This feature detects squares that are attacked by White and either undefended or defended by fewer Black pieces, often in the center or near the Black king.
SAE concept sae_40465 fires when this feature detects squares that are attacked by White and either undefended or defended by fewer Black pieces, often in the center or near the Black king.. It appears in 233 of 9,950 Climbchess puzzles (2.3%), spanning ELO 618–2572 (median 1071).
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This page documents This feature detects squares that are attacked…, 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:
This feature detects squares that are attacked by White and either undefended or defended by fewer Black pieces, often in the center or near the Black king.
This pattern fires in 233 of our 9,950 tagged puzzles. The puzzles where it appears span ELO 618 to 2572, with a median rating of 1071. That distribution tells you whether this is a beginner cue or a master-level subtlety.
Pattern statistics
| Concept ID | sae_40465 |
|---|---|
| Puzzles where it fires | 233 |
| Min ELO | 618 |
| Median ELO | 1071 |
| Max ELO | 2572 |
| Coverage | 2.34% 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 yZzjp_M — ELO 618, themes: arabianMate, endgame, mate, side to move: White
- Puzzle 00ghH_M — ELO 730, themes: endgame, mate, mateIn2, side to move: White
- Puzzle zzPHE_F — ELO 812, themes: endgame, mate, mateIn2, side to move: White
- Puzzle zzr49_M — ELO 896, themes: kingsideAttack, mate, mateIn2, side to move: White
- Puzzle zzVyL_M — ELO 948, themes: crushing, endgame, fork, side to move: Black
- Puzzle zyw8s_M — ELO 1071, themes: kingsideAttack, mate, mateIn2, side to move: White
- Puzzle zzJBX — ELO 1202, themes: crushing, endgame, master, side to move: White
- Puzzle 028i6_F — ELO 1351, themes: capturingDefender, crushing, middlegame, side to move: Black
- Puzzle zreY4_M — ELO 1612, themes: hangingPiece, mate, mateIn1, side to move: Black
- Puzzle zpSea_F — ELO 1868, themes: advantage, endgame, interference, 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_40465?
This feature detects squares that are attacked by White and either undefended or defended by fewer Black pieces, often in the center or near the Black king. 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 233 tagged puzzles (2.3% of the set), spanning Lichess ELO 618 to 2572 with a median of 1071.
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.