Helpmate in 5.5. Solution Below.
A few words of explanation first. In a helpmate, Black and White make moves whose sole purpose is to reach a position in which Black is mated. In this case, “5.5” means that White plays first and mates on his sixth move. In a homebase helpmate, all the pieces on the board are on their starting squares. It really is a challenge for composers, subject to this limitation, to find positions in which there is a unique sequence of moves leading to mate. In Geissler’s problem, you might think that there is no way that the wN can be limited to one unique route, or that if the bQ has to move its movement(s) can be uniquely determined. But the German composer has skilfully surmounted these difficulties. You may like to have a go at solving it before reading further, though there’s no shame in deciding quickly to read on to get the solution, as it’s not easy to solve!
It turns out that we have to get the bK to the corner and the bR to g8. The way in which this is done is as follows: 1…Nc3 (this is actually a white move: by convention helpmate solutions show the white and black moves ‘the wrong way round’) 2.Kf8 Nd5 3.Kg8 Nxe7+ 4.Kh8 Nxc8 5.Qg5!! Nd6 6.Rg8 Nxf7. I’ve given 5.Qg5 two exclamation marks because it is remarkable that, when all that the move must accomplish is to get the Q out of the way, there is only square that doesn’t stymie the solution.
Final position after 6…Nxf7 #
If you fancy having a go at composing homebase helpmates let me know. (I have a computer program to test helpmates for soundness.)
This month’s other problem, also gleaned from the most recent issue of The Problemist, is another helpmate, but this time a ‘golden oldie’:
2nd Place, Negy oszag csapatversenye 1950
Helpmate in 3
In this position, it looks too easy: Black plays his P to b1 to unpin the wB, which then goes to a4 and then d7 to give mate. However, White does have to make a move after 1.b2, and, although the d4N (not required for the mate) has plenty of moves available, it turns out to be difficult to find one that doesn’t get in the way. In fact there is only one. And then there is the further difficulty that after the wB has got to a4 it is Black for whom it’s difficult to find a move that doesn’t get in the way. Again, we find that there is only one – which, nicely, captures the white Knight. The solution runs: 1.b2 Ne2! 2.b1N Ba4 3.Bxe2! Bxd7.
Final position after Bxd7#
If you would be interested to see a sample copy of The Problemist let me know – or, better still, go to the British Chess Problem Society website where there is plenty more readable material.
Christopher holds the Grandmaster title for Chess Problem Composition and uses his skills to write a regular column for the Bristol Chess Times. He is also a longterm Horfield Chess Club player (where he is acting secretary).