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This week’s problem is a moremover, showing a well-known three- and moremover theme.
White has three mate threats (Ra7/Sc5/Ra3), but all are adequately covered. No
The key is the unpinning move 1.Kb1!, which threatens 2.Ra3#. The thematic
defences both involve checks on the back rank:
1...Rh1+ is met by 2.Bf1! Rxf1+ 3.Ka2, and now 4.Ra7# is threatened, and the
defence 3...Rf7 blocks the Bg8 and unpins the Rb3, allowing the original
1...Rg1+ is met in similar fashion: by 2.Bd1! Rxd1+ 3.Ka2. Now the
threat is 4.Sc5#, and the defence 3...Rd5 again unpins and allows
Finally, we have the by-play 1...Bxb3 2.cxb3+ Kxb3 3.Nd2+ Ka4 4.Bd1#
The theme here is the Roman theme. A black unit (here, the two black rooks) provide
an adequate defence against a certain threat (Ra7 and Sc5 respectively). The unit
is decoyed away to another square (f1/d1), from which it can defeat the threat in a
different way (3...Rf7/Rd5), but that new way has a weakness (unpinning the wRb3),
not present in the original defence.
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