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 Wysłany: Wto 6:25, 03 Wrz 2013 Temat postu: Hidden Passed Pawn |
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Hidden Passed Pawn,[link widoczny dla zalogowanych]
The hidden passed pawn is an evaluation term used in Crafty,[link widoczny dla zalogowanych], in the terminology proposed by Hans Kmoch it is referred to as a Sneaker [1]. It is a rammed pawn already on the opponent side of the board without further sentries,[link widoczny dla zalogowanych], which may become a passer through a sacrificial combination usually by a faker,[link widoczny dla zalogowanych], which possibly allows the opponent to establish a passer as well,[link widoczny dla zalogowanych], though at least two ranks less advanced and losing the pawn race assuming both unstoppable.
Sample
Suppose that white has pawns on a6 and b5,[link widoczny dla zalogowanych], and black on a7. At first glance we have a backward pawn on b5,[link widoczny dla zalogowanych], which is bad for white. However,[link widoczny dla zalogowanych], after playing b5-b6,[link widoczny dla zalogowanych], 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".
Comparison with Candidates
If we put the sneakers of the above position one rank back so that they become helpers of the now neighbored candidates,[link widoczny dla zalogowanych], the usual idea is to advance the candidates instead of the helpers. The lonesome sentry,[link widoczny dla zalogowanych], forced to capture,[link widoczny dla zalogowanych], may be recaptured to establish an exclusive passer on the candidate's file. Alternatively instead of the recapture,[link widoczny dla zalogowanych], the helper may advance to become a passer as well,[link widoczny dla zalogowanych], which yields to a transposition of the hidden passed pawn idea. This may be stronger if the pawn becomes an unstoppable passer leaving the opponent king outside its square,[link widoczny dla zalogowanych], while the candidate could be caught.
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