# How is a perpetual check reached in this puzzle?

This puzzle on chesstempo caught my eye. We play as White:

``````[FEN "4Q/4p1bk/1p1qp2p/p1p1n2B/4P/2P3B1/PP4P/6K b - - 0 1"]

1. Nf3
``````

Side Note: The answer is of no importance here, so no spoilers from me. :)

The puzzle is tagged with , yet I cannot see the perpetual check here. It has been discussed in the comments under the puzzle:

• Why not just gxf3 and after Qxg3+, run away with the king to the left board edge and hide between pawns?
• Because he can’t hide. When the king reaches c2, the black queen attacks from e2. When the king is on b3, the queen moves to b5, and perpetual.

However, I do not think this is quite right. b5 is protected by the White queen. So, where and how is perpetual reached on this board? I would appreciate a hint instead of the full solution. :)

• I don't think there is a perpetual after gxf3 Qxg3+, but then there doesn't need to be as black is safe then. The perpetual meant is probably in the line Kf2 Ne5 Bxe5 Qd2+, as mentioned in another comment. Commented Dec 25, 2020 at 17:30
• the notation should be 1... Nf3+ Commented Jul 3 at 9:43

``````[FEN "4Q/4p1bk/1p1qp2p/p1p1n2B/4P/2P3B1/PP4P/6K b - - 0 1"]