Anna Zatonskih and Irina Krush were tied at the end of the U.S. Women's Championship round-robin, so today they played a tiebreaker. It would go to an Armageddon game if necessary, but first they played a pair of G/25 (plus 5 second increments per move) rapid games. In the first, Zatonskih got nothing with White, pressed anyway, and lost. In the rematch, however, she played very well and obtained a winning attack. To break the attack, Krush offered an exchange, but Zatonskih went for more. Krush's reply was a blunder, and with a simple two-mover her opponent would win a rook, equalize the scores, and go on to the Armageddon game.
Instead, after thinking for three minutes, Zatonskih missed it. By this point Krush had seen it and could be seen exhaling in relief, though even after this her position was awful. Zatonskih didn't handle the technical task to perfection, but was slowly but surely getting the job done. And then...she simply hung a rook. Maybe it was the sort of OTB equivalent of "pre-move": she expected that Krush was going to do something else, and simply carried out her intended move anyway, not noticing before reflexively executing what was now a blunder.
A horrific reminder, in case anyone needed it, that errare humanum est.