The sixth round of the Lake Sevan Tournament 2015 witnessed one of the rarest of occurrences as GM Vidit Gujrathi, rated 2643, dramatically allowed a mate in 1 against GM Hovhannisyan. After playing the opening quite strongly, Vidit was already ruling the roost by move 20. However, that was when the disaster struck. Vidit, after thinking for 5 minutes, moved his Rook to h3 from h1 and in the process, completely overlooked a mate-in-1 with Qf1. Hovhannisyan promptly played the mating move, thus clinching the game.
The other decisive game of the day saw GM Duda Jan Kryzystof overcome GM Salem A. R. Saleh with the black pieces. With this win, Duda has taken up the sole lead after Round 6. The young Polish GM is being closely followed by GMs Anton David Guijarro and Ter-Sahakyan on the 2nd and 3rd spots respectively.