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Remove the check for disconnected pieces; it's over-general and
triggers on a perfectly connected piece shaped like an inverted T.

[originally from svn r7570]

--- a/unfinished/slide.c

+++ b/unfinished/slide.c

@@ -896,7 +896,7 @@

     int w = params->w, h = params->h, wh = w*h;

     int *active, *link;

     int mains = 0, mpos = -1;

-    int i, j, tx, ty, minmoves;

+    int i, tx, ty, minmoves;

     char *ret;

     active = snewn(wh, int);

@@ -941,13 +941,6 @@

 	    }

 	    link[i] = i - dist;

-	    for (j = i; j > 0; j = link[j])

-		if (j == i-1 || j == i-w)

-		    break;

-	    if (j < 0) {

-		ret = "Disconnected piece in game description";

-		goto done;

-	    }

 	    active[i] = TRUE;

 	    active[link[i]] = FALSE;