MESON Chess Problem Database

Problem Display
PID: 79900 (r3k3/P2p1pB1/1P1P1P2/3P2P1/8/8/2p1K3/2Q5 w q - 0 1)

Zgerski, Gennadi Bronislavovich

Variantim, 2008

r3k3/P2p1pB1/1P1P1P2/3P2P1/8/8/2p1K3/2Q5

#2

9 + 5

SOLUTION

  • SOUND
  • Sets
    • 1...Rb8
      • 2.axb8Q#
      • 2.axb8R#
    • 1...Rd8
      • 2.Qe3#
    • 1...0-0-0
      • 2.a8Q#
  • Tries
    • 1.Qh1?
      • threat
        • 2.Qh8#
      • 1...Kd8
        • 2.Qh8#
      • 1...0-0-0
        • 2.a8Q#
      • 1...c1S+!
    • 1.Qxc2?
      • 1...Rxa7
        • 2.Qc8#
      • 1...Rb8
        • 2.axb8Q#
        • 2.axb8R#
      • 1...Rc8
        • 2.Qxc8#
      • 1...Rd8
        • 2.Qe4#
      • 1...Kd8!
  • Keys
    • 1.b7!
      • threat
        • 2.bxa8Q#
        • 2.bxa8R#
      • 1...Kd8
        • 2.bxa8Q#
        • 2.bxa8R#
      • 1...Rxa7
        • 2.b8Q#
        • 2.b8R#
      • 1...Rb8
        • 2.axb8Q#
        • 2.axb8R#
      • 1...Rc8
        • 2.bxc8Q#
        • 2.bxc8R#
      • 1...Rd8
        • 2.Qe3#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 0
    • REMOVED MATES = 1
  • Sets
    • R(d);OGATE::PXR(d)=Q
    • R(d);SBLOCK::QAR(A)
    • K(e);0-0-0,OGATE,P_SPINP(a)::P=Q
  • Tries
    • Try
      • Q(A);
      • Threat
        • QAR(A)
      • Vars
        • K(e);P-FLIGHT::QAR(A)
        • K(e);0-0-0,OGATE::P=Q
      • Refutation
        • P(a);CHECK
    • Try
      • Q(A);XP(a)
      • Vars
        • R(d);N_GUARD,XP(H)::QAR2(A)
        • R(d);OGATE::PXR(d)=Q
        • R(d);N_GUARD::QAR2(A),XR(d)
        • R(d);SBLOCK::QAR(A)
      • Refutation
        • K(e);P-FLIGHT
  • Actual
    • P(E);
    • Threat
      • PXR(d)=Q
    • Vars
      • K(e);P-FLIGHT::PXR(d)=Q
      • R(d);N_GUARD,XP(H)::P=Q
      • R(d);OGATE::PXR(d)=Q
      • R(d);SBLOCK::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).