Reader777 vs hikaru

Black pushed the g‑pawn from g6 to g5. The move attacks White’s bishop on f4, forcing White to address the threat. It also prepares a kingside pawn storm (…g4, …h5) and gains a tempo. Threat data shows Black now threatens d4 and e4, while White threatens a6, d6 and h6; Black’s bishops on b7 and g7 are currently undefended, and White’s pawn on b2 is undefended.

The engine rates 10…g5 as the best move because it creates a concrete, immediate threat on a well‑placed enemy piece, gaining a tempo. If White ignores the attack, Black can capture on f4, winning material. Even after White defends, Black obtains space and momentum on the kingside, ready to continue with …g4 or …h5, exploiting the weakened pawn shield around White’s king. Alternative moves (e.g., …c5 or …Nf6) lack this direct pressure and allow White to continue development unimpeded. Thus …g5 forces a defensive reply and improves Black’s initiative.

Create Immediate Threats to Gain Tempo: When you can attack an opponent’s active piece, a pawn push that threatens capture forces the opponent to react, giving you the initiative and the ability to dictate the game's direction.