19 April 2016

• 18:1918:19, 19 April 2016 diff hist 0 2013 USAJMO Problems/Problem 1 →Solution 3

1 January 2016

• 16:0416:04, 1 January 2016 diff hist 0 2012 AIME II Problems/Problem 15 →Solution 1

29 December 2015

• 18:3418:34, 29 December 2015 diff hist 0 1991 AIME Problems →Problem 11

22 December 2015

• 20:5120:51, 22 December 2015 diff hist +1 m 1996 AIME Problems/Problem 15 →Solution 1 (trignometry)
• 20:5120:51, 22 December 2015 diff hist +1 m 1996 AIME Problems/Problem 15 →Solution 2 (trignometry)

26 August 2015

• 09:4509:45, 26 August 2015 diff hist 0 m 2006 AIME II Problems/Problem 9 →Solution current

17 August 2015

• 15:4315:43, 17 August 2015 diff hist +1 m 2011 AIME I Problems/Problem 2 →Solution 2

26 June 2015

• 14:0614:06, 26 June 2015 diff hist 0 m 2015 AMC 12A Problems/Problem 21 →Solution