[Retros] More than three, less than five

[Joost de Heer]

On 05/01/2010 08:34 AM, Hans wrote:

> Where can I find (or what is) the soultion of N21. N.Plaksin ?


[very fast analysis]
1.OO! Retraction requires the black king to go to c1, then the bishop 
goes to c8 and b7-b6 can be retracted. The whole retraction requires 
more than 100 halfmoves.

Joost