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bool tblmove(tbltype &tbl, tblmoveT move)
{
    tblpos emptypos = tblgetempty(tbl);
    tblelmnt elmnt;
    switch(move)
    {
    case UP:
        if(emptypos.i == tbl.begin()) break;
        elmnt = (emptypos.i-1)->at(distance((emptypos.i)->begin(),emptypos.j));
        (emptypos.i-1)->at(distance((emptypos.i)->begin(),emptypos.j)) = EMPTYEL;
        *(emptypos.j) = elmnt;
        return true;
    case DOWN:
        if(emptypos.i+1 == tbl.end()) break;
        elmnt = (emptypos.i+1)->at(distance((emptypos.i)->begin(),emptypos.j));
        (emptypos.i+1)->at(distance((emptypos.i)->begin(),emptypos.j)) = EMPTYEL;
        *(emptypos.j) = elmnt;
        return true;
    case LEFT:
        if(emptypos.j == (emptypos.i)->begin()) break;
        elmnt = *(emptypos.j-1);
        *(emptypos.j-1) = EMPTYEL;
        *(emptypos.j) = elmnt;
        return true;
    case RIGHT:
        if(emptypos.j+1 == (emptypos.i)->end()) break;
        elmnt = *(emptypos.j+1);
        *(emptypos.j+1) = EMPTYEL;
        *(emptypos.j) = elmnt;
        return true;
    }
    return false;
}