An advanced or outpost knight (5th rank or higher) that is vulnerable to opponent attack.

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

SAE concept sae_32970 fires when an advanced or outpost knight (5th rank or higher) that is vulnerable to opponent attack.. It appears in 13 of 9,950 Climbchess puzzles (0.1%), spanning ELO 642–2441 (median 1077).

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This page documents An advanced or outpost knight (5th rank 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:

An advanced or outpost knight (5th rank or higher) that is vulnerable to opponent attack.

This pattern fires in 13 of our 9,950 tagged puzzles. The puzzles where it appears span ELO 642 to 2441, with a median rating of 1077. 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:

• A white bishop on the 3rd rank in an endgame, often on the same diagonal as… — similarity 0.105
• A knight on an outpost or advanced square that is actively contested between… — similarity 0.089
• A contested square on the 5th rank where white has or is about to place a… — similarity 0.059
• White rook on the back ranks in a position with a mating attack or deflection… — similarity 0.059
• Active black rook in an endgame, often on an open file or rank, participating… — similarity 0.029

Example puzzles

Below are 10 puzzles spanning the rating distribution. Each links to its own page with full move list and related concepts.

• Puzzle zt2mj — ELO 642, themes: advantage, discoveredAttack, endgame, side to move: White
• Puzzle zt2mj_F — ELO 642, themes: advantage, discoveredAttack, endgame, side to move: Black
• Puzzle zt2mj_M — ELO 642, themes: advantage, discoveredAttack, endgame, side to move: White
• Puzzle zxThm_M — ELO 875, themes: crushing, endgame, master, side to move: White
• Puzzle zzbZA_F — ELO 1077, themes: crushing, discoveredAttack, endgame, side to move: Black
• Puzzle zzbZA_M — ELO 1077, themes: crushing, discoveredAttack, endgame, side to move: White
• Puzzle z7Cwu — ELO 1176, themes: endgame, hookMate, mate, side to move: Black
• Puzzle 00fba_M — ELO 1999, themes: crushing, long, master, side to move: White
• Puzzle zuTGU — ELO 2441, themes: crushing, endgame, long, side to move: Black
• Puzzle zuTGU_F — ELO 2441, 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).