Step 1 of 4
White to move · Checkmate
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Shrink the box: keep your queen a knight's move from the king as it steps back.
Shrink the box: keep your queen a knight's move from the king as it steps back.
The queen cannot mate on its own, so your king has to help. Keep the queen a knight's move away from the enemy king and follow it as it steps back. Once the king is stuck on the edge, bring your own king up and mate. Before every quiet queen move, check that the enemy king still has a square to go to. If it has none and is not in check, the game is a stalemate.
Every move is checked with an endgame tablebase, which knows the exact result of every position with up to seven pieces. The computer defends perfectly, and if a move throws the result away, the trainer stops and shows you a better one.