Chris Feather

Original Fairy problems
01.01.2022 - 30.06.2022

Definitions / Определения

No. 1695 Chris Feather
original - 13.03.2022

white Ke1 Bf3 Sd4 Rb5 black Sg2 Pd3d6 Re4c5 Qc4 Kd5 Ba5
h#2            b) shift a1 ==> b1            4+8
Equipollents AntiCirce

Solution: (click to show/hide)

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Geoff Foster
Geoff Foster
March 17, 2022 06:11

The B1 moves prevent capture of the mating piece, although a slight difference is that 1.Bc4 prevents capture by the pawn (not the unpinned rook). The W1 moves are thematic unpins, making use of the clever twinning. There are pin-mates, although the pins already exist in the initial position. The avoided moves Rc5-c6?? and Rf4-f5?? actually occur in the other solution (as self-blocks), which is a very pleasing feature.

Geoff Foster
Geoff Foster
March 17, 2022 06:17
Reply to  Geoff Foster

Correction: In (b), 2.Rd6 is not a self-block, which is another slight difference.

Kjell Widlert
Kjell Widlert
March 18, 2022 15:59
Reply to  Geoff Foster

2.Rd6 is a square-obstruction for the bQ (3.Qxd5>d6??), which is almost the same as a self-block – just not for the king.