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White’s position is bleak and approaching zugzwang as none of her pieces can move without material loss.

One of his best games came against New Jersey GM Brandon Jacobson in Round 5, tying up his opponent with a neat positional zugzwang out of an unconventional King’s Indian set-up.

He likened his dilemma to a "zugzwang" - the position where a player in chess or draughts faces only bad moves.

"There's this position on the board called 'zugzwang' which means there's no good move to make ... and that's what we had yesterday, a zugzwang," he told Reuters.

He could still draw a pawn down until another blunder enabled Grischuk to create zugzwang, compulsion for the opponent to make a losing move, then launch a winning advance to queen.