Memory for relationships between pieces
The objective is not to memorise a picture. Training requires continuously updating lines, controlled squares, possible captures, and which pieces changed location after the previous move.
Standard, Expert, and Insane
Standard retains a subtle distinction between sides and visible notation. Expert hides concealment colours and notation, while Insane removes piece glows from the board. Each level increases working-memory demand.
A hint is a brief map check
A limited number of hints reveals only the information appropriate to the mode and only as a short flash. It can correct your internal position without turning the exercise into a normal game with visible pieces.
Increase difficulty safely
- Begin with Standard and after every move name both kings, both queens, and the pieces that can enter contact next.
- Move to Expert only when you can reconstruct the latest moves and identify the side to move without guessing.
- Use Insane for short concentration sets; after losing the position, spend one hint and deliberately rebuild the map.
Complete exercise available without sign-in
Guests can choose a bot, colour, concealment level, and play with the hint limit. Permanent result counters and training history require an account.