It’s Your Move: daily chess puzzle #332
Examine: 1 Rd6 Rc1+ 2 Kh2 Qe5+ (hitting the LPDO Rd6)

Tal v Szymczak, Lublin 1974
Solution
3 Qf4 would lose: Queen’s come off, and White has insufficient fire power to mate or promote the e pawn.
So 3 f4! when 3…Qd6, and it is fairly easy to see that White has the “anchor” of a draw by repetition. I always like it when I have such a safety blanket.

But woe is me! Despite spending a long time on it, and despite setting the pieces out on the board (but not moving them) I simply couldn’t see what Tal saw.
And, as always, when you see the win, in hindsight it becomes obvious. And worse, I saw the winning move 4 Bh5! but rejected it because of 4…Qe6[]

The optical illusion I missed was that after 4..Qe6, 5 Qf8+ wins: the f4 pawn guards two escape squares, so Black is forced to interpose his Q on f7, where it is captured with mate.
Simple? But I was blind to it.