Say Chess

Vibe Training a Chess Puzzle Model Like Deepmind

Supervised Pre-Training

Nov 8 • 

Martin B. Justesen

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October 2025

Building a Systematic Checkmate Pattern Book

Hi!

Oct 29 • 

Martin B. Justesen

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5

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August 2025

I Slept My Way to 2100 in Blitz on Chess.com

It seems fitting to reemerge and give an update on my chess journey now that I have something positive to share.

Aug 6 • 

Martin B. Justesen

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March 2025

February 2025

Newsletter Update: Slow(er) Productivity

In the last 4 years, I have written +300 newsletters and published 19 chess books. It has been a very intense and productive period, but it is also…

Feb 22 • 

Martin B. Justesen

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3

Part II of Mapping Checkmate Patterns with a 27-Dimensional Fingerprint

Last week I posted a try to find and organize checkmate patterns using a clustering algorithm combined with a focused look on the 3x3 squares around the…

Feb 13 • 

Martin B. Justesen

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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.

Feb 7 • 

Martin B. Justesen

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January 2025

The Tactics Ladder is Now Free

I’ve decided to make TacticsLadder.com completely free to use.

Jan 31 • 

Martin B. Justesen

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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.

Jan 25 • 

Martin B. Justesen

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10

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#2 Weekly Calculation Time

This week has been a bit challenging for me.

Jan 17 • 

Martin B. Justesen

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5

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#1 Weekly Calculation Time

While I continuously work on fixing bugs and improving tacticsladder.com, I have also considered how to develop this newsletter.

Jan 10 • 

Martin B. Justesen

13

12

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Who Wears the Trousers in the Chess World?

Magnus Carlsen’s recent actions at the World Rapid and Blitz Chess Championships were not just controversial but a significant rebellion against FIDE.

Jan 3 • 

Martin B. Justesen

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