Don't preserve setup position on board-size change

Normally the setup command sent by an engine is ignored if the user
already has set up a position, to not render it impossible to do the
latter. But if the setup command orders a different board size nothing
the user has set up can possibly remain valid.

diff --git a/backend.c b/backend.c
index bedeead..329901e 100644 (file)
--- a/backend.c
+++ b/backend.c
@@ -8877,7 +8877,6 @@ FakeBookMove: // [HGM] book: we jump here to simulate machine moves after book h
         s = 8 + strlen(buf), buf[s-9] = NULLCHAR, SetCharTable(pieceToChar, buf);
         ASSIGN(appData.pieceToCharTable, buf);
       }
-      if(startedFromSetupPosition) return;
       dummy = sscanf(message+s, "%dx%d+%d_%s", &w, &h, &hand, varName);
       if(dummy >= 3) {
         while(message[s] && message[s++] != ' ');
@@ -8887,8 +8886,10 @@ FakeBookMove: // [HGM] book: we jump here to simulate machine moves after book h
            if(dummy == 4) gameInfo.variant = StringToVariant(varName);     // parent variant
           InitPosition(1); // calls InitDrawingSizes to let new parameters take effect
           if(*buf) SetCharTable(pieceToChar, buf); // do again, for it was spoiled by InitPosition
+          startedFromSetupPosition = FALSE;
         }
       }
+      if(startedFromSetupPosition) return;
       ParseFEN(boards[0], &dummy, message+s, FALSE);
       DrawPosition(TRUE, boards[0]);
       startedFromSetupPosition = TRUE;