[Retros] Longest possible games with specific pieces moving

[Mario Richter]

Hello,

in another thread, Ryan McCracken wrote:


> There are examples (several retros by N. Plaksin) that make good

> use of the 50-move rule. ...


Probably the most famous chess problem with a reference to the
50-moves-rule is the questions about the longest possible chess game.

This question had inspired me to ask myself some smiliar questions,
for which I would like to compare your answers with mine.

(1) What is the longest possible chess game, if both sides only
    move their knights and the 50-move-rule applies?

    (Using E.Angelini's stenochess notation, a different formulation
     of the above question would be: What is the longest legal
     stenochess string consisting solely of 'N's [N=kNight move],
     if the 50-move-rule applies?)

(2) What is the longest possible chess game, if both sides only
    make pawn moves? (To make it clear, after a promotion, promoted
    pawns are not allowed to move.)

    (Or in E.Angelini's stenochess notation: What is the longest legal
     stenochess string consisting solely of 'P's [P=pawn move]?)

I can imagine that these questions have already been asked in the
past. If that is the case, it would be nice if somebody can provide some
information about author/source/solution.

Thanks!

   mario