From 4620136eeac88c66839bdd5aca1eb37376265c34 Mon Sep 17 00:00:00 2001
From: Tor Andersson <tor@ccxvii.net>
Date: Sun, 24 Jul 2022 13:04:38 +0200
Subject: Update RNG.

---
 rules.js | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/rules.js b/rules.js
index 61ccff5..5ac89f0 100644
--- a/rules.js
+++ b/rules.js
@@ -233,7 +233,9 @@ function abs(x) {
 
 function random(n) {
 	clear_undo()
-	return ((game.seed = game.seed * 69621 % 0x7fffffff) / 0x7fffffff) * n | 0
+	if (game.rng === 1)
+		return ((game.seed = game.seed * 69621 % 0x7fffffff) / 0x7fffffff) * n | 0
+	return (game.seed = game.seed * 200105 % 34359738337) % n
 }
 
 function roll_die(reason) {
@@ -9369,6 +9371,10 @@ exports.setup = function (seed, scenario, options) {
 		log: [],
 	})
 
+	// Old RNG for ancient replays
+	if (options.rng)
+		game.rng = options.rng
+
 	switch (scenario) {
 	default:
 		// fallthrough
-- 
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