A critical 3rd-rank (White) or 6th-rank (Black) square in a king-and-pawn endgame, often key to zugzwang or a pawn breakthrough.
SAE concept sae_31719 fires when a critical 3rd-rank (White) or 6th-rank (Black) square in a king-and-pawn endgame, often key to zugzwang or a pawn breakthrough.. It appears in 29 of 9,950 Climbchess puzzles (0.3%), spanning ELO 1118–2652 (median 1681).
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This page documents A critical 3rd-rank (White) or 6th-rank (Black)…, 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 critical 3rd-rank (White) or 6th-rank (Black) square in a king-and-pawn endgame, often key to zugzwang or a pawn breakthrough.
This pattern fires in 29 of our 9,950 tagged puzzles. The puzzles where it appears span ELO 1118 to 2652, with a median rating of 1681. That distribution tells you whether this is a beginner cue or a master-level subtlety.
Pattern statistics
| Concept ID | sae_31719 |
|---|---|
| Puzzles where it fires | 29 |
| Min ELO | 1118 |
| Median ELO | 1681 |
| Max ELO | 2652 |
| Coverage | 0.29% 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 zN1WI — ELO 1118, themes: crushing, defensiveMove, endgame, side to move: White
- Puzzle zN1WI_M — ELO 1118, themes: crushing, defensiveMove, endgame, side to move: White
- Puzzle z0mjO_M — ELO 1280, themes: crushing, defensiveMove, endgame, side to move: White
- Puzzle zybrY_F — ELO 1374, themes: crushing, endgame, master, side to move: White
- Puzzle yzDK2_F — ELO 1415, themes: crushing, endgame, long, side to move: White
- Puzzle zvEtF — ELO 1681, themes: bishopEndgame, crushing, deflection, side to move: White
- Puzzle 015JV — ELO 1719, themes: advantage, endgame, pawnEndgame, side to move: Black
- Puzzle 01aJJ_M — ELO 1790, themes: crushing, endgame, long, side to move: White
- Puzzle zyc2q_M — ELO 1854, themes: crushing, endgame, long, side to move: White
- Puzzle zRiv6_M — ELO 2188, 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_31719?
A critical 3rd-rank (White) or 6th-rank (Black) square in a king-and-pawn endgame, often key to zugzwang or a pawn breakthrough. 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 29 tagged puzzles (0.3% of the set), spanning Lichess ELO 1118 to 2652 with a median of 1681.
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.