Originally posted by SwissGambit
C. Gamnitzer, 1999
This was my very first thoughts on the moves to checkmate the Black king in 5 moves:
Even though I could not get this to work by experimenting with different moves and order of moves, I believed I must be on the right track because in the postion with the White bishop at d4 as below:
So the question is after the first move of 1.Bd4, can Black prevent a checkmate in four more moves? I don't think so. Therefore, 1.Bd4 looks like the key first move. Now the pressure is on Black to stop the plan shown above.
Moving the a5 knight does not help black with stopping the checkmate plan of White.
Moving the h7 knight just leads to a quicker mate. Ex: 1...Nf6 2.Bxf6 and 3.Rf4#
1f 1...Be3 to block the bishop from being able to deliver the final checkmate of 5.Bf2# Then 2.Nxe3#.
Moving 1...Bf7 to prevent 3.Ne6+, allows 2.e8=Q Bxe8 3.Ne7# or 2...Bxd5 3.Qc8+ Be6 4.Qxe6#.
Queening the h2 pawn doesn't change anything, but the best try is 1...h1=N which stops the final checkmate of 5.Bf2#. However, White can then play 2.Kxc1 planning 3.Ne4#. The only move to prevent checkmate is 2...Nb3+ or ...Nc4, but these only delays it.
So the solution to the Checkmate in 5 puzzle is as follows: