe84c..1c1db55 100755
--- a/captcha/captcha.sh
+++ b/captcha/captcha.sh
@@ -99,7 +99,7 @@ SOMME()
         A=$(($INPUT - $RA))
         B=$RA
     else
-        B=$(($INPUT + $RA))
+        B=$(($INPUT - $RA))
         A=$RA
     fi
     
@@ -127,16 +127,16 @@ RAND_INDEX=$(($R % ${#TRANSFORMATIONS[@]}))
 convert -size 300x60 xc:none -pointsize 20 \
 	\( -clone 0 -fill black \
 	-stroke black -strokewidth 1 \
-	-annotate "${RAND_ANGLE}x${RAND_ITALIC}+0+0" "\n $(${TRANSFORMATIONS[1]})" \
+	-annotate "${RAND_ANGLE}x${RAND_ITALIC}+0+0" "\n $(${TRANSFORMATIONS[$RAND_INDEX]})" \
 	-roll +$ROLL_X+0 \
 	-wave "$WAVE1_AMPLITUDE"x"$WAVE1_LENGTH" \
 	-roll -$ROLL_X+0 \) \
-	-flatten -crop 300x60 +repage -quality 500 -depth 11 png:"/var/tmp/captcha/$(date "+%Y-%m-%d-%H%M").png"
+	-flatten -crop 300x60 +repage -quality 500 -depth 11 png:"/var/tmp/captcha/${INPUT}_$(date "+%Y-%m-%d-%H%M%S").png"
 
 convert -size 300x60 xc:none -pointsize 20 \
 	\( -clone 0 -fill black \
 	-stroke black -strokewidth 1 \
-	-annotate "${RAND_ANGLE}x${RAND_ITALIC}+0+0" "\n $(${TRANSFORMATIONS[1]})" \
+	-annotate "${RAND_ANGLE}x${RAND_ITALIC}+0+0" "\n $(${TRANSFORMATIONS[$RAND_INDEX]})" \
 	-roll +$ROLL_X+0 \
 	-wave "$WAVE1_AMPLITUDE"x"$WAVE1_LENGTH" \
 	-roll -$ROLL_X+0 \) \
diff --git a/captcha/experimental.sh b/captcha/experimental.sh
index 3efe84c..fb3e4d6 100755
--- a/captcha/experimental.sh
+++ b/captcha/experimental.sh
@@ -99,7 +99,7 @@ SOMME()
         A=$(($INPUT - $RA))
         B=$RA
     else
-        B=$(($INPUT + $RA))
+        B=$(($INPUT - $RA))
         A=$RA
     fi
     
@@ -127,16 +127,16 @@ RAND_INDEX=$(($R % ${#TRANSFORMATIONS[@]}))
 convert -size 300x60 xc:none -pointsize 20 \
 	\( -clone 0 -fill black \
 	-stroke black -strokewidth 1 \
-	-annotate "${RAND_ANGLE}x${RAND_ITALIC}+0+0" "\n $(${TRANSFORMATIONS[1]})" \
+	-annotate "${RAND_ANGLE}x${RAND_ITALIC}+0+0" "\n $(${TRANSFORMATIONS[$RAND_INDEX]})" \
 	-roll +$ROLL_X+0 \
 	-wave "$WAVE1_AMPLITUDE"x"$WAVE1_LENGTH" \
 	-roll -$ROLL_X+0 \) \
-	-flatten -crop 300x60 +repage -quality 500 -depth 11 png:"/var/tmp/captcha/$(date "+%Y-%m-%d-%H%M").png"
+	-flatten -crop 300x60 +repage -quality 500 -depth 11 png:"/var/tmp/captcha/EXPERIMENTAL${INPUT}_$(date "+%Y-%m-%d-%H%M%S").png"
 
 convert -size 300x60 xc:none -pointsize 20 \
 	\( -clone 0 -fill black \
 	-stroke black -strokewidth 1 \
-	-annotate "${RAND_ANGLE}x${RAND_ITALIC}+0+0" "\n $(${TRANSFORMATIONS[1]})" \
+	-annotate "${RAND_ANGLE}x${RAND_ITALIC}+0+0" "\n $(${TRANSFORMATIONS[$RAND_INDEX]})" \
 	-roll +$ROLL_X+0 \
 	-wave "$WAVE1_AMPLITUDE"x"$WAVE1_LENGTH" \
 	-roll -$ROLL_X+0 \) \