diff --git a/src/main/c/Georg/tictactoe.c b/src/main/c/Georg/tictactoe.c
index 4e0ee11..fcade80 100644
--- a/src/main/c/Georg/tictactoe.c
+++ b/src/main/c/Georg/tictactoe.c
@@ -4,6 +4,8 @@
 
 #include "tictactoe.h"
 
+void printBoard();
+
 struct ticTacToe GAME;
 
 struct command COMMANDS[MAX_COMMANDS] = {
@@ -12,6 +14,7 @@ struct command COMMANDS[MAX_COMMANDS] = {
 };
 
 void startTicTacToe(){
+    setbuf(stdout, 0);
     printf( "%s\n", getWelcomeMessageTicTacToe() );
     printf( "%s\n\n", getRulesMessageTicTacToe() );
 
@@ -85,6 +88,22 @@ char* getUserInput(){
     return userInput;
 }
 
+void initializeBoard( bool board[BORAD_SIZE][BORAD_SIZE] ){
+    for (int i = 0; i < 3; ++i) {
+        for (int j = 0; j < 3; ++j) {
+            board[i][j] = 0;
+        }
+    }
+}
+
+int handleGameInput( char* input ){
+    if( strstr(input, "set") != NULL ){
+        return 1;
+    }else{
+        return -1;
+    }
+}
+
 int startMenu( int code ){
     if( code == -1 ){ // command test
         return 1;
@@ -105,21 +124,116 @@ int startMenu( int code ){
     return 0;
 }
 
+void printBoard(){
+    for( int i = 0; i < BORAD_SIZE*4+1; i++ ){
+        printf("-");
+    }
+    printf("\n");
+
+    for (int i = 0; i < 3; ++i) {
+        printf("| ");
+        for (int j = 0; j < 3; ++j) {
+            if( GAME.board[i][j] == true )
+                printf( "X" );
+            else
+                printf ( " " );
+
+            printf(" | ");
+        }
+        printf( "\n" );
+    }
+
+    for( int i = 0; i < BORAD_SIZE*4+1; i++ ){
+        printf("-");
+    }
+    printf("\n");
+}
+
+int* getMarkerParameters( char* input ){
+    int* array = (int*)malloc(2 * sizeof(int));
+
+    int index = strchr(input, ',') - input;
+    int firstArgument = input[index-1] - '0';
+    int secondArgument = input[index+1] - '0';
+
+    array[0] = firstArgument-1;
+    array[1] = secondArgument-1;
+
+    return array;
+}
+
+void setBoardMarker( bool board[BORAD_SIZE][BORAD_SIZE], int* params ){
+    board[params[0]][params[1]] = 1;
+}
+
+void handleGame(){
+    char* input = getUserInput();
+    int nextState = handleCommand( input );
+
+    // check commands, if no command found return for new Input
+    // gameCommands are saved and processed after this block
+    int gameCommand = -1;
+    if( nextState == -1 ){ // no stateCommand
+        gameCommand = handleGameInput( input );
+        if( gameCommand == -1 ){
+            printf("command not found!");
+            return;
+        }
+    }else{
+        GAME.currentState = nextState;
+        return;
+    }
+
+    // gameCommand processing
+    if( gameCommand == 1 ) { // set marker in field
+        int* params = getMarkerParameters( input );
+        setBoardMarker( GAME.board, params );
+        free(params);
+
+        printBoard();
+
+        if( playerHasWon( GAME.board ) ){
+            printf("\n\nDu hast gewonnwn!\n\n");
+            // start menu
+            GAME.currentState=0;
+        }
+    }
+}
+
+bool playerHasWon( bool board[BORAD_SIZE][BORAD_SIZE]){
+    bool player = 1;
+    // Überprüfe Zeilen und Spalten
+    for (int i = 0; i < 3; i++) {
+        // Überprüfe Zeilen
+        if ((board[i][0] == player && board[i][1] == player && board[i][2] == player) ||
+            // Überprüfe Spalten
+            (board[0][i] == player && board[1][i] == player && board[2][i] == player)) {
+            return true;  // Spieler hat gewonnen
+        }
+    }
+
+    // Überprüfe Diagonalen
+    if ((board[0][0] == player && board[1][1] == player && board[2][2] == player) ||
+        (board[0][2] == player && board[1][1] == player && board[2][0] == player)) {
+        return true;  // Spieler hat gewonnen
+    }
+
+    return false;
+}
+
 int startGame( int code ){
     if( code == -1 ){ // command test
         return 1;
     }
 
     printf("Welcome to the game!\n");
+    bool board[BORAD_SIZE][BORAD_SIZE];
+    initializeBoard( board );
 
-    while( GAME.currentState == 1 ){
-        int nextState = handleCommand( getUserInput() );
+    printBoard();
 
-        if( nextState == -1 ){
-            printf("command not found!");
-        }else{
-            GAME.currentState = nextState;
-        }
+    while( GAME.currentState == 1 ){
+        handleGame();
     }
 
     return 0;
diff --git a/src/main/c/Georg/tictactoe.h b/src/main/c/Georg/tictactoe.h
index 315b22c..efd1d1e 100644
--- a/src/main/c/Georg/tictactoe.h
+++ b/src/main/c/Georg/tictactoe.h
@@ -1,11 +1,15 @@
 #ifndef TICTACTOE_H
 #define TICTACTOE_H
 
+#include <stdbool.h>
+
 #define MAX_INPUT_LENGTH 20
 #define MAX_COMMANDS 3
+#define BORAD_SIZE 3
 
 struct ticTacToe{
     int currentState;
+    bool board[BORAD_SIZE][BORAD_SIZE];
 };
 
 // Typdefinition für einen Funktionszeiger
@@ -26,6 +30,11 @@ char* getWelcomeMessageTicTacToe(void);
 char* getRulesMessageTicTacToe(void);
 struct ticTacToe createTicTacToe();
 int handleCommand( char* input );
+void initializeBoard( bool board[3][3] );
+int handleGameInput( char* input );
+int* getMarkerParameters();
+void setBoardMarker( bool board[BORAD_SIZE][BORAD_SIZE], int* params );
+bool playerHasWon( bool board[BORAD_SIZE][BORAD_SIZE] );
 
 /* commands */
 commandFunction getCommandById(int id);
diff --git a/src/test/c/Georg/test_tictactoe.c b/src/test/c/Georg/test_tictactoe.c
index 2562299..6c2bcb5 100644
--- a/src/test/c/Georg/test_tictactoe.c
+++ b/src/test/c/Georg/test_tictactoe.c
@@ -105,4 +105,254 @@ void test_callCommandById_startGame(void){
 
     // assert
     TEST_ASSERT_EQUAL_PTR( startGame, actualCommand );
+}
+
+
+void test_initializeBoard(void){
+    // arrange
+    bool expectedBoard[BORAD_SIZE][BORAD_SIZE]={
+            {0,0,0},
+            {0,0,0},
+            {0,0,0}
+    };
+
+    // act
+    bool actualBoard[BORAD_SIZE][BORAD_SIZE];
+    initializeBoard(actualBoard);
+
+    // assert
+    for (size_t i = 0; i < BORAD_SIZE; i++) {
+        for (size_t ii = 0; ii < BORAD_SIZE; ii++) {
+            TEST_ASSERT_EQUAL_INT(expectedBoard[i][ii], actualBoard[i][ii]);
+        }
+    }
+}
+
+void test_handleGameInput(void){
+    // arrange
+    char* teststring = "set 3,4";
+    int expectedCommand = 1;
+
+    // act
+    int actualState = handleGameInput( teststring );
+
+    // assert
+    TEST_ASSERT_EQUAL_INT( expectedCommand, actualState );
+}
+
+void test_getMarkerParameters(void){
+    // arrange
+    char* teststring = "set 3,3";
+    int expectedParams[2] = {2, 2};
+
+    // act
+    int* actualParams = getMarkerParameters( teststring );
+
+    // assert
+    for( int i = 0; i < 2; i++ ){
+        TEST_ASSERT_EQUAL_INT( expectedParams[i], actualParams[i] );
+    }
+}
+
+void test_setBoardFields(){
+    // arrange
+    // arrange
+    bool board[3][3]={
+            {0,0,0},
+            {0,0,0},
+            {0,0,0}
+    };
+    int params[2] = {2,2};
+
+    // act
+    setBoardMarker( board, params );
+
+    // assert
+    TEST_ASSERT_EQUAL_INT( 1, board[2][2] );
+}
+
+void test_checkOnWin_vertically(void){
+    // arrange
+    bool board1[3][3]={
+            {0,0,1},
+            {0,0,1},
+            {0,0,1}
+    };
+
+    bool board2[3][3]={
+            {0,1,0},
+            {0,1,0},
+            {0,1,0}
+    };
+
+    bool board3[3][3]={
+            {1,0,0},
+            {1,0,0},
+            {1,0,0}
+    };
+
+    // act
+    bool result = playerHasWon( board1 );
+    bool result2 = playerHasWon( board2 );
+    bool result3 = playerHasWon( board3 );
+
+    // assert
+    TEST_ASSERT_EQUAL_INT( 1, result );
+    TEST_ASSERT_EQUAL_INT( 1, result2 );
+    TEST_ASSERT_EQUAL_INT( 1, result3 );
+}
+
+void test_negativ_checkOnWin_horizontally(void){
+    // arrange
+    bool board1[3][3]={
+            {1,0,0},
+            {0,0,0},
+            {0,0,0}
+    };
+
+    bool board2[3][3]={
+            {0,0,0},
+            {0,1,0},
+            {0,0,0}
+    };
+
+    bool board3[3][3]={
+            {0,0,0},
+            {0,0,0},
+            {0,0,1}
+    };
+
+    // act
+    bool result = playerHasWon( board1 );
+    bool result2 = playerHasWon( board2 );
+    bool result3 = playerHasWon( board3 );
+
+    // assert
+    TEST_ASSERT_EQUAL_INT( 0, result );
+    TEST_ASSERT_EQUAL_INT( 0, result2 );
+    TEST_ASSERT_EQUAL_INT( 0, result3 );
+}
+
+void test_negativ_checkOnWin_horizontally2(void){
+    // arrange
+    bool board1[3][3]={
+            {1,1,0},
+            {0,0,0},
+            {0,0,0}
+    };
+
+    bool board2[3][3]={
+            {0,0,0},
+            {0,1,1},
+            {0,0,0}
+    };
+
+    bool board3[3][3]={
+            {0,0,0},
+            {0,0,0},
+            {1,0,1}
+    };
+
+    // act
+    bool result = playerHasWon( board1 );
+    bool result2 = playerHasWon( board2 );
+    bool result3 = playerHasWon( board3 );
+
+    // assert
+    TEST_ASSERT_EQUAL_INT( 0, result );
+    TEST_ASSERT_EQUAL_INT( 0, result2 );
+    TEST_ASSERT_EQUAL_INT( 0, result3 );
+}
+
+void test_negativ_checkOnWin_vertically(void){
+    // arrange
+    bool board1[3][3]={
+            {1,0,0},
+            {0,0,0},
+            {0,0,0}
+    };
+
+    bool board2[3][3]={
+            {0,0,0},
+            {1,0,0},
+            {0,0,0}
+    };
+
+    bool board3[3][3]={
+            {0,0,0},
+            {0,0,0},
+            {1,0,0}
+    };
+
+    // act
+    bool result = playerHasWon( board1 );
+    bool result2 = playerHasWon( board2 );
+    bool result3 = playerHasWon( board3 );
+
+    // assert
+    TEST_ASSERT_EQUAL_INT( 0, result );
+    TEST_ASSERT_EQUAL_INT( 0, result2 );
+    TEST_ASSERT_EQUAL_INT( 0, result3 );
+}
+
+void test_negativ_checkOnWin_vertically2(void){
+    // arrange
+    bool board1[3][3]={
+            {0,1,0},
+            {0,0,0},
+            {0,0,0}
+    };
+
+    bool board2[3][3]={
+            {0,0,0},
+            {0,1,0},
+            {0,0,0}
+    };
+
+    bool board3[3][3]={
+            {0,0,0},
+            {0,0,0},
+            {0,1,0}
+    };
+
+    // act
+    bool result = playerHasWon( board1 );
+    bool result2 = playerHasWon( board2 );
+    bool result3 = playerHasWon( board3 );
+
+    // assert
+    TEST_ASSERT_EQUAL_INT( 0, result );
+    TEST_ASSERT_EQUAL_INT( 0, result2 );
+    TEST_ASSERT_EQUAL_INT( 0, result3 );
+}
+
+void test_negativ_checkOnWin_vertically3(void){
+    // arrange
+    bool board1[3][3]={
+            {0,0,1},
+            {0,0,0},
+            {0,0,0}
+    };
+
+    bool board2[3][3]={
+            {0,0,0},
+            {0,0,1},
+            {0,0,0}
+    };
+
+    bool board3[3][3]={
+            {0,0,0},
+            {0,0,0},
+            {0,0,1}
+    };
+
+    // act
+    bool result = playerHasWon( board1 );
+    bool result2 = playerHasWon( board2 );
+    bool result3 = playerHasWon( board3 );
+
+    // assert
+    TEST_ASSERT_EQUAL_INT( 0, result );
+    TEST_ASSERT_EQUAL_INT( 0, result2 );
+    TEST_ASSERT_EQUAL_INT( 0, result3 );
 }
\ No newline at end of file