Jospem vs fabianocaruana

Black chose 18...Rxf4, bringing the f‑rook down the f‑file and capturing White's knight on f4. The move wins a piece but leaves the black queen on h5 completely unprotected. White immediately exploits this by playing 19.Qxh5, winning the queen and turning the material balance into a decisive advantage for White. The threats list shows Black still threatens b4, c4, d1, f4 and h3, while White threatens c6, e5, e6 and h5 – the most critical of which is the direct queen capture on h5. Additionally, Black's queen was listed among the undefended pieces, confirming the tactical oversight.

The engine recommends 18...Qxd1! instead of the rook capture. By exchanging queens on d1, Black eliminates the most vulnerable piece on the board. After 18...Qxd1 19.Rfxd1, the material count is equal (both queens gone) and Black is still up the exchange because the white knight on f4 remains on the board. Crucially, Black avoids the catastrophic loss of the queen and retains the extra piece gained by the later capture on f4. In contrast, Rxf4 allows a forced queen capture that costs Black a full queen (9 points) for only a minor piece gain, a net loss of 8 points.

Never leave a high‑value piece undefended when you can exchange it first. If your queen (or any major piece) is hanging, prioritize removing the threat (e.g., by a queen trade) before pursuing material gains. This prevents tactical blows like Qxh5 that overturn the entire position.