Editing Helpmate (section)

=== Twinning ===
{{Chess diagram
|tright
|Henry Forsberg, 1935
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|kd|  |  |nl|  |  |  |  
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|Helpmate in 2: a) diagram, b) replace queen on a6 with a black rook, c) with a bishop, d) with a knight e) with a pawn
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Another way of giving variety to the play of a helpmate is ''twinning''. Here, more than one problem is wrought from a single diagram by making small changes to it, such as moving a piece from one square to another, adding or removing a piece, turning the board round or some other device. Twinning is occasionally found in other types of problems, but is particularly common in helpmates. The example shown is a helpmate in 2 by [[Henry Forsberg]] (published in 1935 in ''Revista Romana de Şah''). The twins are created by substituting the black queen on a6 with a different piece. The solutions are:

:a) diagram position: '''1. Qf6 Nc5 2. Qb2 Ra4#'''
:b) with black rook at a6: '''1. Rb6 Rb1 2. Rb3 Ra1#'''
:c) with black bishop at a6: '''1. Bc4 Ne1 2. Ba2 Nc2#'''
:d) with black knight at a6: '''1. Nc5 Nc1 2. Na4 Rb3#'''
:e) with black pawn at a6: '''1. a5 Rb3+ 2. Ka4 Nc5#'''
{{Clear}}