25 February 2018

• 17:1217:12, 25 February 2018 diff hist 0 m 2018 AMC 12B Problems/Problem 21 →Solution 2

2 February 2018

• 23:2323:23, 2 February 2018 diff hist −4 m 2007 AIME I Problems/Problem 14 →Solution 4 (pure algebra)

10 July 2017

• 21:4921:49, 10 July 2017 diff hist +758 2001 AMC 12 Problems/Problem 21 →Solution

16 February 2017

• 13:0313:03, 16 February 2017 diff hist −1 m 2017 AMC 10B Problems/Problem 23 →Solution
• 13:0213:02, 16 February 2017 diff hist +18 2017 AMC 10B Problems/Problem 23 →Solution

6 July 2016

• 12:0612:06, 6 July 2016 diff hist +12 m 2016 AIME II Problems/Problem 6 →Solution 2
• 12:0512:05, 6 July 2016 diff hist +17 2016 AIME II Problems/Problem 6 →Solution 2
• 12:0412:04, 6 July 2016 diff hist +726 2016 AIME II Problems/Problem 6 →Solution