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|| [[Backward Pawn]]
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| for each square, the strong square is the one, which is attacked by a pawn of one color and never may be attacked by a pawn of opposite color <ref>Not every square of the board may be the strong one. The squares which may be strong for the White are the following: b6, b7, c5, c6, c7, d5, d6, d7, e5, e6 ,e7, f5, f6, f7, g6, g7. For the Black the symmetry holds</ref>
|-
| style="text-align:right;" | 10
| for each pawn, these are pawns behind the strong squares
| [[Rook on Open File|Rooks on semiopen files]]
| style="text-align:right;" | 25
| for each rook ||
|-
| Rooks attacks on open files
| Pieces [[Mobility|mobility]]
| style="text-align:right;" | 1
| for each attack ||
|-
| [[Passed Pawn|Passed pawn]] [[Blockade of Stop|blocks]]
