◇ Just read — no move neededBold beyond belief
大胆穿心 (also 大刀剜心) is a sacrifice: the chariot crashes onto the centre advisor at e8 — a square the king himself guards. It looks like suicide. It is mate, because the cannon behind fires through Black's own centre pawn: the king's recapture would land him in check, the horse on d9 blocks its own door, and the soldier on f8 holds the last exit.