MESON Chess Problem Database

Problem Display
PID: 269092 (5Q2/8/8/1p6/k1P1R3/8/2K5/8 w - - 0 1)

Velikhanov, Kenan

4th HM., Lincoln MT (StrateGems), 2022

5Q2/8/8/1p6/k1P1R3/8/2K5/8

#2

4 + 2

6490 yacpdb 2023

SOLUTION

  • SOUND
  • Sets
    • 1...b4
      • 2.Qa8#
  • Tries
    • 1.Kc3?
      • threat
        • 2.Qb4#
        • 2.Qa8#
      • 1...b4+
        • 2.Qxb4#
      • 1...bxc4
        • 2.Qb4#
      • 1...Ka5!
    • 1.Re6?
      • threat
        • 2.Ra6#
      • 1...Ka5
        • 2.Qa3#
      • 1...bxc4!
    • 1.c5+?
      • 1...Ka3
        • 2.Qa8#
      • 1...Ka5
        • 2.Qa8#
      • 1...b4!
  • Keys
    • 1.Qc5!
      • 1...Ka5
        • 2.Qxb5#
      • 1...bxc4
        • 2.Rxc4#
      • 1...b4
        • 2.Qa7#

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 1
    • ADDED MATES = 2
    • REMOVED MATES = 0
  • Sets
    • P(b);SBLOCK::QAR(D)
  • Tries
    • Try
      • K(A);P-FLIGHT
      • Threat
        • DUALS(2)
      • Vars
        • P(b);CHECK::QAR1(D),XP(b)
        • P(b);P_SPINP(b),XP(B)::QAR1(D)
      • Refutation
        • K(a);P-FLIGHT
    • Try
      • R(C);
      • Threat
        • R(C)
      • Vars
        • K(a);N_GUARD,P-FLIGHT::QAR2(D)
      • Refutation
        • P(b);XP(B)
    • Try
      • P(B);CHECK
      • Vars
        • K(a);P-FLIGHT::QAR(D)
      • Refutation
        • P(b);P_SPINP(b)
  • Actual
    • Q(D);
    • Vars
      • K(a);N_GUARD,P-FLIGHT,P_SPINP(b)::QAR1(D),XP(b)
      • P(b);OGATE,P_SPINP(b),XP(B)::R(C),XP(b)
      • P(b);SBLOCK::QAR(D)
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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).