Starts analysing the current position shown on the board. Analysis will continue until the Stop button is clicked, or the page holding the analysis panel is closed.

Stop engine analysis. You can leave the engine running while using other pages, however you should stop the engine when you've finished using it, as it will use up CPU on your machine while still running. Closing a window with a running engine should automatically stop the engine.

The Annotate feature allows you to use the engine to analyse a full game. It is described in more detail in the Annotate Game section of the User Guide.

The lock/unlock button allows you to control if the engine follows the current position as you move around the move list. If the engine is locked, it will continue to analyse the current position until the engine is stopped, and restarted on a new position. When unlocked, the engine will automatically start analysing new positions as you move through the move list.

The engine settings button launches the engine settings window. Any new engines added will require a page load before showing up in the engine list.

The increase and decrease lines button controls how many lines the engine will examine at each position. Increasing the number of lines will decrease the depth you will be able to reach in a given period of time, so you should allow for this when deciding how long to take on each position. You can change the number of lines during analysis, however any change to this setting will restart the analysis of the current position and changing these settings is much quicker when the engine is stopped.

The play best button allows you to insert the best move found by the engine into the move list. If the engine is currently unlocked, the move will be played, and the engine will start analysing the position resulting after the move. This action can also be triggered using the keyboard, by pressing the Space bar.