It’s Your Move: daily chess puzzle #259

Black to play and win

F Portisch v Bilek, Zalaegerszeg 1969

Solution

Quite hard to see the way through the tangle of central pieces, but when one sees the jump biff Rf4-f2, noting that from f2 the R also eyes b2, the forcing 1…Nf3! 2 gf Ree4! becomes not too hard to see.

Then a quick check is needed to see that after 3 fe Qf6! Black is winning, for instance 4 Qd3 Rf2 0-1.