A white knight or bishop on a contested central square, attacked by black and supported by multiple white defenders.
SAE concept sae_5491 fires when a white knight or bishop on a contested central square, attacked by black and supported by multiple white defenders.. It appears in 15 of 9,950 Climbchess puzzles (0.2%), spanning ELO 962–2413 (median 1575).
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This page documents A white knight or bishop on a contested central…, 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 white knight or bishop on a contested central square, attacked by black and supported by multiple white defenders.
This pattern fires in 15 of our 9,950 tagged puzzles. The puzzles where it appears span ELO 962 to 2413, with a median rating of 1575. That distribution tells you whether this is a beginner cue or a master-level subtlety.
Pattern statistics
| Concept ID | sae_5491 |
|---|---|
| Puzzles where it fires | 15 |
| Min ELO | 962 |
| Median ELO | 1575 |
| Max ELO | 2413 |
| Coverage | 0.15% 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 zrKLP_M — ELO 962, themes: mate, mateIn1, middlegame, side to move: Black
- Puzzle 01OE9 — ELO 1081, themes: advantage, long, master, side to move: Black
- Puzzle zzKq9 — ELO 1560, themes: crushing, kingsideAttack, long, side to move: White
- Puzzle zzKq9_F — ELO 1560, themes: crushing, kingsideAttack, long, side to move: Black
- Puzzle zxpDy_F — ELO 1575, themes: advantage, middlegame, short, side to move: White
- Puzzle zxpDy_M — ELO 1575, themes: advantage, middlegame, short, side to move: Black
- Puzzle zuQ7i_F — ELO 1949, themes: clearance, crushing, endgame, side to move: Black
- Puzzle zuQ7i_M — ELO 1949, themes: clearance, crushing, endgame, side to move: White
- Puzzle zvS2x — ELO 2413, themes: advantage, clearance, intermezzo, side to move: Black
- Puzzle zvS2x_F — ELO 2413, themes: advantage, clearance, intermezzo, 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_5491?
A white knight or bishop on a contested central square, attacked by black and supported by multiple white defenders. 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 15 tagged puzzles (0.2% of the set), spanning Lichess ELO 962 to 2413 with a median of 1575.
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.