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'''[[Main Page|Home]] * [[Chess]] * [[Moves]] * Pawn Push'''
A '''Pawn Push''' is a [[Quiet Moves|quiet]], [[Irreversible Moves|irreversible]] move of a [[Pawn|pawn]] one single step forward, or optionally but only from its initial [[Ranks|rank]], two steps forward. The condition for a [[Pseudo-Legal Move|pseudo-legal]] pawn push is that its [[Target Square|target square]] ahead, the [[Stop Square|stop square]], is [[Occupancy|empty]], while the [[Origin Square|origin square]] is obviously occupied by the pawn of the [[Side to move|side to move]].
=Promotion=
A push from the seventh (second) rank is a [[Promotions|promotion]].
<span id="DoublePush"></span>
=Double Push=
The double pawn push from the initial rank requires both squares ahead empty. [[Make Move|Making]] a double push is a precondition to set the [[En passant|en passant]] target square in the obtained [[Chess Position|position]], as specified by initial [[Forsyth-Edwards Notation]] (FEN) unconditionally, where todays programs are instructed to set [[Forsyth-Edwards Notation#Enpassanttargetsquare|en passant target square]] if the en passant would be [[Pseudo-Legal Move|pseudo-legal]] (an opponent pawn left or right) or even better strictly [[Legal Move|legal]] <ref>[http://www.talkchess.com/forum/viewtopic.php?topic_view=threads&p=219015&t=23806 Re: Arasan test suite update] by [[Steven Edwards]], [[Computer Chess Forums|CCC]], September 19, 2008</ref>, also considering [[Incremental Updates|updating]] [[Zobrist Hashing|Zobist keys]] during [[Make Move|make move]] to avoid dissimilarity of otherwise [[Repetitions|repeated]] [[Chess Position|positions]] if the first occurrence happened after a double pawn push with no en passant capture actually possible <ref>[http://www.talkchess.com/forum/viewtopic.php?t=33397 en passant and hash key calculation] by [[Fred Hamilton]], [[Computer Chess Forums|CCC]], March 21, 2010</ref>.
=See also=
* [[Pawn Pushes (Bitboards)]]
=External Links=
* [https://en.wikipedia.org/wiki/Pawn_%28chess%29#Movement Pawn Movement from Wikipedia]
=References=
<references />
'''[[Moves|Up one Level]]'''
A '''Pawn Push''' is a [[Quiet Moves|quiet]], [[Irreversible Moves|irreversible]] move of a [[Pawn|pawn]] one single step forward, or optionally but only from its initial [[Ranks|rank]], two steps forward. The condition for a [[Pseudo-Legal Move|pseudo-legal]] pawn push is that its [[Target Square|target square]] ahead, the [[Stop Square|stop square]], is [[Occupancy|empty]], while the [[Origin Square|origin square]] is obviously occupied by the pawn of the [[Side to move|side to move]].
=Promotion=
A push from the seventh (second) rank is a [[Promotions|promotion]].
<span id="DoublePush"></span>
=Double Push=
The double pawn push from the initial rank requires both squares ahead empty. [[Make Move|Making]] a double push is a precondition to set the [[En passant|en passant]] target square in the obtained [[Chess Position|position]], as specified by initial [[Forsyth-Edwards Notation]] (FEN) unconditionally, where todays programs are instructed to set [[Forsyth-Edwards Notation#Enpassanttargetsquare|en passant target square]] if the en passant would be [[Pseudo-Legal Move|pseudo-legal]] (an opponent pawn left or right) or even better strictly [[Legal Move|legal]] <ref>[http://www.talkchess.com/forum/viewtopic.php?topic_view=threads&p=219015&t=23806 Re: Arasan test suite update] by [[Steven Edwards]], [[Computer Chess Forums|CCC]], September 19, 2008</ref>, also considering [[Incremental Updates|updating]] [[Zobrist Hashing|Zobist keys]] during [[Make Move|make move]] to avoid dissimilarity of otherwise [[Repetitions|repeated]] [[Chess Position|positions]] if the first occurrence happened after a double pawn push with no en passant capture actually possible <ref>[http://www.talkchess.com/forum/viewtopic.php?t=33397 en passant and hash key calculation] by [[Fred Hamilton]], [[Computer Chess Forums|CCC]], March 21, 2010</ref>.
=See also=
* [[Pawn Pushes (Bitboards)]]
=External Links=
* [https://en.wikipedia.org/wiki/Pawn_%28chess%29#Movement Pawn Movement from Wikipedia]
=References=
<references />
'''[[Moves|Up one Level]]'''
