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'''[[Main Page|Home]] * [[Chess]] * [[Tactics]] * Undermining'''
'''Undermining''' is a chess tactic where an opponent guard, defending an attacked piece, is captured. While the removed guard itself is usually not [[En prise|en prise]] and the attacker even has a negative [[Static Exchange Evaluation|static exchange evaluation]], the point is that there is no recapture available to perpetuate the guards defensive obligations, and leaving a former attacked but guarded piece en prise, with a final net gain for the attacker. Those pattern may be considered in [[Quiescence Search|quiescence search]] to encourage capturing pawns and pieces with otherwise negative SEE ...
=Sample=
... like Rxc7, capturing the lonesome guard of Be6:
<fentt border="double" style="font-size:24pt">3k4/2n3p1/3bb3/7p/8/8/6P1/2R1R2K</fentt>
3k4/2n3p1/3bb3/7p/8/8/6P1/2R1R2K w - -
=Counter Sample=
If the undermined piece has a [[Zwischenzug]], things are more complicated. Here quiescence has to deal with [[Check|checks]] below the [[Horizon Node|horizon]], to become aware undermining does not work here ...
<fentt border="double" style="font-size:24pt">3k4/2n3p1/3bb3/7p/8/6P1/8/2R1R2K</fentt>
3k4/2n3p1/3bb3/7p/8/6P1/8/2R1R2K w - -
=See also=
* [[Combination]]
* [[Deflection]]
* [[En prise]]
* [[Overloading]]
* [[Quiescence Search]]
* [[Square Attacked By]]
* [[Static Exchange Evaluation]]
=External Links=
* [https://en.wikipedia.org/wiki/Undermining_%28chess%29 Undermining (chess) from Wikipedia]
* [https://en.wikipedia.org/wiki/Undermine Undermine disambiguation page from Wikipedia]
'''[[Tactics|Up one Level]]'''
'''Undermining''' is a chess tactic where an opponent guard, defending an attacked piece, is captured. While the removed guard itself is usually not [[En prise|en prise]] and the attacker even has a negative [[Static Exchange Evaluation|static exchange evaluation]], the point is that there is no recapture available to perpetuate the guards defensive obligations, and leaving a former attacked but guarded piece en prise, with a final net gain for the attacker. Those pattern may be considered in [[Quiescence Search|quiescence search]] to encourage capturing pawns and pieces with otherwise negative SEE ...
=Sample=
... like Rxc7, capturing the lonesome guard of Be6:
<fentt border="double" style="font-size:24pt">3k4/2n3p1/3bb3/7p/8/8/6P1/2R1R2K</fentt>
3k4/2n3p1/3bb3/7p/8/8/6P1/2R1R2K w - -
=Counter Sample=
If the undermined piece has a [[Zwischenzug]], things are more complicated. Here quiescence has to deal with [[Check|checks]] below the [[Horizon Node|horizon]], to become aware undermining does not work here ...
<fentt border="double" style="font-size:24pt">3k4/2n3p1/3bb3/7p/8/6P1/8/2R1R2K</fentt>
3k4/2n3p1/3bb3/7p/8/6P1/8/2R1R2K w - -
=See also=
* [[Combination]]
* [[Deflection]]
* [[En prise]]
* [[Overloading]]
* [[Quiescence Search]]
* [[Square Attacked By]]
* [[Static Exchange Evaluation]]
=External Links=
* [https://en.wikipedia.org/wiki/Undermining_%28chess%29 Undermining (chess) from Wikipedia]
* [https://en.wikipedia.org/wiki/Undermine Undermine disambiguation page from Wikipedia]
'''[[Tactics|Up one Level]]'''
