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This week's problem is a fine cyclical-theme effort by a leading Israeli problemist.
The mate is to be delivered on d3, but how? The try 1.Qf5? threatens mate on that square,
and the defences 1...c4/e4 fail to 2.Sf3/Qxd5# respectively, but Black has the defence
A second try is 1.Qh3? with the same threat, and now the defences
1...c4/e4/Sc3 fail to 2.Sb3/Qxh8/Qxc3#, but 1...f3! refutes. Note how the mates after
1...c4 and 1...e4 are changed from the first try.
The key is 1.Qb5! and now we have more changed mates: 1...c4/e4/Sc3 fail to
The result is a total of two changed mates across three phases of play, or a 3x2 Zagoruiko.
In addition there are changed mates after 1...Sc3 in two of the phases. Also
note the reciprocal change of mates after 1...c4/e4 between the first try and the key.
Any comments or questions on this problem should be addressed to
Steve Giddins (our Libarian and Archivist) using the 'Contact'
item in the menu on the left.