Vant Kruijs Opening Puzzle (Rated 922): Pin — Gain Material
A relative pin can turn an apparently active defender into a tactical target. Here, Black’s bishop is aligned with a more valuable piece behind the white knight, making the knight’s apparent freedom misleading. The key idea is to exploit that alignment immediately, removing the defender and preserving a decisive material advantage. This is a classic middlegame lesson: when a pinned piece protects another unit, calculate whether the pin can be converted into a direct gain.