MESON Chess Problem Database

Problem Display
PID: 245134 (6R1/8/6pq/7k/8/2Q2N1K/8/8 w - - 0 1)

Labai, Zoltan

Smena (Moscow), 2001

6R1/8/6pq/7k/8/2Q2N1K/8/8

#2

4 + 3

15148 Sadier Collection 2021

SOLUTION

  • SOUND
  • Sets
    • 1...Qh8
      • 2.Rxh8#
      • 2.Qxh8#
  • Tries
    • 1.Rh8?
      • 1...Qxh8
        • 2.Qxh8#
      • 1...Qh7
        • 2.Rxh7#
      • 1...g5!
    • 1.Qa5+?
      • 1...Qg5
        • 2.Rh8#
        • 2.Qxg5#
      • 1...g5!
    • 1.Qe5+?
      • 1...Qg5
        • 2.Rh8#
        • 2.Qxg5#
      • 1...g5!
    • 1.Qf6?
      • threat
        • 2.Qh4#
      • 1...Qf4
        • 2.Qxg6#
      • 1...Qg5
        • 2.Qxg5#
      • 1...g5!
    • 1.Qc5+?
      • 1...Qg5
        • 2.Rh8#
        • 2.Qxg5#
      • 1...g5!
  • Keys
    • 1.Qh8!
      • 1...Qxh8
        • 2.Rxh8#
      • 1...Qh7
        • 2.Qxh7#
      • 1...g5
        • 2.Rxg5#

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 0
  • Sets
  • Tries
    • Try
      • R(D);P_PINQ(c)
      • Vars
        • Q(c);N_SPINQ(c),OGATE,XR(D)::QAR(A),XQ(c)
        • Q(c);OGATEB::R(D),XQ(c)
      • Refutation
        • P(b);
    • Try
      • Q(A);CHECK
      • Refutation
        • P(b);P_SPINP(b)
    • Try
      • Q(A);CHECK
      • Refutation
        • P(b);P_SPINP(b)
    • Try
      • Q(A);
      • Threat
        • QAR1(A)
      • Vars
        • Q(c);N_GUARD::QAB1(A),XP(b)
        • Q(c);N_GUARD::QAR1(A),XQ(c)
      • Refutation
        • P(b);
    • Try
      • Q(A);CHECK
      • Refutation
        • P(b);P_SPINP(b)
  • Actual
    • Q(A);P_PINQ(c)
    • Vars
      • Q(c);N_SPINQ(c),OGATE,XQ(A)::R(D),XQ(c)
      • Q(c);OGATEB::QAR2(A),XQ(c)
      • P(b);OGATE::R1(D),XP(b)
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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).