Meeting the threat of a <DISCOVERED ATTACK> by attacking the masked line piece, which Weteschnik calls the <PRINCIPAL ATTACKER>.

---

NOTE: Seirawan's comment in which he saw the *only* defense to the <DISCOVERY CHAIN> White g1-king + Black g2-bishop + Black g5-queen as 1 h2-h4!, meeting 1 ... ♗g2x♗f3+?? 2 h4x♕g5, in his analysis of a variation of Nakamura vs F Vallejo Pons, 2011.