Redaction of Slovak journal

Judge: Juraj Brabec.

Closing date:

Problems on diagram with the complete solution should be sent to:

Juraj Lörinc, ul. CSA 333/27, 018 41 Dubnica nad Vahom, SLOVAKIA (or by e-mail to juraj.lorinc@bigfoot.com).

Award will be published in Pat a Mat.

1st phase:1...a, b 2.A, B

2nd phase: 1...b, c 2.C, A

3rd phase: 1...c, a 2.B, C

Or, when inserted appropriately into table:

key | th. | 1...a | 1...b | 1...c |

2.A | 2.B | |||

2.A | 2.C | |||

2.B | 2.C |

Note the diagonal symmetry of table. You see it is one special theme from Z-32-33 family. (3 phases 2 variations each, total 3 defences nad 3 mates.) But there are some other themes in Z-32-33 family and there is one that can be written in the form of cyclic defences or cyclic mates, but not both simultaneously! Just look:

Cyclic defences | Cyclic mates | ||

1st phase:1...a, b 2.A, B 2nd phase: 1...b, c 2.B, C 3rd phase: 1...c, a 2.A, C | 1st phase:1...a, b 2.A, B 2nd phase: 1...a, c 2.C, A 3rd phase: 1...c, b 2.B, C |

key | th. | 1...a | 1...b | 1...c |

2.A | 2.B | |||

2.B | 2.C | |||

2.A | 2.C |

Note there is no symmetry in this table. And this theme from Z-32-33 family is called

Comments to Juraj Lörinc.