Pioneer Youth Elite Cup · 2025.12.11 · Elo 2473/2547 · defensive · ★
The daily position for Monday 28 September 2026. It is still open to solve — the grader reads your whole line, sidelines and evaluation included, before anything here is shown. Cover the solution and solve it first →
Black to move. the model predicts 60% at this level.
The solution
58…♖︎b6!(not58…♔︎d5?59.b6♖︎b760.♖︎b5++−)59.♖︎b4(59.♔︎c4is as good:59…♔︎e460.♖︎e2+♔︎f3=)59…♔︎d560.♖︎xd4+♔︎c561.♖︎e4(61.♖︎c4+is as good:61…♔︎xb562.♖︎c3♖︎c6=)61…♖︎d6+(not61…♖︎xb5?62.♖︎e5+♔︎b663.♖︎xb5+♔︎xb564.♔︎d4+−)62.♔︎e3♔︎xb5=
58…♖︎b6 — most players miss this
59…♔︎d5 — the natural move
60…♔︎c5 — the natural move
61…♖︎d6+ — almost nobody finds this · worth +1 · the fair stop: the line may end here
62…♔︎xb5 — routine — shown for completeness, never demanded
“hard to find”, “the natural move” and the rest describe how often this move is played by Maia-2, weighted across the 1500/1900/2000 audience the difficulty model is fitted on — a model of human play, not a count of anyone who solved this position.
Members can take this away as a PGN — the diagram, the verified line and their own analysis in one file, for a database, Anki or Chessable.
What happened at the board
Costa found it · ½-½
the game went on61.♖︎c4+♔︎xb562.♖︎c3♖︎a663.♔︎e4♖︎a4+½-½full game ↗
The field
46% of the 13 committed lines here found the key move — the model predicted 60% at this level.