From b9818d52e4723ae62c85429719399722bd0903c5 Mon Sep 17 00:00:00 2001
From: Antonio Martinez <aj@worldsbe.st>
Date: Sun, 25 May 2025 01:57:02 -0400
Subject: [PATCH] Duel sprint lockout, duel overtime darken

---
 src/g_game.c |  6 ++++++
 src/k_kart.c | 11 +++++++++++
 2 files changed, 17 insertions(+)

diff --git a/src/g_game.c b/src/g_game.c
index 24e4bd663..779bf2024 100644
--- a/src/g_game.c
+++ b/src/g_game.c
@@ -3870,6 +3870,12 @@ tryAgain:
 			continue;
 		}
 
+		if (numPlayers == 2 && gametype == GT_RACE && ((mapheaderinfo[i]->levelflags & LF_SECTIONRACE) == LF_SECTIONRACE))
+		{
+			// Duel doesn't support sprints.
+			continue;
+		}
+
 		// Only care about restrictions if the host is a listen server.
 		if (!dedicated)
 		{
diff --git a/src/k_kart.c b/src/k_kart.c
index 9177d36c4..b7188dd94 100644
--- a/src/k_kart.c
+++ b/src/k_kart.c
@@ -4288,9 +4288,20 @@ void K_CheckpointCrossAward(player_t *player)
 		{
 			overtimecheckpoints++;
 			if (overtimecheckpoints > 1)
+			{
 				K_AddMessage(va("Margin Boost x%d!", overtimecheckpoints), true, false);
+			}
 			else
+			{
 				K_AddMessage("Margin Boost!", true, false);
+				g_darkness.start = leveltime;
+				g_darkness.end = INT32_MAX;
+				for (UINT8 i = 0; i < MAXSPLITSCREENPLAYERS; i++)
+				{
+					g_darkness.value[i] = FRACUNIT;
+				}
+			}
+
 			S_StartSound(NULL, sfx_gsha6);
 		}