"They had four guys back, they chipped the puck and played really simple, and I didn't think we had the legs really to give the kind of push we can and create the havoc we can," said captain Daniel Alfredsson, whose next goal will be the 400th of his career. "We did create some chances but not enough to make up for the goals we gave up,"
Alfredsson had an assist Tuesday to give him 10 points over his last six games, though he has only one goal and one assist in his last eight games versus Calgary.
Craig Anderson allowed four goals on seven shots and was pulled a little over two minutes into the second period against Montreal, dropping to 3-4-1 with a 3.37 goals-against average in his last eight starts.
Coach Paul MacLean said he won't decide until the Friday morning skate if Anderson or Alex Auld will start in net, but Anderson made 38 saves in the November victory over the Flames after he had gone 0-3-0 with a 3.58 GAA in his previous four starts against them.
Miikka Kiprusoff made 31 saves in Calgary's loss on Thursday, marking his first defeat in four starts.
He made 29 saves in the first meeting against the Senators. Despite the loss, he's 7-2-0 with a 2.29 GAA in his career versus Ottawa.
Sutter, though, said he will go with Leland Irving on Friday, giving the rookie his third career start. Irving, who is 1-0-1 with a 1.44 GAA, earned his first NHL victory by making 29 saves in a 3-1 victory over Vancouver on Dec. 23.
Flames captain Jarome Iginla is two goals shy of 500 for his career, though he hasn't scored in his last five games against Ottawa.
AccuScore has powered more than 10,000 simulations for every NHL game on ESPN.com, calculating how each team's performance changes in response to game conditions and opponent's abilities. Each game is simulated and the game is replayed a minimum of 10,000 times to generate forecasted winning percentages.