Courses and Habits to Stop Hanging Pieces

To stop blundering, build a free pre-move check before you buy anything. Coaches commonly treat hanging pieces as a habit problem, though the effect of that habit is received wisdom rather than a measured result. If you want a taught course on top, the best-documented one is ChessMood's BlunderProof at $300 alone (as of 8 November 2026), and it makes sense only if you will also use the ChessMood library or your errors come from pressure and focus.

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Test depth: Public information only. Nobody at ChessCourseFinder has taken this course or used these tools. This page uses seller pages read on 8 November 2026. How we review explains the limits. This page is part of our skills guides.

What a blunder is, and whether it is your problem

Blunder prevention covers moves that give away material or allow a mate in one or two moves. Missing a deeper tactic of your own is tactics or calculation. Coach Nate Solon describes a blunder as a move the player could easily recognise as a mistake under normal circumstances, which makes it a lapse rather than a gap in knowledge (Solon, April 2024). Do not take an engine's "blunder" label as a diagnosis: BlunderProof's free introduction includes lessons titled "How chess.com can confuse you" and "How Lichess can confuse you" (page).

Score your last 20 games

This tally is a conventional coaching exercise, and the 50% line is our rule of thumb. For each game you lost or threw away, find the move that decided it and give it one letter:

If A and B make up half or more of the list, this page is for you. Keep the sheet, because you will repeat the count later.

Small changes can matter here. Solon's point is that you need to blunder less often, not never. Using Solon's example of a 40-move game, one blunder a game is 1 in 40 moves, or 2.5%. Halving that to one blunder every two games is 1 in 80, or 1.25%. The percentage looks tiny, but it is one decisive error fewer every second game.

A free habit first (conventional advice)

Coaches commonly teach a short check before every move. A version of it:

1. What did my opponent's last move change, and what does it threaten?
2. Is the piece I am about to move needed to defend something?
3. After my move, can the opponent capture anything, give check, or make a threat?
4. Is the square I am moving to attacked?

ChessFox teaches a shorter form free of charge, with two questions on every move: what is my opponent threatening, and what are the downsides of my intended move (ChessFox lesson). This is all received coaching wisdom, not a result we can cite from research. ChessFox's study plan makes a related general point: "Nobody can completely eliminate mistakes but strong players rarely blunder" (ChessFox study plan).

A worked example. After 1.e4 e5 2.Bc4 Nc6 3.Qh5, the developing move 3...Nf6 attacks the queen and looks healthy. Question 1 catches the problem: White's queen and bishop now both aim at f7, and 3...Nf6 does nothing about it, so 4.Qxf7 is checkmate. Either 3...g6, which blocks the queen's path and attacks it, or 3...Qe7, which guards f7, answers the threat.

What the check costs on the clock. Assume five seconds a move over 40 moves: that is 200 seconds. In a 10-minute game (600 seconds), the check uses a third of your time. In 3-minute blitz (180 seconds), it is more than your whole clock. So practise it in games of about 15 minutes or longer. Perrine argues that the process gets faster with repetition, which is a coach's opinion, not a measurement.

One old tip to avoid: writing your move on the scoresheet before playing it. Solon notes that FIDE rules prohibit this, and suggests picturing the intended move on the board and checking it there instead.

Training away from the board

The ideas below come from two coaches. They are opinion, and neither gives measured results.

• Flip the board. Dalton Perrine suggests solving tactics from the defending side, so you practise looking for your opponent's strong moves (Perrine, December 2025). Perrine sells a Chessable course on this subject, so the article is also promotion.
• Keep the puzzles easy and about loose pieces. Perrine's reasoning is that the goal is repetition of a scan, not struggle. Lichess has free themes for this: "Hanging piece" (256,252 puzzles) and "Defensive move" (386,822), as shown on its themes page on 8 November 2026.
• Back up one move. After solving a tactic, find the move that allowed it, then find a safer alternative.
• Train stamina occasionally. Solon says fatigue is hard to test as a cause, but suggests the odd long, hard solving session.

We read no controlled study of blunder checks. The closest finding is Roediger and Karpicke (2006): students who were tested on prose passages retained more after two days and a week than students who restudied them, even though restudying raised confidence (Crossref record). That concerns remembering text, not noticing threats under a clock, so it says nothing direct about blunders. At most, it is a reason not to assume that watching an explanation is enough.

A sensible order

This order is coaching convention, not a tested programme.

1. Tally 20 games.
2. Run the check in every game of 15 minutes or longer for two weeks.
3. Add five to ten minutes a day of easy hanging-piece puzzles, from the defender's side.
4. Tally your next 20 games the same way.
5. Decide. If A and B have shrunk, keep going for free. If D or E now dominate, a course on focus may fit. If C dominates, move to calculation.

What to buy, by level

Levels are approximate.

• Under about 1200: the habit above plus free tactics practice; coaches commonly suggest trying that before buying anything.
• About 1200 to 1800: BlunderProof is a reasonable add-on if you also want the psychology material and are paying for ChessMood anyway.
• Above about 1800: game review matters more; see game review tools.

The best-documented options

Sources: ChessMood pricing, Aimchess, Aimchess App Store listing, Lichess FAQ, Chess.com membership comparison. The two Aimchess price sets conflict. Its site does not say whether Blunder Preventer is among its "core" or "Premium" lessons.

Two coaches also name Chessable courses on this topic. Solon lists Mastering Defensive Techniques (Susan Polgar, beginner), Survive & Thrive (Perrine, intermediate) and Recognizing Your Opponent's Resources (Mark Dvoretsky, very hard). Perrine lists Survive & Thrive, Perrine's own course, plus My Opponent's Threats: Piece Safety Training (jdac) and Preventing Blunders in Chess (Can Kabadayi). We did not confirm their prices or levels on Chessable, so confirm both before buying.

BlunderProof

The coach is GM Avetik Grigoryan, per the page. ChessMood's intermediate study-plan page says "there are lots of psychological factors which will affect your tactical vision" (study plan), and the course follows that view. Its section times show where the 4h 35m goes. The groupings are ours, from the section titles:

Downsides:

• $300 alone works out to about $65 per listed video hour (calculated from 4h 35m), and about $4.05 per listed puzzle. Listed hours are not study time.
• Thirty-two of the 74 puzzles sit in two sections (6 and 13), and sections 1, 2, 4 and 16 list none.
• The free preview is the 30m 42s introduction only (9 lessons, 1 puzzle), so you cannot see the main method, or the five-step recovery in section 16, before paying.
• No update date is shown. See our BlunderProof review.

ChessMood's refund policy gives 30 days from the first payment on a first subscription, and speaks only of membership plans. If you would buy the $300 course on its own, ask about refunds first.

Blunder Alert!

Calculated from $5 and 20 exercises, this is $0.25 an exercise. Downsides: 20 positions is a short set; ChessFox's claim that its technique can "significantly reduce" blunders is unmeasured; and the method itself is already free on the same page, so you would be paying only for extra practice positions. We saw no refund terms there.

What the seller's pages do not tell you

The BlunderProof page shows section titles and times but does not show the content of any section after the introduction, so its method for spotting threats cannot be judged in advance. ChessMood's tactics course Tactic Ninja lists "counter-tactics", so some topic overlap is possible, but we have not compared the two syllabi.

Who should skip this

Skip it if you are under about 1200 (use the habit and free puzzles), if your tally shows mostly time-pressure errors (a time-management problem), or if you would pay $300 for one topic. A subscription makes sense only if you will use other courses; see how to choose a chess course.

The free resource that covers the same ground

Lichess computer analysis and puzzles are free (Lichess FAQ), and the Lichess guide explains how to use them. Run your own losses through analysis, and use a puzzle trainer for volume. For seeing the board without moving pieces, see visualization.

If you want to see BlunderProof's introduction first, ChessMood's free Basic plan is the route.