Editing Plachutta (section)

===3.===
{{Chess diagram
|tright
|{{resize|88%|'''Aleksandr N. Pankrat'ev & Josip Varga''', <br />''Sahovski Glasnik'', 1991}} 
|  |  |  |  |  |  |  |  
|  |  |  |nl|  |  |  |  
|pd|  |  |pl|kl|  |  |bd
|bl|  |  |rl|pd|pd|  |  
|bl|  |kd|pl|pd|  |  |  
|rd|  |  |  |  |pl|  |  
|nd|  |pl|  |pl|  |  |qd
|  |rd|  |nl|  |  |  |  
|White to play and mate in four.
}}
A more sophisticated modern example is the award-winning mate-in-four problem to the right by Aleksandr&nbsp;N. Pankrat'ev and Josip Varga, which was published in ''Sahovski Glasnik'' in 1991 and won 1st prize. White begins with 1.e3, adding protection to d4 and threatening 2.Rc5#. Black's two main defenses are the two captures on e3, but each one allows a different Plachutta interference by White on move 2. If 1...Rxe3, White plays 2.f4!, a Plachutta interference with the queen and bishop: 2...Qxf4 allows 3.Nxe3+ Qxe3 4.Nxe5# and 2...Bxf4 allows 3.Nxe5+ Bxe5 4.Nxe3#. If 1...Bxe3, White plays 2.Bb3+!, a Plachutta interference with the two black rooks: 2...Rbxb3 allows 3.Nxe3+ Rxe3 4.Nb6# and 2...Raxb3 allows 3.Nb6+ Rxb6 4.Nxe3#.
{{clear right}}
* 1.e3 anything-else 2. Rc5#
* 1.e3 Rxe3 2.f4 Qxf4 allows 3.Nxe3+ Qxe3 4.Nxe5#.
* 1.e3 Rxe3 2.f4 Bxf4 allows 3.Nxe5+ Bxe5 4.Nxe3#.
* 1.e3 Bxe3 2.Bb3+ Rbxb3 allows 3.Nxe3+ Rxe3 4.Nb6#. 
* 1.e3 Bxe3 2.Bb3+ Raxb3 allows 3.Nb6+ Rxb6 4.Nxe3#