diff --git a/blocus.c b/blocus.c
new file mode 100644
index 0000000..efb0c3b
--- /dev/null
+++ b/blocus.c
@@ -0,0 +1,59 @@
+#include "blocus.h"
+#include <stdio.h>
+
+void initialize_game(Game *game, int size) {
+    game->size = size;
+    for (int i = 0; i < size; i++)
+        for (int j = 0; j < size; j++)
+            game->grid[i][j] = EMPTY;
+
+    game->player1_x = 0;
+    game->player1_y = 0;
+    game->player2_x = size - 1;
+    game->player2_y = size - 1;
+
+    game->grid[0][0] = PLAYER1;
+    game->grid[size - 1][size - 1] = PLAYER2;
+    game->current_player = PLAYER1;
+    game->winner = 0;
+}
+
+int is_valid_move(Game *game, int x, int y) {
+    return x >= 0 && x < game->size && y >= 0 && y < game->size && game->grid[x][y] == EMPTY;
+}
+
+void move_player(Game *game, int x, int y) {
+    if (game->current_player == PLAYER1) {
+        game->grid[game->player1_x][game->player1_y] = EMPTY;
+        game->player1_x = x;
+        game->player1_y = y;
+        game->grid[x][y] = PLAYER1;
+    } else {
+        game->grid[game->player2_x][game->player2_y] = EMPTY;
+        game->player2_x = x;
+        game->player2_y = y;
+        game->grid[x][y] = PLAYER2;
+    }
+}
+
+void block_cell(Game *game, int x, int y) {
+    if (is_valid_move(game, x, y)) {
+        game->grid[x][y] = BLOCKED;
+        game->current_player = (game->current_player == PLAYER1) ? PLAYER2 : PLAYER1;
+    }
+}
+
+int has_lost(Game *game) {
+    int x = (game->current_player == PLAYER1) ? game->player1_x : game->player2_x;
+    int y = (game->current_player == PLAYER1) ? game->player1_y : game->player2_y;
+
+    for (int dx = -1; dx <= 1; dx++) {
+        for (int dy = -1; dy <= 1; dy++) {
+            if (is_valid_move(game, x + dx, y + dy))
+                return 0;
+        }
+    }
+
+    game->winner = (game->current_player == PLAYER1) ? PLAYER2 : PLAYER1;
+    return 1; // Le joueur est bloqué
+}