MasterChess 9000
This app has the core functions you need to research chess games.
Search any number of PGN files at lightning speed.
It handles PGN files larger than 2GB. (The only game database that can do this.)
Find every game that reaches a certain position no matter the move order. This powerful technology comes from Chess Openings Wizard.
Use the guidance of only opening moves that have recently been seen where both White and Black are rated 2500+.
Windows and Macintosh versions.
Source code available (sold separately).
Play games against Stockfish. Easily set up handicap games (knight odds) so that you test your ability to win a won game against nearly perfect play. You can also the Stockfish feature to adjust its playing strength from 1350 to 3000 or use the Stockfish level zero to 20 setting.
Order MasterChess for Macintosh
And thanks for being a fan of my apps! I’m excited to share this new game database workhorse with you.

P.S. Are you an app coder who has always wanted to create a game database or a playing program? Email me about purchasing the source code to MasterChess 9000. You’ll need to be using Delphi 13.
What’s New?
What has changed since MasterChess 8000?
The new version is an instant download. (The prior versions were on DVDs that had to be shipped to you.)
The new version has a far stronger engine. Stockfish has made some strides in 12 years.
The game database has more than six million games and is updated through March 2025.
You can update it just by copying any web link to PGN and pasting it into MasterChess. This works even if the games are in a .zip file like The Week in Chess.
You can choose between a Windows version and a Macintosh version.
The searches are faster.
It uses a newer Pedigree database that relies solely on games between 2500+ players that were played over the past ten years. You won’t miss a game because of a different move order.
Next to the Pedigree ribbon, you can see the odds of that variation being played per 1,000 games.
It has the code signing security required by Windows 11.
It supports Silicon Macs (M1, M2, M3, M4) along with most older Intel Macs.
It comes with technical support directly from the programmer.