Étude  (Leenhouts 1920)

Blancs : Rd7, f5, g5, h4

Noirs :  Rl6, F2, f6, g7

Solution : 1. h5 – fxg5
                  2. f6 –  gxf6
                  3. h6 – Fe5
                  4. Re6 – Fa1
                  5. Rf5 – gain

Étude  (Kubbel 1928)

Blancs : Rh5, Dd1, c2

Noirs :  Rc5, Fd4, Ch1, g2

Solution : 1. c3 – Fe3
                 2. Rh4 – g1 = D
                 3. Dxg1 – Fxg1
                 4. Rh3 – Fe3
                 5. Rg2 – Cf2
                 6. Rf3 – Cd1
                 7. Re2 – égalité