Editing Plachutta (section)

===1.===
{{algebraic notation|pos=secleft}}
{{Chess diagram
|tright
|{{resize|88%|'''William Shinkman''', ''White Rooks'', 1910}} 
|  |  |  |kd|  |  |  |kl
|rl|  |  |pd|  |  |rl|  
|pd|  |  |pl|  |  |  |  
|  |  |  |  |  |  |  |  
|  |  |  |pl|  |  |  |  
|  |  |  |  |  |  |  |  
|qd|  |  |  |  |  |bd|  
|  |  |  |  |  |  |  |  
|White to play and mate in three.
}}
The problem to the right is a relatively simple example by William Shinkman, published in ''White Rooks'', 1910. It is a mate in three (white moves first and must checkmate black in three moves against any defence). The {{chessprobgloss|key}} (first move of the solution) is 1.d5!. Examining the initial position reveals why this works: white would like to play either 1.Ra8 or 1.Rg8, but the former is prevented by black's bishop and the latter is prevented by black's queen. 1.d5 blocks the paths of both black pieces to these squares, and whichever black piece takes the pawn interferes with the other and has to defend against both threats itself (to use chess jargon, it becomes [[Overloading (chess)|overloaded]]). So, if 1...Qxd5 white can play 2.Ra8+ Qxa8, when the queen is deflected from her defence of g8, allowing 3.Rg8#, while if 1...Bxd5 white can play 2.Rg8+ Bxg8, deflecting the bishop from defence of a8, allowing 3.Ra8#.
{{clear right}}