Detects a middlegame or endgame position with mutual pawn tension and active piece pressure, often involving a contested pawn chain on both sides.
SAE concept sae_1739 fires when detects a middlegame or endgame position with mutual pawn tension and active piece pressure, often involving a contested pawn chain on both sides.. It appears in 12 of 9,950 Climbchess puzzles (0.1%), spanning ELO 693–2041 (median 1644).
Free forever · no email · no signup · delete data anytime.
This page documents Detects a middlegame or endgame position with…, 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 middlegame or endgame position with mutual pawn tension and active piece pressure, often involving a contested pawn chain on both sides.
This pattern fires in 12 of our 9,950 tagged puzzles. The puzzles where it appears span ELO 693 to 2041, with a median rating of 1644. That distribution tells you whether this is a beginner cue or a master-level subtlety.
Pattern statistics
| Concept ID | sae_1739 |
|---|---|
| Puzzles where it fires | 12 |
| Min ELO | 693 |
| Median ELO | 1644 |
| Max ELO | 2041 |
| Coverage | 0.12% 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 zxzPT — ELO 693, themes: kingsideAttack, mate, mateIn2, side to move: Black
- Puzzle zxzPT_F — ELO 693, themes: kingsideAttack, mate, mateIn2, side to move: White
- Puzzle zxzPT_M — ELO 693, themes: kingsideAttack, mate, mateIn2, side to move: Black
- Puzzle 01Cdm_M — ELO 1573, themes: crushing, long, middlegame, side to move: White
- Puzzle zwWDV — ELO 1644, themes: crushing, defensiveMove, deflection, side to move: White
- Puzzle zwWDV_M — ELO 1644, themes: crushing, defensiveMove, deflection, side to move: White
- Puzzle zgto8 — ELO 2037, themes: clearance, crushing, endgame, side to move: Black
- Puzzle zgto8_F — ELO 2037, themes: clearance, crushing, endgame, side to move: White
- Puzzle zgto8_M — ELO 2037, themes: clearance, crushing, endgame, side to move: Black
- Puzzle ztSDk — ELO 2041, themes: crushing, endgame, long, 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_1739?
Detects a middlegame or endgame position with mutual pawn tension and active piece pressure, often involving a contested pawn chain on both sides. 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 12 tagged puzzles (0.1% of the set), spanning Lichess ELO 693 to 2041 with a median of 1644.
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.