While recording game, one easily stores extra moves that were not actually played.
Any extra moves can be delete at any time they are visible in the board.
When you want to delete move, first select it by clicking it with right mouse button. This
creates red circle around the selected move. Then press delete move(s) button .
If you want to delete several moves at once, you can select them one by one. First move is
selected as above and other moves are selected by keeping shift pressed and then selecting
additional moves with right mouse clicks. All selected moves should have red circles around
them. When you have selcted all stones you want, you can delete them with delete moves
button .