A contested central square on ranks 3-5 that is attacked by at least one enemy piece and defended by at least one friendly piece, in positions requiring precise tactical calculation.
SAE concept sae_9607 fires when a contested central square on ranks 3-5 that is attacked by at least one enemy piece and defended by at least one friendly piece, in positions requiring precise tactical calculation.. It appears in 17 of 9,950 Climbchess puzzles (0.2%), spanning ELO 920–2350 (median 1456).
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This page documents A contested central square on ranks 3-5 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 contested central square on ranks 3-5 that is attacked by at least one enemy piece and defended by at least one friendly piece, in positions requiring precise tactical calculation.
This pattern fires in 17 of our 9,950 tagged puzzles. The puzzles where it appears span ELO 920 to 2350, with a median rating of 1456. That distribution tells you whether this is a beginner cue or a master-level subtlety.
Pattern statistics
| Concept ID | sae_9607 |
|---|---|
| Puzzles where it fires | 17 |
| Min ELO | 920 |
| Median ELO | 1456 |
| Max ELO | 2350 |
| Coverage | 0.17% 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 zw7Eb — ELO 920, themes: advantage, endgame, master, side to move: White
- Puzzle zw7Eb_F — ELO 920, themes: advantage, endgame, master, side to move: Black
- Puzzle 01q7V — ELO 1206, themes: advantage, capturingDefender, endgame, side to move: White
- Puzzle 01q7V_M — ELO 1206, themes: advantage, capturingDefender, endgame, side to move: White
- Puzzle zzmxk_M — ELO 1230, themes: exposedKing, long, mate, side to move: Black
- Puzzle 01pkQ_F — ELO 1456, themes: crushing, endgame, fork, side to move: Black
- Puzzle zzbos — ELO 1460, themes: crushing, middlegame, pin, side to move: White
- Puzzle zzbos_F — ELO 1460, themes: crushing, middlegame, pin, side to move: Black
- Puzzle zx9gT — ELO 1653, themes: discoveredAttack, discoveredCheck, enPassant, side to move: Black
- Puzzle zx9gT_M — ELO 1653, themes: discoveredAttack, discoveredCheck, enPassant, 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_9607?
A contested central square on ranks 3-5 that is attacked by at least one enemy piece and defended by at least one friendly piece, in positions requiring precise tactical calculation. 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 17 tagged puzzles (0.2% of the set), spanning Lichess ELO 920 to 2350 with a median of 1456.
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.