challenging · rating 1884
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Black to move. Opponent's last move: Rb1.
advancedPawncrushingendgamelongpromotionsacrifice
1249 plays
5 plies in the line
Reveal line
Opponent's last move: Rb1
Solution: Qxb1 → Nxb1 → a2 → Nc3 → a1=Q