MESON Chess Problem Database

Problem Display
PID: 229087 (2n4K/n1Q5/3Pkp1p/1p6/1N2B1Nq/4R3/4r3/2b5 w - - 0 1)

van Dijk, Johannes

Der Tijd, 1926

2n4K/n1Q5/3Pkp1p/1p6/1N2B1Nq/4R3/4r3/2b5

#2

7 + 9

6490 yacpdb 2020

SOLUTION

  • SOUND
  • Sets
    • 1...Rd2
      • 2.Bb1#
      • 2.Bc2#
      • 2.Bd3#
      • 2.Bg6#
      • 2.Bh7#
    • 1...Sb6
      • 2.Qe7#
    • 1...Se7
      • 2.Qxe7#
    • 1...f5
      • 2.Bd5#
  • Tries
    • 1.Bc6+?
      • 1...Rxe3
        • 2.Qd7#
      • 1...Bxe3
        • 2.Qd7#
      • 1...Kf5!
  • Keys
    • 1.d7!
      • threat
        • 2.d8S#
      • 1...Ke7
        • 2.dxc8Q#
      • 1...Kf7
        • 2.dxc8Q#
      • 1...Rd2
        • 2.Bg6#
      • 1...Sc6
        • 2.dxc8Q#
        • 2.dxc8B#
      • 1...f5
        • 2.Bd5#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 2
  • Sets
    • S(i);N_GUARD::QAR1(F)
    • S(i);N_GUARD::QAR1(F),XS(i)
    • P(f);SBLOCK::R(A)+B(C),DCHECK
  • Tries
    • Try
      • B(C);CHECK
      • Vars
        • R(b);XR(A)::QAB1(F)
        • B(a);XR(A)::QAB1(F)
      • Refutation
        • K(e);S_FLIGHT
  • Actual
    • P(E);
    • Threat
      • P=S
    • Vars
      • K(e);P-FLIGHT::PXS(i)=Q
      • K(e);S_FLIGHT::PXS(i)=Q
      • R(b);N_GUARD,S_CUTB(a)::R(A)+B(C)
      • S(h);N_GUARD::PXS(i)=Q
      • P(f);SBLOCK::R(A)+B(C),DCHECK
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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).