hikaru vs Tunartank

White played 22. Bxg7, moving the bishop from c3 to g7 and capturing the black pawn on g7. Black immediately answered 22...Kxg7, recapturing with the king. The exchange costs White a bishop (3 points) for a pawn (1 point). In addition, the move leaves White's queen on c2 and pawn on e3 undefended, while Black still threatens the advance of a5, the pawn push f4, and the infiltration on g2. White also loses the strong bishop that was controlling the long diagonal a1‑h8 and defending key squares such as d4 and e5.

The engine’s recommendation, 22. Rab1, keeps the bishop on the board, develops the a‑file rook to b1, and immediately attacks the undefended black pawn on b7. By playing Rab1, White preserves material, creates a concrete threat (Rxb7), and improves piece coordination. In contrast, Bxg7 leads to a forced loss of the bishop and gives Black a safer king and more active pieces. The engine line maintains the material balance and exploits Black’s weak b‑pawn, while the blunder hands Black a free piece and eases Black’s defensive tasks.

Avoid Unnecessary Piece Sacrifices: Never give up a piece for a pawn unless you gain a decisive attack or compensation. Prioritize moves that increase pressure on opponent’s weaknesses (e.g., targeting undefended pawns) while keeping your pieces active.