Blunderchess.net – blunder for your opponent every five moves

In plain words

Blunderchess.net is an open source, peer-to-peer chess application where players alternate making moves for themselves and their opponent. Every five moves, each player gets to make one "blunder-move" on behalf of their opponent, introducing an element of sabotage to the game. It is designed for players who want to add unpredictability and humor to traditional chess gameplay.

written from the facts on this page · September 2026

• CA
  ChessCoach – A neural chess engine that comments on each player's moves2021 · chrisbutner.github.io · ▲506
• 
  OffChess – Offline chess puzzles app2025 · offchess.com · ▲369

  Hi HN! I'm the developer of rdx, a mildly popular ad-free, privacy and user friendly Reddit client. This time, I made something for a very specific use case: solving chess puzzles with no internet. Why? Well, my Wi-Fi is terrible in the bathroom—and that's where I do some of my best thinking. I tried printing out “mate in X” puzzles to solve offline, but they weren’t fun without interaction. So I built OffChess. OffChess is an iPhone/Android app that contains over 100,000 chess puzzles, fully offline and completely ad-free. You can solve puzzles by category (Mate in…

• 
  My 6 Weeks Project, MultiplayerChess.com2011 · multiplayerchess.com · ▲79

  Play chess online for free on Chess.com with over 250 million members from around the world. Have fun playing with friends or challenging the computer!

• 
  Halfchess2017 · halfchess.com · ▲69

  Learn to be a better Chess player, playable in your browser

• 
  Did I Blunder2024 · didiblunder.com · ▲10

  Your Free Chess Analysis Companion

• 
  Spicy Chess2023 · spicychess.com · ▲76

  Hello! I created SpicyChess(https://spicychess.com) because I wanted a tactics training app that would have the following features: - Spaced Repetition. - Countdown time to simulate blitz Chess where you have to find the best move quickly. - The ability to save puzzles for later review. I'd love to hear any feedback that you may have !

• 
  /dev/null▲490

  a social network for devs

  Dev tools · 4d ago · dev-null.sh

• 
  Whiteboard (YC W26) – an open-source IDE for thoughtful software design▲423

  open-source IDE for thoughtful software design. Contribute to devdotfast/whiteboard development by creating an account on GitHub.

  Dev tools · 29d ago · github.com

• 
  Reladraw – A diagram language where you decide where to place things▲411

  Contribute to reladraw/reladraw development by creating an account on GitHub.

  Dev tools · 27d ago · github.com

• 
  Run full iOS 16.5 firmware on Android Devices▲366

  Contribute to oosexgang/hackios-xnu-kernel development by creating an account on GitHub.

  Dev tools · 14h ago · github.com

• 
  OpenBot▲362

  Grok Bot alternative: free, local, open-source, multiplayer

  Dev tools · 24d ago · openbot.run

• 
  Talanoa▲346

  Hi HN, I’m a fullstack developer, and honestly, I’ve lost count of how many side projects I’ve worked on over the years. But one idea kept coming back to me: a different kind of email client. It first came to me in 2014: “What if we could handle emails more like conversations?” Every year, I’d revisit this concept in my “Build Notes.” Ten years later, no one had built exactly what I had in mind — so I finally decided to do it myself. That’s how Talanoa was born. I wanted something focused on people, not timelines. I was tired of marking messages as unread just to remember to reply later, or…

  Dev tools · 21d ago · talanoa.email

• 
  Screen Studio 3.0▲1,832

  Beautiful screen recordings with instant shareable links

  Growth · 2025 · screen.studio

• 
  Tana▲1,665

  Put your notes to work with voice and AI

  AI · 2025 · tana.inc

• IG
  I got laid off from Meta and created a minor hit on Steam▲1,581

  I was at FB/Meta from late 2013 to early 2023, mostly working in the compiler/runtime spaces. I got hit in the spring 2023 layoff wave. I immediately started making games in my newfound free time (a lifelong interest, and I even worked in AA(A?) back ca. ~2000), and in October 2023 I stumbled upon the idea of a roguelike pachinko/plinko game inspired by Luck Be A Landlord. Things snowballed quickly, I started talking to publishers, then worked like crazy through all of 2024, almost the hardest I've ever worked in my career, and launched the game in December 2024. It's sold…

  Work · 2025

• 
  Tanka▲1,410

  AI Messenger with smart reply & long term memory for teams

  AI · 2025 · tanka.ai

• 
  Tool Finder▲1,327

  Your shortcut to better software

  AI · 2025 · toolfinder.com

• 
  I built an app to stop me doomscrolling by touching grass▲1,203

  i wanted to change the habit of reaching for my phone in the morning and doomscrolling away an hour so i built an app to help me. now i have to literally touch grass before accessing my most distracting apps the app is built in swiftui, uses the screen time apis provided by apple and google vision to recognise grass or not i'd love to get your thoughts on the concept.

  Life & fun · 2025 · touchgrass.now