Chess rules (FIDE)
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intervening pieces
.
3.3. The knight moves to one of the squares nearest to that on which it stands but
not on the same rank, file or diagonal. It does not pass directly over any intervening
square.
3.4. (a) The pawn moves forward to the unoccupied square immediately in front of it
on the same file, or
(b) on its first move the pawn may advance two squares along the same file provided
both squares are unoccupied, or
(c) the p