Introducing √50

Ser-=5

f1= √50*
ph7=K

1. h5 2. h4 3. h3 4. h2 5. h1=√50, b5 =

* The √50 is a leaper (1,7 - 5,5), i.e. a √50 could move in b8, h2 and f6. Cfr. A. Dickins, A Guide to Fairy Chess, Dover Publications Inc., New York 1971, p. 11.