zydeco: This game determined third place in the tournament.
Larsen erred with 16....Nxe4 overlooking 19.Nxd6, which wins a pawn.
Larsen says, "Strange things always happen in the last round of a tournament."
Portisch says, "As I had won a pawn, the rest should be only a matter of time. But the game decided third place in the tournament, and the tension was too great, and I was too nervous. This can be the only explanation for my spoiling the game. On the other hand it would tend to prove my theory that good and bad luck will approximately equal each other. I had luck in my previous games and was "due" for bad luck."
Portisch should have improved with 26.Bf3 and 29.a4.
If 30.Qg5 Qxg5 31.hxg5 Re1+ 32.Kh2 Re2 with a draw by repetition.
If 32.Qb7 or 32.Qe7, then 32.....e4 and black wins.