Unstoppable+Passer

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a passed pawn with an empty frontspan guaranteed to safely promote according to the length of the span. If the opponent has no pieces left, this is true if the opponent king is outside the square of the pawn, or the own king controls the complete frontspan. Unstoppable passers may be regarded with a huge, possibly tempo depending evaluation bonus, specially if advanced, but one should consider "unstoppable" advanced candidates or hidden passers and multiple threats as broached in the Réti Endgame Study accordantly.
 * Unstoppable Passer**,

With opponent pieces left, programs usually perform the default passer evaluation concerning advancement and square controls and possibly SEE of stop and telestop squares, and rely on search to solve all kind of possible tactics. Some programs care about **one** opponent piece left, specially knight or bishop, to perform fill algorithms for a trajectory analysis to determine (advanced) passers are unstoppable or can be blocked or captured in time.

=See also=
 * Candidate Passed Pawn
 * KPK
 * Hidden Passed Pawn
 * Outside Passed Pawn
 * Passed Pawn Extensions
 * Pawn Race
 * Réti Endgame Study
 * Rule of the Square
 * Set-wise Rule of the Square
 * Szén Position
 * Tarrasch Rule
 * Tempo

=Forum Posts=
 * [|Rule of Square test position] by Charles Roberson, CCC, May 15, 2008
 * [|An unstoppable passed pawn] by Marek Kwiatkowski, CCC, June 11, 2010
 * [|Improving evaluation of passed pawns] by Ben-Hur Carlos Vieira Langoni Junior, CCC, January 22, 2011 » Candidate Passed Pawn

=External Links= > [|Joe Satriani], [|Mike Keneally], Bryan Beller, Marco Minnemann > media type="youtube" key="5Op0kWsdHT0"
 * [|Passed Pawn Evaluation] from [|Rybka 1.0 beta vs. Fruit Evaluation] by Zach Wegner » Rybka Controversy
 * Joe Satriani - [|Front And Center] - [|Unstoppable Momentum], live from the [|Iridium] 2014, [|YouTube] Video

=References= =What links here?= include page="Unstoppable Passer" component="backlinks" limit="20"
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