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Created page with "'''Home * Evaluation * Pawn Structure * Hidden Passed Pawn''' The '''Hidden Passed Pawn''' is an evaluation term used in Crafty, in the terminology..."
'''[[Main Page|Home]] * [[Evaluation]] * [[Pawn Structure]] * Hidden Passed Pawn'''
The '''Hidden Passed Pawn''' is an evaluation term used in [[Crafty]], in the terminology proposed by [[Hans Kmoch]] it is referred to as a [[Candidates (Bitboards)#Sneaker|Sneaker]] <ref>[[Hans Kmoch]] ('''1959, 1990'''). ''Pawn Power in Chess''. New York: Dover, 1990. Previous ed.: New York: McKay, 1959. ISBN 0-486-26486-6</ref> <ref>[https://www.chess.com/forum/view/chess-equipment/pawn-power-in-chess-by-hans-kmoch-glossary-of-terms Pawn Power in Chess by Hans Kmoch - Glossary of Terms - Chess Forums] - [https://en.wikipedia.org/wiki/Chess.com Chess.com]</ref>. It is a [[Pawn Rams (Bitboards)|rammed pawn]] already on the opponent side of the board without further [[Sentry|sentries]], which may become a [[Passed Pawn|passer]] through a sacrificial combination usually by a [[Faker|faker]], which possibly allows the opponent to establish a passer as well, though at least two ranks less advanced and losing the [[Pawn Race|pawn race]] assuming both [[Unstoppable Passer|unstoppable]].
=Sample=
Suppose that white has pawns on a6 and b5, and black on a7. At first glance we have a [[Backward Pawn|backward pawn]] on b5, which is bad for white. However, after playing b5-b6, white gets a passed pawn either there or on a6. For that reason the pawn on a6 should be termed "a hidden passed pawn" and awarded a bonus if "unstoppable".
<fentt border="double" style="font-size:24pt">8/p7/P6p/1P5P/6P1/8/8/8</fentt>
[[Faker|Fakers]] on b5 and g4 make a6 and h5 Sneakers
=Comparison with Candidates=
If we put the sneakers of the above position one rank back so that they become helpers of the now neighbored [[Candidate Passed Pawn|candidates]], the usual idea is to advance the candidates instead of the helpers. The lonesome [[Sentry|sentry]], forced to capture, may be recaptured to establish an exclusive passer on the candidate's file. Alternatively instead of the recapture, the helper may advance to become a passer as well, which yields to a [[Transposition|transposition]] of the hidden passed pawn idea. This may be stronger if the pawn becomes an [[Unstoppable Passer|unstoppable passer]] leaving the opponent king outside its [[Rule of the Square#TheSquareofthePawn|square]], while the candidate could be caught.
<fentt border="double" style="font-size:24pt">8/p7/7p/PP2k3/6PP/8/6K1/8</fentt>
a5 or b5?
=See also=
* [[Candidate Passed Pawn]]
* [[Faker]]
* [[Passed Pawn]]
* [[Unstoppable Passer]]
=References=
<references />
'''[[Pawn Structure|Up one Level]]'''
[[Category:Hans Kmoch]]
The '''Hidden Passed Pawn''' is an evaluation term used in [[Crafty]], in the terminology proposed by [[Hans Kmoch]] it is referred to as a [[Candidates (Bitboards)#Sneaker|Sneaker]] <ref>[[Hans Kmoch]] ('''1959, 1990'''). ''Pawn Power in Chess''. New York: Dover, 1990. Previous ed.: New York: McKay, 1959. ISBN 0-486-26486-6</ref> <ref>[https://www.chess.com/forum/view/chess-equipment/pawn-power-in-chess-by-hans-kmoch-glossary-of-terms Pawn Power in Chess by Hans Kmoch - Glossary of Terms - Chess Forums] - [https://en.wikipedia.org/wiki/Chess.com Chess.com]</ref>. It is a [[Pawn Rams (Bitboards)|rammed pawn]] already on the opponent side of the board without further [[Sentry|sentries]], which may become a [[Passed Pawn|passer]] through a sacrificial combination usually by a [[Faker|faker]], which possibly allows the opponent to establish a passer as well, though at least two ranks less advanced and losing the [[Pawn Race|pawn race]] assuming both [[Unstoppable Passer|unstoppable]].
=Sample=
Suppose that white has pawns on a6 and b5, and black on a7. At first glance we have a [[Backward Pawn|backward pawn]] on b5, which is bad for white. However, after playing b5-b6, white gets a passed pawn either there or on a6. For that reason the pawn on a6 should be termed "a hidden passed pawn" and awarded a bonus if "unstoppable".
<fentt border="double" style="font-size:24pt">8/p7/P6p/1P5P/6P1/8/8/8</fentt>
[[Faker|Fakers]] on b5 and g4 make a6 and h5 Sneakers
=Comparison with Candidates=
If we put the sneakers of the above position one rank back so that they become helpers of the now neighbored [[Candidate Passed Pawn|candidates]], the usual idea is to advance the candidates instead of the helpers. The lonesome [[Sentry|sentry]], forced to capture, may be recaptured to establish an exclusive passer on the candidate's file. Alternatively instead of the recapture, the helper may advance to become a passer as well, which yields to a [[Transposition|transposition]] of the hidden passed pawn idea. This may be stronger if the pawn becomes an [[Unstoppable Passer|unstoppable passer]] leaving the opponent king outside its [[Rule of the Square#TheSquareofthePawn|square]], while the candidate could be caught.
<fentt border="double" style="font-size:24pt">8/p7/7p/PP2k3/6PP/8/6K1/8</fentt>
a5 or b5?
=See also=
* [[Candidate Passed Pawn]]
* [[Faker]]
* [[Passed Pawn]]
* [[Unstoppable Passer]]
=References=
<references />
'''[[Pawn Structure|Up one Level]]'''
[[Category:Hans Kmoch]]
