Solve the blunders and missed opportunities from your own games, analyze them with Stockfish, and jump back to the original game for full context.
GrandChess does not give you generic puzzle positions. It takes the decisions you actually got wrong over the board and turns each one into an exercise you can solve, understand and revisit.
From mistake to training
Blunder Training starts with a concrete position from your own game. First, try to find the better move yourself. If you want to understand the position more deeply, open Stockfish and explore the alternatives. If you want more context, return to the original game and see how the position developed.
A real game you played
A decision that cost you
The moment before the mistake
Solve it yourself
Explore the alternatives
See the full context
This makes the trainer more than a simple puzzle: it connects active solving, deeper analysis and the original game.
Analysis vs training
Game Analysis gives you the complete story of a game. Blunder Training takes one important decision from that story and turns it into an exercise you can solve yourself. When needed, you can then go deeper with Stockfish or return to the original game.
Why your own games?
A position from your own game gives you three useful perspectives. Together they connect training, analysis and game context rather than treating them as separate experiences.
You have to find the move you should have played without simply being shown the answer.
You can use Stockfish to investigate why the stronger move works and explore alternative lines.
You can return to the original game to understand how the position arose and what happened afterwards.
What you can train
Mistakes made in the first phase of the game, where theory and practical decisions meet.
Train opening blundersShort-term oversights such as hanging pieces, missed forks and tactical shots.
Train tactical blundersMistakes in the final phase, where precision and technique decide the result.
Train endgame blundersPositions where you had a strong continuation but did not find it.
Train missed winning movesCheckmate patterns you overlooked in your own games.
Train missed matesMistakes made in positions where you were already better.
Train blunders while winningHow to get started
FAQ
A blunder trainer turns the serious mistakes from your own games into puzzles. Instead of solving random positions, you face the exact decisions where you lost points over the board and try to find the move you should have played.
GrandChess extracts blunders and missed opportunities from the games it imports, then presents each one as a training position. You try to find the better move, analyze the position with Stockfish if you want a deeper explanation, and return to the original game to see what happened before and after the mistake.
Yes. GrandChess organizes blunders by phase of the game, so you can focus on the opening, middlegame, endgame or a mix. You can also train missed winning moves, missed mates and blunders made while already winning.
Yes. From any training position you can open the analysis view and run Stockfish to explore alternative continuations and understand why the stronger move works.
Yes. Every training position links back to the original game, so you can see how the position arose and what happened afterwards. This gives the mistake its full context.
Game Analysis tells the complete story of one game: where the evaluation changed, which moves were strong or inaccurate, and how the position developed. Blunder Training takes one important decision from that story and turns it into an exercise you solve yourself, with Stockfish and the original game available when you need them.
Yes. GrandChess imports games through your Chess.com or Lichess username, and the Blunder Trainer builds its positions from those imported games.
You can start for free: a free account gives you access to blunder training and a Grand Report of your games. Premium unlocks larger Grand Reports and a fuller Grand Training Room. The current plans are listed on the pricing page.
Create a free GrandChess account, import your games, and turn your blunders into focused training you can solve, analyze and understand.