Preserve parent variant for PGN of engine-defined game

Rather than decoding an unknown variant name, (which will result in
'normal'), we keep the currently set (parent) variant when an
engine-defined variant is currently set that matches the name in
the PGN variant tag of the loaded game.

diff --git a/pgntags.c b/pgntags.c
index 616303d..fd74df7 100644 (file)
--- a/pgntags.c
+++ b/pgntags.c
@@ -115,7 +115,8 @@ ParsePGNTag (char *tag, GameInfo *gameInfo)
     } else if (StrCaseCmp(name, "Variant") == 0) {
         /* xboard-defined extension */
        success = StrSavePtr(value, &gameInfo->variantName) != NULL;
-        gameInfo->variant = StringToVariant(value);
+        if(*value && strcmp(value, engineVariant)) // keep current engine-defined variant if it matches
+            gameInfo->variant = StringToVariant(value);
     } else if (StrCaseCmp(name, "VariantMen") == 0) {
         /* for now ignore this tag, as we have no method yet */
         /* for assigning the pieces to XBoard pictograms     */