England's David Howell, and American top Junior Jeffrey Xiong continue to lead the A tournament, now standing on 3/5, with one win apiece. In the the B tournament, Surya Ganguly's pace slowed, allowing Grigoriy Oparin to catch up with both scoring 3½ points, while in the C tournament, the Latvian Arturs Neiksans also remains in the lead with 3½.
In Friday's fourth round only two of the nine games were decided. The A tournament saw a draw between the English GMs David Howell and Gawain Jones but it was by no means a boring one:
Converting a position with a healthy extra pawn makes every chess player rejoice but the realization of small advantages like this often turns out to be extremely difficult or even fails completely. Sam Shankland had to work hard for 72 moves in the fifth round, before finally being able to score the full point in his pawn up endgame.
Gawain Jones was looking forward to seeing the city on Sunday's rest day, after his first five games were all "somehow" drawn:
Three more fighting games but somehow all draws for me at the halfway point at the #SummerClassic @STLChessClub Day off tomorrow to explore St Louis. Let's hope for no more thunderstorms.
— Gawain Jones (@GMGawain) 23. Juni 2019
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Round four's lone winner was the young Russian Grigoriy Oparin, who knocked off Igor Kovalenko, with the black pieces, to move into shared first place. But Oparin first dodged a bullet in the middlegame after 28...♞h5?
This was the moment for White to strike with 28.♕e5+ ♚g8 29.♔f1 when White's king is safe and his piece activity will force the queens off into an easily winning endgame. Instead, 28.♕d2 gave Oparin the compensation for the pawn he needed: 29...♞f4 30.♖g3 d3 and Black's initiative led Kovalenko to jettison an exchange a few moves later giving Oparin a technically winning game.
All games of the 5th round ended in draws, so nothing changed.
In the C tournament, Neiksan's lead has melted to half a point.
Translation from German and additional reporting: Macauley Peterson