MESON Chess Problem Database

Problem Display
PID: 257761 (kqN5/1p6/1Q6/K1R5/8/8/8/8 w - - 0 1)

Labai, Zoltan

2nd HM., Problemist Ukraini, 2018

kqN5/1p6/1Q6/K1R5/8/8/8/8

#2

4 + 3

SOLUTION

  • SOUND
  • Sets
    • 1...Qh2
      • 2.Qa7#
    • 1...Qg3
      • 2.Qa7#
    • 1...Qf4
      • 2.Qa7#
    • 1...Qe5
      • 2.Qa7#
    • 1...Qd6
      • 2.Qa7#
    • 1...Qa7+
      • 2.Qxa7#
    • 1...Qxc8
      • 2.Rxc8#
  • Tries
    • 1.Ka4?
      • 1...Qa7+
        • 2.Qxa7#
      • 1...Qxc8
        • 2.Rxc8#
      • 1...Qh2
        • 2.Qa7#
      • 1...Qg3
        • 2.Qa7#
      • 1...Qe5
        • 2.Qa7#
      • 1...Qd6
        • 2.Qa7#
      • 1...Qc7
        • 2.Qa7#
      • 1...Qf4+!
    • 1.Kb4?
      • 1...Qxc8
        • 2.Rxc8#
      • 1...Qh2
        • 2.Qa7#
      • 1...Qg3
        • 2.Qa7#
      • 1...Qe5
        • 2.Qa7#
      • 1...Qd6
        • 2.Qa7#
      • 1...Qa7
        • 2.Qxa7#
      • 1...Qc7
        • 2.Qa7#
      • 1...Qf4+!
    • 1.Rc7?
      • 1...Qa7+
        • 2.Qxa7#
      • 1...Qxc8
        • 2.Rxc8#
      • 1...Qxc7!
    • 1.Qa6+?
      • 1...Qa7
        • 2.Qxa7#
      • 1...bxa6!
  • Keys
    • 1.Kb5!
      • 1...Qxc8
        • 2.Rxc8#
      • 1...Qh2
        • 2.Qa7#
      • 1...Qg3
        • 2.Qa7#
      • 1...Qf4
        • 2.Qa7#
      • 1...Qe5
        • 2.Qa7#
      • 1...Qd6
        • 2.Qa7#
      • 1...Qa7
        • 2.Qxa7#
      • 1...Qc7
        • 2.Qa7#

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 0
    • ADDED MATES = 1
    • REMOVED MATES = 0
  • Sets
    • Q(c);N_GUARD::QAR1(C)
    • Q(c);N_GUARD,P_PINR(B)::QAR1(C)
    • Q(c);CHECK,N_GUARD::QAR1(C),XQ(c)
    • Q(c);OGATE,XS(D)::R(B),XQ(c)
  • Tries
    • Try
      • K(A);P-FLIGHT
      • Vars
        • Q(c);CHECK,N_GUARD::QAR1(C),XQ(c)
        • Q(c);OGATE,XS(D)::R(B),XQ(c)
        • Q(c);N_GUARD::QAR1(C)
      • Refutation
        • Q(c);CHECK
    • Try
      • K(A);S_FLIGHT
      • Vars
        • Q(c);OGATE,XS(D)::R(B),XQ(c)
        • Q(c);N_GUARD::QAR1(C)
        • Q(c);N_GUARD,P_PINR(B)::QAR1(C)
        • Q(c);N_GUARD::QAR1(C),XQ(c)
      • Refutation
        • Q(c);CHECK
    • Try
      • R(B);
      • Vars
        • Q(c);CHECK,N_GUARD::QAR1(C),XQ(c)
        • Q(c);OGATE,XS(D)::R(B),XQ(c)
      • Refutation
        • Q(c);P_PINQ(C),XR(B)
    • Try
      • Q(C);CHECK
      • Vars
        • Q(c);N_GUARD,P_PINQ(C),P_SPINQ(c)::QAR1(C),XQ(c)
      • Refutation
        • P(a);XQ(C)
  • Actual
    • K(A);P-FLIGHT
    • Vars
      • Q(c);OGATE,XS(D)::R(B),XQ(c)
      • Q(c);N_GUARD::QAR1(C)
      • Q(c);N_GUARD,P_PINR(B)::QAR1(C)
      • Q(c);N_GUARD::QAR1(C),XQ(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).