MESON Chess Problem Database

Problem Display
PID: 199409 (7r/3P1p1P/p1Bk1B2/P2b1Pp1/KP1N4/1pQ2P2/8/8 w - - 0 1)

van der Werf, JD

Op de Hoogte, 1908

7r/3P1p1P/p1Bk1B2/P2b1Pp1/KP1N4/1pQ2P2/8/8

#2

11 + 7

SOLUTION

  • SOUND
  • Sets
    • 1...Rxh7
      • 2.d8Q#
    • 1...Re8
      • 2.dxe8S#
    • 1...Bxc6+
      • 2.Qxc6#
  • Tries
    • 1.Bxd5?
      • threat
        • 2.Qc6#
      • 1...Kxd5
        • 2.Qc5#
        • 2.Qc6#
      • 1...Kxd7
        • 2.Qc6#
      • 1...Rc8!
    • 1.Qe1?
      • threat
        • 2.Qg3#
        • 2.Qe5#
      • 1...Kc7
        • 2.Qg3#
        • 2.Qe5#
      • 1...Re8
        • 2.dxe8S#
      • 1...Be4
        • 2.Qg3#
      • 1...Bxc6+!
    • 1.d8R+?
      • 1...Kc7
        • 2.Bxd5#
      • 1...Rxd8!
  • Keys
    • 1.Qd2!
      • threat
        • 2.Qh2#
      • 1...Bxc6+
        • 2.Sb5#
      • 1...Kc7
        • 2.Qh2#
      • 1...Rxh7
        • 2.d8Q#
      • 1...Re8
        • 2.dxe8S#
      • 1...g4
        • 2.Qf4#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 1
    • ADDED MATES = 2
    • REMOVED MATES = 0
  • Sets
    • R(g);N_GUARD,XP(K)::P=Q
    • R(g);OGATE::PXR(g)=S
    • B(b);CHECK,OGATE,XB(H)::QAR1(A),XB(b)
  • Tries
    • Try
      • B(H);XB(b)
      • Threat
        • QAR1(A)
      • Vars
        • K(e);P-FLIGHT,XP(J)::QAB1(A)
      • Refutation
        • R(g);
    • Try
      • Q(A);
      • Threat
        • DUALS(2)
      • Vars
        • R(g);OGATE::PXR(g)=S
        • B(b);::QAB(A)
      • Refutation
        • B(b);CHECK,XB(H)
    • Try
      • P(J);CHECK
      • Vars
        • K(e);S_FLIGHT::QAR(A)+B(H),XB(b)
      • Refutation
        • R(g);XR(J)
  • Actual
    • Q(A);
    • Threat
      • QAB(A)
    • Vars
      • B(b);CHECK,SBLOCK,XB(H)::QAR(A)+S(E),DCHECK
      • K(e);S_FLIGHT::QAB(A)
      • R(g);N_GUARD,XP(K)::P=Q
      • R(g);OGATE::PXR(g)=S
      • P(c);N_GUARD::QAB(A)
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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).