Reckless Engine Shatters Computer Chess Duopoly, Faces Stockfish in TCEC Superfinal

For years, the elite realm of computer chess has been defined by a familiar rivalry: Stockfish versus Leela Chess Zero (Lc0). However, in a dramatic and unexpected turn, this long-standing duopoly has finally been broken.

For the first time in many seasons, the prestigious Top Chess Engine Championship (TCEC) Superfinal will not feature the anticipated clash between these two giants. Instead, a formidable new challenger, Reckless, has burst onto the scene, securing its place in a highly anticipated final against the reigning champion, Stockfish.

The Premier Division of the TCEC proved to be an enthralling spectacle for chess enthusiasts. Expectations were high for newcomers like Torch, and others such as Obsidian and Berserk were also in the mix, all vying to disrupt the traditional Superfinal lineup. Many wondered if Lc0 would simply brush aside all challengers as it had in previous seasons. However, it was Reckless that truly stole the show, blindsiding its competitors and convincingly claiming the second qualifying spot for the Superfinal alongside Stockfish.

The final standings from the Premier Division underscore this historic shift:

• 1st: Stockfish – 35 points (Qualifies for Superfinal)
• 2nd: Reckless – 34 points (Qualifies for Superfinal)
• 3rd: Leela Chess Zero – 31 points
• 4th: PlentyChess – 27 points
• 5th: Torch – 27 points
• 6th: Integral – 26 points
• 7th: Obsidian – 23 points
• 8th: Berserk – 21 points

This significant breakthrough prompts larger questions about the future trajectory of computer chess. Is this a singular anomaly, or does it signal the dawn of a broader transformation? Can rising stars like Reckless consistently challenge and dethrone the established elite?

One certainty remains: after years of predictable outcomes at the pinnacle of competition, the Top Chess Engine Championship has once again become thrillingly unpredictable. The entire chess world is now watching with bated breath.

About the Reckless Chess Engine

True to its name, Reckless demonstrated an exceptionally aggressive playing style throughout the Premier Division of TCEC. Its bold strategy led to impressive victories, securing 14 game pairs against various opponents, including a win against Leela Chess Zero itself.

Reckless is the brainchild of Arseniy Surkov, developed in collaboration with Peregrine and Styx. Its journey in the Top Chess Engine Championship began modestly in August 2024, finishing 22nd in TCEC Swiss 8. However, its ascent has been nothing short of meteoric. By TCEC Swiss 9, Reckless had climbed to 8th place, and in just a few months, it amassed sufficient Elo to earn a coveted spot in the TCEC Superfinal by finishing silver in the Premier Division.

Today, Reckless stands as a formidable, Rust-powered engine, legitimately contending for a top position in the 2026 engine hierarchy. The earlier mini-match between Reckless and Stockfish in the Premier Division, which concluded with a narrow 4.5-3.5 victory for the reigning champion, sets the stage for what promises to be a fantastic and utterly unpredictable Superfinal.