A black bishop that is active or well-centralised in an endgame or middlegame, often serving as a key defensive or offensive piece near the opponent's structure.
SAE concept sae_321 fires when a black bishop that is active or well-centralised in an endgame or middlegame, often serving as a key defensive or offensive piece near the opponent's structure.. It appears in 9 of 9,950 Climbchess puzzles (0.1%), spanning ELO 916–2694 (median 2444).
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This page documents A black bishop that is active or…, 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 that is active or well-centralised in an endgame or middlegame, often serving as a key defensive or offensive piece near the opponent's structure.
This pattern fires in 9 of our 9,950 tagged puzzles. The puzzles where it appears span ELO 916 to 2694, with a median rating of 2444. That distribution tells you whether this is a beginner cue or a master-level subtlety.
Pattern statistics
| Concept ID | sae_321 |
|---|---|
| Puzzles where it fires | 9 |
| Min ELO | 916 |
| Median ELO | 2444 |
| Max ELO | 2694 |
| Coverage | 0.09% 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 9 puzzles spanning the rating distribution. Each links to its own page with full move list and related concepts.
- Puzzle wHKZX — ELO 916, themes: doubleBishopMate, master, mate, side to move: White
- Puzzle wHKZX_F — ELO 916, themes: doubleBishopMate, master, mate, side to move: Black
- Puzzle 00yzd — ELO 1811, themes: advancedPawn, advantage, endgame, side to move: White
- Puzzle 00yzd_F — ELO 1811, themes: advancedPawn, advantage, endgame, side to move: Black
- Puzzle uuH2Y — ELO 2444, themes: advantage, defensiveMove, endgame, side to move: Black
- Puzzle uuH2Y_F — ELO 2444, themes: advantage, defensiveMove, endgame, side to move: White
- Puzzle uuH2Y_M — ELO 2444, themes: advantage, defensiveMove, endgame, side to move: Black
- Puzzle zzsAd — ELO 2694, themes: advantage, long, middlegame, side to move: Black
- Puzzle zzsAd_F — ELO 2694, themes: advantage, long, middlegame, 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_321?
A black bishop that is active or well-centralised in an endgame or middlegame, often serving as a key defensive or offensive piece near the opponent's structure. 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 9 tagged puzzles (0.1% of the set), spanning Lichess ELO 916 to 2694 with a median of 2444.
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.