Black's king is on g8, and the g8 square is attacked by at least two black pieces.

By Climbchess Research · 2026-05-08 · 3 min read · Updated May 8, 2026

SAE concept sae_4035 fires when black's king is on g8, and the g8 square is attacked by at least two black pieces.. It appears in 2 of 9,950 Climbchess puzzles (0.0%), spanning ELO 2299–2299 (median 2299).

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This page documents Black's king is on g8, and the g8 square 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:

Black's king is on g8, and the g8 square is attacked by at least two black pieces.

This pattern fires in 2 of our 9,950 tagged puzzles. The puzzles where it appears span ELO 2299 to 2299, with a median rating of 2299. That distribution tells you whether this is a beginner cue or a master-level subtlety.

Pattern statistics

Related concepts

The five concepts most often co-firing alongside this one (Jaccard similarity over the puzzle co-occurrence graph) are:

• Black rook on an active central or kingside file (d8–h8 range), not… — similarity 0.004
• Black rook on a8 or h8 in an uncastled or partially developed position, not… — similarity 0.003
• Detects positions with an active white knight on an outpost square (typically… — similarity 0.003
• A white knight on a stable central or near-central square, participating in an… — similarity 0.002
• A black knight active in enemy territory, often participating in a mating… — similarity 0.001

Example puzzles

Below are 2 puzzles spanning the rating distribution. Each links to its own page with full move list and related concepts.

• Puzzle ybtwU — ELO 2299, themes: arabianMate, attraction, exposedKing, side to move: Black
• Puzzle ybtwU_F — ELO 2299, themes: arabianMate, attraction, exposedKing, 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).