diff -r 1347e4dabac0 -r 08d7a6e3ec31 src/network.h
--- a/src/network.h	Sat Mar 22 17:23:07 2014 +0100
+++ b/src/network.h	Sat Mar 22 18:56:52 2014 +0100
@@ -43,8 +43,10 @@
 #define NETCODE_MOVE 0x20
 #define NETCODE_SURRENDER 0x21
 #define NETCODE_REMIS 0x22
+#define NETCODE_CHECK 0x23
+#define NETCODE_CHECKMATE 0x24
     
-#define NETCODE_VERSION 3
+#define NETCODE_VERSION 4
 
 typedef struct {
     int fd; /* -1, if we are the client */