I've been to 26 Blackhawks playoff games since 2009. The most memorable was Game 5 of the 2010 Stanley Cup Final. It was the first time I was able to attend a Stanley Cup Final game, and that alone made it the most special, especially since we haven't clinched a Cup title at home in my lifetime.
Honorable mentions:
Clinchers I have been to:
1. Game 5 vs. LA Kings, 2013 Western Conference Final - Kane wins it in 2 OT
2. Game 5 vs. Minnesota Wild, 2013 First Round
3. Game 6 vs. St. Louis Blues, 2014 First Round - Hawks scored 4 goals in the 3rd to salt it away
4. Game 6 vs. Nashville Predators, 2015 First Round - Keith wins it with under 4 minutes remaining
Other notables:
1. My first playoff game ever, Game 1 vs. Calgary, 2009 First Round - It was our first playoff game in 7 years, and the arena was rocking since before the Hawks hit the ice for pregame warmups! Martin Havlat won it for us 12 seconds into OT!
2. Game 5 vs. Nashville Predators, 2010 First Round - Kane scored a shortie in the closing moments to tie it up, Hossa comes out of the box in OT to win it (I actually called it before OT started).
3. Game 3 vs. San Jose Sharks, 2010 Western Conference Final - Dustin Byfuglien wins it midway into the 1st OT. I came home crying, because I knew my Blackhawks were 1 win away from playing for their first Stanley Cup in my adult life.
4. Game 5 vs. Boston Bruins, 2013 Stanley Cup Final - I snagged a single on Ticketmaster the night before
I am going to the game tomorrow night and hope that I get another memorable game to add to this list!