Clearance
Clearance is the tactic of removing whatever blocks the path you need for your next move. What gets cleared is usually one of your own pieces, but it can also be an enemy piece you force to move - as in one of the examples on this page. What the departing piece does next rarely matters; the line that opens behind it does, and opening that line often costs material.
It is frequently compared with the discovered attack. Both work the same way: a blocker leaves and a line opens. The emphasis differs. In a discovered attack the moving piece usually makes a threat of its own, while clearance is about paying to open the road for what comes next. The boundary is not sharp, and the same move can reasonably be called either.
The board below is an illustrative position (White to move). The b2-bishop's diagonal toward h8 is jammed by White's own rook on e5, so it can't reach the h8-queen. White's queen on a1 stands behind the bishop on the same diagonal. The key idea: Re8+ is played less for the check than to vacate e5 and open the bishop's path. Whether Black captures with ...Rxe8 or moves the king, the rook leaves e5, and Bxh8 then takes the queen at the far end of the now-open diagonal. The king cannot take back on h8, because the a1-queen now guards that square.
How often does it show up
Of the 212,300 puzzles in this site's database, 3,373 (1.6%) carry the clearance tag, and 51.3% of them sit above rating 1900. For comparison, the pin is 33.6% and the discovered attack is 30.2%. Only 9.4% of clearance puzzles fall below 1200.
One possible reason is the order in which you have to see things, though the rating distribution alone does not establish a cause. With most tactics the target is visible and you look for the move. With clearance the line to the target is blocked, so you have to judge what it is worth before it opens. 34.2% also carry the sacrifice tag and 50.4% are tagged long; these figures only describe co-tags. In individual examples, a blocker may be sacrificed and the payoff may take several moves.
What Clearance Is
A long-range piece (bishop, rook, queen) wants to reach a critical square or line, but a piece (often your own) is in the way. Clearance gets that piece out of the way, even at a material cost, to open the line.
Key: the purpose is the back piece's attack. The moving piece may or may not create a threat of its own; its job is to clear the path.
Comparison with Discovered Attack
| Discovered Attack | Clearance | |
|---|---|---|
| Typical shape | A piece steps aside and the attack behind it is revealed | A blocker is removed to prepare the next move |
| The departing piece | Often creates a threat of its own as well | Often disappears as a sacrifice |
| What gets removed | Your own piece | Your own piece or an enemy one |
The table shows tendencies, not rules: sources label the same move either way.
Why Clearance Gets Missed
- Sacrifice aversion - the moving piece is often captured for free. Giving up a rook so the bishop can mate feels expensive at first.
- Failure to see the square the back piece wants to reach - the decisive square is often far down the line, beyond where you usually look.
- Two-move calculation needed - clearance + decisive blow. Looking only one move ahead, it reads as "I just gave my piece for nothing."
Signs Clearance May Be Available
- A friendly bishop, rook, or queen has a decisive target at the end of its line - mate square, enemy queen, weak point.
- A piece (often your own) blocks that line - without moving it, the line doesn't reach.
- The blocker can move away even if it is captured there - and losing it costs less than what the open line wins.
Example: Queen Sacrifice + Rook Mate
A spectacular clearance pattern (Black to move). The black rook on h5 is aiming at h1, but two pieces stand on the h-file: Black's own queen on h3 and White's h2-pawn. Black throws the queen in with ...Qxg3+, which empties h3, and the instant White recaptures hxg3 the h2-pawn vacates too and the h-file opens - then Rh1#. (If White answers with Rg2 instead, Qxg2# is also mate.) A queen given up for mate.
The queen sacrifice is the means of clearing both blockers off the file; the rook behind them does the damage. (Source: Lichess puzzle 00IUW, CC0)
How to Defend Against Clearance
When the opponent has set up a clearance:
- Move your decisive target (king, queen, weakness) off the line - eliminate the clearance payoff.
- Block the back piece's line with your own piece - restore an obstruction.
- Calculate whether you can decline the sacrificed piece - sometimes refusing the sacrifice neutralizes the clearance entirely.
Checklist
Quick scan for "is clearance available?":
- Is there a decisive target at the end of my bishop, rook, or queen's line?
- Is a piece (often my own) blocking that line?
- Can the blocker move to a sacrifice square that opens the line?
- Sacrifice cost < decisive blow value? (Mate outweighs any material.)
Related Tactics
- Discovered Attack - same "open the line" mechanic, but the moving piece also makes a threat.
- Deflection - another forced-movement tactic, aimed at enemy pieces.
- Attraction - also forced movement, luring enemy pieces.
- Back-Rank Mate - one of the mates an opened line can lead to.
FAQ
Q. Fastest way to distinguish clearance from discovered attack? "Does the moving piece create a new threat?" is the usual dividing question. If it does, the move tends to be called a discovered attack; if it simply pays to open the road, clearance. That is a difference of emphasis rather than a strict rule, and the same move is labelled either way depending on the source.
Q. Is clearance always a sacrifice? Not always. About a third of this site's clearance puzzles (34.2%) also carry the sacrifice tag. The rest do not carry that tag: the blocker can also step aside without being given up, for example with tempo (a check or a threat) so the opponent has no time to close the line again.
Q. An effective way to learn clearance? Start with rook/queen sacrifice → bishop mate puzzles - diagonals are the most visual. Then vertical/horizontal clearance (rook sacrifice → other rook mate). Finally compound clearance (two-step path opening).
Q. Does clearance work for both sides? Yes. You need both the attacking view (creating clearance) and the defensive one (recognizing the opponent's). In particular, when the opponent offers a major piece for free, suspect clearance - before grabbing the "free rook," check the back piece's line.
References
- Lichess, puzzle theme Clearance (the source of this site's puzzle tags). https://lichess.org/training/themes
- Statistics produced by
scripts/analyze-theme-stats.mjs --theme clearance; the run is recorded indocs/data/clearance-stats.md.
On Chess Motif Stats, clearance is tracked as one of 53 separate motifs. Rook-sacrifice clearance, queen-sacrifice clearance, and other variants reappear on an SM-2 spaced-repetition schedule to train recognition of sacrifice + open line + decisive blow.
Start training: Clearance Training
Related: Discovered Attack · Deflection · All tactics