A black bishop defended by at least one black piece, not attacked by white, on any square.
SAE concept sae_1856 fires when a black bishop defended by at least one black piece, not attacked by white, on any square.. It appears in 251 of 9,950 Climbchess puzzles (2.5%), spanning ELO 721–2683 (median 1646).
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This page documents A black bishop defended by at least one black…, 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 bishop defended by at least one black piece, not attacked by white, on any square.
This pattern fires in 251 of our 9,950 tagged puzzles. The puzzles where it appears span ELO 721 to 2683, with a median rating of 1646. That distribution tells you whether this is a beginner cue or a master-level subtlety.
Pattern statistics
| Concept ID | sae_1856 |
|---|---|
| Puzzles where it fires | 251 |
| Min ELO | 721 |
| Median ELO | 1646 |
| Max ELO | 2683 |
| Coverage | 2.52% 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 zyDSP — ELO 721, themes: backRankMate, mate, mateIn1, side to move: Black
- Puzzle 00nlD_F — ELO 940, themes: master, mate, mateIn1, side to move: Black
- Puzzle zyIZH_F — ELO 1055, themes: endgame, long, mate, side to move: White
- Puzzle zz0Qh_F — ELO 1410, themes: crushing, fork, middlegame, side to move: White
- Puzzle zlnTw_M — ELO 1509, themes: advantage, middlegame, short, side to move: Black
- Puzzle zrenI_M — ELO 1646, themes: attraction, crushing, fork, side to move: Black
- Puzzle 021Au — ELO 1856, themes: advantage, discoveredAttack, master, side to move: Black
- Puzzle JfX9g_M — ELO 2074, themes: kingsideAttack, mate, mateIn2, side to move: Black
- Puzzle zAkVB_F — ELO 2197, themes: advantage, attraction, kingsideAttack, side to move: White
- Puzzle ytuzT — ELO 2476, themes: advantage, deflection, kingsideAttack, side to move: Black
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_1856?
A black bishop defended by at least one black piece, not attacked by white, on any square. 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 251 tagged puzzles (2.5% of the set), spanning Lichess ELO 721 to 2683 with a median of 1646.
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.