Blackmar Diemer Gambit Declined Lamb Defense Puzzle (Rated 1484): Win Material — Discovered Attack

This middlegame puzzle shows how a tactical refutation can turn king safety into a decisive material gain. Black’s active pieces coordinate against White’s king and loose kingside structure, while White’s bishop and knight setup leaves key squares vulnerable. The critical idea is a discovered attack: one piece moves with tempo, opening a line for another attacker and forcing White into a defensive sequence that loses material. In gambit positions, activity often matters more than static balance.