Puzzle zzoES_F — ELO 2418
This is a White-to-move puzzle rated 2418 ELO. The first move is f3g2, tagged with 10 interpretable concepts and Lichess themes: advancedPawn, advantage, endgame.
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Position
White to move. ELO 2418. Themes: advancedPawn, advantage, endgame, exposedKing, promotion, quietMove, veryLong.
FEN: 8/1p3R2/1kp4P/8/3r4/p4BP1/8/6K1 w - - 0 32
Show solution (12 ply)
Try to find the move yourself first — look for the rarest concept firing on this position before peeking. Solution sequence: f3g2 d4d1 g1h2 a3a2 h6h7 a2a1q f7f8 a1d4 h7h8q d4g1 h2h3 d1d2
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 Pawn on the 3rd or 4th rank (from its side) that is undefended by its own side…, which appears in only 38 of our 9,950 puzzles (0.38%). 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 2418 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?
2418 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 f3g2.
What concepts does it train?
10 SAE-derived patterns including Advanced passed pawn on the 6th or 7th rank close to…; Detects endgame positions with an advanced passed pawn and…; Detects an empty square on the first rank that is attacked….
Can I attempt it without an account?
Yes — Climbchess requires no signup or email. Click the trainer link to play the position interactively.