Estudio de Leonid Kubbel (1935). Blancas juegan y ganan.

1.Da5+ Rc6 [ 1...Rxa5 2.Ac7#; 1...Rb7 2.Dc7+ Ra8 3.Da7#] 2.Dc7+ Rd5 3.Dd7+ Re4 [ 3...Rc5 4.Aa7#] 4.Dc6+ Rf5 5.De6+ Rg5 6.Dh6+ Rxh6 [ 6...Rf5 7.Df4#; 6...Rg4 7.Df4+ Rh3 8.Df3+ Rh4 9.Dxh1+ Rg4 10.Dg2+ Rf5 11.Df3+ Rg5 12.Df4#] 7.Af4++ 1–0