A square on the 6th, 7th, or 8th rank is attacked by one white piece and defended by one black piece, with the square being empty.
SAE concept sae_11553 fires when a square on the 6th, 7th, or 8th rank is attacked by one white piece and defended by one black piece, with the square being empty.. It appears in 94 of 9,950 Climbchess puzzles (0.9%), spanning ELO 643–2191 (median 891).
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This page documents A square on the 6th, 7th, or 8th rank 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 square on the 6th, 7th, or 8th rank is attacked by one white piece and defended by one black piece, with the square being empty.
This pattern fires in 94 of our 9,950 tagged puzzles. The puzzles where it appears span ELO 643 to 2191, with a median rating of 891. That distribution tells you whether this is a beginner cue or a master-level subtlety.
Pattern statistics
| Concept ID | sae_11553 |
|---|---|
| Puzzles where it fires | 94 |
| Min ELO | 643 |
| Median ELO | 891 |
| Max ELO | 2191 |
| Coverage | 0.94% 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 zrzrE — ELO 643, themes: advantage, fork, master, side to move: Black
- Puzzle zzWQ5 — ELO 676, themes: crushing, endgame, fork, side to move: Black
- Puzzle 011ON — ELO 793, themes: crushing, endgame, fork, side to move: White
- Puzzle zzy5j_F — ELO 806, themes: endgame, mate, mateIn1, side to move: Black
- Puzzle zunL5_M — ELO 839, themes: crushing, fork, middlegame, side to move: White
- Puzzle z1FYR_F — ELO 891, themes: deflection, discoveredAttack, endgame, side to move: Black
- Puzzle zzWWF_F — ELO 981, themes: advantage, endgame, fork, side to move: Black
- Puzzle ywUnd_F — ELO 1179, themes: advancedPawn, clearance, crushing, side to move: White
- Puzzle yGBGk_M — ELO 1661, themes: kingsideAttack, mate, mateIn2, side to move: Black
- Puzzle lpfBX_M — ELO 1888, themes: mate, mateIn1, 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_11553?
A square on the 6th, 7th, or 8th rank is attacked by one white piece and defended by one black piece, with the square being empty. 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 94 tagged puzzles (0.9% of the set), spanning Lichess ELO 643 to 2191 with a median of 891.
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.