A contested square that serves as a fork or interference target, attacked by at least one piece from each side.
SAE concept sae_10774 fires when a contested square that serves as a fork or interference target, attacked by at least one piece from each side.. It appears in 12 of 9,950 Climbchess puzzles (0.1%), spanning ELO 823–1860 (median 1140).
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This page documents A contested square that serves as a fork or…, 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 square that serves as a fork or interference target, attacked by at least one piece from each side.
This pattern fires in 12 of our 9,950 tagged puzzles. The puzzles where it appears span ELO 823 to 1860, with a median rating of 1140. That distribution tells you whether this is a beginner cue or a master-level subtlety.
Pattern statistics
| Concept ID | sae_10774 |
|---|---|
| Puzzles where it fires | 12 |
| Min ELO | 823 |
| Median ELO | 1140 |
| Max ELO | 1860 |
| 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 zrLmb — ELO 823, themes: attackingF2F7, crushing, deflection, side to move: Black
- Puzzle zrLmb_F — ELO 823, themes: attackingF2F7, crushing, deflection, side to move: White
- Puzzle zzQRF — ELO 948, themes: crushing, endgame, fork, side to move: Black
- Puzzle zzQRF_F — ELO 948, themes: crushing, endgame, fork, side to move: White
- Puzzle zzQRF_M — ELO 948, themes: crushing, endgame, fork, side to move: Black
- Puzzle zqhUo_F — ELO 1140, themes: advantage, interference, middlegame, side to move: White
- Puzzle zqhUo_M — ELO 1140, themes: advantage, interference, middlegame, side to move: Black
- Puzzle 00KSB_M — ELO 1497, themes: crushing, endgame, short, side to move: Black
- Puzzle zzp43 — ELO 1860, themes: advantage, fork, middlegame, side to move: White
- Puzzle zzp43_F — ELO 1860, themes: advantage, fork, middlegame, 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_10774?
A contested square that serves as a fork or interference target, attacked by at least one piece from each side. 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 823 to 1860 with a median of 1140.
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.