Knight on an exposed square that serves as a focal point for a tactical sequence, regardless of exact attacker balance.
SAE concept sae_26529 fires when knight on an exposed square that serves as a focal point for a tactical sequence, regardless of exact attacker balance.. It appears in 38 of 9,950 Climbchess puzzles (0.4%), spanning ELO 815–2682 (median 1850).
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This page documents Knight on an exposed square that serves as a…, 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:
Knight on an exposed square that serves as a focal point for a tactical sequence, regardless of exact attacker balance.
This pattern fires in 38 of our 9,950 tagged puzzles. The puzzles where it appears span ELO 815 to 2682, with a median rating of 1850. That distribution tells you whether this is a beginner cue or a master-level subtlety.
Pattern statistics
| Concept ID | sae_26529 |
|---|---|
| Puzzles where it fires | 38 |
| Min ELO | 815 |
| Median ELO | 1850 |
| Max ELO | 2682 |
| Coverage | 0.38% 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 zzccg — ELO 815, themes: crushing, endgame, long, side to move: Black
- Puzzle zwLgk — ELO 1171, themes: mate, mateIn1, middlegame, side to move: Black
- Puzzle zt6Au_F — ELO 1441, themes: advantage, middlegame, short, side to move: White
- Puzzle 0150p_F — ELO 1676, themes: crushing, endgame, long, side to move: Black
- Puzzle zzpd8_M — ELO 1677, themes: crushing, middlegame, pin, side to move: Black
- Puzzle zv3kg — ELO 1850, themes: crushing, deflection, exposedKing, side to move: Black
- Puzzle 01nj2 — ELO 2066, themes: advantage, long, middlegame, side to move: White
- Puzzle yePN4_F — ELO 2076, themes: advantage, intermezzo, master, side to move: Black
- Puzzle zuUUy_F — ELO 2205, themes: advantage, middlegame, pin, side to move: White
- Puzzle zo9Pp — ELO 2493, themes: crushing, fork, interference, 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_26529?
Knight on an exposed square that serves as a focal point for a tactical sequence, regardless of exact attacker balance. 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 38 tagged puzzles (0.4% of the set), spanning Lichess ELO 815 to 2682 with a median of 1850.
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.