White to move. Can we create a weak square? Yes!1.d4...[%calGd2f3] Note that on top of creating a weak square, White also fixes the weakpawn on e6.1.Nb3allows Black to playe5No more weak square and weakpawn opportunities!1....Re82.Nf3Preventing any kind of e5 moves andfixing the weakness.2.Re1is doable as well.