hikaru vs gurelediz

White chose the pawn break 18.e5, pushing the e‑pawn one square forward. The move looks aggressive but it does not create an immediate threat. Black replies 18...d4, driving a pawn into White's camp, hitting the queen on d2 and opening the d‑file. The pawn on e5 also leaves the f3 pawn and the h1 rook still undefended, while Black’s knight on h5 and rook on h8 remain completely undefended. In short, White gains a space advantage but allows Black to seize the initiative with a central break and leaves a tactical target (the h5‑knight) untouched.

The engine’s top move 18.Ng3 attacks the undefended h5‑knight, covers the e4‑square (one of Black’s stated threats), and creates a concrete tactical threat of Nxh5. If Black captures 18...Nxg3, White recaptures 19.hxg3, opening the h‑file and gaining active king‑side play while Black’s h5‑knight disappears. Moreover, the knight on g3 helps to restrain Black’s d‑pawn, making the powerful 18...d4 break far less effective. By playing Ng3 White improves piece activity, eliminates an opponent’s hanging piece, and neutralises Black’s immediate threats, whereas 18.e5 merely pushes a pawn and hands Black the tempo to counter‑attack.

Create threats before launching pawn breaks: Always look for a forcing idea—such as attacking an undefended piece or covering a key square—before committing to a pawn advance. Activating a piece (Ng3) that hits a hanging enemy piece and controls critical squares is far stronger than a blind pawn push.