Hartlepool manager Mick Wadsworth felt his system changes reaped dividends after seeing his side upset leaders Brighton in a 3-1 home win.
Goals from Neil Austin, Gary Liddle and James Poole infliced only a second league defeat of the season on Brighton, who had earlier equalised through Gary Dicker before Seagulls' midfielder Liam Bridcutt was sent off for a professional foul in the 77th minute.
Wadsworth said: "It was a real blood-and-thunder game when it got going. They started quite slowly, but picked up certainly in the second half.
"We thought the gameplan through. Against the best sometimes you have to sacrifice something for a while. We set up differently and it gave us a foothold in the game.
"The big word we used before was concentration - making good decisions. They move the ball about and move their men about well.
"It's about our men making the right decision. The most important thing was we defended generally well and played good football. I think the changes we made were important. They changed and went to 4-3-3 which meant we had to get out and make a foothold and we went back to 4-3-3 that worked well."