[Retros] Twisted knights.

[Nicolas.Dupont at math.univ-lille1.fr]

Hi retro friends,

I asked myself the following question : How constructing an exact proof
game, such that the 2 knights from a same side are twisted, each of those
knights playing only 3 times ?

I found such a game in 15.5 moves. Is it possible to construct a shorter
one ?

Have a nice weekend,

Nicolas.