In Euwe-Smyslov (Zurich, 1953), the following position was reached after 37. Rd1.
In the kibitzing section for this game at chessgames dot com, poster Howard stated that 37...Nd3 (instead of the game's 37...Qf3) would have won quickly. (See resulting position below.)
Now, 38. f4 would lose the b-pawn with check after 38...Qd4+ 39. Kg2(or h2).
I wondered why White couldn't effectively answer 37...Nd3 simply by defending the b- and f-pawns along the second rank. Then I realized that 38. Rd2 runs into a fork after 38...Rxf2! 39. Rxf2 (39. Qc8+ Rf8) 39...Qh1+!! 40. Kxh1 Nxf2+ and 41...Nxg4. Similarly, 38. Qe2 would be met by 38...Rxf2 39. Qxf2 Qh1+ 40. Kxh1 Nxf2+ and 41...Nxd1. (See the following two diagrams for these continuations.)
It's rare to see a given combinational theme appear in two distinct settings within an analysis tree.
[Event "Petrosian-Spassky World Championship Match 1966"]
[Site "?"]
[Date "????.??.??"]
[Round "?"]
[White "Tigran Vartanovich Petrosian"]
[Black "Boris Spassky"]
[Result "1-0"]
[ECO "E63"]
1. Nf3 Nf6 2. g3 g6 3. c4 Bg7 4. Bg2 O-O 5. O-O Nc6 6. Nc3 d6 7. d4 a6 8. d5 Na5
9. Nd2 c5 10. Qc2 e5 11. b3 Ng4 12. e4 f5 13. exf5 gxf5 14. Nd1 b5 15. f3 e4 16.
Bb2 exf3 17. Bxf3 Bxb2 18. Qxb2 Ne5 19. Be2 f4 20. gxf4 Bh3 21. Ne3 Bxf1 22.
Rxf1 Ng6 23. Bg4 Nxf4 24. Rxf4 Rxf4 25. Be6+ Rf7 26. Ne4 Qh4 27. Nxd6 Qg5+ 28.
Kh1 Ra7 29. Bxf7+ Rxf7 30. Qh8+ 1-0
@contenchess saidTo display a diagram for a game score, type (omitting the quotes and spaces) "[ pgn ]" just before it and "[ /pgn ]" just after it. If the starting position has moves already made, use also the "fen" tag as shown by clicking the "PGN" button below such a diagram within a post.
I do not know how to post games.
@contenchess said
@Gambrel
Thanks!...I think 🤔
It stopped before move 16.
It did it again, I'm too stupid to get it right, sorry bro