[Retros] Challenge

[Joost de Heer]

> 4k3/8/5K2/8/8/6N1/3Qpb2/8

> "#1", "#2", "#3", "#4", "#5"


How does white deliver mate in 1, 2, 3, 4 or 5?

And TB results can't be trusted for exact-# compositions. The move that 
is indicated #4 may have a defensive move which leads to a #3, which 
isn't allowed in an exact-# composition, all variations should be of the 
same length.

Joost