diff --git a/src/main/java/de/tims/viergewinnt/ai/GuiTest.java b/src/main/java/de/tims/viergewinnt/ai/GuiTest.java
new file mode 100644
index 0000000..c8327ee
--- /dev/null
+++ b/src/main/java/de/tims/viergewinnt/ai/GuiTest.java
@@ -0,0 +1,21 @@
+package de.tims.viergewinnt.ai;
+
+import javax.swing.JFrame;
+
+public class GuiTest {
+
+	JFrame frame;
+	public GuiTest() {
+		frame = new JFrame();
+		frame.setSize(500, 500);
+		Logic logic = new Logic(6);
+		frame.add(logic.create4gewinntGui());
+		frame.setVisible(true);
+	}
+	
+	public static void main(String[] args) {
+		// TODO Auto-generated method stub
+		GuiTest testGui = new GuiTest();
+	}
+
+}
diff --git a/src/main/java/de/tims/viergewinnt/ai/Logic.java b/src/main/java/de/tims/viergewinnt/ai/Logic.java
new file mode 100644
index 0000000..91b14c5
--- /dev/null
+++ b/src/main/java/de/tims/viergewinnt/ai/Logic.java
@@ -0,0 +1,264 @@
+package de.tims.viergewinnt.ai;
+
+import java.awt.Color;
+import java.awt.GridLayout;
+import java.awt.event.ActionEvent;
+import java.awt.event.ActionListener;
+
+import javax.swing.BorderFactory;
+import javax.swing.BoxLayout;
+import javax.swing.JButton;
+import javax.swing.JLabel;
+import javax.swing.JPanel;
+
+public class Logic {
+	
+	private int[][] board;
+	private int currentPlayer = 1;
+	private int player1Score = 0;
+	private int player2Score = 0;
+	
+	public Logic(int size) {
+		 this.board = new int[size][size];
+		 this.buttons = new JButton[getBoardSize()];
+		 this.gamefield = new JLabel[getBoardSize() * getBoardSize()];
+    }
+
+    public void setField(int player, int row, int column) {
+		this.board[row][column] = player;
+	}
+	
+	public int getField(int row, int column) {
+		return this.board[row][column];
+	}
+	
+	public void clearField() {
+		this.board = new int[getBoardSize()][getBoardSize()];
+	}
+	
+	public int getBoardSize() {
+		return this.board.length;
+	}
+	
+	public void setCurrentPlayer(int player) {
+		this.currentPlayer = player;
+	}
+	
+	public int getCurrentPlayer() {
+		return this.currentPlayer;
+	}
+	
+	public void setPlayer1Score(int score) {
+		this.player1Score = score;
+	}
+	
+	public int getPlayer1Score() {
+		return this.player1Score;
+	}
+	
+	public void setPlayer2Score(int score) {
+		this.player2Score = score;
+	}
+	
+	public int getPlayer2Score() {
+		return this.player2Score;
+	}
+	
+	public int getFreePlace(int column) {
+		int size = getBoardSize() - 1;
+		while(getField(size, column) != 0) {
+			size--;
+			if(size < 0) {
+				return -1;
+			}
+		}
+		return size;
+	}
+	
+	public int playChip(int column) {
+		setField(getCurrentPlayer(), getFreePlace(column), column);
+		if(getFreePlace(column) == -1) {
+			buttons[column].setEnabled(false);
+		}
+		updateGui();
+		if(testForWin()) {
+			gameover();
+		} else if(!checkButtons()) {
+			gameover();
+		}
+		setCurrentPlayer((getCurrentPlayer() % 2) + 1);
+		return 0;
+	}
+	
+	public boolean checkButtons() {
+		boolean res = false;
+		for(int i = 0; i < buttons.length; i++) {
+			res = buttons[i].isEnabled() | res;
+		}
+		return res;
+	}
+	
+	JPanel contentPanel;
+	JPanel buttonPanel;
+	JPanel playfieldPanel;
+	JButton[] buttons;
+	JLabel[] gamefield;
+	
+	public JPanel create4gewinntGui() {
+		contentPanel = new JPanel();
+		contentPanel.setLayout(new BoxLayout(contentPanel, BoxLayout.PAGE_AXIS));	
+		buttonPanel = new JPanel(new GridLayout(1, buttons.length));
+		playfieldPanel = new JPanel(new GridLayout(buttons.length, buttons.length));
+		contentPanel.add(buttonPanel);
+		contentPanel.add(playfieldPanel);
+		
+		for(int i = 0; i < buttons.length; i++) {
+			buttons[i] = new JButton(Integer.toString(i+1));
+			buttons[i].addActionListener(new ButtonListener());
+			buttonPanel.add(buttons[i]);
+		}
+		
+		for(int i = 0; i < gamefield.length; i++) {
+			gamefield[i] = new JLabel();
+			gamefield[i].setBorder(BorderFactory.createLineBorder(Color.gray));
+			gamefield[i].setOpaque(true);
+			gamefield[i].setBackground(Color.white);
+			playfieldPanel.add(gamefield[i]);
+		}
+		
+		return contentPanel;
+	}
+	
+	public void updateGui() {
+		for(int i = 0; i < board.length; i++) {
+			for(int j = 0; j < board[i].length; j++) {
+				if(getField(i,j) == 0) {
+					gamefield[j + getBoardSize() * i].setBackground(Color.white);
+				} else if(getField(i,j) == 1) {
+					gamefield[j + getBoardSize() * i].setBackground(Color.red);
+				} else {
+					gamefield[j + getBoardSize() * i].setBackground(Color.yellow);
+				}
+			}
+		}
+	}
+	
+	class ButtonListener implements ActionListener {
+
+		@Override
+		public void actionPerformed(ActionEvent e) {
+			for(int i = 0; i < buttons.length; i++) {
+				if(e.getSource() == buttons[i]) {
+					playChip(i);
+					break;
+				}
+			}
+		}
+		
+	}
+	
+	public boolean testForWin() {
+		int player = getCurrentPlayer();
+		int chain = 0;
+		for(int i = 0; i < board[0].length; i++) {
+			for(int j = 0; j < board.length; j++) {
+				if(getField(j,i) == player) {
+					chain++;
+				} else {
+					chain = 0;
+				}
+				if(chain == 4) return true;
+			}
+		}
+		chain = 0;
+		for(int i = 0; i < board.length; i++) {
+			for(int j = 0; j < board[0].length; j++) {
+				if(getField(i,j) == player) {
+					chain++;
+				} else {
+					chain = 0;
+				}
+				if(chain == 4) return true;
+			}
+		}
+		chain = 0;
+		for(int i = 0; i < board.length - 3; i++) {
+			for(int j = 0; j < board[i].length - 3; j++) {
+				if(getField(i,j) == player) {
+					chain++;
+					while(true) {
+						i++; j++;
+						if(getField(i,j) == player) {
+							chain++;
+							if(chain == 4) return true;
+						} else {
+							chain = 0;
+							break;
+						}
+					}
+				}
+			}
+		}
+		chain = 0;
+		for(int i = 0; i < board.length - 3; i++) {
+			for(int j = board[i].length - 1; j > 2; j--) {
+				if(getField(i,j) == player) {
+					chain++;
+					while(true) {
+						i++; j--;
+						if(getField(i,j) == player) {
+							chain++;
+							if(chain == 4) return true;
+						} else {
+							chain = 0;
+							break;
+						}
+					}
+				}
+			}
+		}
+		return false;
+	}
+	
+	public int calcScore() {
+		int score = 1000;
+		for(int i = 0; i < board.length; i++) {
+			int oldScore = score;
+			for(int j = 0; j < board[i].length; j++) {
+				if(getField(i,j) != 0) {
+					score += 10;
+				}
+			}
+			if(score - (10 * board[0].length) == oldScore) {
+				score += (10 * board[0].length);
+			}
+		}
+		for(int i = 0; i < board[0].length; i++) {
+			for(int j = 0; j < board.length; j++) {
+				if(getField(j,i) == 0) {
+					break;
+				}
+				if(j == board.length - 1) {
+					score += (10 * board.length);
+				}
+			}
+		}
+		if(score == (1000 + 3 * (10 * board.length * board[0].length))) {
+			score += 500;
+		}
+		return score;
+	}
+	
+	public void gameover() {
+		if(getCurrentPlayer() == 1) {
+			setPlayer1Score(calcScore());
+		} else {
+			setPlayer2Score(calcScore());
+		}
+		clearField();
+		for(int i = 0; i < getBoardSize(); i++) {
+			buttons[i].setEnabled(true);
+		}
+		updateGui();
+	}
+}
diff --git a/src/test/java/de/tims/viergewinnt/ai/LogicTest.java b/src/test/java/de/tims/viergewinnt/ai/LogicTest.java
new file mode 100644
index 0000000..9800775
--- /dev/null
+++ b/src/test/java/de/tims/viergewinnt/ai/LogicTest.java
@@ -0,0 +1,348 @@
+package de.tims.viergewinnt.ai;
+
+import static org.junit.jupiter.api.Assertions.*;
+
+import java.util.stream.Stream;
+
+import org.junit.jupiter.api.BeforeEach;
+import org.junit.jupiter.api.Test;
+import org.junit.jupiter.params.ParameterizedTest;
+import org.junit.jupiter.params.provider.Arguments;
+import org.junit.jupiter.params.provider.MethodSource;
+
+class LogicTest {
+	
+	private Logic testObj;
+
+	@BeforeEach
+	void setUp() throws Exception {
+		testObj = new Logic(6);
+	}
+
+	@ParameterizedTest(name = "[{index}] {0} Player {2} {3}")
+	@MethodSource("playfieldResults")
+	void testForWinTest(String testName, int[][] playfield, int player, boolean expectedResult) {
+		for(int i = 0; i < playfield.length; i++) {
+			for(int j = 0; j < playfield[i].length; j++) {
+				testObj.setField(playfield[i][j], i, j);
+			}
+		}
+		testObj.setCurrentPlayer(player);
+		
+		boolean realResult = testObj.testForWin();
+		
+		assertEquals(expectedResult, realResult);
+	}
+	
+	@Test
+	void playChipTest() {
+		int column = 0;
+		int player = 1;
+		int expectedResult = 0;
+		testObj.create4gewinntGui();
+		testObj.setCurrentPlayer(player);
+		
+		int realResult = testObj.playChip(column);
+		
+		assertEquals(expectedResult == realResult, 1 == testObj.getField(5, 0));
+	}
+	
+	@Test
+	void changePlayerTo2Test() {
+		int column = 0;
+		int player = 1;
+		int expectedResult = 2;
+		testObj.create4gewinntGui();
+		testObj.setCurrentPlayer(player);
+		testObj.playChip(column);
+		
+		int realResult = testObj.getCurrentPlayer();
+		
+		assertEquals(expectedResult, realResult);
+	}
+	
+	@Test
+	void changePlayerTo1Test() {
+		int column = 0;
+		int player = 2;
+		int expectedResult = 1;
+		testObj.create4gewinntGui();
+		testObj.setCurrentPlayer(player);
+		testObj.playChip(column);
+		
+		int realResult = testObj.getCurrentPlayer();
+		
+		assertEquals(expectedResult, realResult);
+	}
+	
+	@ParameterizedTest(name = "[{index}] {0} with {1}")
+	@MethodSource("playfieldForScore")
+	void calcScoreTest(String testName, int[][] playfield, int expectedResult) {
+		for(int i = 0; i < playfield.length; i++) {
+			for(int j = 0; j < playfield[i].length; j++) {
+				testObj.setField(playfield[i][j], i, j);
+			}
+		}
+		
+		int realResult = testObj.calcScore();
+		
+		assertEquals(expectedResult, realResult);
+	}
+	
+	@Test
+	void setFieldPlayer1Test() {
+		int player = 1;
+		int row = 0;
+		int column = 0;
+		
+		testObj.setField(player, row, column);
+		
+		assertEquals(1, testObj.getField(row, column));
+	}
+	
+	@Test
+	void setFieldPlayer2Test() {
+		int player = 2;
+		int row = 0;
+		int column = 0;
+		
+		testObj.setField(player, row, column);
+		
+		assertEquals(player, testObj.getField(row, column));
+	}
+	
+	@Test
+	void getFieldTest() {
+		int player = 2;
+		int row = 0;
+		int column = 0;
+		
+		testObj.setField(player, row, column);
+		int realResult = testObj.getField(row, column);
+		
+		assertEquals(player, realResult);
+	}
+	
+	@Test
+	void setCurrentPlayerTest() {
+		int player = 2;
+		
+		testObj.setCurrentPlayer(player);
+		
+		assertEquals(player, testObj.getCurrentPlayer());
+	}
+	
+	@Test
+	void getCurrentPlayerTest() {
+		int player = 2;
+		
+		testObj.setCurrentPlayer(player);
+		int realResult = testObj.getCurrentPlayer();
+		
+		assertEquals(player, realResult);
+	}
+	
+	@Test
+	void setPlayer1ScoreTest() {
+		int expectedResult = 500;
+		testObj.setPlayer1Score(expectedResult);
+		
+		assertEquals(expectedResult, testObj.getPlayer1Score());
+	}
+	
+	@Test
+	void getPlayer1ScoreTest() {
+		int expectedResult = 500;
+		testObj.setPlayer1Score(expectedResult);
+		
+		int realResult = testObj.getPlayer1Score();
+		
+		assertEquals(expectedResult, realResult);
+	}
+	
+	@Test
+	void createGameLogicTest() {
+		int size = 6;
+		Logic expectedResult = testObj;
+		Logic realResult = new Logic(size);
+	  
+		assertEquals(expectedResult.getClass(), realResult.getClass());
+	}
+	
+	@ParameterizedTest(name = "[{index}] {0}")
+	@MethodSource("boardSizeParameters")
+	void getBoardSizeTest(String testName, int size) {
+		int expectedResult = size;
+		int realResult = new Logic(size).getBoardSize();
+		
+		assertEquals(expectedResult, realResult);
+	}
+	
+	@Test
+	void gameoverTest() {
+		testObj.setField(1, 0, 0);
+		testObj.create4gewinntGui();
+		
+		testObj.gameover();
+		
+		assertEquals(1010 == testObj.getPlayer1Score(), 0 == testObj.getField(0,0));
+	}
+	
+	@Test
+	void clearFieldTest() {
+		testObj.setField(1,  0, 0);
+		
+		testObj.clearField();
+		
+		assertEquals(0, testObj.getField(0, 0));
+	}
+	
+	@Test
+	void clearFieldTestCompleteClear() {
+		testObj.setField(1, 5, 5);
+		
+		testObj.clearField();
+		
+		assertEquals(0, testObj.getField(5, 5));
+	}
+	
+	@Test
+	void getFreePlaceTestWithEmptyField() {
+		assertEquals(testObj.getBoardSize() - 1, testObj.getFreePlace(0));
+	}
+	
+	@Test
+	void getFreePlaceTestWithFilledField() {
+		testObj.setField(1, testObj.getBoardSize() - 1, 0);
+		
+		assertEquals(testObj.getBoardSize() - 2, testObj.getFreePlace(0));
+	}
+	
+	@Test
+	void getFreePlaceTestWithAnyField() {
+		testObj.setField(1, testObj.getBoardSize() - 1, 0);
+		testObj.setField(1, testObj.getBoardSize() - 2, 0);
+		
+		assertEquals(testObj.getBoardSize() - 3, testObj.getFreePlace(0));
+	}
+	
+	@Test
+	void checkButtonsTestTrue() {
+		testObj.create4gewinntGui();
+		boolean expectedResult = true;
+		
+		boolean realResult = testObj.checkButtons();
+		
+		assertEquals(expectedResult, realResult);
+	}
+	
+	@Test
+	void checkButtonsTestFalse() {
+		testObj.create4gewinntGui();
+		boolean expectedResult = false;
+		for(int i = 0; i < testObj.buttons.length; i++) {
+			testObj.buttons[i].setEnabled(false);
+		}
+		
+		boolean realResult = testObj.checkButtons();
+		
+		assertEquals(expectedResult, realResult);
+	}
+	
+	private static Stream<Arguments> playfieldResults() {
+		int[][] playfield1 = {{0, 0, 0, 0, 0, 0}, 
+				   			  {0, 0, 0, 0, 0, 0},
+				   			  {1, 0, 0, 0, 0, 0},
+				   			  {1, 0, 0, 0, 0, 0},
+				   			  {1, 0, 0, 0, 0, 0},
+				   			  {1, 0, 0, 0, 0, 0}};
+		int[][] playfield2 = {{0, 0, 0, 0, 0, 0}, 
+	   			  			  {0, 0, 0, 0, 0, 0},
+	   			  			  {0, 0, 0, 1, 0, 0},
+	   			  			  {0, 0, 0, 1, 0, 0},
+	   			  			  {0, 0, 0, 1, 0, 0},
+	   			  			  {0, 0, 0, 1, 0, 0}};
+		int[][] playfield3 = {{0, 0, 0, 0, 0, 0}, 
+							  {0, 0, 0, 0, 0, 0},
+							  {0, 0, 0, 0, 0, 0},
+							  {0, 0, 0, 0, 0, 0},
+							  {0, 0, 0, 0, 0, 0},
+							  {1, 1, 1, 1, 0, 0}};
+		int[][] playfield4 = {{0, 0, 0, 0, 0, 0}, 
+							  {0, 0, 0, 0, 0, 0},
+							  {1, 0, 0, 0, 0, 0},
+							  {1, 1, 0, 0, 0, 0},
+							  {2, 2, 1, 0, 0, 0},
+							  {2, 2, 2, 1, 0, 0}};
+		int[][] playfield5 = {{0, 0, 0, 0, 0, 0}, 
+				  			  {0, 0, 0, 0, 0, 0},
+				  			  {0, 0, 0, 0, 0, 1},
+				  			  {0, 0, 0, 0, 1, 2},
+				  			  {0, 0, 0, 1, 2, 2},
+				  			  {0, 0, 1, 1, 2, 2}};
+		return Stream.of(
+				Arguments.of("emptyField", new int[6][6], 1, false),
+				Arguments.of("4 in column1 player1", playfield1, 1, true),
+				Arguments.of("4 in a column player1", playfield2, 1, true),
+				Arguments.of("4 in a row player1", playfield3, 1, true),
+				Arguments.of("4 diagonal right player1", playfield4, 1, true),
+				Arguments.of("4 diagonal left player1", playfield5, 1, true)
+				);
+	}
+	
+	private static Stream<Arguments> playfieldForScore() {
+		int[][] playfield1 = {{0, 0, 0, 0, 0, 0}, 
+	  			  			  {0, 0, 0, 0, 0, 0},
+	  			  			  {0, 0, 1, 2, 0, 0},
+	  			  			  {0, 0, 1, 2, 0, 0},
+	  			  			  {0, 0, 1, 2, 0, 0},
+	  			  			  {0, 0, 1, 1, 2, 0}};
+		int[][] playfield2 = {{0, 0, 0, 0, 0, 0}, 
+	  			  			  {0, 0, 0, 0, 0, 0},
+	  			  			  {0, 0, 0, 0, 0, 0},
+	  			  			  {0, 0, 0, 0, 0, 0},
+	  			  			  {0, 0, 0, 0, 0, 0},
+	  			  			  {1, 1, 1, 2, 2, 2}};
+		int[][] playfield3 = {{0, 0, 0, 0, 0, 0}, 
+							  {0, 0, 0, 0, 0, 0},
+							  {1, 1, 2, 2, 1, 2},
+							  {0, 0, 0, 0, 0, 0},
+							  {0, 0, 0, 0, 0, 0},
+							  {1, 1, 1, 2, 2, 2}};
+		int[][] playfield4 = {{2, 0, 0, 0, 0, 0}, 
+				  			  {2, 0, 0, 0, 0, 0},
+				  			  {1, 0, 0, 0, 0, 0},
+				  			  {2, 0, 0, 0, 0, 0},
+				  			  {1, 0, 0, 0, 0, 0},
+				  			  {1, 0, 0, 0, 0, 0}};
+		int[][] playfield5 = {{2, 0, 1, 0, 0, 0}, 
+							  {2, 0, 1, 0, 0, 0},
+							  {1, 0, 2, 0, 0, 0},
+							  {2, 0, 2, 0, 0, 0},
+							  {1, 0, 2, 0, 0, 0},
+							  {1, 0, 1, 0, 0, 0}};
+		int[][] playfield6 = {{1, 1, 1, 1, 2, 2}, 
+				  			  {2, 1, 1, 1, 1, 2},
+				              {2, 1, 1, 2, 1, 2},
+				              {2, 1, 1, 2, 1, 2},
+				              {2, 1, 2, 2, 1, 2},
+				              {2, 1, 2, 2, 1, 2}};
+		return Stream.of(
+				Arguments.of("emptyField", new int[6][6], 1000),
+				Arguments.of("9 chips played", playfield1, 1090),
+				Arguments.of("first row filled", playfield2, 1120),
+				Arguments.of("2 rows filled", playfield3, 1240),
+				Arguments.of("first column filled", playfield4, 1120),
+				Arguments.of("2 column filled", playfield5, 1240),
+				Arguments.of("fullyFilled", playfield6, 2580)
+				);
+	}
+	
+	private static Stream<Arguments> boardSizeParameters() {
+		return Stream.of(
+				Arguments.of("board with size 0", 0),
+				Arguments.of("board with size 6", 6)
+				);
+	}
+
+}