1 files changed, 7 insertions, 1 deletions
diff --git a/rules.js b/rules.js
index f63d66e..e186641 100644
--- a/rules.js
+++ b/rules.js
@@ -49,7 +49,9 @@ const RESERVE_MARK = ""
 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 logbr() {
@@ -2564,6 +2566,10 @@ exports.setup = function (seed, scenario, options) {
 		reserves: [],
 	}
 
+	// Old RNG for ancient replays
+	if (options.rng)
+		game.rng = options.rng
+
 	if (options.tournament) {
 		log("Tournament rule:\nCaesar is the first player on the very first turn of the game.")
 		game.tournament = 1