The XY Ring: A Classic Sudoku Technique

▶ OUR NEW ARROW SUDOKU APP IS OUT ON ALL PLATFORMS! Here are the links: Steam: https://store.steampowered.com/app/16... App Store: https://apps.apple.com/us/app/arrow-s... Google Play: https://play.google.com/store/apps/de... ********************************************************************* Today's sudoku was created for a Discord speed-setting competition y Sam Cappleman-Lynes. It's called Delirium on the basis that Sam was almost in a a trance state when he made it due to lack of sleep! Please have a go at it at the link below: https://app.crackingthecryptic.com/su... Rules: Normal sudoku rules apply. SPOILER: There is some detail on the technique Simon uses in the video at the very bottom of this video description! ▶ PATREON MADNESS ◀ Jovi_al's 20-puzzle Sudoku Extravaganza is just OUT. We also are offering an incredible prize created by Anita Berge - many many thanks Anita - which is a pillow throw featuring the first puzzle in Jovi_al's set. To have a chance of the prize, send the message you get when you've completed puzzle 20 to us at [email protected] Remember that we will also be releasing a new Murder Mystery Sudoku Hunt for everybody if we reach 5000 patrons.   / crackingthecryptic   ▶ NEW CTC PODCAST - PILOT EPISODE ◀ You can listen to our new podcast at the links below. Apple Podcasts: https://podcasts.apple.com/au/podcast... Google Play: https://podcasts.google.com/feed/aHR0... Spotify: https://open.spotify.com/show/4lr4ojq... ************************************************************** ▶ OUR NEW KILLER SUDOKU APP IS OUT ON ALL PLATFORMS◀ https://apps.apple.com/us/app/killer-... https://store.steampowered.com/app/14... https://play.google.com/store/apps/de... ▶ SIMON REACTION BOARD (!) ◀ With thanks to Andrea for creating this :) https://simonreacts.avris.it/ ▶ OUR MIRACLE SUDOKU APP IS OUT ◀ Steam: https://store.steampowered.com/app/13... App Store: https://apps.apple.com/us/app/id15273... Android: https://play.google.com/store/apps/de... ▶ CTC FAN DISCORD SERVER◀   / discord   NEW: Guide To Our Discord Server: https://tinyurl.com/CTCDiscordGuide ▶ OUR BACK CATALOGUE – ALL CATEGORISED WITH LINKS!◀ https://tinyurl.com/CTCCatalogue ▶ OUR NEW THERMO SUDOKU APP IS OUT!◀ AppStore: https://apps.apple.com/us/app/thermo-... Android: https://play.google.com/store/apps/de... Steam: https://store.steampowered.com/app/13... ▶ NEW CRACKING THE CRYPTIC MERCHANDISE◀ https://teespring.com/en-GB/stores/cr... ▶ OUR CHESS SUDOKU APP IS NOW OUT!◀ AppStore: https://apps.apple.com/us/app/chess-s... Steam: https://store.steampowered.com/app/12... Android: https://play.google.com/store/apps/de... ▶TRY OUR CLASSIC SUDOKU APP◀ AppStore: https://apps.apple.com/us/app/classic... Steam: https://store.steampowered.com/app/11... Android: https://play.google.com/store/apps/de... ▶TRY OUR SANDWICH SUDOKU APP◀ AppStore: https://apps.apple.com/us/app/sandwic... Steam: https://store.steampowered.com/app/11... Android: https://play.google.com/store/apps/de... ▶SEND US PUZZLES TO SOLVE/CONTACT US◀ [email protected] ▶FOLLOW US◀ Twitter: #crypticcracking @crypticcracking Instagram (for how to solve daily clues from The Times): https://www.instagram.com/crackingthe... ▶SOFTWARE◀ Play the puzzle in the video by clicking the link under the video (above). We are building a website which will allow you to enter your own sudoku puzzles into the software and this is coming soon! ▶Logo Design◀ Melvyn Mainini ▶ABOUT US◀ Hi! We're Simon Anthony and Mark Goodliffe, two of the UK's most enthusiastic puzzle solvers. We have both represented the UK at the World Sudoku Championships and the World Puzzle Championships. Thank you for watching! Simon and Mark SPOILER: As the title of the video notes, the technique is called an XY-Ring. It shares some logic with techniques like an XY-Chain and a Continuous Nice Loop. We can cover these in other videos if there is interest.