diff --git a/klient/strategy.cpp b/klient/strategy.cpp
index d5f9d85..a12bdbd 100644
--- a/klient/strategy.cpp
+++ b/klient/strategy.cpp
@@ -225,6 +225,12 @@ State* state;
 
 // Algoritmy
 
+// modulení jako v Pythonu
+int py_mod(int a, int b)
+{
+	return (a % b + b) % b;
+}
+
 // otoč směr podle jiného otočení
 Direction combine_directions(Direction a, Direction b)
 {
@@ -246,33 +252,27 @@ Direction invert_direction(Direction a)
 // další políčko v daném směru
 Field* get_neighbour_field(Field* f, Direction direction)
 {
-	int neighbour_i, neighbour_j;
+	int neighbour_i = f->i;
+	int neighbour_j = f->j;
 	switch (direction)
 	{
 		case UP:
 			neighbour_i = f->i - 1;
-			neighbour_j = f->j;
 			break;
 		case DOWN:
 			neighbour_i = f->i + 1;
-			neighbour_j = f->j;
 			break;
 		case LEFT:
-			neighbour_i = f->i;
 			neighbour_j = f->j - 1;
 			break;
 		case RIGHT:
-			neighbour_i = f->i;
 			neighbour_j = f->j + 1;
 			break;
-		default:
-			neighbour_i = f->i;
-			neighbour_j = f->j;
 	}
 
 	// zajisti, aby souřadnice byly v rozsahu herní plochy
-	neighbour_i %= state->world.size();
-	neighbour_j %= state->world[0].size();
+	neighbour_i = py_mod(neighbour_i, state->world.size());
+	neighbour_j = py_mod(neighbour_j, state->world[0].size());
 	return state->world[neighbour_i][neighbour_j];
 }