Birmingham Brummies moved clear at the top of the Elite League table after thrashing local rivals Wolverhampton Wolves 57-33 at Perry Barr Stadium.
The meeting had promised to be a closely-fought derby with the two sides tied on points at the league summit, but the Brummies dominated from start to finish.
Ben Barker and Martin Smolinski won three heats each, the former combining with Danny King to record three separate 1-2 finishes.
The Wolves still have three fixtures in hand and look certain to make the play-offs, but that proved to be no consolation for team manager Peter Adams.
"You can't take anything away from (Birmingham), they've been absolutely excellent," Adams told Sky Sports.
"It's never easy when you've come up with the worst performance of the season in the most important fixture. Sometimes you have to take the rough with the smooth and tonight isn't very smooth."
He added: "I just think Birmingham have been better in every single department. They've been faster from the start, cleverer during the first corner, faster during the race.
"They were absolutely excellent from start to finish and, with one or two exceptions, we were rubbish."
The Brummies made their first move in the second heat as guest rider Nicolai Klindt led home a 5-1 points haul, with Barker and King repeating that in the next heat.
The visitors were already 10 points down and quickly nominated Freddie Lindgren for double points, but the plan backfired as Barker again led home King to make the score 22-8.
Another 5-1 by Barker and King, with the latter this time taking the win, followed in heat nine with Tai Woffinden coming home third as the double-points ride proved fruitless for the Wolves again.
The hosts continued to extend their lead until Britain's world title contender Woffinden led home team-mate Lindgren for a 5-1 to Wolverhampton in heat 13. Woffinden and Lindgren repeated that result in the final heat but it was far too little, too late.
Elsewhere in the Elite League on Wednesday, King's Lynn Stars defeated Belle Vue Aces 52-38 in Norfolk to bolster their play-off hopes.