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* J<span style="vertical-align: sub;font-size: 80%;">i</span> is temporary superset of B<span style="vertical-align: sub;font-size: 80%;">i</span> not necessarily lose positions
The algorithm starts in enumerating all Black-to-move [[Checkmate|checkmate]] positions B<span style="vertical-align: sub;font-size: 80%;">0</span> with the material configuration under consideration, an [[Move Generation#Reverse|un-move generator ]] is used to to build predecessor or parent positions. The un-move generation is similar to [[Move Generation|move generation]], with the difference that it is illegal to start in [[Check|check]], but legal to un-move into check, and illegal to capture, but legal to un-capture by leaving an opponent piece behind.
'''for''' (i=0; B<span style="vertical-align: sub; font-size: 80%;">i</span>; i++)
