Chapman came to Arsenal promising to make them the "Newcastle of the South". Chapman and Buchan's arrival at the club also coincided with a change in the laws of the game in June 1925, that modified the offside law. The change had reduced the number of opposition players that an attacker needed between himself and the goal-line from three to two (including the goalkeeper). Buchan's idea, implemented by Chapman, was to move the centre half from a roaming position in midfield to a "stopper" position in defence. With the inside forwards brought back to help the midfield, this changed the usual formation from 2–3–5 to 3–4–3, or a "WM", so called after the shape it formed spelled out the letters. This meant the offside trap was now the responsibility of the single centre half, while the full backs were pushed wider to cover the wings.