MESON Chess Problem Database

Problem Display
PID: 170926 (r6k/1P1pKP2/4BPP1/5RP1/qr6/2p5/2Q3b1/8 w - - 0 1)

ten Cate, Pieter

Problemisten, 1947

r6k/1P1pKP2/4BPP1/5RP1/qr6/2p5/2Q3b1/8

#2

9 + 7

6490 yacpdb 2018

SOLUTION

  • SOUND
  • Sets
    • 1...Ra5
      • 2.f8Q#
      • 2.f8R#
    • 1...Ra6
      • 2.f8Q#
      • 2.f8R#
    • 1...Ra7
      • 2.f8Q#
      • 2.f8R#
    • 1...Rc8
      • 2.bxc8Q#
      • 2.bxc8R#
    • 1...Re8+
      • 2.fxe8Q#
      • 2.fxe8R#
    • 1...Rg8
      • 2.fxg8Q#
      • 2.fxg8R#
    • 1...Be4
      • 2.Qh2#
  • Tries
    • 1.bxa8Q+?
      • 1...Rb8
        • 2.Qxb8#
      • 1...Bxa8
        • 2.f8Q#
        • 2.f8R#
      • 1...Qxa8!
    • 1.bxa8R+?
      • 1...Rb8
        • 2.Rxb8#
      • 1...Bxa8
        • 2.f8Q#
        • 2.f8R#
      • 1...Qxa8!
  • Keys
    • 1.Ra5!
      • threat
        • 2.g7#
      • 1...Re8+
        • 2.fxe8Q#
        • 2.fxe8R#
      • 1...Qxc2
        • 2.Rxa8#
      • 1...Re4
        • 2.bxa8Q#
        • 2.bxa8R#
      • 1...Rg8
        • 2.fxg8Q#
        • 2.fxg8R#
      • 1...Be4
        • 2.Qh2#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 1
    • REMOVED MATES = 0
  • Sets
    • R(f);N_GUARD::P=Q
    • R(f);OGATE::PXR(f)=Q
    • R(f);CHECK,OGATE::PXR(f)=Q
    • B(a);OGATE::QAR(A)
  • Tries
    • Try
      • P(G);CHECK,XR(f)
      • Vars
        • R(d);N_GUARD,P_SPINR(d)::QAR(G),XR(d)
        • B(a);XQ(G)::P=Q
      • Refutation
        • Q(c);XQ(G)
    • Try
      • P(G);CHECK,XR(f)
      • Vars
        • R(d);N_GUARD,P_SPINR(d)::R(G),XR(d)
        • B(a);XR(G)::P=Q
      • Refutation
        • Q(c);XR(G)
  • Actual
    • R(B);
    • Threat
      • P(F)
    • Vars
      • R(f);CHECK,OGATE::PXR(f)=Q
      • Q(c);N_GUARD,XQ(A)::R(B),XR(f)
      • R(d);N_GUARD,P_PINB(D),S_CUTB(a)::PXR(f)=Q
      • R(f);OGATE::PXR(f)=Q
      • B(a);OGATE::QAR(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).