diff --git a/Source/CMakeLists.txt b/Source/CMakeLists.txt
index 6cacb59..8e1718c 100644
--- a/Source/CMakeLists.txt
+++ b/Source/CMakeLists.txt
@@ -14,7 +14,7 @@ set(SOURCE_FILES
         functions/AbstractionLayers/Layer_SURFFeatures/AbstractionLayer_SURFFeatures.cpp
         functions/AbstractionLayers/Layer_ColorMatching/AbstractionLayer_ColorMatching.cpp
         functions/AbstractionLayers/DestructionPower/DestructionPower.cpp
-        functions/AbstractionLayers/Layer_Histogram/AbstractionLayer_Histogram.cpp
+        functions/AbstractionLayers/Layer2_KantenLaenge/AbstractionLayer_KantenLaenge.cpp
         header/solve.h
         header/input.h
         functions/solve/puzzleExtension.cpp)
diff --git a/Source/functions/AbstractionLayers/DestructionPower/DestructionPower.h b/Source/functions/AbstractionLayers/DestructionPower/DestructionPower.h
index 8d8eb9f..288af80 100644
--- a/Source/functions/AbstractionLayers/DestructionPower/DestructionPower.h
+++ b/Source/functions/AbstractionLayers/DestructionPower/DestructionPower.h
@@ -1,6 +1,6 @@
 #pragma once
 //TODO!! increase Destructioncount
-#define DESTRUCTION_COUNT 1
+#define DESTRUCTION_COUNT 3
 
 #include "DestructionPower_Properties.h"
 #include "../AbstraktionLayer_Base.h"
diff --git a/Source/functions/AbstractionLayers/Layer1/AbstractionLayer_1.cpp b/Source/functions/AbstractionLayers/Layer1/AbstractionLayer_1.cpp
index b5e335b..339f784 100644
--- a/Source/functions/AbstractionLayers/Layer1/AbstractionLayer_1.cpp
+++ b/Source/functions/AbstractionLayers/Layer1/AbstractionLayer_1.cpp
@@ -27,8 +27,10 @@ bool AbstractionLayer_1::PreProcessing(coor mySize,  const vector<Part*>* partAr
             {
                 ref_partArray[iterator]->m_a1.m_connections=poempel;
                 ref_partArray[iterator]->m_a3.SideLength=analyse.getPoempelPosition(i); //do abstraction Layer 3 check
+                ref_partArray[iterator]->m_a2.SideLength=analyse.getKantenLaenge(i);//do abstraction Layer 2 check
                 shift(poempel,1);
                 ref_partArray[iterator]->m_a3.shift(j);//rotate information
+                ref_partArray[iterator]->m_a2.shift(j);//rotate information
                 iterator++;
             }
         }
@@ -432,7 +434,9 @@ bool analyseParts::getImages(){
         }
         mask.setCorners(corners);
         vector<double> tmpPoempelPosition={0,0,0,0,0,0,0,0};//TODO somehow make this code section bearable
-        mask.setTabs(analyseContour(corners,contours[0],tmpPoempelPosition));
+        vector<double> tmpKantenLaenge=   {0,0,0,0,0,0,0,0};
+        mask.setTabs(analyseContour(corners,contours[0],tmpPoempelPosition,tmpKantenLaenge));
+        mask.setKantenLaenge(tmpKantenLaenge);
         mask.setPoempelPosition(tmpPoempelPosition);
         mask.setLens(analyseLens(lens, corners));
         mask.setMidpoint(calcMidpoint(corners));
@@ -638,7 +642,7 @@ vector<Point> analyseParts::findCorners(vector<Point> contour, Point center){
     if(DISPLAY) imshow("draw",drawing);
     return corners; 
 }
-unsigned char analyseParts::analyseContour(vector<Point> corners, vector<Point> contour,vector<double>& PoempelPosition){
+unsigned char analyseParts::analyseContour(vector<Point> corners, vector<Point> contour,vector<double>& PoempelPosition, vector<double>& KantenLaenge){
 
     vector<Point> contour_right;
     vector<Point> contour_top;
@@ -1078,6 +1082,7 @@ unsigned char analyseParts::analyseContour(vector<Point> corners, vector<Point>
     diff = corners[0] - contour_right_new[max_dist_idx];
     PoempelPosition[3] = cv::sqrt(diff.x*diff.x + diff.y*diff.y);
 
+
     /*-------------------------------------*/
     unsigned char tabs = 0;
     int poembel_threshold = 15;
@@ -1160,7 +1165,7 @@ unsigned char analyseParts::analyseContour(vector<Point> corners, vector<Point>
             max_dist_idx = i;
         }
     }
-        //saves length between Corners and Poempel left
+        //saves length between Corners and Poempel bottom
     diff = corners[0] - contour_bottom_new[max_dist_idx];
     PoempelPosition[4] = cv::sqrt(diff.x*diff.x + diff.y*diff.y);
     diff = corners[1] - contour_bottom_new[max_dist_idx];
@@ -1175,6 +1180,15 @@ unsigned char analyseParts::analyseContour(vector<Point> corners, vector<Point>
     if (abs(ref_bottom - contour_bottom_new[max_dist_idx].y) < poembel_threshold) {
         tabs |= (0 << BOTTOM);
     }
+
+    diff=corners[2] - corners[0];
+    KantenLaenge[2] = cv::sqrt(diff.x*diff.x + diff.y*diff.y);//right
+    diff=corners[1] - corners[3];
+    KantenLaenge[6] = cv::sqrt(diff.x*diff.x + diff.y*diff.y);//left
+    diff=corners[0] - corners[1];
+    KantenLaenge[4] = cv::sqrt(diff.x*diff.x + diff.y*diff.y);
+    diff=corners[3] - corners[2];
+    KantenLaenge[0] = cv::sqrt(diff.x*diff.x + diff.y*diff.y);
     return tabs;
 }
 
diff --git a/Source/functions/AbstractionLayers/Layer1/AbstractionLayer_1.h b/Source/functions/AbstractionLayers/Layer1/AbstractionLayer_1.h
index 66ea9f2..fd36c10 100644
--- a/Source/functions/AbstractionLayers/Layer1/AbstractionLayer_1.h
+++ b/Source/functions/AbstractionLayers/Layer1/AbstractionLayer_1.h
@@ -79,12 +79,15 @@ public:
     Point getMidpoint(){return midpoint;}
     void setMidpoint(Point m ){midpoint = m;}
     vector<double> getPoempelPosition(){return PoempelPosition;}
+    vector<double> getKantenLaenge(){return KantenLaenge;}
     void setPoempelPosition(vector<double>& newPP){PoempelPosition=newPP;}
+    void setKantenLaenge(vector<double>& newKL){KantenLaenge=newKL;}
     vector<Point> getCorners(){return corners;}
 
 private:
     Mat image;
     vector<double> PoempelPosition;
+    vector<double> KantenLaenge;
     vector<Point> corners;
     vector<vector<Point>> contour;
     vector<Vec4i> hierarchy;
@@ -104,12 +107,13 @@ public:
     unsigned char getTabs(int i){if(i>= nr_parts)return masks[nr_parts-1].getTabs(); else return masks[i].getTabs();}
     vector<double> getLen(int i ){return masks[i].getLen();}
     vector<double> getPoempelPosition(int i){return masks[i].getPoempelPosition();}
+    vector<double> getKantenLaenge(int i){return masks[i].getKantenLaenge();}
     vector<double> analyseLens(vector<double>, vector<Point>);
     Point calcMidpoint(vector<Point>);
     Point getMidpoint(int i){return masks[i].getMidpoint();}
     Point findCenter(Mat);
     vector<Point> findCorners(vector<Point>,Point);
-    unsigned char analyseContour(vector<Point>, vector<Point>,vector<double>&);
+    unsigned char analyseContour(vector<Point>, vector<Point>,vector<double>&,vector<double>&);
     Mat makeBorder(Mat&);
     Mat readImages(int);
     Mat morphDilateErode(Mat&);
diff --git a/Source/functions/AbstractionLayers/Layer2_KantenLaenge/AbstractionLayer_KantenLaenge.cpp b/Source/functions/AbstractionLayers/Layer2_KantenLaenge/AbstractionLayer_KantenLaenge.cpp
new file mode 100644
index 0000000..cbcca34
--- /dev/null
+++ b/Source/functions/AbstractionLayers/Layer2_KantenLaenge/AbstractionLayer_KantenLaenge.cpp
@@ -0,0 +1,90 @@
+#include "AbstractionLayer_KantenLaenge.h"
+#include "../../../header.h"
+
+bool AbstractionLayer_KantenLaenge::PreProcessing(coor mySize,  const vector<Part*>* partArray)
+{
+    //get layer information here
+    cout << "Abstraction Poempel Position Preprocessing...  " << flush;
+
+    InitialiseConstraintMatrixSize(mySize.col, mySize.row);
+
+    cout << "Done" << endl;
+    return true;
+}
+
+//it through qualityVector and removes all that do not trigger PlaceOfPartGood
+bool AbstractionLayer_KantenLaenge::EvaluateQuality (const coor constraintCoordinate, qualityVector& qVector)
+{
+    for(int i = 0;i<qVector.size();i++)
+    {
+        float value = PlaceOfPartGood(constraintCoordinate, qVector[i].second->m_a2.SideLength);
+        qVector[i].first=value;
+    }
+}
+
+bool AbstractionLayer_KantenLaenge::SetConstraintOnPosition(const coor constraintCoordinate, const AbstractionLayer_KantenLaenge_Properties constraint)
+{
+    m_constraintMatrix[constraintCoordinate.col][constraintCoordinate.row].SideLength=constraint.SideLength;
+}
+
+bool AbstractionLayer_KantenLaenge::RemoveConstraintOnPosition(const coor constraintCoordinate)
+{
+    m_constraintMatrix[constraintCoordinate.col][constraintCoordinate.row].SideLength={0,0,0,0,0,0,0,0};
+}
+
+float AbstractionLayer_KantenLaenge::PlaceOfPartGood(coor myCoor, vector<double> myPart)
+{
+    vector<double> comparePosition={0,0,0,0,0,0,0,0};
+    float sum=0;
+    //create negativePart, watch out for edges
+    if(myCoor.col>0 && m_constraintMatrix[myCoor.col-1][myCoor.row].SideLength[3])//get right data from left
+    {
+        comparePosition[6]=m_constraintMatrix[myCoor.col-1][myCoor.row].SideLength[3];
+        comparePosition[7]=m_constraintMatrix[myCoor.col-1][myCoor.row].SideLength[2];
+        //sum absolute difference
+        sum+=abs(comparePosition[6]-myPart[6]);
+        sum+=abs(comparePosition[7]-myPart[7]);
+    }
+    if(myCoor.row>0 && m_constraintMatrix[myCoor.col][myCoor.row-1].SideLength[5])//get bot data from top
+    {
+        comparePosition[0]=m_constraintMatrix[myCoor.col][myCoor.row-1].SideLength[5];
+        comparePosition[1]=m_constraintMatrix[myCoor.col][myCoor.row-1].SideLength[4];
+        //sum absolute difference
+        sum+=abs(comparePosition[0]-myPart[0]);
+        sum+=abs(comparePosition[1]-myPart[1]);
+
+    }
+    if(myCoor.col<m_constraintMatrix.size()-1 && m_constraintMatrix[myCoor.col+1][myCoor.row].SideLength[7])// get left data from right
+    {
+        comparePosition[2]=m_constraintMatrix[myCoor.col+1][myCoor.row].SideLength[7];
+        comparePosition[3]=m_constraintMatrix[myCoor.col+1][myCoor.row].SideLength[6];
+        //sum absolute difference
+        sum+=abs(comparePosition[2]-myPart[2]);
+        sum+=abs(comparePosition[3]-myPart[3]);
+
+    }
+
+    if(myCoor.row<m_constraintMatrix[0].size()-1 && m_constraintMatrix[myCoor.col][myCoor.row+1].SideLength[1])//get top data from bot
+    {
+        comparePosition[4]=m_constraintMatrix[myCoor.col][myCoor.row+1].SideLength[1];
+        comparePosition[5]=m_constraintMatrix[myCoor.col][myCoor.row+1].SideLength[0];
+        //sum absolute difference
+        sum+=abs(comparePosition[4]-myPart[4]);
+        sum+=abs(comparePosition[5]-myPart[5]);
+
+    }
+    if(sum>500)
+        return 0;
+    if(sum==0)
+        return 1;
+    sum/=500;
+    return 1-sum;
+    //check vector against negative part, use sad
+    //return of well it fits within threshold
+}
+
+//shifts vector i steps to the right (8-2i to the left)
+void AbstractionLayer_KantenLaenge_Properties::shift(int i)
+{
+    rotate(SideLength.begin(),SideLength.begin()+(8-2*i),SideLength.end());
+}
diff --git a/Source/functions/AbstractionLayers/Layer2_KantenLaenge/AbstractionLayer_KantenLaenge.h b/Source/functions/AbstractionLayers/Layer2_KantenLaenge/AbstractionLayer_KantenLaenge.h
new file mode 100644
index 0000000..9dcb753
--- /dev/null
+++ b/Source/functions/AbstractionLayers/Layer2_KantenLaenge/AbstractionLayer_KantenLaenge.h
@@ -0,0 +1,22 @@
+#pragma once
+
+#include "AbstractionLayer_KantenLaenge_Properties.h"
+#include "../AbstraktionLayer_Base.h"
+#include "opencv2/highgui/highgui.hpp"
+#include "opencv2/imgproc/imgproc.hpp"
+
+using namespace std;
+using namespace cv;
+
+class AbstractionLayer_KantenLaenge : public AbstractionLayer_Base<AbstractionLayer_KantenLaenge_Properties>
+{
+public:
+    bool PreProcessing(coor mySize, const vector<Part*>* partArray) final ;
+    bool EvaluateQuality ( coor constraintCoordinate, qualityVector& qVector)final;
+    bool SetConstraintOnPosition( coor constraintCoordinate, AbstractionLayer_KantenLaenge_Properties constraint)final;
+    bool RemoveConstraintOnPosition( coor constraintCoordinate)final;
+
+    float PlaceOfPartGood(coor myCoor, vector<double> myPart);
+
+private:
+};
\ No newline at end of file
diff --git a/Source/functions/AbstractionLayers/Layer2_KantenLaenge/AbstractionLayer_KantenLaenge_Properties.h b/Source/functions/AbstractionLayers/Layer2_KantenLaenge/AbstractionLayer_KantenLaenge_Properties.h
new file mode 100644
index 0000000..08a20e8
--- /dev/null
+++ b/Source/functions/AbstractionLayers/Layer2_KantenLaenge/AbstractionLayer_KantenLaenge_Properties.h
@@ -0,0 +1,19 @@
+
+#pragma once
+#include <vector>
+using namespace std;
+class AbstractionLayer_KantenLaenge_Properties
+{
+public:
+    AbstractionLayer_KantenLaenge_Properties():SideLength({0,0,0,0,0,0,0,0}){}
+    float getSideLength(int i){if (i<8 && i>=0)return SideLength[i]; else return -1;};
+    void shift(int i);
+private:
+
+    vector<double> SideLength;
+    friend class AbstractionLayer_KantenLaenge;
+    friend class AbstractionLayer_PoempelPosition;
+    friend class AbstractionLayer_1;
+};
+
+
diff --git a/Source/functions/AbstractionLayers/Layer_Histogram/AbstractionLayer_Histogram.cpp b/Source/functions/AbstractionLayers/Layer_Histogram/AbstractionLayer_Histogram.cpp
deleted file mode 100644
index 6b9f864..0000000
--- a/Source/functions/AbstractionLayers/Layer_Histogram/AbstractionLayer_Histogram.cpp
+++ /dev/null
@@ -1,176 +0,0 @@
-//
-// Created by Niko on 1/11/2018.
-//
-#include "../../../header.h"
-#include "AbstractionLayer_Histogram.h"
-
-using namespace cv;
-
-Mat HistogramComparer::readImages(int count)
-{
-    char name[100];
-    Mat corr;
-    Mat ref_gray;
-
-    sprintf(name, PATH, count);
-    Mat src = imread(name, 1);
-   // namedWindow("UP1", WINDOW_AUTOSIZE);
-    //imshow("UP1",src);
-    if (!src.data)
-    {
-        cerr << "Problem loading image!!!" << endl;
-        return src;
-    }
-
-    if(DISPLAY)imshow("src",src);
-
-    Mat im_color;
-    cvtColor(src, im_color, COLOR_BGR2HSV);
-    return im_color;
-
-}
-
-bool AbstractionLayer_Histogram::PreProcessing(coor mySize,  const vector<Part*>* partArray){
-   // HistogramComparer localImage;
-    cout << "Abstraction 2 Preprocessing...  " << flush;
-    const vector<Part*>& ref_partArray = *partArray;
-    HistogramComparer analyse(mySize.row*mySize.col);
-    Part buf;
-    int iterator=0;
-    if(!analyse.getImages())
-    {
-        cerr << "Error occured in getImages!" << endl;
-        return false;
-    }
-    else // hier werden alle vier verschiedenen Rotationsarten 'gleichzeitig' abgespeichert
-        //TODO rows and cols
-
-        for(int i = 0; i < mySize.row*mySize.col; i++)
-        {
-            Mat src_img1 = analyse.readImages(i);
-            Mat hsv_img1;
-            /// Convert to HSV
-            cvtColor(src_img1, hsv_img1, COLOR_BGR2HSV);
-
-            /// Using 50 bins for hue and 60 for saturation
-            int h_bins = 50;
-            int s_bins = 60;
-            int histSize[] = {h_bins, s_bins};
-
-            // hue varies from 0 to 179, saturation from 0 to 255
-            float h_ranges[] = {0, 180};
-            float s_ranges[] = {0, 256};
-
-            const float *ranges[] = {h_ranges, s_ranges};
-
-            // Use the o-th and 1-st channels
-            int channels[] = {0, 1};
-
-            /// Histograms
-            MatND hist_img1;
-
-            /// Calculate the histograms for the HSV images
-            calcHist(&hsv_img1, 1, channels, Mat(), hist_img1, 2, histSize, ranges, true, false);
-            // normalize(hist_img1, hist_img1, 0, 1, NORM_MINMAX, -1, Mat());
-
-            ref_partArray[iterator]->m_his.image=hsv_img1;
-            iterator++;
-
-        }
-
-
-    InitialiseConstraintMatrixSize(mySize.col, mySize.row); //col row switched in this function
-
-    cout << "Done!" << endl;
-    return true;
-
-}
-
-bool AbstractionLayer_Histogram::EvaluateQuality (const coor constraintCoordinate, qualityVector& qVector){
-
-    //evaluateQuality = evaluateProbabilaty
-    for(int i = 0;i < qVector.size();i++)
-    {
-        if(PlaceOfPartGood(constraintCoordinate, qVector[i].second->m_his.image))
-        {
-            qVector[i].first=1;
-            continue;
-        }
-        if(constraintCoordinate.row<1 || constraintCoordinate.col < 1 )
-            qVector[i].first=0.8;
-        else
-            qVector[i].first=0;
-    }
-
-
-}
-bool AbstractionLayer_Histogram::PlaceOfPartGood(coor myCoor, Mat& myPart)
-{
-    //sets coordinates to correct position for layer
-
-
-    if( myCoor.row == 1 && myCoor.col == 1){return true;}
-    else if(myCoor.col == 1 && myCoor.row >1){
-        if(CompareHistogram(m_constraintMatrix[myCoor.col][myCoor.row-1].image, myPart)){
-            return true;
-        }
-        else return false;
-    }
-
-    else if( myCoor.row == 1 && myCoor.col >1){
-        if(CompareHistogram(m_constraintMatrix[myCoor.col-1][myCoor.row].image, myPart)){
-            return true;
-        }
-        else return false;
-    }
-    else if (myCoor.col > 1 && myCoor.row >1){
-        if(     CompareHistogram(m_constraintMatrix[myCoor.col][myCoor.row-1].image, myPart) &&
-                CompareHistogram(m_constraintMatrix[myCoor.col-1][myCoor.row].image, myPart)){
-
-            return true;
-        }
-        else return false;
-    }else return false;
-
-
-}
-
-bool AbstractionLayer_Histogram::CompareHistogram(Mat hist_img1,Mat hist_img2)
-{
-    // Correlation
-    double Correlation = compareHist(hist_img1, hist_img2, CV_COMP_CORREL);
-
-    if(Correlation > 0.95 ){
-
-        return true;
-    }
-    else
-        return false;
-}
-
-bool AbstractionLayer_Histogram::SetConstraintOnPosition(const coor constraintCoordinate, const AbstractionLayer_Histogram_Properties constraint)
-{
-    m_constraintMatrix[constraintCoordinate.col][constraintCoordinate.row].image=constraint.image;
-    //m_constraintMatrix[constraintCoordinate.col+1][constraintCoordinate.row+1].m_connections=constraint.m_connections;
-}
-
-bool AbstractionLayer_Histogram::RemoveConstraintOnPosition(const coor constraintCoordinate)
-{
-    Mat dummy(1,1,0);
-    m_constraintMatrix[constraintCoordinate.col][constraintCoordinate.row].image = dummy;
-}
-bool HistogramComparer::getImages() {
-
-    Mat src;
-
-    for (int i = 0; i < nr_parts; i++) {
-        if (DISPLAY) cout << "Bild " << i << endl;
-        Mat img = readImages(i);
-
-        if (!img.data) {
-            cerr << "Error: No pic found!!" << endl;
-            return false;
-        }
-        else return true;
-    }
-}
\ No newline at end of file
diff --git a/Source/functions/AbstractionLayers/Layer_Histogram/AbstractionLayer_Histogram.h b/Source/functions/AbstractionLayers/Layer_Histogram/AbstractionLayer_Histogram.h
deleted file mode 100644
index 9c69ff8..0000000
--- a/Source/functions/AbstractionLayers/Layer_Histogram/AbstractionLayer_Histogram.h
+++ /dev/null
@@ -1,43 +0,0 @@
-//
-// Created by Niko on 1/11/2018.
-//
-
-#ifndef MPK_PUZZLE_ABSTRACTIONLAYER_HISTOGRAM_H
-#define MPK_PUZZLE_ABSTRACTIONLAYER_HISTOGRAM_H
-#define DISPLAY false
-//#define PATH "..\\..\\..\\pieces\\%04d.jpg"
-#include "opencv2/highgui/highgui.hpp"
-#include "opencv2/imgproc/imgproc.hpp"
-#include "AbstractionLayer_Histogram_Properties.h"
-#include "../AbstraktionLayer_Base.h"
-
-using namespace std;
-using namespace cv;
-
-class AbstractionLayer_Histogram : public AbstractionLayer_Base<AbstractionLayer_Histogram_Properties>
-{
-public:
-    bool PreProcessing(coor mySize, const vector<Part*>* partArray) override ;
-    bool EvaluateQuality ( coor constraintCoordinate, qualityVector& qVector)override;
-    bool RemoveConstraintOnPosition( coor constraintCoordinate)override;
-    bool PlaceOfPartGood(coor myCoor, Mat& myPart);
-    bool SetConstraintOnPosition( coor constraintCoordinate, AbstractionLayer_Histogram_Properties constraint)override;
-    qualityVector returnInBox(vector<Part>& PuzzleBox);
-    void printConstraintMatrix();
-    bool CompareHistogram(Mat Part, Mat RefPart);
-
-private:
-};
-
-class HistogramComparer{
-public:
-    explicit HistogramComparer(int s = 1008): nr_parts(s){}
-    Mat readImages(int);
-    bool getImages();
-private:
-    int nr_parts;
-
-};
-
-#endif //MPK_PUZZLE_ABSTRACTIONLAYER_HISTOGRAM_H
-
diff --git a/Source/functions/AbstractionLayers/Layer_Histogram/AbstractionLayer_Histogram_Properties.h b/Source/functions/AbstractionLayers/Layer_Histogram/AbstractionLayer_Histogram_Properties.h
deleted file mode 100644
index bb1270a..0000000
--- a/Source/functions/AbstractionLayers/Layer_Histogram/AbstractionLayer_Histogram_Properties.h
+++ /dev/null
@@ -1,29 +0,0 @@
-//
-// Created by Niko on 1/11/2018.
-//
-
-#ifndef MPK_PUZZLE_ABSTRACTIONLAYER_HISTOGRAM_PROPERTIES_H
-#define MPK_PUZZLE_ABSTRACTIONLAYER_HISTOGRAM_PROPERTIES_H
-#include <stdint.h>
-#include "opencv2/highgui/highgui.hpp"
-#include "opencv2/imgproc/imgproc.hpp"
-
-using namespace cv;
-class AbstractionLayer_Histogram_Properties
-{
-public:
-    AbstractionLayer_Histogram_Properties() : Correlation(-1){}
-    double getCorrelation(){return Correlation;}
-    Mat getmHistogram(){return m_Histogram;}
-
-private:
-
-    double Correlation;
-    Mat m_Histogram;
-    Mat image;
-    friend class AbstractionLayer_Histogram;
-
-
-};
-#endif //MPK_PUZZLE_ABSTRACTIONLAYER_HISTOGRAM_PROPERTIES_H
-
diff --git a/Source/functions/solve/puzzleExtension.cpp b/Source/functions/solve/puzzleExtension.cpp
index 59b6cea..aa93449 100644
--- a/Source/functions/solve/puzzleExtension.cpp
+++ b/Source/functions/solve/puzzleExtension.cpp
@@ -70,7 +70,7 @@ void Puzzle::removeConstrains(coor removeCoordinates)
     this->a3.RemoveConstraintOnPosition(removeCoordinates);
     this->a4.RemoveConstraintOnPosition(removeCoordinates);
     this->acm.RemoveConstraintOnPosition(removeCoordinates);
-    this->his.RemoveConstraintOnPosition(removeCoordinates);
+    this->a2.RemoveConstraintOnPosition(removeCoordinates);
     //TODO!! Add other layer remove here
 }
 void Puzzle::setConstraints(coor setConstraints, Part* constraintPiece)
@@ -93,7 +93,7 @@ void Puzzle::setConstraints(coor setConstraints, Part* constraintPiece)
     this->acm.SetConstraintOnPosition(setConstraints,constraintPiece->m_acm);
 
     //his
-    this->his.SetConstraintOnPosition(setConstraints,constraintPiece->m_his);
+    this->a2.SetConstraintOnPosition(setConstraints,constraintPiece->m_a2);
     //TODO!! Add other layer remove here
 }
 
diff --git a/Source/functions/solve/structure.cpp b/Source/functions/solve/structure.cpp
index 883f2bd..9a66c18 100755
--- a/Source/functions/solve/structure.cpp
+++ b/Source/functions/solve/structure.cpp
@@ -58,27 +58,25 @@ coor calculateNextCoor(vector<LogEntry>& log, Puzzle& puzzleMat)
 {
 
     if (log.size() == 1)
-//        return {0,0};
-return {1,1};
+        return {0,0};
 
     unsigned int col= log.rbegin()[1].myCoor.col;
     unsigned int row= log.rbegin()[1].myCoor.row;
     //level 2 edges first
 
-//    if(col == 0 && row < 27)
-//        return {col,++row};
-//    if(row== 27 && col < 35)
-//        return {++col,row};
-//    if(col == 35 && row >0)
-//        return {col, --row};
-//    if(col >1&& row ==0)
-//        return{--col,row};
-//    if(col==1 && row==0)
-//        return {1,1};
+    if(col == 0 && row < 27)
+        return {col,++row};
+    if(row== 27 && col < 35)
+        return {++col,row};
+    if(col == 35 && row >0)
+        return {col, --row};
+    if(col >1&& row ==0)
+        return{--col,row};
+    if(col==1 && row==0)
+        return {1,1};
 
-
-//    log.pop_back();//vis only!!!
-//    puzzleMat.resultImage(log);//vis only!!!
+    log.pop_back();//vis only!!!
+    puzzleMat.resultImage(log);//vis only!!!
 
 
     if(row<puzzleMat.getSizeAsCoor().row-2) row++;
@@ -104,10 +102,10 @@ void solve(vector<LogEntry>& log,Puzzle& puzzleMat)
     //TODO!! Add more layers here
     switch(log.back().abstractionLevel)
     {
-        case 10://pömpel
+        case 0://pömpel
             puzzleMat.a1.EvaluateQuality(log.back().myCoor,log.back().PieceCollector);
         break;
-        case 2://SURFFeature
+        case 4://SURFFeature
 //            return;
             puzzleMat.a4.EvaluateQuality(log.back().myCoor,log.back().PieceCollector);
             break;
@@ -117,8 +115,8 @@ void solve(vector<LogEntry>& log,Puzzle& puzzleMat)
         case 1://color
             puzzleMat.acm.EvaluateQuality(log.back().myCoor,log.back().PieceCollector);
             break;
-        case 0://histogram
-            puzzleMat.his.EvaluateQuality(log.back().myCoor,log.back().PieceCollector);
+        case 2://KantenLaenge
+            puzzleMat.a2.EvaluateQuality(log.back().myCoor,log.back().PieceCollector);
             break;
         case -1://random
             setsolution(log,puzzleMat);
diff --git a/Source/header/input.h b/Source/header/input.h
index 794e16b..61f13be 100755
--- a/Source/header/input.h
+++ b/Source/header/input.h
@@ -10,7 +10,7 @@
 #include "../functions/AbstractionLayers/Layer3_PoempelPosition/AbstractionLayer_PoempelPosition_Properties.h"
 #include "../functions/AbstractionLayers/Layer_ColorMatching/AbstractionLayer_ColorMatching_Properties.h"
 #include "../functions/AbstractionLayers/Layer_SURFFeatures/AbstractionLayer_SURFFeatures_Properties.h"
-#include "../functions/AbstractionLayers/Layer_Histogram/AbstractionLayer_Histogram_Properties.h"
+#include "../functions/AbstractionLayers/Layer2_KantenLaenge/AbstractionLayer_KantenLaenge_Properties.h"
 class LayerContainer;
 
 class Part
@@ -47,7 +47,7 @@ public:
     AbstractionLayer_PoempelPosition_Properties m_a3;
     AbstractionLayer_SURFFeatures_Properties m_a4;
     AbstractionLayer_ColorMatching_Properties m_acm;
-    AbstractionLayer_Histogram_Properties m_his;
+    AbstractionLayer_KantenLaenge_Properties m_a2;
 private:
     int32_t m_partID;
     uint8_t m_numOfRotations;
diff --git a/Source/header/solve.h b/Source/header/solve.h
index c1447ad..7ff0872 100755
--- a/Source/header/solve.h
+++ b/Source/header/solve.h
@@ -9,7 +9,7 @@
 #include "../functions/AbstractionLayers/Layer3_PoempelPosition/AbstractionLayer_PoempelPosition.h"
 #include "../functions/AbstractionLayers/Layer_SURFFeatures/AbstractionLayer_SURFFeatures.h"
 #include "../functions/AbstractionLayers/Layer_ColorMatching/AbstractionLayer_ColorMatching.h"
-#include "../functions/AbstractionLayers/Layer_Histogram/AbstractionLayer_Histogram.h"
+#include "../functions/AbstractionLayers/Layer2_KantenLaenge/AbstractionLayer_KantenLaenge.h"
 #include "../functions/AbstractionLayers/DestructionPower/DestructionPower.h"
 
 using namespace std;
@@ -57,7 +57,7 @@ public:
         if(!a3.PreProcessing({cols,rows}, &p_myBox)) return false;
         if(!a4.PreProcessing({cols,rows}, &p_myBox)) return false;
         if(!acm.PreProcessing({cols,rows}, &p_myBox)) return false;
-        if(!his.PreProcessing({cols,rows}, &p_myBox)) return false;
+        if(!a2.PreProcessing({cols,rows}, &p_myBox)) return false;
 
         return true;
     }
@@ -69,7 +69,7 @@ public:
     AbstractionLayer_PoempelPosition a3;
     AbstractionLayer_SURFFeatures a4;
     AbstractionLayer_ColorMatching acm;
-    AbstractionLayer_Histogram his;
+    AbstractionLayer_KantenLaenge a2;
 
     void removeConstrains(coor removeCoordinates);
     void setConstraints(coor setConstraints, Part *constraintPiece);