An advanced pawn on the 4th–5th rank adjacent to (but not necessarily directly in front of) the king, in a king-and-pawn endgame with zugzwang themes.
SAE concept sae_13913 fires when an advanced pawn on the 4th–5th rank adjacent to (but not necessarily directly in front of) the king, in a king-and-pawn endgame with zugzwang themes.. It appears in 39 of 9,950 Climbchess puzzles (0.4%), spanning ELO 605–2562 (median 1144).
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This page documents An advanced pawn on the 4th–5th rank adjacent to…, 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:
An advanced pawn on the 4th–5th rank adjacent to (but not necessarily directly in front of) the king, in a king-and-pawn endgame with zugzwang themes.
This pattern fires in 39 of our 9,950 tagged puzzles. The puzzles where it appears span ELO 605 to 2562, with a median rating of 1144. That distribution tells you whether this is a beginner cue or a master-level subtlety.
Pattern statistics
| Concept ID | sae_13913 |
|---|---|
| Puzzles where it fires | 39 |
| Min ELO | 605 |
| Median ELO | 1144 |
| Max ELO | 2562 |
| Coverage | 0.39% 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 yS8nE — ELO 605, themes: crushing, endgame, long, side to move: Black
- Puzzle xOcXH_F — ELO 676, themes: crushing, endgame, long, side to move: Black
- Puzzle uOpyA — ELO 820, themes: crushing, defensiveMove, endgame, side to move: White
- Puzzle zZGK9_F — ELO 862, themes: crushing, endgame, pawnEndgame, side to move: White
- Puzzle z4tZ2_F — ELO 1014, themes: crushing, defensiveMove, endgame, side to move: Black
- Puzzle zxCq4_F — ELO 1144, themes: crushing, endgame, long, side to move: Black
- Puzzle zzrSi — ELO 1591, themes: crushing, endgame, long, side to move: White
- Puzzle 00qb9 — ELO 1878, themes: crushing, endgame, pawnEndgame, side to move: Black
- Puzzle zX4Wb — ELO 1998, themes: crushing, defensiveMove, endgame, side to move: White
- Puzzle zeSQD_M — ELO 2236, 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_13913?
An advanced pawn on the 4th–5th rank adjacent to (but not necessarily directly in front of) the king, in a king-and-pawn endgame with zugzwang themes. 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 39 tagged puzzles (0.4% of the set), spanning Lichess ELO 605 to 2562 with a median of 1144.
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.