Zepler doubling, in which both thematic pieces are of same strength.
See also: Zepler doubling; Brunner-Turton doubling.
Bakcsi, György
Die Schwalbe, 1967
1st Prize
1.h2 Rg1 2.h1=Q Rf5 3.Qh8 Rgg5 4.Qxe5 Rxe5#
FEN: 8/1p1p4/3Pp3/4P1RR/3pkp2/3p1p1p/3P1P2/5K2
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