--- a/src/network.h	Thu May 28 13:58:24 2026 +0200
+++ b/src/network.h	Sun Jun 07 14:55:20 2026 +0200
@@ -45,6 +45,7 @@
 #define NETCODE_CHECK 0x22
 #define NETCODE_CHECKMATE 0x24
 #define NETCODE_STALEMATE 0x28
+#define NETCODE_THREEFOLD 0x30
 #define NETCODE_RESIGN 0x41
 #define NETCODE_REMIS 0x42
 #define NETCODE_TAUNT 0x43
@@ -53,7 +54,7 @@
 #define NETCODE_CONNLOST 0x80
 #define NETCODE_ERROR 0xFF
 
-#define NETCODE_VERSION 19
+#define NETCODE_VERSION 20
 
 typedef struct {
     int fd; /* -1, if we are the client */