user21069: [fen "3Q4/8/k7/5p2/q2p1Pp1/2p3P1/K1P5/3R4 w - - 0 1"]

I recently started playing chess and was doing some puzzles online. It says that this move is checkmate but I don't see why white can't move to b1. Can someone please explain?

user19877: No, the white king can still move to b1.
That said, Kb1 Qb4+; any Qb2 is mate.
 [FEN "3Q4/8/k7/5p2/q2p1Pp1/2p3P1/K1P5/3R4 w - - 0 1"]

 1. Kb1 Qb4+ 2. Ka2 Qb2# 


21069: <pre><code>[fen "3Q4/8/k7/5p2/q2p1Pp1/2p3P1/K1P5/3R4 w - - 0 1"]
</code></pre>

<p>I recently started playing chess and was doing some puzzles online. It says that this move is checkmate but I don't see why white can't move to b1. Can someone please explain?</p>
 19877: <p>No, the white king can still move to b1.</p>

<p>That said, Kb1 Qb4+; any Qb2 is mate.</p>

<pre><code> [FEN "3Q4/8/k7/5p2/q2p1Pp1/2p3P1/K1P5/3R4 w - - 0 1"]

 1. Kb1 Qb4+ 2. Ka2 Qb2# 
</code></pre>
