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If this problem is new to you. Or if you've first encounter this problem, then you are free to solve without looking on the answer.

2013 is full of challenges. Solve this problem and feel great!

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K x N

This is rubbish! and not a chess problem!! how can white have 20 pieces on board? when each player can have only 16? lol xD

Sorry, I know the puzzle's been answered, but what about: 1. Qxd2 any 2. Nb4#

Sorry, I know the puzzle's been answered, but what about: 1. Qxd2 any 2. Nb4#

If 1.Qxd2? then bxc4!!

Hello!

I saw that Re1 was a solution, but what about Re5+ ?

If the king takes on c4, you have Qc2#

if the knight takes on e5, you have Nxf4#

I don't see anything else black can do

Edit: Oops, after Re5+ Kc4 Qc2 you have Kd4 because the rook on e5 now blocks the bishop on h8

I saw that Re1 was a solution, but what about Re5+ ?

If the king takes on c4, you have Qc2#

if the knight takes on e5, you have Nxf4#

I don't see anything else black can do

Edit: Oops, after Re5+ Kc4 Qc2 you have Kd4 because the rook on e5 now blocks the bishop on h8

ok...

Warning: If you can't solve this problem within a 2-hour period, please stop solving or you will go mad!White mates in 2