2026 Chess Candidates Round 4

2026 Candidates Tournament – Round 4

Sindarov takes a historic lead; the chase begins

Previous post (methodology & round 3): Tracking Candidates with a pure in‑tournament model

Quick methodology refresher

This model uses only in‑tournament results – every player starts with a neutral 2800 TPR (in‑tournament performance rating). After each round, we update ratings using Bayesian shrinkage (to avoid over‑reaction), then run 100,000 Monte Carlo simulations of the remaining games with draw‑adjusted probabilities from historical Candidates data (2013–2024).

Key metrics in the table:

• TPR – Bayesian in‑tournament performance rating (posterior mean).
• SoSIG – average forecasted TPR of opponents not yet played (higher = tougher remaining schedule).
• P(≥8.5) – probability of reaching the historical winning threshold, derived from simulations.
• Win Prob – probability of finishing first (including tiebreaks), from simulations.
• TMRFE – composite 0–100 “feel” score blending points, TPR, SoSIG, games left, and a naive projection (weights from machine learning on historical Candidates).
• Historical deficit rule – from 2013 to 2024, the eventual winner was never 1.0 or more points behind the leader at any stage. We are testing this rule live in 2026 – players who fall into that zone are flagged as “historically unlikely”, but we are watching to see if the pattern holds.

With 4 rounds, the model is still stabilising, but it becomes progressively stronger after round 6. By round 7, confidence levels are very high.

Round 4 – Sindarov takes the lead

Sindarov defeated Caruana in their top‑of‑the‑table clash, reaching 3.5 points out of 4 – a score no player in any Candidates from 2013 to 2024 has ever achieved after 4 rounds (the previous best was 3.0).

Other results:

• Giri beat Esipenko
• Blübaum drew Pragg
• Nakamura drew Wei Yi

Points after round 4:

• Sindarov 3.5
• Caruana 2.5
• Blübaum, Pragg, Giri 2.0
• Nakamura, Wei Yi 1.5
• Esipenko 1.0

What the model sees now

• Historical deficit rule (test) – Caruana is now 1.0 point behind the leader; the others are 1.5, 2.0, or 2.5 behind. In all previous Candidates, the winner never trailed by 1.0 or more at any stage. This is the first time in 2026 that a player has fallen exactly to that threshold. We will watch whether Caruana or anyone else can defy the historical pattern.
• Unprecedented start – No previous winner ever had 3.5 points after 4 rounds. Sindarov’s start is statistically the strongest in the last 12 years of Candidates history. The tournament now faces an unusual dynamic: the rest of the field must take risks to catch him, which could either let him extend his lead or create opportunities for a dramatic comeback.
• Monte Carlo simulation (100,000 runs) gives Sindarov an 82% chance to reach 8.5 points and a 75% win probability. All other players have win probabilities below 15%.

The tournament is not mathematically over – there are 10 rounds left, and any player could theoretically win all remaining games. But the model’s metrics, grounded in a decade of Candidates history, now point to a single dominant front‑runner. The coming rounds could turn into a “bloodbath” as everyone tries to chase Sindarov – a scenario we haven’t seen in the Candidates for years. We will continue tracking round by round to see if Sindarov can maintain this historic pace or if someone can break the historical deficit pattern.

Round 4 prediction table

Rank	Player	Elo	TPR	Pts	Deficit	SoSIG	P(≥8.5)	Win Prob	TMRFE	Early Outlook
1	Javokhir Sindarov	2745	2850	3.5	0.0	2760	82%	75%	87	🟢 Strong starter
2	Fabiano Caruana	2795	2686	2.5	1.0	2790	38%	12%	68	⚠️ Slow starter
3	Matthias Blübaum	2698	2914	2.0	1.5	2740	26%	4%	57	🟢 Strong starter
4	R Praggnanandhaa	2741	2775	2.0	1.5	2760	24%	3%	55	⚠️ Slow starter
5	Anish Giri	2753	2850	2.0	1.5	2770	22%	2%	53	🟡 Solid start
6	Hikaru Nakamura	2810	2686	1.5	2.0	2840	16%	1%	48	⚠️ Slow starter
7	Wei Yi	2754	2914	1.5	2.0	2760	14%	0%	46	🟡 Solid start
8	Andrey Esipenko	2698	2686	1.0	2.5	2830	8%	0%	40	⚠️ Slow starter

2026 Candidates Tournament · Round 4 Update
Model updates after every round. All players remain mathematically alive (10 rounds left). Next update after round 5.