BDS
The Problemist Supplement, 2001
#2
ROOK-HOPPER e3:
BISHOP-HOPPERs e8; f7:
NIGHTRIDER d1
1.Nh3! (2.c6#) 1...Sc6 2.Nxf7# 1...Rc6 2.RHe5# 1...d5 2.RHb3# 1...Rxc5 2.Rxc5#
The key guards b6, allowing the threatened battery mate 2.c6# (which unguards b6) to work. Three lines showing varied hopper play follow. 1...Sc6 blocks the threat pawn, but pins the bPd7, as, if it moves, would open the bK to check from the wBHe8 over c6. This allows the pin-mate 2.Nxf7#. 1...Rc6 also blocks the threat pawn, which becomes a hurdle for 2.RHe5#. 1...d5 allows the move 2.RHb3#, which would otherwise be a hurdle for check from the bBHf7.
Developed and maintained by Brian Stephenson.
Implemented with HTML5, MySQL, Perl (with, inter alia, CGI::Simple, HTML::Template & XML::LibXML) &
CSS/Javascript (jQuery, Bootstrap & DataTables).