The Hockey World League (HWL) Semifinals in the Belgian city of Antwerp, hosting its first major international hockey tournament since the 1920 Olympics, offers direct entry to the 2016 Olympics for three teams each in the men and women's competitions.
The Indian men's team is the only one in this tournament, which includes reigning World Champions Australia besides former Olympic champions Pakistan and Great Britain, to have already secured its passage to Rio by virtue of winning the gold medal at the Incheon Asian Games last year.
Van Ass acknowledged that India is now able to match the pace set by the rivals, but his wards need to bolster their ability of setting the pace to suit their game plan.
"When fit enough, the Indian players are quite good when the rivals make the pace of the contest, but they need to learn to dictate the flow of the contest," said Van Ass, who took charge of the Indian team two months ago ahead of the Azlan Shah Cup in Malaysia, where the team won the bronze medal.
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"Defending as a group is important. It is a structure story about getting the angles right."
India's qualification for the Olympic Games has provided Van Ass, a former Dutch national coach, some time to implement his strategy and assess the abilities of the players available to him, although a few injuries during the training camp ahead of the Belgian sojourn has been a disappointment.
Three late changes were made to the Indian squad for the World League Semifinals.