General robustness patch from James Harvey:

[sgt/puzzles] / puzzles.but

diff --git a/puzzles.but b/puzzles.but
index 9d67361..71ff48f 100644 (file)
--- a/puzzles.but
+++ b/puzzles.but
@@ -1077,7 +1077,8 @@ after marking.
 Alternatively, with the keyboard, the up and down cursor keys can be
 used to select a peg colour, the left and right keys to select a
 peg position, and the space bar or Enter key to place a peg of the
-selected colour in the chosen position. \q{H} adds a hold marker.
+selected colour in the chosen position. \q{D} or Backspace removes a
+peg, and \q{H} adds a hold marker.
 
 When the guess is complete, the smaller feedback pegs will be highlighted;
 clicking on these (or moving the peg cursor to them with the arrow keys