1 files changed, 15 insertions, 0 deletions

diff --git a/rules.js b/rules.js
index 137e3ff..1292291 100644
--- a/rules.js
+++ b/rules.js
@@ -242,6 +242,10 @@ function enemy_corps() { return (game.active !== P1) ? p1_corps : p2_corps }
 function friendly_units() { return (game.active === P1) ? p1_units : p2_units }
 function enemy_units() { return (game.active !== P1) ? p1_units : p2_units }
 
+function are_pieces_different_nationality(a, b) {
+	return data.pieces[a].side !== data.pieces[b].side
+}
+
 function set_piece_hex(p, hex) {
 	zoc_valid = false
 	game.pieces[p] &= 1
@@ -2038,18 +2042,29 @@ states.attack = {
 function can_attack_cavalry_support(p) {
 	if (p === game.who)
 		return false
+	// no support between prussia/aa
+	if (are_pieces_different_nationality(game.who, p))
+		return false
 	return is_adjacent(piece_hex(p), piece_hex(game.who))
 }
 
 function can_defend_cavalry_support(p) {
 	if (p === game.target)
 		return false
+	// no support between prussia/aa
+	if (are_pieces_different_nationality(game.target, p))
+		return false
 	return is_adjacent(piece_hex(p), piece_hex(game.target))
 }
 
 function can_attack_infantry_support(p) {
 	if (p === game.who)
 		return false
+	// TODO: no support between prussia/aa infantry ?
+	/*
+	if (are_pieces_different_nationality(game.who, p))
+		return false
+	*/
 	return is_adjacent(piece_hex(p), piece_hex(game.target))
 }