WOLVES head coach Paul Cullen said intense study of the match video will be required to work out why his players were penalised so heavily by referee Ashley Klein from the 30th minute of Sunday's 29-28 win at Hull Kingston Rovers.

His troops were winning 28-0 until the game changed on the back of Rovers being handed seven successive penalties from the 32nd minute to the 47th minute, punishing the energy levels of his players and paying the penalty as Hull KR fought back in the final quarter.

Cullen said: "At 28 minutes it was 28-0. It was an outstanding effort and outstanding contribution from all concerned.

"When we're playing fast we're looking good offensively and defensively, and when we're not we're not.

"Five or six back-to-back penalties in the last 10 minutes of the first half literally pulled the plug.

"We spent 10 minutes defending our try line.

"A game that we completely dominated for the first 30 minutes went from the sublime to the ridiculous.

"We virtually never touched the ball for 10 minutes between the 30th and 40th minutes and the penalties we conceded were quite incredible.

"While we're looking round to wonder why we've been penalised, we had six back-to-back penalties against us.

"We're going to need to study the video tape intensely to find out why the penalties were conceded and what the referee blew for.

"We went out in the second half looking to repeat what we did in the first 30 minutes of the first half but penalties kicked in again.

"We put a couple of balls on the floor, we spent the next 10 to 15 minutes conceding penaltiies and defending our try line.

"We won't need to do much tackle practice this week because we did it in the final 50 minutes of Sunday's game.

"When conceding 10 penalties between the last 10 minutes of the first half and the first 20 minutes of the second half, the game changed entirely on the back of it.

"I thought there were some patches where we were absolutely outstanding, and movement of the ball was superb, while the collision win, the offload and the speed of the play-the-ball was of a very high standard.

"Then, all of a sudden, we were doing 10 to 15 minutes without any ball, penalty after penalty, and you become to look very ordinary.

"They then got us right up the middle on four or five occasions."