1 files changed, 9 insertions, 1 deletions

diff --git a/rules.js b/rules.js
index 494c418..c0a9055 100644
--- a/rules.js
+++ b/rules.js
@@ -86,7 +86,9 @@ let states = {};
 let game = null;
 
 function random(n) {
-	return Math.floor(((game.seed = game.seed * 48271 % 0x7fffffff) / 0x7fffffff) * n);
+	if (game.rng === 1)
+		return Math.floor(((game.seed = game.seed * 48271 % 0x7fffffff) / 0x7fffffff) * n)
+	return (game.seed = game.seed * 200105 % 34359738337) % n
 }
 
 function log(s) {
@@ -3745,11 +3747,17 @@ exports.setup = function (seed, scenario, options) {
 		who: null,
 		where: null,
 	}
+
+	// Old RNG for ancient replays
+	if (options.rng)
+		game.rng = options.rng
+
 	if (options && options.iron_bridge) {
 		game.iron_bridge = 1;
 		log("Iron Bridge:\nThe road between Antioch and Harim has a move limit of 3.");
 		log("");
 	}
+
 	setup_game();
 	return game;
 }