With the Wolves working on the power play, right wing Tim Stapleton took a pass at the top of the zone, held it and then sent it across to Postma, who wound up and hammered a shot past Peoria netminder Ben Bishop for the game-winner. Crabb finished the scoring, 4-2, with an empty net goal, his second of the night, with 20 seconds left to play.
The win marked the ninth time in the last 10 home matchups in which Chicago (30-17-0-4) has been victorious. The club thanked fans for their loyalty and hometown support by offering a complimentary ticket, good for any remaining February home game, to anyone holding a ticket for tonight's game - used or unused - because of the severe winter weather Tuesday night.
"They were tired and we had the benefit of a little rest this weekend, but I thought we controlled the game," said Wolves Head Coach Don Lever. "We're playing very well in front of our goaltenders and playing a good team game right now."
Peoria (24-21-1-5) opened scoring on the power play after a Wolves player went down injured, opening up the ice for the defenseman Jonas Junland to fire a rocket past Wolves goaltender Peter Mannino, 6:40 into the first frame.
Center Riley Holzapfel brought the Wolves even, 1-1, at 10:50 of the first period. Right wing Spencer Machacek drove into the Rivermen zone, spun around and dropped off the puck for Holzapfel, who ripped it past Bishop.
Joey Crabb wrapped around the net and deposited the puck into the corner out of Bishop's reach with 6:26 remaining in the second frame to give the Wolves a 2-1 lead.
Bishop (15-11-3) turned aside 33 shots for the Rivermen.
Peoria tied the game, 2-2, when Nicolas Drazenovic stripped a Wolves player off a puck along the boards and broke down the ice, slipped a pass to Brett Sonne, who flung a shot down the slot, past Mannino.
Mannino (15-3-0) posted 22 saves in his career-best seventh straight win, and his 11th straight start allowing two or fewer goals.
The Wolves travel to Texas this weekend for a three-game road swing, starting when they face the Texas Stars at Cedar Park Center on Friday at 7:30 p.m.
Peoria 1 1 0 -- 2
Chicago 2 0 2 -- 4
First Period---1, Peoria, Junland 11 (Stastny), 6:40 pp; 2, Chicago, Holzapfel 6 (Machacek, Doell), 10:50; 3, Chicago, Crabb 17 (Anderson), 13:34 pp. Penalties---Simpson, Chicago (interference), 5:36; Junland, Peoria (tripping), 7:59; Junland, Peoria (boarding), 12:27; Welch, Chicago (interference), 14:01; Talbot, Peoria (high-sticking), 17:58.
Second Period---4, Peoria, Sonne 6 (Drazenovic, Reaves), 2:51. Penalties---Peluso, Peoria (fighting), 2:25; Simpson, Chicago (fighting), 2:25; Stastny, Peoria (hooking), 7:58; Eller, Peoria (hooking), 10:09; Doell, Chicago (slashing), 17:13.
Third Period---5, Chicago, Postma 5 (Stapleton, Anderson), 13:01 pp.; 6, Chicago, Crabb 18 (Anderson, Chelios), 19:40 en. Penalties---Simpson, Chicago (hooking), 3:27; Bench, Peoria (too many men), 5:42; Postma, Chicago (holding), 9:33; Fletcher, Peoria (interference), 12:55.
Shots on goal---Peoria: 5-7-12--24. Chicago: 11-18-8--37. Power plays---Peoria 1-5. Chicago: 2-8. Goalies---Peoria, Bishop (33-36). Chicago, Mannino (22-24). A---4014. Referee---Ian Croft. Linesmen---Al Stensland and Aaron Mills.