Of black's 38 moves, 14 are made by knights, including seven moves in a row between move 17 and move 23.

20...Nd2 is a very appealing move.

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I was black....

I played a french with 4...♕d7

He won enough fast....

and after the game he said: " The ♕d7's french doesnt work... yeah.... its a weak move..."

Next time we'll met I'll say "U think Qd7 its a real poor move?!...so, lets go to talk with Mr. Planinc!"

The text 22 Be3 (error) allows 22…Nxe5. White cannot respond with 23 dxe5 because of 23…d4, below, forking the knight and pinned bishop, while simultaneously putting the queen en prise.

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White’s answer after 20…Nd2 21 Kxd2 Nxd3, is the simple 22 Ke2.

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Now, if black tries 22…Nxe5, then after the exchange 23 dxe5 d4 24 Qd3 dxc3 25 Qxd7+ Rxd7 26 Rhd1 Ba6+ 27 Rd3 white is ahead.

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In this game, however, black's bold moves triumphed.

When I'd wrote my post, my assumption was the clearness of my joke......

I believe he got the GM title without having been an IM. I recall a book by Pachman that had a whole chapter about Planinc's debut in a GM tourney... with players like Gliga.

The following is from L.Pachman's book You mentioned. There were 10 grandmasters in the field. Planinc, at a time, was only a Candidate Master. Prior to the tournament he won the championship of his hometown Ljubljana (the capital of Slovenia), where Vidmar Memorial 1969 was to take place. That's how Planinc qualified for the tournament.

"With one round to go Planinc was half a point ahead of Gligoric, though a tie seemed the most likely result, for Gligoric was to play the tailender, Stupica, while Planinc had a much more dangerous opponent in grandmaster Gheorghiu. Many players in Planinc's place would have been content with a tie and have used the advantage of the white pieces to obtain the necessary half point. As things turned out this would have been easy to achieve, for Gheorghiu offered him a draw twice during the game. The young player, however, had other ideas and first sacrificed a pawn in an unclear position and then later mad a perfectly correct rook sacrifice. The game, which turned out to be one of the most beautiful of the tournament, gave Planinc the final point, which caused a great sensation in the world of chess. An unknown player had won first prize and had satisfied the standard for the award of the grandmaster title- a title which he could not recievee because the FIDE rules do not permit such jumps. A player first has to be a master before he can become a grandmaster."

Decisive Games in Chess History - Ludek Pachman

27...Ng4+ was much stronger, following with 28. Kd3 Qg7 29. h4 Nf2+ 30. Ke2 Nxh1 31. Rxh1 f4 32. Qe5 Qxe5 33. dxe5 d4 34. Rg1 dxc3 35 bxc3 fxg3 36. Rxg3 Rf5 37. Ke3 Rxe5+