https://blog.evanchen.cc/2026/04/01/toa/https://blog.evanchen.cc/wp-content/uploads/2026/04/toa-news-1.pngtoa-newshttps://blog.evanchen.cc/wp-content/uploads/2026/04/toa-news.pngtoa-newshttps://blog.evanchen.cc/wp-content/uploads/2026/04/toa-1.pngtoahttps://blog.evanchen.cc/wp-content/uploads/2026/04/toa.pngtoa2026-04-01T20:14:03+00:00monthlyhttps://blog.evanchen.cc/2026/03/04/amm-2026/2026-03-17T09:54:59+00:00monthlyhttps://blog.evanchen.cc/2020/12/16/usemo-problem-development-behind-the-scenes/https://blog.evanchen.cc/wp-content/uploads/2020/12/table.pngtable2026-01-31T21:05:25+00:00monthlyhttps://blog.evanchen.cc/2025/11/11/foresight/2026-01-11T01:15:51+00:00monthlyhttps://blog.evanchen.cc/2025/09/25/usemo-2025/2025-09-23T20:17:41+00:00monthlyhttps://blog.evanchen.cc/2025/09/02/most/https://blog.evanchen.cc/wp-content/uploads/2025/07/2025-06-29-kpop.png2025-06-29-kpopsome of my friends know me too well2025-09-03T23:35:06+00:00monthlyhttps://blog.evanchen.cc/2025/07/16/write-well/2025-09-06T15:40:09+00:00monthlyhttps://blog.evanchen.cc/2025/07/29/imo/2025-07-30T01:15:35+00:00monthlyhttps://blog.evanchen.cc/2025/08/08/teaching-multivar/https://blog.evanchen.cc/wp-content/uploads/2025/08/2024-09-17-under-my-protection.jpg2024-09-17-under-my-protectionhttps://blog.evanchen.cc/wp-content/uploads/2025/08/2024-09-17-normalvec.png2024-09-17-normalvec2026-03-02T23:48:34+00:00monthlyhttps://blog.evanchen.cc/2025/07/11/qr/2025-09-11T22:45:02+00:00monthlyhttps://blog.evanchen.cc/2025/06/03/otis-xi-applications-out/2025-06-02T13:52:00+00:00monthlyhttps://blog.evanchen.cc/2021/02/21/unnecessarily-detailed-stories-of-my-mystery-hunt-puzzles/https://blog.evanchen.cc/wp-content/uploads/2021/02/screenshot_2021-02-20-puzzle-pdf.pngScreenshot_2021-02-20 puzzle pdfThe cover page of the IMO Shortlist.https://blog.evanchen.cc/wp-content/uploads/2021/02/screenshot_2021-02-20-puzzle-pdf1.pngScreenshot_2021-02-20 puzzle pdf(1)Using the abbreviation "NT". It's not an accident!https://blog.evanchen.cc/wp-content/uploads/2021/02/screenshot_2021-02-20-evan-chen-e280a2-problems.pngScreenshot_2021-02-20 Evan Chen • ProblemsDefinitely not planting data on my website.https://blog.evanchen.cc/wp-content/uploads/2021/02/level5.pnglevel5The fifth level of Divided Is Us. One player in each quadrant.https://blog.evanchen.cc/wp-content/uploads/2021/02/nutrition-facts.pngnutrition-factsSVG pie chart. When you hover over in the real puzzle, the highlighted section changes and a different color is revealed.https://blog.evanchen.cc/wp-content/uploads/2021/02/screenshot_2021-02-20-clueless-e28094-mit-mystery-hunt-2021.pngScreenshot_2021-02-20 Clueless — MIT Mystery Hunt 2021The eventual presentation of the Hanabi puzzle.https://blog.evanchen.cc/wp-content/uploads/2021/02/soroban.jpgsorobanThe soroban as it appears in the puzzle.https://blog.evanchen.cc/wp-content/uploads/2021/02/screenshot_2021-02-20-le-chiffre-indechiffrable-e28094-mit-mystery-hunt-2021.pngScreenshot_2021-02-20 Le Chiffre Indéchiffrable — MIT Mystery Hunt 2021It's pretty minimalist as far as puzzle pages go.https://blog.evanchen.cc/wp-content/uploads/2021/02/screenshot_2021-02-20-solution-to-le-chiffre-indechiffrable-e28094-mit-mystery-hunt-2021.pngScreenshot_2021-02-20 Solution to Le Chiffre Indéchiffrable — MIT Mystery Hunt 2021Rigging the languages to spell out a cluephrase.https://blog.evanchen.cc/wp-content/uploads/2021/02/screenshot_2021-02-20-google-translate-sings-never-gonna-give-you-up.pngScreenshot_2021-02-20 Google Translate Sings Never Gonna Give You UpThe song is great, by the way.2025-05-13T05:22:47+00:00monthlyhttps://blog.evanchen.cc/2025/04/23/teammate-hunt-2025-author-notes/https://blog.evanchen.cc/wp-content/uploads/2025/04/desperate.pngdesperatehttps://blog.evanchen.cc/wp-content/uploads/2025/04/0.pngDerpy iPad art for Behold, a Puzzle.https://blog.evanchen.cc/wp-content/uploads/2025/04/digits.pngdigitsThe Digits puzzle.https://blog.evanchen.cc/wp-content/uploads/2025/04/tetkari.pngtetkariThe user interface for one of the levels, Tetkarihttps://blog.evanchen.cc/wp-content/uploads/2025/04/desp.webpdesphttps://blog.evanchen.cc/wp-content/uploads/2025/04/shapes.pngshapeshttps://blog.evanchen.cc/wp-content/uploads/2025/04/bwms.pngbwmshttps://blog.evanchen.cc/wp-content/uploads/2025/04/image-4.pngimagehttps://blog.evanchen.cc/wp-content/uploads/2025/04/image-3.pngimagehttps://blog.evanchen.cc/wp-content/uploads/2025/04/image-2.pngimage2025-04-30T00:37:07+00:00monthlyhttps://blog.evanchen.cc/2025/05/12/words-spent/2025-04-28T05:18:35+00:00monthlyhttps://blog.evanchen.cc/2023/11/06/an-advertisement-for-what-puzzle-hunts-are-about-and-why-theyre-cooler-than-everyday-puzzles/https://blog.evanchen.cc/wp-content/uploads/2023/11/newbie-intro-gph-evan-raging.pngnewbie-intro-gph-evan-raging2025-04-10T05:08:39+00:00monthlyhttps://blog.evanchen.cc/2025/04/01/fashion/https://blog.evanchen.cc/wp-content/uploads/2025/04/main.jpgmainhttps://blog.evanchen.cc/wp-content/uploads/2025/03/main.jpgmain2025-08-22T16:27:52+00:00monthlyhttps://blog.evanchen.cc/2024/04/01/ec%e2%81%b5-college-essay-consulting/https://blog.evanchen.cc/wp-content/uploads/2023/04/linted.pnglinted2025-04-18T19:08:53+00:00monthlyhttps://blog.evanchen.cc/2023/04/01/announcing-%e2%9b%b5is-the-successor-to-otis/https://blog.evanchen.cc/wp-content/uploads/2023/03/boatis-sm.pngBOATIS-sm2025-04-20T00:34:11+00:00monthlyhttps://blog.evanchen.cc/2025/03/14/news/2026-01-24T06:52:56+00:00monthlyhttps://blog.evanchen.cc/2025/02/14/getting-to-know-problems/2025-03-02T06:55:47+00:00monthlyhttps://blog.evanchen.cc/2023/10/03/yet-another-reason-i-dont-give-much-generic-advice/2024-12-28T19:39:11+00:00monthlyhttps://blog.evanchen.cc/2024/12/06/dec-2024-news/2024-12-06T16:18:33+00:00monthlyhttps://blog.evanchen.cc/2024/11/10/frontiermath/2024-11-13T11:11:43+00:00monthlyhttps://blog.evanchen.cc/2025/01/31/poset/2025-02-01T01:44:39+00:00monthlyhttps://blog.evanchen.cc/2024/10/31/hangul-spellcheck-for-vim/https://blog.evanchen.cc/wp-content/uploads/2024/10/ko-spellcheck-demo.pngko-spellcheck-demohttps://blog.evanchen.cc/wp-content/uploads/2024/10/ko-nfd-nfc-diff.pngko-nfd-nfc-diff2024-11-01T02:06:02+00:00monthlyhttps://blog.evanchen.cc/2024/09/05/september-newsflash/https://blog.evanchen.cc/wp-content/uploads/2024/09/image.pngimage2024-09-06T14:20:45+00:00monthlyhttps://blog.evanchen.cc/2018/03/27/i-switched-to-point-based-problem-sets/https://blog.evanchen.cc/wp-content/uploads/2018/02/otis-before-after.pngotis-before-after2024-08-01T01:05:14+00:00monthlyhttps://blog.evanchen.cc/2024/07/02/a-proof-of-poncelet-porism-with-two-circles/https://blog.evanchen.cc/wp-content/uploads/2024/06/poncelet-1.pngponcelet-12024-10-24T00:55:14+00:00monthlyhttps://blog.evanchen.cc/2024/05/06/otis-x-applications-are-open/2024-05-28T07:26:10+00:00monthlyhttps://blog.evanchen.cc/2024/08/05/imperative/2025-06-18T22:13:52+00:00monthlyhttps://blog.evanchen.cc/2024/04/05/grief/https://blog.evanchen.cc/wp-content/uploads/2024/04/mantra-fig3-1.pngmantra-fig3https://blog.evanchen.cc/wp-content/uploads/2024/04/mantra-fig1-1.pngmantra-fig1https://blog.evanchen.cc/wp-content/uploads/2024/04/mantra-fig2-1.pngmantra-fig2https://blog.evanchen.cc/wp-content/uploads/2024/04/mantra-grief.jpgmantra-grief2025-05-20T22:02:37+00:00monthlyhttps://blog.evanchen.cc/2024/02/01/rubrics/2025-02-22T06:21:03+00:00monthlyhttps://blog.evanchen.cc/2024/02/04/np-hard-advice-questions/2024-01-31T18:52:52+00:00monthlyhttps://blog.evanchen.cc/2024/01/18/january-newsflash/https://blog.evanchen.cc/wp-content/uploads/2024/01/imo2019p2alphageo.pngimo2019p2alphageohttps://blog.evanchen.cc/wp-content/uploads/2024/01/image.pngimage2024-01-18T21:19:47+00:00monthlyhttps://blog.evanchen.cc/2016/11/11/notes-on-publishing-my-textbook/2024-01-11T16:54:18+00:00monthlyhttps://blog.evanchen.cc/2024/01/05/mohs-was-a-mistake/2025-01-30T02:28:37+00:00monthlyhttps://blog.evanchen.cc/2023/12/22/otis-mock-aime-2024/2023-12-20T18:10:21+00:00monthlyhttps://blog.evanchen.cc/2023/09/19/the-depth-of-hanabi/2023-11-28T03:56:04+00:00monthlyhttps://blog.evanchen.cc/2023/11/03/things-ive-found-from-running-otis/https://blog.evanchen.cc/wp-content/uploads/2023/11/otis-web-interface.pngotis-web-interfacehttps://blog.evanchen.cc/wp-content/uploads/2024/06/abstruse-goose-exercise.pngabstruse-goose-exercise2023-11-20T01:53:43+00:00monthlyhttps://blog.evanchen.cc/2024/06/03/the-story-of-the-autocarrot/2024-07-10T08:21:35+00:00monthlyhttps://blog.evanchen.cc/2016/05/03/artin-reciprocity/https://blog.evanchen.cc/wp-content/uploads/2016/06/inclusion-diagram.pnginclusion-diagramhttps://blog.evanchen.cc/wp-content/uploads/2016/06/cyclo-map.pngcyclo-maphttps://blog.evanchen.cc/wp-content/uploads/2016/04/ramify-inf-prime.pngramify-inf-prime2023-10-16T13:01:26+00:00monthlyhttps://blog.evanchen.cc/2023/10/23/a-story-of-a-town/2023-10-28T07:25:12+00:00monthlyhttps://blog.evanchen.cc/2023/09/06/slice-of-life-of-the-otis-gm/2023-09-08T19:34:52+00:00monthlyhttps://blog.evanchen.cc/2023/08/26/twitch-solves-isl-season-3/2023-09-03T23:56:48+00:00monthlyhttps://blog.evanchen.cc/2015/05/29/zeros-and-primes/2023-08-30T22:00:19+00:00monthlyhttps://blog.evanchen.cc/2023/08/09/agency/2023-08-10T01:02:36+00:00monthlyhttps://blog.evanchen.cc/2023/08/30/things-to-tell-18-year-old-evan/2025-03-31T21:43:24+00:00monthlyhttps://blog.evanchen.cc/2015/05/25/von-mangoldt-and-zeta/2023-07-17T17:56:43+00:00monthlyhttps://blog.evanchen.cc/2024/03/14/brianchon-is-fair-game/https://blog.evanchen.cc/wp-content/uploads/2023/07/brianchon.pngbrianchon2023-07-13T19:52:13+00:00monthlyhttps://blog.evanchen.cc/2023/06/03/students-arent-pawns/2026-03-01T17:10:46+00:00monthlyhttps://blog.evanchen.cc/2023/04/30/new-handout-intro-to-proofs-for-the-morbidly-curious/2023-04-30T02:29:31+00:00monthlyhttps://blog.evanchen.cc/2023/07/03/what-i-would-add-to-the-k-12-list/2023-07-14T16:10:09+00:00monthlyhttps://blog.evanchen.cc/2021/02/18/some-puzzle-writing-thoughts-from-an-amateur/https://blog.evanchen.cc/wp-content/uploads/2021/02/1.pngHelpful Firefly, an iconic character from So You Think You Can Count?https://blog.evanchen.cc/wp-content/uploads/2021/02/screenshot_2021-02-21-codesheet-201912-pdf-codesheet-201912-pdf.pngScreenshot_2021-02-21 CodeSheet-201912 pdf - CodeSheet-201912 pdfTable of common encodings from puzzledpint.com2023-03-16T21:05:58+00:00monthlyhttps://blog.evanchen.cc/2023/02/09/japanese-egmo-is-published/https://blog.evanchen.cc/wp-content/uploads/2023/02/511z0go01l._sx334_bo1204203200_.jpg511z0go01l._sx334_bo1204203200_2025-03-21T15:06:27+00:00monthlyhttps://blog.evanchen.cc/2023/02/23/signal-boost-for-carina-initiatives-full-time-position/https://blog.evanchen.cc/wp-content/uploads/2023/02/carina-ad.pngcarina-ad2023-02-23T20:40:36+00:00monthlyhttps://blog.evanchen.cc/2023/03/11/everything-i-need-is-on-the-ground/2023-05-25T19:50:06+00:00monthlyhttps://blog.evanchen.cc/2023/02/14/but-look-at-me-now/https://blog.evanchen.cc/wp-content/uploads/2023/02/oliveira.gifoliveira2023-02-16T04:46:10+00:00monthlyhttps://blog.evanchen.cc/2023/01/23/mystery-hunt-2023/https://blog.evanchen.cc/wp-content/uploads/2023/01/tamemeat.jpgtamemeathttps://blog.evanchen.cc/wp-content/uploads/2023/01/zerodays-sm.jpgzerodays-smhttps://blog.evanchen.cc/wp-content/uploads/2023/01/zerodays.jpgzerodayshttps://blog.evanchen.cc/wp-content/uploads/2023/01/mh-ig.pngmh-ighttps://blog.evanchen.cc/wp-content/uploads/2023/01/2023-01-09-17.31.48.jpg2023-01-09 17.31.48https://blog.evanchen.cc/wp-content/uploads/2023/01/69.png692023-01-26T22:00:07+00:00monthlyhttps://blog.evanchen.cc/2014/01/15/constructing-parallelograms/2023-01-02T20:21:21+00:00monthlyhttps://blog.evanchen.cc/2023/01/02/the-silver-lining/2023-01-02T20:07:12+00:00monthlyhttps://blog.evanchen.cc/2023/01/17/a-common-type-error-on-the-otis-application/2025-01-14T07:02:49+00:00monthlyhttps://blog.evanchen.cc/2022/11/18/why-evan-does-not-like-javascript-as-a-first-language/2025-01-27T23:13:31+00:00monthlyhttps://blog.evanchen.cc/2022/11/24/two-updates-on-the-egmo-textbook/2023-10-29T05:07:52+00:00monthlyhttps://blog.evanchen.cc/2022/11/15/a-poem-i-wrote/2023-10-24T07:03:00+00:00monthlyhttps://blog.evanchen.cc/2022/11/04/twitch-solves-isl-season-2/2022-11-04T15:57:39+00:00monthlyhttps://blog.evanchen.cc/2021/06/25/mop-2021-puzzle-hunt/2022-05-03T16:41:15+00:00monthlyhttps://blog.evanchen.cc/2022/03/11/ending-season-1-of-twitch-solves-isl/2022-04-23T19:35:43+00:00monthlyhttps://blog.evanchen.cc/2021/09/21/sometimes-the-best-advice-is-no-advice/2023-03-23T20:28:00+00:00monthlyhttps://blog.evanchen.cc/2021/08/16/book-pitch/2022-07-11T06:34:23+00:00monthlyhttps://blog.evanchen.cc/2021/08/24/otis-the-rpg/https://blog.evanchen.cc/wp-content/uploads/2021/08/img_0254.pngimg_02542021-09-01T09:22:34+00:00monthlyhttps://blog.evanchen.cc/all-posts/2021-08-14T22:06:16+00:00weekly0.6https://blog.evanchen.cc/2021/08/10/i-reserved-a-steam-deck/2021-08-10T18:53:39+00:00monthlyhttps://blog.evanchen.cc/about/2021-08-09T22:23:10+00:00weekly0.6https://blog.evanchen.cc/2021/07/15/a-short-dissent-statement-on-usa-eligibility/2021-07-15T16:39:59+00:00monthlyhttps://blog.evanchen.cc/2017/01/05/facts-about-lie-groups-and-algebras/https://blog.evanchen.cc/wp-content/uploads/2017/01/exp-commute.pngexp-commutehttps://blog.evanchen.cc/wp-content/uploads/2016/03/lie-groups-exp-commute.pnglie-groups-exp-commute2021-04-11T02:54:21+00:00monthlyhttps://blog.evanchen.cc/2020/06/14/on-choosing-exercises/2021-02-14T04:38:53+00:00monthlyhttps://blog.evanchen.cc/2020/11/10/usa-special-team-selection-test-series-for-imo-2021/2020-11-16T16:07:03+00:00monthlyhttps://blog.evanchen.cc/2020/04/21/usemo-sign-ups-are-open/2020-04-21T15:29:07+00:00monthlyhttps://blog.evanchen.cc/2020/04/15/circular-optimization/2024-02-29T23:26:12+00:00monthlyhttps://blog.evanchen.cc/2020/01/13/meritocracy-is-the-worst-form-of-admissions-except-for-all-the-other-ones/2020-01-27T20:26:57+00:00monthlyhttps://blog.evanchen.cc/2018/02/28/revisiting-arc-midpoints-in-complex-numbers/https://blog.evanchen.cc/wp-content/uploads/2018/02/ohnoes.pngohnoeshttps://blog.evanchen.cc/wp-content/uploads/2018/02/xyzt.pngxyzthttps://blog.evanchen.cc/wp-content/uploads/2018/02/triangle.pngtrianglehttps://blog.evanchen.cc/wp-content/uploads/2018/02/jmo1.pngjmo1https://blog.evanchen.cc/wp-content/uploads/2018/02/abcd.pngabcd2024-04-05T21:07:45+00:00monthlyhttps://blog.evanchen.cc/2019/11/26/mohs-hardness-scale/2019-11-25T22:55:45+00:00monthlyhttps://blog.evanchen.cc/2016/12/14/sysrq-on-arch-linux-mac-mini/2019-09-06T00:18:59+00:00monthlyhttps://blog.evanchen.cc/2019/07/23/imo-2019-aftermath/https://blog.evanchen.cc/wp-content/uploads/2019/07/twn-pic.jpgtwn-picPicture with team Taiwan at the closing ceremonyhttps://blog.evanchen.cc/wp-content/uploads/2019/07/yang-pic.jpgyang-picPicture with deputy leader Yang Liuhttps://blog.evanchen.cc/wp-content/uploads/2019/07/2019-07-22_00-35-52.jpg2019-07-22_00-35-52https://blog.evanchen.cc/wp-content/uploads/2019/07/2019-07-21_19-18-42.jpg2019-07-21_19-18-42View from the Ferris wheel at the closing ceremonyhttps://blog.evanchen.cc/wp-content/uploads/2019/07/crossword-at-imo.pngcrossword-at-imoRan into this while working with team USA on a crossword after the contesthttps://blog.evanchen.cc/wp-content/uploads/2019/07/2019-07-21_11-54-30.jpg2019-07-21_11-54-30Canmoo with friend (another tradition apparently)https://blog.evanchen.cc/wp-content/uploads/2019/07/po-pic.jpgpo-picPicture with Po-Shen Loh at McDonald'shttps://blog.evanchen.cc/wp-content/uploads/2019/07/2019-07-20_23-20-51.jpg2019-07-20_23-20-51McDonald's trip, an annual tradition whenever USA wins an international contest.https://blog.evanchen.cc/wp-content/uploads/2019/07/2019-07-17_20-33-39.jpg2019-07-17_20-33-39Picture with Anant Mudgal, OTIS instructor and IMO6 authorhttps://blog.evanchen.cc/wp-content/uploads/2019/07/2019-07-17_17-39-04.jpg2019-07-17_17-39-04My room at the University of 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