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Winger Willie Talau scored two tries for holders St Helens
Holders St Helens resisted a brave effort from Warrington to win an enthralling Challenge Cup tie.
Adrian Morley and Chris Hicks crossed for the Wolves while Willie Talau, Chris Flannery and Francis Meli scored for Saints to lead 18-14 at the break.
Hicks levelled for Warrington and Ade Gardner put Saints back in front before Kevin Penny's superb long-range score.
Talau, Paul Clough and Lee Gilmour tries put Saints 40-24 ahead before Ben Westwood and Simon Grix struck late on.
It was a thrilling cup tie in which the lead exchanged hands on seven occasions as both teams competed for a place in the quarter-finals.
Reaction: St Helens 40-34 Warrington
Had Warrington showed a little more composure at crucial moments they may well have won the game but Saints showed why they are a champion team, pulling away with three unanswered tries when the game was in the balance.
It was so different early on, with Warrington props Morley and Paul Rauhihi laying a superb platform for the visiting team with some aggressive runs down the middle.
And it was no surprise when Morley barged over the line after running onto a pass from Michael Monaghan.
Hicks added the extras and extended the Wolves' advantage with a penalty after Jon Wilkin was penalised for interference.
However, the first time St Helens enjoyed good field position they scored, working the ball from right to left with Talau easily eluding a poor attempt at a tackle from Lee Briers.
And Saints again confused the Warrington defence with their superb use of dummy runners shortly afterwards for Flannery to score.
Long had converted both tries but Warrington went ahead again when Hicks collected Paul Johnson's brilliant pass out the back of his hand to cross in the corner.
Saints, though, ensured they led at the break when Meli crossed in the corner, though there was a suspicion of a forward pass from Wellens.
Another amazing pass from Johnson saw Hicks cross in the corner to level the scores and the game continued to see-saw, with Gardner collected a rangy pass from Leon Price to cross in the corner.
The Saints try came after Warrington conceded a needless penalty and the Wolves were under pressure again before Penny's sensational try.
Monaghan caught the ball close to his own goal line and passed to Hicks, who made 30 yards before passing for Penny to side step Long and burst down the touchline.
Hicks converted from out wide to edge the Wolves ahead once again but the visiting team lost Johnson to injury shortly afterwards and before they had time to reorganise Talau had collected Pryce's short pass and crossed.
Fatigue was starting to affect both teams but the next decisive score went to the holders, thanks to a terrible error from Penny.
The winger tried an ambitious offload after collecting a kick from Pryce but lost the ball and Clough scored.
Shortly after Gilmour weaved his way through broken play and Warrington's brave challenge was over.
But, in keeping with such a entertaining tie, the Wolves scored late tries through Westwood and Grix to ensure Saints finished the match desperately defending their increasingly slender lead.
St Helens coach Daniel Anderson: "It was a great game for the crowd but not for the coaches.
"Warrington are a very dangerous side and we are thankful to get to the fifth round of the competition.
"There were some awfully attractive tries in the game but I do not want another game like that when we play in the fifth round."
Warrington coach Paul Cullen: "We have played our part in what was an absolute rugby league classic. We have got to offer the headlines to the quality of the play.
"The players have given everything. It was a massive effort.
"Saints just have that fraction of an edge when it came to their big game winning mentality."
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