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Here's a special and interesting chess problem that I came across the other day.

It's White to move and checkmate Black in 7 moves.

Source: Милошески, Бошко Mihajloski, Zlatko, Novi temi 1975 Comm.

As usual, no using a computer and no Googling or anything like that for the solution. You must use your own brain power!

enter image description here

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  • $\begingroup$ I assume you mean forced mate in 7? $\endgroup$ – Thomas Markov Jul 1 at 13:25
  • $\begingroup$ What definition of "forced" do you use here? $\endgroup$ – Rewan Demontay Jul 1 at 13:26
  • $\begingroup$ All of black's moves are determined by the game-state rather than black. $\endgroup$ – Thomas Markov Jul 1 at 13:27
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    $\begingroup$ Well each side plays their best moves $\endgroup$ – Rewan Demontay Jul 1 at 13:28
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  1. The position is legal

Black played h5xg4 (or h4xg3, or h3xg2) after White played g2-g4-g5, and White took the bQ with dxe

  1. The key move is

1.Ba4

Threatening

2.Bb6# or 2.Ne4#

Black can only defend with

1...b5 (giving an escape square on c6)

But then :

2.axb6ep! d5 (controlling e4)
3.exd6ep! e5+ (checking)
4.fxe6ep! f5 (controlling e4)
5.gxf6ep! g5+ (checking)
6.hxg6ep! ... White always renews the threat of Ne4#

Now after

any sixth move by Black, White will mate with 7.Ne4#.

It is special because

5 consecutive en passant captures is quite possibly the record for a direct mate.

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  • 1
    $\begingroup$ @RewanDemontay Why is Nxf6 not legal? $\endgroup$ – Sleafar Jul 1 at 17:20
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    $\begingroup$ Whites 5th move was gxf6, so there is a pawn to take. $\endgroup$ – Sleafar Jul 1 at 17:25
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    $\begingroup$ @RewanDemontay Maybe you should look at the position you posted. The knight can definitely go to f6 (or even better to g5 in 2nd move). $\endgroup$ – Sleafar Jul 1 at 17:30
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    $\begingroup$ Black last move on 6th won't matter that much after the update in OP. $\endgroup$ – Shinjo Jul 2 at 4:41
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    $\begingroup$ I think you really should proofread your last comment... $\endgroup$ – Evargalo Jul 2 at 20:00

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