Changelog

What's new

Changes to Blackbox Chess, newest first. Each one is written by hand when it ships, and listed only once it is working on the live site.

November 2026

November 5

See how the clock affects your games

Reports now show how the clock played into your games: how many of your blunders came when you were low on time, how many games you lost on time, and how many of those you were winning when your time ran out. With 50 or more games, the report also names the kind of clock trouble that costs you most: running low on time, moving too quickly, or long thinks in hard positions. A blunder is a move that made your position about two pawns worse. It counts games analyzed from November 5 on.

How it is measured

October 2026

October 24

7-day refund on reports

If a $10 or $5 report isn't useful to you, email us within 7 days for a full refund.

See pricing
October 24

How we check your games

A new page shows how every report is made: the engine, how deep it looks, the rules that sort your mistakes, and one real position you can check yourself.

Read it
October 22

A yearly plan

The training subscription can now be paid yearly: $99 a year instead of $12 a month.

See the plans

See what keeps costing you games. Your first 10 games are free, with no account.

Run my free report