wenger and mourinho faced off once more as arsenal and chelsea contested a 0-0 draw .
neither boss was in a combative mood before the game despite some fiery match-ups between the pair in the past .
arsenal manager yet to record a win against the portuguese in 13 meetings .
the point is another significant step for chelsea in their inevitable march toward the title .
mourinho hits out at ` boring ' criticism as he claims 11-year title wait for arsenal is the real tragedy .