Arsene Wenger accepts Arsenal must learn how to make the most of home advantage if they are to force themselves back into the Barclays Premier League title race after suffering a disappointing 1-0 defeat to Newcastle at Emirates Stadium.
The Gunners failed to capitalise on Chelsea's loss at Liverpool when they were beaten by Andy Carroll's header just before the break, when goalkeeper Lukasz Fabianski failed to collect a looping free-kick into the penalty area.
It was the newly-promoted Magpies' first win at Emirates Stadium, and a second home defeat already for Arsenal, who lost to West Brom before the international break.
The performance left both Gunners fans and their manager with another sense of frustration.
"Our home form is a concern because against Birmingham and West Ham they were struggling wins," said Wenger, who admitted Robin van Persie was not really ready for a return to action after coming from the bench following his long injury lay-off.
"Everybody comes here and plays very tight. When you score the first goal it is all right because teams have to come out, but as long as they can sit deep we have a problem to play through when we are not on full power."