Don't switch to engine-defined variant on game loading

When loading a game from PGN the variant tag will have been decoded as
'normal' in case of an engine-defined variant, and we certainly would
not want to switch to that. Better stay in the variant the user had
selected before, and hope for the best.

diff --git a/backend.c b/backend.c
index fe70fd2..eb9059f 100644 (file)
--- a/backend.c
+++ b/backend.c
@@ -12857,7 +12857,7 @@ LoadGame (FILE *f, int gameNumber, char *title, int useList)
        if (!err) numPGNTags++;
 
         /* [HGM] PGNvariant: automatically switch to variant given in PGN tag */
-        if(gameInfo.variant != oldVariant) {
+        if(gameInfo.variant != oldVariant && (gameInfo.variant != VariantNormal || gameInfo.variantName == NULL || *gameInfo.variantName == NULLCHAR)) {
             startedFromPositionFile = FALSE; /* [HGM] loadPos: variant switch likely makes position invalid */
            ResetFrontEnd(); // [HGM] might need other bitmaps. Cannot use Reset() because it clears gameInfo :-(
            InitPosition(TRUE);