Puzzle 01q7V_M — ELO 1206
This is a White-to-move puzzle rated 1206 ELO. The first move is a1f1, tagged with 10 interpretable concepts and Lichess themes: advantage, capturingDefender, endgame.
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Position
White to move. ELO 1206. Themes: advantage, capturingDefender, endgame, fork, long.
FEN: 1k3r2/ppp4p/3b1B1R/5P2/3p4/3P1b2/PPPK4/R7 w - - 6 26
Show solution (6 ply)
Try to find the move yourself first — look for the rarest concept firing on this position before peeking. Solution sequence: a1f1 d6f4 d2e1 f4h6 f1f3 f8f6
Concepts that fire on this position
Our SAE pipeline tagged this position with 10 active features. Each links to a page documenting that pattern in detail.
Why this puzzle is hard
The rarest pattern firing here is A contested central square on ranks 3-5 that is attacked by at least one enemy…, which appears in only 17 of our 9,950 puzzles (0.17%). Rare patterns tend to be the bottleneck — players who haven't internalised them will fail this puzzle even when their tactical calculation is otherwise solid.
The puzzle's Lichess ELO of 1206 reflects this: solvers below that rating typically miss the cue entirely.
Similar puzzles
Puzzles sharing the most concept tags with this one — a stronger signal than theme overlap because it reflects the actual patterns Leela recognises.
Train this pattern
Click through to the Climbchess trainer to attempt the position interactively against the same Leela network that tagged it. The trainer adapts difficulty using your live concept-recognition profile — it surfaces puzzles tagged with concepts you've been missing, not random brawls.
If you want the underlying methodology, the how-it-works page walks through the SAE training run, the labelling pipeline, and the puzzle-tagging procedure end-to-end.
Frequently asked
What is the rating of this puzzle?
1206 Lichess ELO. Solvers below that rating typically miss the key cue.
Which side moves first?
White to move; the first move of the solution is a1f1.
What concepts does it train?
10 SAE-derived patterns including Detects a king on the back rank in a position with active…; Detects a king on a square with few (0-2) friendly…; White bishop on home territory (ranks 1-3) in a standard….
Can I attempt it without an account?
Yes — Climbchess requires no signup or email. Click the trainer link to play the position interactively.