Crazyhouse checkmate puzzle!

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stmiuy
White to move and checkmate in #13.
White has 3 pawn and 1 rook.♙♙♙♖
Black has all the other pieces.♟♟♟♟♟♟♟♟♞♝♝♛♛

 

stmiuy

Yes.

stmiuy

This is very difficult, as stockfish on lichess.org cannot solve this.

stmiuy
Just after @b7.Black to move.

 

stmiuy

Wha's up .

stmiuy

This takes 10 hours to make.

Maybe to solve this, you need more than a day.

stmiuy

You can mate with all Kd8 Kb8 Bxb7  , however black must do the longest move.

stmiuy

I missed some line.

I fixed this.
 
White to move and checkmate in #12.
White has 3 pawn and 1 rook.♙♙♙♖
Black has all the other pieces.♟♟♟♟♟♟♟♞♝♝♛♛
stmiuy

Kd8 is a suiside.wrong.

Black must do the best move to delay checkmate.

stmiuy

Yeah, there is many answers  in this puzzle, this is failure.

stmiuy

Kb8.

helmsknight

Send me this one day in stream and I'll try it out, looking at it right away seems possible @b7 then BxN but I haven't looked at it longer than 10 secs yet! I'll have more time in stream grin.png 

qwesef

https://www.chess.com/forum/view/more-puzzles/puzzle-171?quote_id=38254600#comment_box