A black queen that has penetrated into white's territory (ranks 1–4), operating with limited immediate opposition.
SAE concept sae_20408 fires when a black queen that has penetrated into white's territory (ranks 1–4), operating with limited immediate opposition.. It appears in 688 of 9,950 Climbchess puzzles (6.9%), spanning ELO 643–2689 (median 1561).
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This page documents A black queen that has penetrated into white's…, 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 black queen that has penetrated into white's territory (ranks 1–4), operating with limited immediate opposition.
This pattern fires in 688 of our 9,950 tagged puzzles. The puzzles where it appears span ELO 643 to 2689, with a median rating of 1561. That distribution tells you whether this is a beginner cue or a master-level subtlety.
Pattern statistics
| Concept ID | sae_20408 |
|---|---|
| Puzzles where it fires | 688 |
| Min ELO | 643 |
| Median ELO | 1561 |
| Max ELO | 2689 |
| Coverage | 6.91% 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 zvn0d — ELO 643, themes: backRankMate, endgame, mate, side to move: White
- Puzzle zykWh_F — ELO 900, themes: advantage, fork, middlegame, side to move: Black
- Puzzle zqnp4 — ELO 1111, themes: backRankMate, endgame, long, side to move: Black
- Puzzle zz1bb — ELO 1229, themes: advancedPawn, advantage, fork, side to move: Black
- Puzzle zwmwL_F — ELO 1403, themes: crushing, kingsideAttack, middlegame, side to move: Black
- Puzzle zxM4N_F — ELO 1561, themes: advantage, endgame, fork, side to move: White
- Puzzle r87rv_F — ELO 1800, themes: long, mate, mateIn3, side to move: White
- Puzzle 01Yo5_M — ELO 1978, themes: advantage, long, middlegame, side to move: White
- Puzzle zvEBG_F — ELO 2143, themes: advantage, clearance, fork, side to move: Black
- Puzzle zzWbh — ELO 2393, themes: crushing, fork, long, 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_20408?
A black queen that has penetrated into white's territory (ranks 1–4), operating with limited immediate opposition. 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 688 tagged puzzles (6.9% of the set), spanning Lichess ELO 643 to 2689 with a median of 1561.
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.