24 December 2020

• 20:5520:55, 24 December 2020 diff hist +91 m 2016 AMC 12B Problems/Problem 24 →Solution current

11 June 2020

• 00:2000:20, 11 June 2020 diff hist +59 2020 AIME II Problems/Problem 3 →Video Solution 2
• 00:1800:18, 11 June 2020 diff hist +2 2020 AIME II Problems/Problem 2 →Video Solution
• 00:1700:17, 11 June 2020 diff hist +56 2020 AIME II Problems/Problem 2 →Video Solution

10 June 2020

• 22:3322:33, 10 June 2020 diff hist +60 2020 AIME II Problems/Problem 1 →Video Solution
• 22:3222:32, 10 June 2020 diff hist −59 2020 AIME II Problems/Problem 1 →Video Solution 2
• 22:3222:32, 10 June 2020 diff hist +60 2020 AIME II Problems/Problem 1 →Solution 2 (Official MAA)

9 June 2020

• 16:3816:38, 9 June 2020 diff hist +5 Combinatorial identity →Vandermonde's Identity
• 13:5313:53, 9 June 2020 diff hist +6 Combinatorial identity →Vandermonde's Identity
• 13:5213:52, 9 June 2020 diff hist 0 Combinatorial identity →Vandermonde's Identity
• 13:3713:37, 9 June 2020 diff hist +119 2020 AIME I Problems/Problem 7 →Solution 4
• 13:2913:29, 9 June 2020 diff hist +73 2020 AIME I Problems/Problem 8 →Solution 3 (Solution 1 faster)

5 June 2020

• 00:0700:07, 5 June 2020 diff hist +61 Combinatorial identity →Vandermonde's Identity

28 May 2020

• 18:3618:36, 28 May 2020 diff hist −15 2020 AIME I Problems/Problem 7 →Solution 2 (Bash)

27 May 2020

• 22:3422:34, 27 May 2020 diff hist +138 2020 AIME I Problems/Problem 7 →Solution 2 (Bash)
• 22:3322:33, 27 May 2020 diff hist −72 2020 AIME I Problems/Problem 7 →Solution 3 (Vandermonde's identity)
• 22:3222:32, 27 May 2020 diff hist +9 2020 AIME I Problems/Problem 7 →Solution 3 (Vandermonde's identity)
• 22:3122:31, 27 May 2020 diff hist +63 2020 AIME I Problems/Problem 7 →Solution 3 (Vandermonde's identity)

20 May 2020

• 00:0600:06, 20 May 2020 diff hist +63 2020 AIME I Problems/Problem 6 →Solution

18 May 2020

• 21:0721:07, 18 May 2020 diff hist −17 2020 AIME I Problems/Problem 5 →Solution 1
• 21:0421:04, 18 May 2020 diff hist +80 2020 AIME I Problems/Problem 5 →Solution 1

4 May 2020

• 17:0017:00, 4 May 2020 diff hist +48 2020 AIME I Problems/Problem 4 →Solution

20 April 2020

• 15:0115:01, 20 April 2020 diff hist +48 2020 AIME I Problems/Problem 3 →Solution
• 10:3710:37, 20 April 2020 diff hist +56 2020 AIME I Problems/Problem 2 →Solution
• 10:3510:35, 20 April 2020 diff hist −22 2020 AIME I Problems/Problem 1 →Solution 1
• 10:3110:31, 20 April 2020 diff hist +83 2020 AIME I Problems/Problem 1 →Solution 1

17 April 2017

• 23:0223:02, 17 April 2017 diff hist +39 1991 AJHSME Problems/Problem 20 →Solution