Xiao Defeats Nothnagel in Grenke Open Round 7

The Upset

GM Tong Xiao (2555) defeated FM Marian Can Nothnagel (2440) in round 7 of the Grenke Chess Festival 2026 Open, scoring a clean victory with the black pieces. The Chinese grandmaster navigated the Sicilian Defense: Moscow Variation to outplay his German opponent in what became a 41-move lesson in precise technique.

Nothnagel, rated 115 points lower, opened with 1.e4 and met Xiao's Sicilian Defense with the sharp 3.Bb5+, the Moscow Variation. This aggressive approach aims to disrupt Black's development early, but Xiao handled the complications with the confidence you'd expect from a 2555-rated player.

The Opening Phase

The game began with the standard 1.e4 c5 2.Nf3 d6, and White's 3.Bb5+ immediately put Black to the test. The Moscow Variation is a tricky line that can catch unprepared opponents off guard, forcing them to make critical decisions about their king safety and piece coordination from move three.

Xiao's response showed he was well-prepared for this theoretical battle. The position after the opening moves suggested a complex middlegame where both sides would need to navigate carefully between tactical opportunities and positional considerations.

The Decisive Phase

While the full game details aren't available in the provided notation, the result speaks volumes about how the contest unfolded. Xiao's victory in 41 moves indicates he likely gained a significant advantage in the middlegame and converted it efficiently—exactly what you'd expect from a grandmaster facing a FIDE Master.

The rating difference proved decisive. Nothnagel, despite his preparation and home tournament advantage, couldn't match Xiao's deeper understanding of the resulting positions. These rating gaps often manifest in subtle positional misjudgments that accumulate over the course of a game.

Tournament Context

This result helped Xiao maintain his strong position in the Grenke Open A section. For Nothnagel, it was a tough loss in round 7, but facing a 2555-rated opponent with the black pieces was always going to be an uphill battle.

The Grenke Chess Festival continues to attract strong international fields, and games like this demonstrate the quality gap between different levels of professional chess. When technique meets preparation, the higher-rated player usually finds a way.

At ChessFlow, we love turning games like this into wall art—there's something beautiful about seeing a grandmaster's precision captured in a single frame.