BlunderProof is a 4h 35m ChessMood course about avoiding blunders, and only about a tenth of its listed video is tactics or mating patterns; the rest is mostly attention, emotion and game-day habits. At $300 alone (as of 8 November 2026) it is expensive per hour, and ChessMood's own free article covers much of the same list, so read that first and treat the course as a reasonable add-on only if you already have a ChessMood plan.
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Test depth: Public information only. Nobody at ChessCourseFinder has taken this course. This page is based on published documentation, pricing and reports, read on 8 November 2026. How we review explains the limits.
This review has no star score. Fit, price and limits are set out instead, and how reviews are made is public.
What the seller says is in it
The course page is titled "BlunderProof - Raise your game through the roof!", with GM Avetik Grigoryan as coach. It lists 4h 35m, 82 episodes and 74 puzzles across an introduction, 16 numbered sections and a conclusion, and it promises downloadable slides and a PDF of the rules.
The page gives no publication or update date. The oldest dated student review embedded in it is from 3 August 2022, so the course is at least that old.
Its "what you'll learn" list includes the reasons behind blunders, how to notice the opponent's threats, how to avoid impulsive moves and "How to reduce the blunders up to 10 times?". The sales text also asks whether your rating might be 200 or 300 points higher without blunders. Those are the seller's framing. Nothing on the page shows how either figure was measured, and we repeat them only so you can discount them.
Where the 4h 35m actually goes
The section timings show this is mainly a mindset course. The groups below are ours; the timings and puzzle counts are ChessMood's, and the shares are calculated from them and rounded (274m 44s in total).
| What the sections deal with | Sections | Listed video | Share | Puzzles |
|---|---|---|---|---|
| Focus and emotion | Hyperfocused Mode, Dealing with pressure, Relax at the end ONLY, Keep the mood | 1h 20m 38s | 29% | 21 |
| Attention to the opponent and to your own move | You have an opponent, Impulsive moves, Underestimation, Overtrust, Unalertness | 1h 17m 22s | 28% | 29 |
| Preparation and energy | Play more, Warm-Up, Stamina matters | 36m 20s | 13% | 3 |
| Defining blunders (the free introduction) | Introduction | 30m 42s | 11% | 1 |
| Chess skill | Sharpen your tactical skills, Study mating patterns | 27m 49s | 10% | 17 |
| Afterwards | Analyze and weed out blunders, 5-step recovery method, Conclusion | 21m 53s | 8% | 3 |
The longest single section is "Keep the mood" at 42m 54s, which is about carrying on well after something has gone wrong. If you already know you tilt after a mistake, that is a point in the course's favour. If your blunders happen in calm positions, it is a lot of time on a problem you do not have.
Syllabus check: what a blunder course should give you
A useful blunder course should do five things. The lesson list, which is visible even though most lessons are locked, gives a mixed picture.
Define the problem. It does. The introduction has lessons on the difference between a blunder and a mistake, and on how Chess.com and Lichess labels "can confuse you". All of that is unlocked.
Explain the causes. This is the course's real strength on paper: impulsiveness, underestimation, overtrust, losing concentration in the opening, in the endgame and in strategic positions, and tiredness late in games or tournaments each get their own treatment.
Give you a check to run before moving. This is the weakest part of the listing. Only two lesson titles name a technique: The "double/triple check" technique (2m 1s) and "Soviet Union's chess school technique" (2m 22s), both in the Impulsive moves section. "How to notice opponent's threats" is promised, and "When you ignore your opponent" runs 6m 10s, but no title shows a step-by-step routine for every move. We cannot see inside locked lessons, so the routine may be there under another title. A common coaching habit is to ask, before each move, what the opponent's last move threatens and what your move leaves undefended. That is received wisdom rather than a measured result, and it is the thing to look for here.
Train the habit. There are 74 puzzles, of which 32 sit in just two sections (Keep the mood and Unalertness, 16 each). The page does not say whether they test spotting danger in quiet positions or finding the right move in sharp ones.
Fix the skill gaps behind tactical blunders. Two short sections touch this, and each ends with a very short "solution" lesson (1m 32s and 1m 8s). We cannot see what those lessons recommend. If tactical blunders are your problem, the skill courses are separate purchases: at single-course prices Tactic Ninja is $600 and Mating Matador $350.
The free resource that covers similar ground
Start with ChessMood's own free article, 16 practical tips to stop blundering, written by GM Grigoryan and marked as updated on 20 June 2026. The author says it summarizes many of the course's concepts, and the overlap is close.
Its tips run through playing more games, warming up, a "hyper-focussed mode" with five tips whose names match the five lessons in the course's third section, calming down under stress, relaxing only after the game ends, keeping the right mood, sharpening tactics, studying mating patterns, watching the opponent's threats, double-checking critical moves, not underestimating or trusting your opponent, stamina, and not relaxing in the opening, dull middlegames or the endgame.
So what would the $300 add? Going by the listing: many more game examples for each cause, the quizzes and 74 puzzles, the downloads, a 7m 32s lesson on how to analyze correctly, and the five-step recovery routine. (The article page also shows a piece titled "Blundered? Bounce back with this 5-step Grandmaster method!", which we did not open.)
Beyond the article, Lichess is free with no paid tier, and our guide to Lichess studies and practice covers the puzzle and practice side. What you give up is a structured set of explanations from a named grandmaster.
A ten-game check before you spend anything
Your own losses will tell you more than the syllabus will. This is our suggested method, not a validated test:
- Take your last ten lost games, and find the move that swung each one.
- Mark it as one of these: I did not see the threat; I saw nothing because I do not know the pattern; I saw it but moved too fast; I was tired or short of time; I had already lost my composure.
- Count the marks.
If most are the second kind, you need tactics, not this course. The first kind sits between the two, because some threats are simply patterns you have not learned. The last three kinds are where BlunderProof's sections are aimed.
The 800-2700 label
The page states 800-2700 without naming a rating system. That is a 1,900-point span; see our ChessMood review for the wider library. Nothing in the section or lesson list is split by level, so treat the label as broad guidance. A stronger player may still find the mental-habits material useful, but the page does not show what would differ between a 900 and a 2200.
Price
The page shows $300 to buy this course alone, as of 8 November 2026, with no sale price seen. Calculated from listed figures, $300 over 4.58 hours is about $65 per listed video hour, the highest of the ChessMood course pages we read that day (Tactic Ninja works out at about $31).
If you would also want the two skill courses above, the single-course total is $300 + $600 + $350 = $1,250, which is the number to compare against the plans on our ChessMood pricing page. ChessMood's refund policy is written about membership plans and does not mention single-course purchases, so ask before buying this one alone.
Who it suits
It suits a player who already knows the basic tactics, whose losses come from rushing, losing concentration or falling apart after a mistake, and who likes learning through a coach's own stories and examples. It makes most sense if you already have a ChessMood plan and the extra cost is nil.
Who should skip it
- You miss tactics because you do not yet recognise the patterns. The larger Tactic Ninja is the tactics course on the same site.
- You want to pay for one thing only. $300 for 4h 35m is hard to justify standalone when the free article covers so much of the outline.
- You want a concrete thinking routine as the main deliverable. The titles do not show one.
- You are unlikely to change how you play. A common coaching view is that a checking habit only helps if it is used in games; that is received wisdom, not a measured result.
The better-documented alternative
Inside ChessMood, the Tactic Ninja page publishes far more training material (2,475 puzzles and 29 sections). Mating Matador lists 37 mating patterns, 5h 48m, 556 puzzles and $350 alone, at a stated 1200-2200, and the seller says to watch Tactic Ninja first.
For courses from other sellers, see best blunder prevention courses. If you are comparing subscriptions rather than courses, see ChessMood vs Chessly.
What the seller's pages do not tell you
- The free preview shows the definitions, not the method. The page unlocks only the Introduction (9 lessons, 1 puzzle, 30m 42s), the fewest puzzles of the ChessMood course pages we read. You can judge the teaching style from it, but none of the numbered sections are open.
- How "10 times fewer blunders" was worked out. No method or sample is given.
- How critical the reviews really are. Of the 165 student reviews embedded on the page, 164 give five stars and one gives four. They are posted on ChessMood's own site, so they cannot tell you how the course compares with free material.
- No update date and no named rating system for 800-2700.
- Standalone access length and per-course refund terms were not on the page.
Original test pending
We have not taken BlunderProof. A real test would record whether the locked lessons contain a usable checking routine, whether the 74 puzzles train it, how much the course adds beyond the free article, whether it differs usefully for a 900 and a 2000 player, and when it was last updated. This page reports none of that.