MESON Chess Problem Database

Problem Display
PID: 200378 (3R2Bk/4P1rP/4PK2/6P1/7P/8/8/7Q w - - 0 1)

de Jong, Leonard Nicholaas

Op de Hoogte, 1912

3R2Bk/4P1rP/4PK2/6P1/7P/8/8/7Q

#2

9 + 2

SOLUTION

  • SOUND
  • Sets
    • 1...Rxh7
      • 2.Bf7#
    • 1...Rxg8
      • 2.hxg8Q#
  • Tries
    • 1.Bf7+?
      • 1...Rg8
        • 2.hxg8Q#
      • 1...Kxh7!
  • Keys
    • 1.Qa1!
      • 1...Rg6+
        • 2.Kxg6#
      • 1...Rf7+
        • 2.Kxf7#
      • 1...Rxg5
        • 2.Kxg5#
      • 1...Rxe7
        • 2.Kxe7#
      • 1...Rxh7
        • 2.Bf7#
      • 1...Rxg8
        • 2.hxg8Q#

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 0
    • ADDED MATES = 4
    • REMOVED MATES = 0
  • Sets
    • R(a);N_GUARD,SBLOCK,XP(G)::R(H)+B(I)
    • R(a);OGATE,P_SPINR(a),XB(I)::PXR(a)=Q
  • Tries
    • Try
      • B(I);CHECK
      • Vars
        • R(a);OGATE,P_SPINR(a)::PXR(a)=Q
      • Refutation
        • K(b);P-FLIGHT,XP(G)
  • Actual
    • Q(A);
    • Vars
      • R(a);CHECK::QAB(A)+K(E),XR(a)
      • R(a);XP(C)::QAB(A)+K(E),XR(a)
      • R(a);XP(F)::QAB(A)+K(E),XR(a)
      • R(a);N_GUARD,SBLOCK,XP(G)::R(H)+B(I)
      • R(a);OGATE,P_SPINR(a),XB(I)::PXR(a)=Q
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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).