Hardest Mate

3 knights+king VS knight + king

the hardest checkmate is the reset mate,casle mate and the en passant mate

I think this is the hardest mate

I call this: The starting position mate

N+N+K vs K+P checkmate.

I can checkmate in 20 moves.

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Two knights checkmate

#143 is facts

the hardest checkmate is en passant mate and double disambiguated bishop checkmate is the hardest checkmate

this is the double bishop or triple bishop disambiguated bishop checkmate

and the en passant mate is this