Detects a knight posted on a central or near-central square (c3–f5 region) that is under attack and defended, creating a tactical tension point in the position.
SAE concept sae_355 fires when detects a knight posted on a central or near-central square (c3–f5 region) that is under attack and defended, creating a tactical tension point in the position.. It appears in 991 of 9,950 Climbchess puzzles (10.0%), spanning ELO 670–2691 (median 1670).
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This page documents Detects a knight posted on a central 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:
Detects a knight posted on a central or near-central square (c3–f5 region) that is under attack and defended, creating a tactical tension point in the position.
This pattern fires in 991 of our 9,950 tagged puzzles. The puzzles where it appears span ELO 670 to 2691, with a median rating of 1670. That distribution tells you whether this is a beginner cue or a master-level subtlety.
Pattern statistics
| Concept ID | sae_355 |
|---|---|
| Puzzles where it fires | 991 |
| Min ELO | 670 |
| Median ELO | 1670 |
| Max ELO | 2691 |
| Coverage | 9.96% 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 zsJLN — ELO 670, themes: mate, mateIn1, middlegame, side to move: Black
- Puzzle yoEez_F — ELO 942, themes: anastasiaMate, endgame, mate, side to move: White
- Puzzle 01oZW — ELO 1163, themes: mate, mateIn1, middlegame, side to move: White
- Puzzle yBmYy — ELO 1329, themes: discoveredCheck, doubleCheck, kingsideAttack, side to move: Black
- Puzzle 01hOX — ELO 1558, themes: crushing, middlegame, short, side to move: Black
- Puzzle zwdQj_M — ELO 1670, themes: crushing, defensiveMove, long, side to move: White
- Puzzle zy1Vi_F — ELO 1884, themes: kingsideAttack, mate, mateIn2, side to move: Black
- Puzzle zySyD_M — ELO 2081, themes: advantage, discoveredAttack, fork, side to move: White
- Puzzle 00fXf — ELO 2228, themes: advantage, master, middlegame, side to move: White
- Puzzle zv5SF — ELO 2451, themes: attraction, crushing, endgame, 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_355?
Detects a knight posted on a central or near-central square (c3–f5 region) that is under attack and defended, creating a tactical tension point in the position. 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 991 tagged puzzles (10.0% of the set), spanning Lichess ELO 670 to 2691 with a median of 1670.
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.