From 70658f1d0dd021b7a98dc82559e073cb717c9246 Mon Sep 17 00:00:00 2001
From: Tor Andersson <tor@ccxvii.net>
Date: Mon, 26 Dec 2022 01:13:58 +0100
Subject: Forbid entering own map edge hexes.

---
 rules.js | 16 ++++++++++++++++
 1 file changed, 16 insertions(+)

diff --git a/rules.js b/rules.js
index 7e5fc7a..4e78cd5 100644
--- a/rules.js
+++ b/rules.js
@@ -1622,15 +1622,19 @@ function search_redeploy(start) {
 // Breadth First Search
 function search_path_bfs(from, cost, start, road, max_cost, retreat, sline, sdist) {
 	let path_enemy, enemy_sides
+	let exit1, exit2
 
 	if (presence_invalid)
 		update_presence()
 	if (is_axis_player()) {
 		path_enemy = presence_allied
 		enemy_sides = game.allied_sides
+		exit1 = exit2 = 175
 	} else {
 		path_enemy = presence_axis
 		enemy_sides = game.axis_sides
+		exit1 = 99
+		exit2 = 148
 	}
 
 	from.fill(0)
@@ -1655,6 +1659,10 @@ function search_path_bfs(from, cost, start, road, max_cost, retreat, sline, sdis
 			if (next < first_hex || next > last_hex || !hex_exists[next])
 				continue
 
+			// can't enter own map edge
+			if (next === exit1 || next === exit2)
+				continue
+
 			// already seen
 			if (cost[next] < 15)
 				continue
@@ -1718,6 +1726,7 @@ function search_path_bfs(from, cost, start, road, max_cost, retreat, sline, sdis
 
 function search_path_redeploy_bfs(cost, start, road) {
 	let path_enemy, friendly_network, enemy_network, enemy_sides
+	let exit1, exit2
 
 	if (presence_invalid)
 		update_presence()
@@ -1726,11 +1735,14 @@ function search_path_redeploy_bfs(cost, start, road) {
 		friendly_network = game.buildup.axis_network
 		enemy_network = game.buildup.allied_network
 		enemy_sides = game.allied_sides
+		exit1 = exit2 = 175
 	} else {
 		path_enemy = presence_axis
 		friendly_network = game.buildup.allied_network
 		enemy_network = game.buildup.axis_network
 		enemy_sides = game.axis_sides
+		exit1 = 99
+		exit2 = 148
 	}
 
 	cost.fill(63)
@@ -1754,6 +1766,10 @@ function search_path_redeploy_bfs(cost, start, road) {
 			if (next < first_hex || next > last_hex || !hex_exists[next])
 				continue
 
+			// can't enter own map edge
+			if (next === exit1 || next === exit2)
+				continue
+
 			// already seen
 			if (cost[next] < 63)
 				continue
-- 
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