1

I tried to get the smallest sequence of moves that would result in a checkmate*( or rather Helpmate)* with the last move being a en passant . This is the shortest I could get :

[Title "Shortest En Passant Helpmate?"]
[fen ""]

1. e4 f6 2. Qe2 Kf7 3. e5 Ke6 4. Qe4 Nc6 5. Be2 Nb8 6. Nc3 Nc6 7. Nb5 Nb8 8. Nf3 Nc6 9. d3 Kf7 10. Nfd4 Nb8 11. Nb3 Nc6 12. Na5 Nb8 13. Nc4 Nc6 14. Nb6 Ke6 15. Bh5 Nb8 16. O-O d5 17. exd6#

Is there a shorter way to achieve it or 13 is the limit ?

4

I found one in 8 moves:

[Title "Shortest En Passant Helpmate?"]
[fen ""]

1. e4 f6 2. Bb5 Kf7 3. Qe2 Ke6 4. e5 Qe8 5. Qe4 Qf7 6. d4 a6 7. Bf4 d5 8.exd6#
| improve this answer | |
  • @BrianTowers Thanks for the edit. Where can I learn to produce those animated boards? – Kortchnoi Apr 18 at 13:01
  • 1
    I learned by selecting edit on posts to see how they were done. – Michael West Apr 18 at 13:04
  • @MichaelWest That's exactly what I tried to do... but I failed ;-) – Kortchnoi Apr 18 at 13:07
  • 3
    @Kortchnoi Where you went wrong is that you didn't copy the format (including spaces and blank lines) exactly. The formatter is very unforgiving – Brian Towers Apr 18 at 13:46

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