Black bishop on an active diagonal that is contested or under exchange pressure from a white minor piece.
SAE concept sae_25378 fires when black bishop on an active diagonal that is contested or under exchange pressure from a white minor piece.. It appears in 18 of 9,950 Climbchess puzzles (0.2%), spanning ELO 808–1343 (median 1142).
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This page documents Black bishop on an active diagonal that is…, 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:
Black bishop on an active diagonal that is contested or under exchange pressure from a white minor piece.
This pattern fires in 18 of our 9,950 tagged puzzles. The puzzles where it appears span ELO 808 to 1343, with a median rating of 1142. That distribution tells you whether this is a beginner cue or a master-level subtlety.
Pattern statistics
| Concept ID | sae_25378 |
|---|---|
| Puzzles where it fires | 18 |
| Min ELO | 808 |
| Median ELO | 1142 |
| Max ELO | 1343 |
| Coverage | 0.18% 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 zu9s3 — ELO 808, themes: crushing, discoveredAttack, endgame, side to move: Black
- Puzzle zu9s3_F — ELO 808, themes: crushing, discoveredAttack, endgame, side to move: White
- Puzzle ug1j3 — ELO 885, themes: crushing, endgame, master, side to move: Black
- Puzzle ug1j3_M — ELO 885, themes: crushing, endgame, master, side to move: Black
- Puzzle zytIA — ELO 1134, themes: advantage, endgame, fork, side to move: White
- Puzzle 00nji — ELO 1142, themes: advantage, endgame, short, side to move: Black
- Puzzle 00nji_F — ELO 1142, themes: advantage, endgame, short, side to move: White
- Puzzle zxSMd — ELO 1176, themes: crushing, discoveredAttack, endgame, side to move: Black
- Puzzle zxSMd_M — ELO 1176, themes: crushing, discoveredAttack, endgame, side to move: Black
- Puzzle 02AeY_F — ELO 1343, themes: advantage, endgame, fork, 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_25378?
Black bishop on an active diagonal that is contested or under exchange pressure from a white minor piece. 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 18 tagged puzzles (0.2% of the set), spanning Lichess ELO 808 to 1343 with a median of 1142.
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.