[Retros] pawn to the 8th rank mates, pending in HO's tasks

[raosorio at fibertel.com.ar]

Hi Hiro,

I think you should include this in your scope. Last PG move is the promotion one,
and categories as mate by pawn itself, discover check, double check and capturing
check are posible. And additional attractive ones: discovering double check and
discovering-capturing double check.

Of course, some considerations  regarding duals from the # point of view (not from the PG
one) have to be made. For instance, if it's the same to promote rook or queen in order
to reach the mating position. Here the record should be based on minimal force.

Best,
Roberto Osorio