It’s Your Move: daily chess puzzle # 198

Black to play and win, after White plays 1 Nd5? here:

Korchnoi v Portisch, Wijk aan Zee 1968

Solution

The key point is the LPDO Nc4 and its geometrical alignment with the Qh4: or, as Purdy would say it, the jump-check Qh4*Nc4.

1…Bd5! 2 ed g3! hits h2, f2 and the Nc4 0-1

Viktor struggled on, a piece down, but Lajos kept control and won easily enough.