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Chess Problem 1998d8d601

BDS

The Problemist Supplement, 1998

*3Q2K4/3p3p/3k4/3s4/4R3/2p1p3/6*3Q1/2*3R5

#2
Sentinels
LEOs a8, g2
PAO c1 

1.LEg7[+wPg2]! (2.LEd4[+wPg7]#)

1...Sb4[+bPd5]  2.LEa3#
1...Sf4[+bPd5]  2.LEg3[+wPg7]#
1...Sf6[+bPd5]  2.LEh6[+wPg7]#
1...Se7[+bPd5]  2.LEf8[+wPg7]#
1...Sc7[+bPd5]  2.LEb8#
1...Sb6[+bPd5]  2.LEa6#

The key threatens mate over the bS, which, if it were to move, would leave behind a bP and thus not nullify the mate. That knight moves to six squares, but on each one becomes a new immoveable hurdle over which White can mate.

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