article_snippet: There have been markers at key stages of the season: a 2-0 win over Arsenal in October, 2-1 at Liverpool the following month and their stunning performance in the 5-0 win at Swansea in January.
article_snippet: This 1-0 victory at West Ham was another.
article_snippet: They looked impenetrable, especially in the closing stages as West Ham pushed for an equaliser.
article_snippet: The doubts that crept in after a rare mistake in the 1-1 draw against Manchester City in January have been eradicated.
highlights_snippet: Here at Upton Park they looked impenetrable .
  
highlights_snippet: they work-rate is phenomenal.