This iOS app is a book of chess openings, put together for newcomers and tournament players.

- A unique corpus of information
- Compiled automatedly from recent tournaments
- Focuses on players with a 2400+ FIDE ELO rating
- Lines reflect current state of the art
- Every line analysed and scored by Crafty v23.4
- Currently, there are 58207 lines

- The basic lines of an opening are free of charge
- To view an opening in depth, you must upgrade
- The upgrade fee is $5 USD

- Search by opening and variation
- Explore an opening from its earliest position
- Move forwards and backwards through a line
- Shift from one line to another
- Distinguish popular from unpopular lines
- Keep track via standard algebraic notation
- Change the perspective of the board
- Visualise moves, with animation and sound
- Universal app
- Video demonstration available at website

- Feedback and suggestions most welcome
- If unable to rate/review, contact Apple support

- @benthefolksinger, almost all vars exceed 3