MESON Chess Problem Database

Problem Display
PID: 181139 (3R4/2Pq2B1/N2kN1P1/1p1P2P1/1pr1p2K/1Q2P3/8/8 w - - 0 1)

van Dijk, Johannes

Schaakblad, 1904

3R4/2Pq2B1/N2kN1P1/1p1P2P1/1pr1p2K/1Q2P3/8/8

#2

11 + 6

6490 yacpdb 2018

SOLUTION

  • SOUND
  • Sets
    • 1...Ke7
      • 2.Bf8#
    • 1...Qxd8
      • 2.cxd8Q#
    • 1...Rd4
      • 2.c8S#
  • Tries
    • 1.Qxc4?
      • threat
        • 2.Qc5#
        • 2.c8S#
      • 1...Ke7
        • 2.Bf8#
      • 1...Qxd8
        • 2.cxd8Q#
      • 1...bxc4!
  • Keys
    • 1.Sd4!
      • 1...Kxd5
        • 2.Rxd7#
      • 1...Ke7
        • 2.Bf8#
      • 1...Qxd8
        • 2.cxd8Q#
      • 1...Rxd4
        • 2.c8S#
      • 1...Rxc7
        • 2.Sf5#
      • 1...Rc1
        • 2.Sf5#
      • 1...Rc2
        • 2.Sf5#
      • 1...Rc3
        • 2.Sf5#
      • 1...Rc5
        • 2.Sf5#
      • 1...Rc6
        • 2.Sf5#

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 0
    • ADDED MATES = 7
    • REMOVED MATES = 0
  • Sets
    • K(e);N_SPINQ(f),S_FLIGHT::B(J)
    • Q(f);N_SPINQ(f),OGATE,P_PINP(E),XR(K)::PXQ(f)=Q
    • R(b);N_GUARD::P=S
  • Tries
    • Try
      • Q(A);XR(b)
      • Threat
        • DUALS(2)
      • Vars
        • K(e);N_SPINQ(f),S_FLIGHT::B(J)
        • Q(f);N_SPINQ(f),OGATE,P_PINP(E),XR(K)::PXQ(f)=Q
      • Refutation
        • P(d);XQ(A)
  • Actual
    • S(G);
    • Vars
      • K(e);P-FLIGHT,P_SPINR(b),XP(D)::R(K),XQ(f)
      • K(e);N_SPINQ(f),S_FLIGHT::B(J)
      • Q(f);N_SPINQ(f),OGATE,P_PINP(E),XR(K)::PXQ(f)=Q
      • R(b);N_GUARD,XS(G)::P=S
      • R(b);XP(I)::S(G)
      • R(b);::S(G)
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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).