Problem Display
PID: 214350 (2K4n/6R1/4Q3/8/3pN2p/R3N2n/8/1b2k2r w - - 0 1)

Anonymous

American Problem Association, 1878

2K4n/6R1/4Q3/8/3pN2p/R3N2n/8/1b2k2r

#4

6 + 7


6490 yacpdb 2020

SOLUTION


  • SOUND
  • Keys
    • 1.Qb3!
      • threat
        • 2.Qd1#
      • 1...Ke2
        • 2.Rg2+
          • 2...Kf3
            • 3.Sd2+
              • 3...Kf4
                • 4.Qb8#
          • 2...Sf2
            • 3.Rxf2+
              • 3...Ke1
                • 4.Sg2#
                • 4.Qd1#
                • 4.Qxb1#
                • 4.Qb4#
        • 2.Sc2
          • threat
            • 3.Qd3#
            • 3.Qf3#
          • 2...Kd1
            • 3.Sxd4+
              • 3...Kc1
                • 4.Se2#
              • 3...Ke1
                • 4.Qxb1#
              • 3...Bc2
                • 4.Ra1#
            • 3.Qxb1+
              • 3...Ke2
                • 4.Sxd4#
          • 2...Bxc2
            • 3.Qxc2+
              • 3...Ke1
                • 4.Ra1#
              • 3...Kf1
                • 4.Ra1#
                • 4.Qd1#
          • 2...Sf2
            • 3.Qf3+
              • 3...Kf1
                • 4.Sd2#
                • 4.Qxf2#
      • 1...Bxe4
        • 2.Qd1+
          • 2...Kf2
            • 3.Rg2+
              • 3...Bxg2
                • 4.Sg4#
      • 1...Sf2
        • 2.Sg2+
          • 2...Kf1
            • 3.Qxb1+
              • 3...Ke2
                • 4.Sf4#
              • 3...Sd1
                • 4.Qxd1#
          • 2...Ke2
            • 3.Qf3+
              • 3...Kf1
                • 4.Qxf2#

FEATURES


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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).