optimal play: 14...e5? 15.exf5!
Niess is playing very well.
Browne is in trouble.
22.Qxb7 is good enough, but 22.Be4!! is better.
24.Rf1?! is not so good, instead 24.Qxc7 is much better.
Niess is still looking at an historic victory over Browne but nerves may be starting to get the better of him.
26.Qb2?! is another sub-optimal move.
Niess has allowed the game to slip away.
Niess might still have escaped with a draw by 46.Rxh6 and pushing his h-pawn.
After 13 rounds, going into this game, Walter Browne was the only undefeated player and clear leader on 11½ points.
Gerd Niess was out of the running with 7½ (on which he finished), but it would have been a feather in his cap to be the only player out of the 24 competitors to score a win over such a highly-ranked player as Walter Browne.
He certainly had the opportunity in this game and must have rued his missed chance.
Browne did well to hold his nerve and emerge victorious.
This game was from the 14th round of the 1969 Australian Championship (1968.12.27 to 1969.01.15) played in Melbourne on 14th January 1969.
Browne was the eventual winner with 13/15 [+11/=04/-00]
Niess finished equal 10th on 7½/15 [+06/=03/-06]