Two strikes from Rehan Butt and one apiece from Mohammed Nadeem and Shabbir Hussain were enough to secure victory for the Pakistanis against the Korean 2002 Asian Games gold medallists.

But Oltmans was far from satisfied after a porous display from the Pakistan defence.

"It was a good win but I am not too happy with our performance especially the defence," Oltmans said. "There were just too many mistakes made by the defenders and this is something we can ill afford if we want to do well."

Missed chances proved the difference between the two sides, with Pakistan deadly in front of goal as South Korea squandered a string of opportunities.

Korea went on the offensive from the first whistle but were unable to turn their domination into goals.

The Pakistanis absorbed the early pressure and relied on counter attacks and the tactic bore fruit as they took the lead in the 14th minute through Butt whose hit slipped under the leg of South Korean goalkeeper Ko Dong-Sik.

Pakistan should have doubled their advantage in the 26th minute when Shakeel Abbasi broke through the middle only to lift his shot above Ko and the bar.

The Koreans however equalized through Seo Jong-Ho a minute before the break.

Pakistan opted to attack when play resumed in the second and were duly rewarded through goals from Nadeem (39th minute) and Butt (42nd minute) to take a 3-1 lead.

However Korea reduced the deficit through Lee Jung-Seon who converted a penalty corner in the 43rd minute.

Try as they did the Koreans just could not get the better of Ahmad Alam in the Pakistan goal and while they were too engrossed in searching for the equalizer, the Koreans left gaps in their defence.

And Shabbir made the most of some good work by Butt on the right flank to score the fourth goal two minutes before the end of the match.