MESON Chess Problem Database

Problem Display
PID: 205840 (1rk5/1p6/1Pp5/2p5/8/Q1p5/8/K2R4 w - - 0 1)

Degener, Udo

Troll, 2019

1rk5/1p6/1Pp5/2p5/8/Q1p5/8/K2R4

#2

4 + 6

SOLUTION

  • SOUND
  • Sets
    • 1...Ra8
      • 2.Qxa8#
    • 1...c2
      • 2.Qh3#
    • 1...c4
      • 2.Qf8#
  • Tries
    • 1.Kb1?
      • 1...Ra8
        • 2.Qxa8#
      • 1...c4
        • 2.Qf8#
      • 1...c2+!
    • 1.Rd2?
      • 1...Ra8
        • 2.Qxa8#
      • 1...c2
        • 2.Qh3#
      • 1...c4
        • 2.Qf8#
      • 1...cxd2!
    • 1.Rd3?
      • 1...Ra8
        • 2.Qxa8#
      • 1...c4
        • 2.Qf8#
      • 1...c2!
    • 1.Rd4?
      • 1...Ra8
        • 2.Qxa8#
      • 1...c2
        • 2.Qh3#
      • 1...c4
        • 2.Qf8#
      • 1...cxd4!
    • 1.Rd5?
      • 1...Ra8
        • 2.Qxa8#
      • 1...c2
        • 2.Qh3#
      • 1...c4
        • 2.Qf8#
      • 1...cxd5!
    • 1.Rd6?
      • 1...Ra8
        • 2.Qxa8#
      • 1...c2
        • 2.Qh3#
      • 1...c4!
    • 1.Qa2?
      • threat
        • 2.Qe6#
        • 2.Qg8#
      • 1...Ra8
        • 2.Qxa8#
      • 1...c4!
    • 1.Qa4?
      • threat
        • 2.Qg4#
      • 1...Ra8
        • 2.Qxa8#
      • 1...c4!
    • 1.Qa5?
      • 1...Ra8
        • 2.Qxa8#
      • 1...c4
        • 2.Qf5#
      • 1...c2!
  • Keys
    • 1.Ka2!
      • 1...Ra8
        • 2.Qxa8#
      • 1...c2
        • 2.Qh3#
      • 1...c4
        • 2.Qf8#

FEATURES

  • Static
    • TYPE = WAITER
    • CHANGED MATES = 0
    • ADDED MATES = 0
    • REMOVED MATES = 0
  • Sets
    • R(e);OGATEB,P_PINQ(C)::QAR2(C),XR(e)
    • P(a);OGATE::QAB(C)
    • P(b);OGATE::QAR(C)
  • Tries
    • Try
      • K(A);P-FLIGHT
      • Vars
        • R(e);OGATEB::QAR2(C),XR(e)
        • P(b);OGATE::QAR(C)
      • Refutation
        • P(a);CHECK
    • Try
      • R(B);
      • Vars
        • R(e);OGATEB,P_PINQ(C)::QAR2(C),XR(e)
        • P(a);OGATE::QAB(C)
        • P(b);OGATE::QAR(C)
      • Refutation
        • P(a);XR(B)
    • Try
      • R(B);
      • Vars
        • R(e);OGATEB,P_PINQ(C)::QAR2(C),XR(e)
        • P(b);OGATE::QAR(C)
      • Refutation
        • P(a);
    • Try
      • R(B);
      • Vars
        • R(e);OGATEB,P_PINQ(C)::QAR2(C),XR(e)
        • P(a);OGATE::QAB(C)
        • P(b);OGATE::QAR(C)
      • Refutation
        • P(b);XR(B)
    • Try
      • R(B);
      • Vars
        • R(e);OGATEB,P_PINQ(C)::QAR2(C),XR(e)
        • P(a);OGATE::QAB(C)
        • P(b);OGATE::QAR(C)
      • Refutation
        • P(c);XR(B)
    • Try
      • R(B);
      • Vars
        • R(e);OGATEB,P_PINQ(C)::QAR2(C),XR(e)
        • P(a);OGATE::QAB(C)
      • Refutation
        • P(b);
    • Try
      • Q(C);
      • Threat
        • DUALS(2)
      • Vars
        • R(e);OGATEB,P_PINQ(C)::QAR2(C),XR(e)
      • Refutation
        • P(b);
    • Try
      • Q(C);
      • Threat
        • QAB(C)
      • Vars
        • R(e);OGATEB,P_PINQ(C)::QAR2(C),XR(e)
      • Refutation
        • P(b);
    • Try
      • Q(C);
      • Vars
        • R(e);OGATEB,P_PINQ(C)::QAR2(C),XR(e)
        • P(b);OGATE::QAB(C)
      • Refutation
        • P(a);
  • Actual
    • K(A);P-FLIGHT
    • Vars
      • R(e);OGATEB,P_PINQ(C)::QAR2(C),XR(e)
      • P(a);OGATE::QAB(C)
      • P(b);OGATE::QAR(C)
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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).