Forsberg twins
Twinning by changing the type of a single piece.
Forsberg, Henry Olof Axel
Revista Romana de Sah, 1935
1st Prize
h#2 (3+2)
b) bRa6
c) bBa6
d) bSa6
e) bPa6
a) 1.Qf6
Sc5
2.Qb2
Ra4#
b) 1.Rb6
Rb1
2.Rb3
Ra1#
c) 1.Bc4
Se1
2.Ba2
Sc2#
d) 1.Sc5
Sc1
2.Sa4
Rb3#
e) 1.a5
Rb3+
2.Ka4
Sc5#