Blackmar Diemer Gambit Zeller Defense Deflection in Chess

In the Blackmar-Diemer Gambit Zeller Defense, “deflection” is a tactical motif where Black tries to pull a key White piece away from an important square or line. Typically, after the defining setup of the Zeller Defense, Black’s idea is to interfere with White’s central/queenside control so the gambit’s follow-up loses accuracy. For an intermediate player, the defining feature is the moment Black’s move forces White’s attention to a different target than the one that would otherwise matter most.