MESON Chess Problem Database

Problem Display
PID: 121113 (k1n5/1R6/n1P5/3N4/6p1/8/4p1K1/8 w - - 0 1)

Niemeijer, Meindert

Inspanning en Ontspanning, 1969

k1n5/1R6/n1P5/3N4/6p1/8/4p1K1/8

#5

4 + 5

6490 yacpdb 2009

SOLUTION

  • SOUND
  • Keys
    • 1.Kf2!
      • threat
        • 2.Kxe2
          • threat
            • 3.Kf1
              • 3...g3
                • 4.Kg2
                  • 4...Sb4
                    • 5.Sc7#
                  • 4...Sc5
                    • 5.Sc7#
                  • 4...Sc7
                    • 5.Sxc7#
                  • 4...Sb8
                    • 5.Sc7#
                  • 4...Sb6
                    • 5.Sxb6#
                  • 4...Sd6
                    • 5.Sb6#
                  • 4...Sa7
                    • 5.Sb6#
                  • 4...Se7
                    • 5.Sb6#
            • 3.Kf2
              • threat
                • 4.Kg3
                  • 4...Sb4
                    • 5.Sc7#
                  • 4...Sc5
                    • 5.Sc7#
                  • 4...Sc7
                    • 5.Sxc7#
                  • 4...Sb8
                    • 5.Sc7#
                  • 4...Sb6
                    • 5.Sxb6#
                  • 4...Sd6
                    • 5.Sb6#
                  • 4...Sa7
                    • 5.Sb6#
                  • 4...Se7
                    • 5.Sb6#
              • 3...g3+
                • 4.Kxg3
                  • 4...Sb4
                    • 5.Sc7#
                  • 4...Sc5
                    • 5.Sc7#
                  • 4...Sc7
                    • 5.Sxc7#
                  • 4...Sb8
                    • 5.Sc7#
                  • 4...Sb6
                    • 5.Sxb6#
                  • 4...Sd6
                    • 5.Sb6#
                  • 4...Sa7
                    • 5.Sb6#
                  • 4...Se7
                    • 5.Sb6#
                • 4.Kg2
                  • 4...Sb4
                    • 5.Sc7#
                  • 4...Sc5
                    • 5.Sc7#
                  • 4...Sc7
                    • 5.Sxc7#
                  • 4...Sb8
                    • 5.Sc7#
                  • 4...Sb6
                    • 5.Sxb6#
                  • 4...Sd6
                    • 5.Sb6#
                  • 4...Sa7
                    • 5.Sb6#
                  • 4...Se7
                    • 5.Sb6#
          • 2...g3
            • 3.Kf1
              • threat
                • 4.Kg2
                  • 4...Sb4
                    • 5.Sc7#
                  • 4...Sc5
                    • 5.Sc7#
                  • 4...Sc7
                    • 5.Sxc7#
                  • 4...Sb8
                    • 5.Sc7#
                  • 4...Sb6
                    • 5.Sxb6#
                  • 4...Sd6
                    • 5.Sb6#
                  • 4...Sa7
                    • 5.Sb6#
                  • 4...Se7
                    • 5.Sb6#
              • 3...g2+
                • 4.Kxg2
                  • 4...Sb4
                    • 5.Sc7#
                  • 4...Sc5
                    • 5.Sc7#
                  • 4...Sc7
                    • 5.Sxc7#
                  • 4...Sb8
                    • 5.Sc7#
                  • 4...Sb6
                    • 5.Sxb6#
                  • 4...Sd6
                    • 5.Sb6#
                  • 4...Sa7
                    • 5.Sb6#
                  • 4...Se7
                    • 5.Sb6#
                • 4.Kg1
                  • 4...Sb4
                    • 5.Sc7#
                  • 4...Sc5
                    • 5.Sc7#
                  • 4...Sc7
                    • 5.Sxc7#
                  • 4...Sb8
                    • 5.Sc7#
                  • 4...Sb6
                    • 5.Sxb6#
                  • 4...Sd6
                    • 5.Sb6#
                  • 4...Sa7
                    • 5.Sb6#
                  • 4...Se7
                    • 5.Sb6#
            • 3.Kf3
              • threat
                • 4.Kxg3
                  • 4...Sb4
                    • 5.Sc7#
                  • 4...Sc5
                    • 5.Sc7#
                  • 4...Sc7
                    • 5.Sxc7#
                  • 4...Sb8
                    • 5.Sc7#
                  • 4...Sb6
                    • 5.Sxb6#
                  • 4...Sd6
                    • 5.Sb6#
                  • 4...Sa7
                    • 5.Sb6#
                  • 4...Se7
                    • 5.Sb6#
                • 4.Kg2
                  • 4...Sb4
                    • 5.Sc7#
                  • 4...Sc5
                    • 5.Sc7#
                  • 4...Sc7
                    • 5.Sxc7#
                  • 4...Sb8
                    • 5.Sc7#
                  • 4...Sb6
                    • 5.Sxb6#
                  • 4...Sd6
                    • 5.Sb6#
                  • 4...Sa7
                    • 5.Sb6#
                  • 4...Se7
                    • 5.Sb6#
              • 3...g2
                • 4.Kxg2
                  • 4...Sb4
                    • 5.Sc7#
                  • 4...Sc5
                    • 5.Sc7#
                  • 4...Sc7
                    • 5.Sxc7#
                  • 4...Sb8
                    • 5.Sc7#
                  • 4...Sb6
                    • 5.Sxb6#
                  • 4...Sd6
                    • 5.Sb6#
                  • 4...Sa7
                    • 5.Sb6#
                  • 4...Se7
                    • 5.Sb6#
      • 1...e1Q+
        • 2.Kxe1
          • threat
            • 3.Kf1
              • 3...g3
                • 4.Kg2
                  • 4...Sb4
                    • 5.Sc7#
                  • 4...Sc5
                    • 5.Sc7#
                  • 4...Sc7
                    • 5.Sxc7#
                  • 4...Sb8
                    • 5.Sc7#
                  • 4...Sb6
                    • 5.Sxb6#
                  • 4...Sd6
                    • 5.Sb6#
                  • 4...Sa7
                    • 5.Sb6#
                  • 4...Se7
                    • 5.Sb6#
            • 3.Kf2
              • threat
                • 4.Kg3
                  • 4...Sb4
                    • 5.Sc7#
                  • 4...Sc5
                    • 5.Sc7#
                  • 4...Sc7
                    • 5.Sxc7#
                  • 4...Sb8
                    • 5.Sc7#
                  • 4...Sb6
                    • 5.Sxb6#
                  • 4...Sd6
                    • 5.Sb6#
                  • 4...Sa7
                    • 5.Sb6#
                  • 4...Se7
                    • 5.Sb6#
              • 3...g3+
                • 4.Kxg3
                  • 4...Sb4
                    • 5.Sc7#
                  • 4...Sc5
                    • 5.Sc7#
                  • 4...Sc7
                    • 5.Sxc7#
                  • 4...Sb8
                    • 5.Sc7#
                  • 4...Sb6
                    • 5.Sxb6#
                  • 4...Sd6
                    • 5.Sb6#
                  • 4...Sa7
                    • 5.Sb6#
                  • 4...Se7
                    • 5.Sb6#
                • 4.Kg2
                  • 4...Sb4
                    • 5.Sc7#
                  • 4...Sc5
                    • 5.Sc7#
                  • 4...Sc7
                    • 5.Sxc7#
                  • 4...Sb8
                    • 5.Sc7#
                  • 4...Sb6
                    • 5.Sxb6#
                  • 4...Sd6
                    • 5.Sb6#
                  • 4...Sa7
                    • 5.Sb6#
                  • 4...Se7
                    • 5.Sb6#
          • 2...g3
            • 3.Kf1
              • threat
                • 4.Kg2
                  • 4...Sb4
                    • 5.Sc7#
                  • 4...Sc5
                    • 5.Sc7#
                  • 4...Sc7
                    • 5.Sxc7#
                  • 4...Sb8
                    • 5.Sc7#
                  • 4...Sb6
                    • 5.Sxb6#
                  • 4...Sd6
                    • 5.Sb6#
                  • 4...Sa7
                    • 5.Sb6#
                  • 4...Se7
                    • 5.Sb6#
              • 3...g2+
                • 4.Kxg2
                  • 4...Sb4
                    • 5.Sc7#
                  • 4...Sc5
                    • 5.Sc7#
                  • 4...Sc7
                    • 5.Sxc7#
                  • 4...Sb8
                    • 5.Sc7#
                  • 4...Sb6
                    • 5.Sxb6#
                  • 4...Sd6
                    • 5.Sb6#
                  • 4...Sa7
                    • 5.Sb6#
                  • 4...Se7
                    • 5.Sb6#
                • 4.Kg1
                  • 4...Sb4
                    • 5.Sc7#
                  • 4...Sc5
                    • 5.Sc7#
                  • 4...Sc7
                    • 5.Sxc7#
                  • 4...Sb8
                    • 5.Sc7#
                  • 4...Sb6
                    • 5.Sxb6#
                  • 4...Sd6
                    • 5.Sb6#
                  • 4...Sa7
                    • 5.Sb6#
                  • 4...Se7
                    • 5.Sb6#
      • 1...e1B+
        • 2.Kxe1
          • threat
            • 3.Kf1
              • 3...g3
                • 4.Kg2
                  • 4...Sb4
                    • 5.Sc7#
                  • 4...Sc5
                    • 5.Sc7#
                  • 4...Sc7
                    • 5.Sxc7#
                  • 4...Sb8
                    • 5.Sc7#
                  • 4...Sb6
                    • 5.Sxb6#
                  • 4...Sd6
                    • 5.Sb6#
                  • 4...Sa7
                    • 5.Sb6#
                  • 4...Se7
                    • 5.Sb6#
            • 3.Kf2
              • threat
                • 4.Kg3
                  • 4...Sb4
                    • 5.Sc7#
                  • 4...Sc5
                    • 5.Sc7#
                  • 4...Sc7
                    • 5.Sxc7#
                  • 4...Sb8
                    • 5.Sc7#
                  • 4...Sb6
                    • 5.Sxb6#
                  • 4...Sd6
                    • 5.Sb6#
                  • 4...Sa7
                    • 5.Sb6#
                  • 4...Se7
                    • 5.Sb6#
              • 3...g3+
                • 4.Kxg3
                  • 4...Sb4
                    • 5.Sc7#
                  • 4...Sc5
                    • 5.Sc7#
                  • 4...Sc7
                    • 5.Sxc7#
                  • 4...Sb8
                    • 5.Sc7#
                  • 4...Sb6
                    • 5.Sxb6#
                  • 4...Sd6
                    • 5.Sb6#
                  • 4...Sa7
                    • 5.Sb6#
                  • 4...Se7
                    • 5.Sb6#
                • 4.Kg2
                  • 4...Sb4
                    • 5.Sc7#
                  • 4...Sc5
                    • 5.Sc7#
                  • 4...Sc7
                    • 5.Sxc7#
                  • 4...Sb8
                    • 5.Sc7#
                  • 4...Sb6
                    • 5.Sxb6#
                  • 4...Sd6
                    • 5.Sb6#
                  • 4...Sa7
                    • 5.Sb6#
                  • 4...Se7
                    • 5.Sb6#
          • 2...g3
            • 3.Kf1
              • threat
                • 4.Kg2
                  • 4...Sb4
                    • 5.Sc7#
                  • 4...Sc5
                    • 5.Sc7#
                  • 4...Sc7
                    • 5.Sxc7#
                  • 4...Sb8
                    • 5.Sc7#
                  • 4...Sb6
                    • 5.Sxb6#
                  • 4...Sd6
                    • 5.Sb6#
                  • 4...Sa7
                    • 5.Sb6#
                  • 4...Se7
                    • 5.Sb6#
              • 3...g2+
                • 4.Kxg2
                  • 4...Sb4
                    • 5.Sc7#
                  • 4...Sc5
                    • 5.Sc7#
                  • 4...Sc7
                    • 5.Sxc7#
                  • 4...Sb8
                    • 5.Sc7#
                  • 4...Sb6
                    • 5.Sxb6#
                  • 4...Sd6
                    • 5.Sb6#
                  • 4...Sa7
                    • 5.Sb6#
                  • 4...Se7
                    • 5.Sb6#
                • 4.Kg1
                  • 4...Sb4
                    • 5.Sc7#
                  • 4...Sc5
                    • 5.Sc7#
                  • 4...Sc7
                    • 5.Sxc7#
                  • 4...Sb8
                    • 5.Sc7#
                  • 4...Sb6
                    • 5.Sxb6#
                  • 4...Sd6
                    • 5.Sb6#
                  • 4...Sa7
                    • 5.Sb6#
                  • 4...Se7
                    • 5.Sb6#
      • 1...g3+
        • 2.Kxe2
          • threat
            • 3.Kf1
              • threat
                • 4.Kg2
                  • 4...Sb4
                    • 5.Sc7#
                  • 4...Sc5
                    • 5.Sc7#
                  • 4...Sc7
                    • 5.Sxc7#
                  • 4...Sb8
                    • 5.Sc7#
                  • 4...Sb6
                    • 5.Sxb6#
                  • 4...Sd6
                    • 5.Sb6#
                  • 4...Sa7
                    • 5.Sb6#
                  • 4...Se7
                    • 5.Sb6#
              • 3...g2+
                • 4.Kxg2
                  • 4...Sb4
                    • 5.Sc7#
                  • 4...Sc5
                    • 5.Sc7#
                  • 4...Sc7
                    • 5.Sxc7#
                  • 4...Sb8
                    • 5.Sc7#
                  • 4...Sb6
                    • 5.Sxb6#
                  • 4...Sd6
                    • 5.Sb6#
                  • 4...Sa7
                    • 5.Sb6#
                  • 4...Se7
                    • 5.Sb6#
                • 4.Kg1
                  • 4...Sb4
                    • 5.Sc7#
                  • 4...Sc5
                    • 5.Sc7#
                  • 4...Sc7
                    • 5.Sxc7#
                  • 4...Sb8
                    • 5.Sc7#
                  • 4...Sb6
                    • 5.Sxb6#
                  • 4...Sd6
                    • 5.Sb6#
                  • 4...Sa7
                    • 5.Sb6#
                  • 4...Se7
                    • 5.Sb6#
            • 3.Kf3
              • threat
                • 4.Kxg3
                  • 4...Sb4
                    • 5.Sc7#
                  • 4...Sc5
                    • 5.Sc7#
                  • 4...Sc7
                    • 5.Sxc7#
                  • 4...Sb8
                    • 5.Sc7#
                  • 4...Sb6
                    • 5.Sxb6#
                  • 4...Sd6
                    • 5.Sb6#
                  • 4...Sa7
                    • 5.Sb6#
                  • 4...Se7
                    • 5.Sb6#
                • 4.Kg2
                  • 4...Sb4
                    • 5.Sc7#
                  • 4...Sc5
                    • 5.Sc7#
                  • 4...Sc7
                    • 5.Sxc7#
                  • 4...Sb8
                    • 5.Sc7#
                  • 4...Sb6
                    • 5.Sxb6#
                  • 4...Sd6
                    • 5.Sb6#
                  • 4...Sa7
                    • 5.Sb6#
                  • 4...Se7
                    • 5.Sb6#
              • 3...g2
                • 4.Kxg2
                  • 4...Sb4
                    • 5.Sc7#
                  • 4...Sc5
                    • 5.Sc7#
                  • 4...Sc7
                    • 5.Sxc7#
                  • 4...Sb8
                    • 5.Sc7#
                  • 4...Sb6
                    • 5.Sxb6#
                  • 4...Sd6
                    • 5.Sb6#
                  • 4...Sa7
                    • 5.Sb6#
                  • 4...Se7
                    • 5.Sb6#
          • 2...g2
            • 3.Kf2
              • threat
                • 4.Kxg2
                  • 4...Sb4
                    • 5.Sc7#
                  • 4...Sc5
                    • 5.Sc7#
                  • 4...Sc7
                    • 5.Sxc7#
                  • 4...Sb8
                    • 5.Sc7#
                  • 4...Sb6
                    • 5.Sxb6#
                  • 4...Sd6
                    • 5.Sb6#
                  • 4...Sa7
                    • 5.Sb6#
                  • 4...Se7
                    • 5.Sb6#
                • 4.Kg1
                  • 4...Sb4
                    • 5.Sc7#
                  • 4...Sc5
                    • 5.Sc7#
                  • 4...Sc7
                    • 5.Sxc7#
                  • 4...Sb8
                    • 5.Sc7#
                  • 4...Sb6
                    • 5.Sxb6#
                  • 4...Sd6
                    • 5.Sb6#
                  • 4...Sa7
                    • 5.Sb6#
                  • 4...Se7
                    • 5.Sb6#
              • 3...g1Q+
                • 4.Kxg1
                  • 4...Sb4
                    • 5.Sc7#
                  • 4...Sc5
                    • 5.Sc7#
                  • 4...Sc7
                    • 5.Sxc7#
                  • 4...Sb8
                    • 5.Sc7#
                  • 4...Sb6
                    • 5.Sxb6#
                  • 4...Sd6
                    • 5.Sb6#
                  • 4...Sa7
                    • 5.Sb6#
                  • 4...Se7
                    • 5.Sb6#
              • 3...g1B+
                • 4.Kxg1
                  • 4...Sb4
                    • 5.Sc7#
                  • 4...Sc5
                    • 5.Sc7#
                  • 4...Sc7
                    • 5.Sxc7#
                  • 4...Sb8
                    • 5.Sc7#
                  • 4...Sb6
                    • 5.Sxb6#
                  • 4...Sd6
                    • 5.Sb6#
                  • 4...Sa7
                    • 5.Sb6#
                  • 4...Se7
                    • 5.Sb6#
              • 3...g1S
                • 4.Kxg1
                  • 4...Sb4
                    • 5.Sc7#
                  • 4...Sc5
                    • 5.Sc7#
                  • 4...Sc7
                    • 5.Sxc7#
                  • 4...Sb8
                    • 5.Sc7#
                  • 4...Sb6
                    • 5.Sxb6#
                  • 4...Sd6
                    • 5.Sb6#
                  • 4...Sa7
                    • 5.Sb6#
                  • 4...Se7
                    • 5.Sb6#
              • 3...g1R
                • 4.Kxg1
                  • 4...Sb4
                    • 5.Sc7#
                  • 4...Sc5
                    • 5.Sc7#
                  • 4...Sc7
                    • 5.Sxc7#
                  • 4...Sb8
                    • 5.Sc7#
                  • 4...Sb6
                    • 5.Sxb6#
                  • 4...Sd6
                    • 5.Sb6#
                  • 4...Sa7
                    • 5.Sb6#
                  • 4...Se7
                    • 5.Sb6#
      • 1...e1S
        • 2.Kxe1
          • threat
            • 3.Kf1
              • 3...g3
                • 4.Kg2
                  • 4...Sb4
                    • 5.Sc7#
                  • 4...Sc5
                    • 5.Sc7#
                  • 4...Sc7
                    • 5.Sxc7#
                  • 4...Sb8
                    • 5.Sc7#
                  • 4...Sb6
                    • 5.Sxb6#
                  • 4...Sd6
                    • 5.Sb6#
                  • 4...Sa7
                    • 5.Sb6#
                  • 4...Se7
                    • 5.Sb6#
            • 3.Kf2
              • threat
                • 4.Kg3
                  • 4...Sb4
                    • 5.Sc7#
                  • 4...Sc5
                    • 5.Sc7#
                  • 4...Sc7
                    • 5.Sxc7#
                  • 4...Sb8
                    • 5.Sc7#
                  • 4...Sb6
                    • 5.Sxb6#
                  • 4...Sd6
                    • 5.Sb6#
                  • 4...Sa7
                    • 5.Sb6#
                  • 4...Se7
                    • 5.Sb6#
              • 3...g3+
                • 4.Kxg3
                  • 4...Sb4
                    • 5.Sc7#
                  • 4...Sc5
                    • 5.Sc7#
                  • 4...Sc7
                    • 5.Sxc7#
                  • 4...Sb8
                    • 5.Sc7#
                  • 4...Sb6
                    • 5.Sxb6#
                  • 4...Sd6
                    • 5.Sb6#
                  • 4...Sa7
                    • 5.Sb6#
                  • 4...Se7
                    • 5.Sb6#
                • 4.Kg2
                  • 4...Sb4
                    • 5.Sc7#
                  • 4...Sc5
                    • 5.Sc7#
                  • 4...Sc7
                    • 5.Sxc7#
                  • 4...Sb8
                    • 5.Sc7#
                  • 4...Sb6
                    • 5.Sxb6#
                  • 4...Sd6
                    • 5.Sb6#
                  • 4...Sa7
                    • 5.Sb6#
                  • 4...Se7
                    • 5.Sb6#
          • 2...g3
            • 3.Kf1
              • threat
                • 4.Kg2
                  • 4...Sb4
                    • 5.Sc7#
                  • 4...Sc5
                    • 5.Sc7#
                  • 4...Sc7
                    • 5.Sxc7#
                  • 4...Sb8
                    • 5.Sc7#
                  • 4...Sb6
                    • 5.Sxb6#
                  • 4...Sd6
                    • 5.Sb6#
                  • 4...Sa7
                    • 5.Sb6#
                  • 4...Se7
                    • 5.Sb6#
              • 3...g2+
                • 4.Kxg2
                  • 4...Sb4
                    • 5.Sc7#
                  • 4...Sc5
                    • 5.Sc7#
                  • 4...Sc7
                    • 5.Sxc7#
                  • 4...Sb8
                    • 5.Sc7#
                  • 4...Sb6
                    • 5.Sxb6#
                  • 4...Sd6
                    • 5.Sb6#
                  • 4...Sa7
                    • 5.Sb6#
                  • 4...Se7
                    • 5.Sb6#
                • 4.Kg1
                  • 4...Sb4
                    • 5.Sc7#
                  • 4...Sc5
                    • 5.Sc7#
                  • 4...Sc7
                    • 5.Sxc7#
                  • 4...Sb8
                    • 5.Sc7#
                  • 4...Sb6
                    • 5.Sxb6#
                  • 4...Sd6
                    • 5.Sb6#
                  • 4...Sa7
                    • 5.Sb6#
                  • 4...Se7
                    • 5.Sb6#
      • 1...e1R
        • 2.Kxe1
          • threat
            • 3.Kf1
              • 3...g3
                • 4.Kg2
                  • 4...Sb4
                    • 5.Sc7#
                  • 4...Sc5
                    • 5.Sc7#
                  • 4...Sc7
                    • 5.Sxc7#
                  • 4...Sb8
                    • 5.Sc7#
                  • 4...Sb6
                    • 5.Sxb6#
                  • 4...Sd6
                    • 5.Sb6#
                  • 4...Sa7
                    • 5.Sb6#
                  • 4...Se7
                    • 5.Sb6#
            • 3.Kf2
              • threat
                • 4.Kg3
                  • 4...Sb4
                    • 5.Sc7#
                  • 4...Sc5
                    • 5.Sc7#
                  • 4...Sc7
                    • 5.Sxc7#
                  • 4...Sb8
                    • 5.Sc7#
                  • 4...Sb6
                    • 5.Sxb6#
                  • 4...Sd6
                    • 5.Sb6#
                  • 4...Sa7
                    • 5.Sb6#
                  • 4...Se7
                    • 5.Sb6#
              • 3...g3+
                • 4.Kxg3
                  • 4...Sb4
                    • 5.Sc7#
                  • 4...Sc5
                    • 5.Sc7#
                  • 4...Sc7
                    • 5.Sxc7#
                  • 4...Sb8
                    • 5.Sc7#
                  • 4...Sb6
                    • 5.Sxb6#
                  • 4...Sd6
                    • 5.Sb6#
                  • 4...Sa7
                    • 5.Sb6#
                  • 4...Se7
                    • 5.Sb6#
                • 4.Kg2
                  • 4...Sb4
                    • 5.Sc7#
                  • 4...Sc5
                    • 5.Sc7#
                  • 4...Sc7
                    • 5.Sxc7#
                  • 4...Sb8
                    • 5.Sc7#
                  • 4...Sb6
                    • 5.Sxb6#
                  • 4...Sd6
                    • 5.Sb6#
                  • 4...Sa7
                    • 5.Sb6#
                  • 4...Se7
                    • 5.Sb6#
          • 2...g3
            • 3.Kf1
              • threat
                • 4.Kg2
                  • 4...Sb4
                    • 5.Sc7#
                  • 4...Sc5
                    • 5.Sc7#
                  • 4...Sc7
                    • 5.Sxc7#
                  • 4...Sb8
                    • 5.Sc7#
                  • 4...Sb6
                    • 5.Sxb6#
                  • 4...Sd6
                    • 5.Sb6#
                  • 4...Sa7
                    • 5.Sb6#
                  • 4...Se7
                    • 5.Sb6#
              • 3...g2+
                • 4.Kxg2
                  • 4...Sb4
                    • 5.Sc7#
                  • 4...Sc5
                    • 5.Sc7#
                  • 4...Sc7
                    • 5.Sxc7#
                  • 4...Sb8
                    • 5.Sc7#
                  • 4...Sb6
                    • 5.Sxb6#
                  • 4...Sd6
                    • 5.Sb6#
                  • 4...Sa7
                    • 5.Sb6#
                  • 4...Se7
                    • 5.Sb6#
                • 4.Kg1
                  • 4...Sb4
                    • 5.Sc7#
                  • 4...Sc5
                    • 5.Sc7#
                  • 4...Sc7
                    • 5.Sxc7#
                  • 4...Sb8
                    • 5.Sc7#
                  • 4...Sb6
                    • 5.Sxb6#
                  • 4...Sd6
                    • 5.Sb6#
                  • 4...Sa7
                    • 5.Sb6#
                  • 4...Se7
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FEATURES

NOT CLASSIFIED
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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).