A square is attacked by at least 3 white pieces and at most 1 black piece, and the square is empty.
SAE concept sae_3452 fires when a square is attacked by at least 3 white pieces and at most 1 black piece, and the square is empty.. It appears in 42 of 9,950 Climbchess puzzles (0.4%), spanning ELO 734–2480 (median 1290).
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This page documents A square is attacked by at least 3 white pieces…, one of 4,505 interpretable chess concepts extracted from Leela Chess Zero via sparse autoencoders. The full feature description from our SAE labelling pipeline reads:
A square is attacked by at least 3 white pieces and at most 1 black piece, and the square is empty.
This pattern fires in 42 of our 9,950 tagged puzzles. The puzzles where it appears span ELO 734 to 2480, with a median rating of 1290. That distribution tells you whether this is a beginner cue or a master-level subtlety.
Pattern statistics
| Concept ID | sae_3452 |
|---|---|
| Puzzles where it fires | 42 |
| Min ELO | 734 |
| Median ELO | 1290 |
| Max ELO | 2480 |
| Coverage | 0.42% of puzzle set |
Related concepts
The five concepts most often co-firing alongside this one (Jaccard similarity over the puzzle co-occurrence graph) are:
Example puzzles
Below are 10 puzzles spanning the rating distribution. Each links to its own page with full move list and related concepts.
- Puzzle zfPbz — ELO 734, themes: mate, mateIn1, middlegame, side to move: Black
- Puzzle 011ON_F — ELO 793, themes: crushing, endgame, fork, side to move: Black
- Puzzle znXLk — ELO 831, themes: crushing, deflection, endgame, side to move: White
- Puzzle 00FH6 — ELO 986, themes: mate, mateIn1, middlegame, side to move: White
- Puzzle zGRe5_F — ELO 1007, themes: crushing, endgame, short, side to move: White
- Puzzle zu0eu — ELO 1290, themes: crushing, deflection, endgame, side to move: Black
- Puzzle zhsq7_F — ELO 1325, themes: anastasiaMate, endgame, kingsideAttack, side to move: White
- Puzzle zy2iq — ELO 1853, themes: crushing, endgame, exposedKing, side to move: White
- Puzzle znieJ — ELO 2277, themes: crushing, endgame, exposedKing, side to move: White
- Puzzle 4BqOI — ELO 2448, themes: arabianMate, endgame, exposedKing, side to move: White
How to use this page
If you want to train this pattern, open the Climbchess trainer and filter for puzzles tagged with this concept. The trainer surfaces them at the right difficulty for your current rating, and tracks how often you spot the cue versus miss it. You can also browse the related concepts above to see neighbouring ideas in feature space.
Climbchess concepts are not heuristics written by a human author. Each one corresponds to a single direction in the residual stream of Leela Chess Zero that activates on a specific board feature, then was labelled by reading the top-activating positions. This makes the catalogue exhaustive (every Leela-detectable pattern is in here somewhere) and falsifiable (you can replay our extraction).
Frequently asked
What is SAE concept sae_3452?
A square is attacked by at least 3 white pieces and at most 1 black piece, and the square is empty. It is one of 4,505 interpretable features extracted from Leela Chess Zero's residual stream via sparse autoencoders, then labelled by reading the top-activating positions.
Where does this pattern appear?
In 42 tagged puzzles (0.4% of the set), spanning Lichess ELO 734 to 2480 with a median of 1290.
How do I train it?
Open the Climbchess trainer and filter for puzzles tagged with this concept. The trainer adapts difficulty using your live recognition profile and tracks how often you spot the cue versus miss it.
Is it free?
Yes. Climbchess is free forever, with no account, email, or signup required. You can delete your data at any time.