[Retros] recent improvements

[Mario Richter]

For the 11 plies games I had split the task into subtask.
Merging the results by hand I made a little error:

 - Pf7xe8=Q doesn't belong to that list because it is
   already included in the 10 plies list (and maybe this
   entry irritated Noam ...).

Here the (hopefully) correct list:

    2 Pc7xd8=N
    1 Pe7xd8=N
    2 Pe7xf8=N
    1 Pg7xf8=N
    5 Pe7-e8=B
    2 Pe7xf8=B
   36 Pc7-c8=R
   10 Pd7-d8=R
    4 Pe7-e8=R
   20 Pb7xa8=R
   15 Pd7xc8=R
 1045 Pe7xd8=R
    5 Pd7xe8=R
 1317 Pe7xf8=R
   61 Ph7xg8=R
   33 Pe7-e8=Q
   20 Pb7xa8=Q
    5 Pd7xc8=Q
 1465 Pe7xd8=Q
    4 Pd7xe8=Q
 1299 Pe7xf8=Q
   61 Ph7xg8=Q


With respect to Andrew's question about discovered/double-check,
Noam already gave the answer.

Just a little addition: Doing a byhand-check, it seems, that with
11 plies all correct SPGs ending with double-check have the
pattern wQd7,wPe7,bKf7 in the position before the last move.

(And that is not really surprising, isn't it?)

Regards,

  mario