Our story
Your games contain a pattern for why you lose.
Most players do thousands of generic puzzles and wonder why their rating stays flat. The puzzles weren't wrong. They just weren't yours.
“In Greek mythology, Cassandra could see exactly what was coming — every mistake, every consequence — but no one listened. Your games contain that same prophecy.”
The name behind the platform
Why Cassandra exists
Every blunder, every misread position, every moment you played the wrong side of a threat — it's all there in your game history. What if the training came directly from your games instead? That's what Cassandra does. It finds the mistakes in your games and builds personalised puzzles around them — not generic tactics, not engine theory disconnected from how you actually play.
Not all mistakes are the same
A missed tactic is different from misjudging a threat. Misreading your opponent's intention is different from failing to see the board from their side. Cassandra assigns the puzzle type that actually addresses what went wrong.
What you missed
Standard tactical puzzles generated from your blunders — find the move you should have played.
Retrograde analysis
Work backwards from a position to understand what move just happened and why it matters.
Move strength ranking
Rank three candidate moves from best to worst — training evaluation, not just pattern matching.
Threat or bluff?
Decide whether your opponent's last move is a real threat or a bluff you can safely ignore.
Flip the board
Play from your opponent's perspective — see the position through their eyes and find their best response.
Built for how you actually lose
Engine analysis tells you what the best move was. That matters — but it's only half the picture. Your opponents aren't engines. They have patterns, tendencies, moves they reach for under pressure. Cassandra combines engine precision with real playing patterns, so you're training against how people actually play, not just how computers say they should.
Chess improvement shouldn't be locked behind a paywall
The best tools in chess have always been expensive, subscription-heavy, or buried inside platforms that want your money before they help you improve. Cassandra is free to use. No paywall, no subscription. Because getting better at chess shouldn't depend on what you can afford.
— Josh
j_r_b_01 on Chess.com