A black knight on the back rank (a8–h8) that is not under white attack.
SAE concept sae_6108 fires when a black knight on the back rank (a8–h8) that is not under white attack.. It appears in 19 of 9,950 Climbchess puzzles (0.2%), spanning ELO 615–2550 (median 1653).
Free forever · no email · no signup · delete data anytime.
This page documents A black knight on the back rank (a8–h8) 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:
A black knight on the back rank (a8–h8) that is not under white attack.
This pattern fires in 19 of our 9,950 tagged puzzles. The puzzles where it appears span ELO 615 to 2550, with a median rating of 1653. That distribution tells you whether this is a beginner cue or a master-level subtlety.
Pattern statistics
| Concept ID | sae_6108 |
|---|---|
| Puzzles where it fires | 19 |
| Min ELO | 615 |
| Median ELO | 1653 |
| Max ELO | 2550 |
| Coverage | 0.19% 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 zLpuK — ELO 615, themes: attraction, kingsideAttack, mate, side to move: White
- Puzzle zLpuK_F — ELO 615, themes: attraction, kingsideAttack, mate, side to move: Black
- Puzzle zxbB4 — ELO 1115, themes: attraction, kingsideAttack, master, side to move: White
- Puzzle zxbB4_M — ELO 1115, themes: attraction, kingsideAttack, master, side to move: White
- Puzzle 01xyH_F — ELO 1579, themes: crushing, middlegame, pin, side to move: Black
- Puzzle 021Un — ELO 1653, themes: advantage, fork, intermezzo, side to move: Black
- Puzzle 021Un_M — ELO 1653, themes: advantage, fork, intermezzo, side to move: Black
- Puzzle xnLTc_F — ELO 1670, themes: arabianMate, exposedKing, long, side to move: White
- Puzzle rfaRc_F — ELO 1873, themes: endgame, hookMate, mate, side to move: White
- Puzzle 1u4gJ_F — ELO 2479, themes: backRankMate, master, mate, 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_6108?
A black knight on the back rank (a8–h8) that is not under white attack. 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 19 tagged puzzles (0.2% of the set), spanning Lichess ELO 615 to 2550 with a median of 1653.
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.