Martin B. Justesen saychess

I felt it was time for a new experiment. Introducing CHESSVIBES WEEKLY, a new podcast that covers the latest chess news. Hope you like it! (And hopefully soon on Apple and Spotify as well.) A retweet would be appreciated... Spread the word!

www.buzzsprout.com/2546567/epis...

13.10.2025 19:28 — 👍 7 🔁 3 💬 0 📌 2

23 rapid games 😳

24.09.2025 19:45 — 👍 1 🔁 0 💬 0 📌 0

9 years ago today 💂

14.09.2025 20:33 — 👍 1 🔁 0 💬 0 📌 0

Impressive!

14.09.2025 12:15 — 👍 0 🔁 0 💬 0 📌 0

Nice! How old is your opponent though? 😯

14.09.2025 11:27 — 👍 0 🔁 0 💬 1 📌 0

My knowledge is not up to date 😄

14.09.2025 11:16 — 👍 0 🔁 0 💬 1 📌 0

🤔

14.09.2025 10:47 — 👍 3 🔁 0 💬 1 📌 0

saychess.substack.com/p/part-ii-of...

13.02.2025 21:07 — 👍 3 🔁 0 💬 0 📌 0

Made a real breakthrough in my efforts to cluster checkmate patterns 🙌🏻

12.02.2025 14:46 — 👍 8 🔁 0 💬 0 📌 1

Just an idea for FIDE, since they own the world and chess..

10.02.2025 14:28 — 👍 2 🔁 0 💬 1 📌 0

There would only be the void if not for FIDE

10.02.2025 08:05 — 👍 4 🔁 0 💬 1 📌 0

What do you mean about stalemates? I have only looked at checkmate positions from the puzzle database, so these are not in the data

08.02.2025 13:29 — 👍 0 🔁 0 💬 1 📌 0

Thanks! Yes, the corner is a 2x2 if you remove the out of board area. I think some patterns are mirror images of each other, but not completely sure yet, so have to investigate it

08.02.2025 13:24 — 👍 0 🔁 0 💬 0 📌 0

Ah yes, makes sense to avoid a pawn and a bishop to equal a knight etc.! Will make this improvement, thanks 🙏🏻

08.02.2025 08:41 — 👍 1 🔁 0 💬 0 📌 0

Mapping Checkmate Patterns with a 27-Dimensional Fingerprint Some days ago, I read in a blog post on Lichess that the kill box checkmate pattern had been added as a puzzle keyword.

Playing 27D-chess 🫨

open.substack.com/pub/saychess...

08.02.2025 07:22 — 👍 2 🔁 0 💬 2 📌 0

Both currently

30.01.2025 17:51 — 👍 0 🔁 0 💬 0 📌 0

That’s what I’m missing then 😄

30.01.2025 14:12 — 👍 1 🔁 0 💬 1 📌 0

What is your secret 👀

30.01.2025 14:07 — 👍 0 🔁 0 💬 1 📌 0

Nice!

29.01.2025 21:53 — 👍 2 🔁 0 💬 0 📌 0

YouTube video by Sports Facts 3 DAYS of Tennis Madness! The Longest Match Ever! 🎾⏳#shorts #tennis

youtube.com/shorts/3_pQQ...

They walked away as legends..

27.01.2025 11:32 — 👍 1 🔁 0 💬 0 📌 0

It now runs using this db instead of stockfish, which is quite an improvement

26.01.2025 07:51 — 👍 3 🔁 0 💬 0 📌 0

Will try to implement this, thanks!

26.01.2025 07:12 — 👍 0 🔁 0 💬 1 📌 0

Looks interesting! Then I could save a lot of engine time

25.01.2025 23:16 — 👍 0 🔁 0 💬 1 📌 0

And how would you define repertoire coverage?

25.01.2025 16:59 — 👍 0 🔁 0 💬 1 📌 0

Sure! I have used python and created the code using Replit.com

I used the lichess api to connect to the opening database and retrieve stats. It takes about 2-3 hours to generate 20 lines due to analysing 1 position leads to retrieval of data and getting evals on all the moves played more than 5%

25.01.2025 16:58 — 👍 1 🔁 0 💬 2 📌 0

Building a Data-Driven Chess Opening Repertoire + FREE TEST REPERTOIRE AGAINST 1. e4 Today, we'll explore a new approach that combines database statistics and engine evaluation to build an opening repertoire.

Worked on a new way to make opening files based on Lichess data

open.substack.com/pub/saychess...

25.01.2025 15:25 — 👍 14 🔁 1 💬 1 📌 0

100 positions you need to avoid

20.01.2025 21:14 — 👍 2 🔁 0 💬 0 📌 0

Premoved and lost my Queen in 3+0… won anyway 😆

20.01.2025 19:22 — 👍 6 🔁 0 💬 1 📌 0

Nice! Good luck :)

12.01.2025 08:20 — 👍 2 🔁 0 💬 0 📌 0

You are a serious adult improver when you have a team of coaches spearheaded by a head coach 😅

12.01.2025 08:13 — 👍 1 🔁 0 💬 0 📌 0

Posts by Martin B. Justesen (@saychess.bsky.social)