I've created this chess problem for today. it's White to move and their pawns move upward. Can you find the key move? Have fun, and no computers are allowed!
Checkmate In 5 Moves
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Let's see if black has a good way to prevent
the white king walking to f3 to support the bishop giving mate on g2.
Black can try
threatening to put the knight on g5 to prevent the king from entering.
Now, if white takes on e6, the white king does not have enough time to get to f3 as after
2. Bxe6 b5
3. Ke4 b6
black is in stalemate.
So, it seems that plan doesn't quite work. However, white has another way to deliver mate:
Bring the king over to f4 instead and use the other bishop to deliver mate.
2. Ke4 Ng5+
3. Kf4 Ne6+ (otherwise 4. Bxg4#)
4. Bxe6 b5
I think that this is not
mate in 5
mate in 6
With the first move being
Analyzing all of black options: After this move, black cannot play
1.b5 or 1.Ne8
bacause in these cases
black has no way to stop
2. Ke4 with the idea 3.Kf3 and 4.Bxg2#
One possibility for black is the move
In this case, white cannot play
2.Ke4 because of 2.Ng3 negates every checkmate in 5 or 6: 3.Kf3 Nxf1 or 3.Nxg3 Kxg3)
but has the option to play
2.Rxh5 forcing mate in 6 after 2. b5 3.e8=Q b4 4.Rb5 Bg3 5.Qh8+ Bh4 6.Rf3#
2.e8=Q which is also mate in 6, forcing 2.Nf4+ (because of 2.b5 3.Qxh5 b4 4. Qxh4#) and forcing white to move the king somewhere, having ideas of checkmating with the queen in 2 on Qxg4# or Qxh4#. However, black does always have the option to give check at least once in all of these lines leading to a variety of forced mates in 6
Looking at the other possible first moves for black:
is also mate in 6: It leads to 2.Bxe6 b5 3.e8=Q b4 4.d5. Here, black has three options,
4.Nxe5+ 5.Qxe5 Kg4 6.Be6# or
4.Nf6 5.Qe6+ g4 6.Bxg2# or
4.Nh6 5.Qe6+ g4 6.Bxg2# (same as before)
which is also mate in 6 after
2.Bxf5 e5 3.e8=Q e4 4.Be4 and black having the options
4.Nxe5+ 5.Qxe5 Kg4 6.Qf5# or
black moving the knight to either f6 or h6 which is followed by
5.Qe6+ Ng4 6.Bxg2#