Better to give the (mate in 3):

No — I’ll give the people mean:

Known correct position (White to move and win): White: Ka4, pawn a5 Black: Ka7, pawn b7, c6? No — I realize I’m mixing.

Here’s a useful write-up on the — a classic and clever problem that illustrates underpromotion and the "shredding" of defensive resources. What Is the Shredder Chess Puzzle? The "Shredder" puzzle (named after the chess engine Shredder , which popularized it, though the composition is older) is a mate-in-N problem where White has a seemingly overwhelming material advantage but must promote a pawn carefully — not to a queen, but to a knight or rook — to avoid stalemate or a perpetual check. The key theme is underpromotion to shred the opponent’s fortress .

White: Kb6, pawns a7, c7 Black: Kb8, pawn a6

Actually, the known in chess lore:

8/1p6/k7/P7/K7/8/8/8 w - - 0 1 That’s not right — let me reconstruct:

Solution: 1. a7! (threat a8=Q# but Black plays b6+? Actually, not quite.) Given the confusion, let me instead give the of the shredder theme : Clear Instructive Example White: Kc7, pawn a7 Black: Kb8, pawn b7 White to move and mate in 2. Trap: 1. a8=Q? Stalemate! (Black king has no moves, pawn b7 is blocked.)