MESON Chess Problem Database

Problem Display
PID: 120861 (2K5/k7/2Q5/2n5/8/8/8/8 w - - 0 1)

Lokker, Miklosh S

Karpati Igaz Szo, 1967

2K5/k7/2Q5/2n5/8/8/8/8

#2

2 + 2

6490 yacpdb 2009
3713 Snap 2020
5454 Near Snap 2021

SOLUTION

  • SOUND
  • Sets
    • 1...Sb3
      • 2.Qb7#
    • 1...Sd3
      • 2.Qb7#
    • 1...Sa4
      • 2.Qb7#
    • 1...Se4
      • 2.Qb7#
    • 1...Sa6
      • 2.Qb7#
    • 1...Se6
      • 2.Qb7#
    • 1...Sb7
      • 2.Qxb7#
    • 1...Sd7
      • 2.Qb7#
  • Tries
    • 1.Qxc5+?
      • 1...Ka8
        • 2.Qa3#
        • 2.Qa5#
      • 1...Ka6!
    • 1.Qb6+?
      • 1...Ka8
        • 2.Qb8#
      • 1...Kxb6!
    • 1.Qc7+?
      • 1...Ka8
        • 2.Qb8#
      • 1...Sb7
        • 2.Qxb7#
      • 1...Ka6!
  • Keys
    • 1.Qb5!
      • 1...Ka8
        • 2.Qb8#
      • 1...Sb3
        • 2.Qb7#
      • 1...Sd3
        • 2.Qa5#
        • 2.Qb7#
      • 1...Sa4
        • 2.Qa5#
        • 2.Qb7#
      • 1...Se4
        • 2.Qa5#
        • 2.Qb7#
      • 1...Sa6
        • 2.Qb7#
      • 1...Se6
        • 2.Qa5#
        • 2.Qb7#
      • 1...Sb7
        • 2.Qxb7#
      • 1...Sd7
        • 2.Qa5#
        • 2.Qb7#

Anticipated by 203503(1924), 227718(1926), 227885(1926)

This anticipates 216695(1975)

FEATURES

  • Static
    • TYPE = WAITER
    • CHANGED MATES = 0
    • ADDED MATES = 1
    • REMOVED MATES = 5
  • Sets
    • S(a);N_GUARD::QAR1(A)
    • S(a);N_GUARD::QAR1(A),XS(a)
  • Tries
    • Try
      • Q(A);CHECK,XS(a)
      • Refutation
        • K(b);P-FLIGHT
    • Try
      • Q(A);CHECK
      • Vars
        • K(b);P-FLIGHT::QAR1(A)
      • Refutation
        • K(b);S_FLIGHT,XQ(A)
    • Try
      • Q(A);CHECK
      • Vars
        • K(b);P-FLIGHT::QAR1(A)
        • S(a);N_GUARD,P_SPINS(a)::QAR1(A),XS(a)
      • Refutation
        • K(b);P-FLIGHT
  • Actual
    • Q(A);
    • Vars
      • K(b);P-FLIGHT::QAR1(A)
      • S(a);N_GUARD::QAR1(A)
      • S(a);N_GUARD::QAR1(A),XS(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).