MESON Chess Problem Database

Problem Display
PID: 121509 (kb4R1/8/n6K/2Q1p3/2b5/8/R7/8 w - - 0 1)

Sobek, Karel

Ruch, 1948

kb4R1/8/n6K/2Q1p3/2b5/8/R7/8

#2

4 + 5

6490 yacpdb 2009

SOLUTION

  • SOUND
  • Tries
    • 1.Rxa6+?
      • 1...Kb7
        • 2.Qb6#
        • 2.Qc6#
        • 2.Qc8#
      • 1...Bxa6!
    • 1.Qb6?
      • threat
        • 2.Rxb8#
        • 2.Qxb8#
      • 1...Bxa2
        • 2.Qxa6#
      • 1...Bxg8!
    • 1.Qxc4?
      • threat
        • 2.Qxa6#
      • 1...Ka7
        • 2.Qxa6#
      • 1...Kb7!
  • Keys
    • 1.Qc8!
      • threat
        • 2.Qxb8#
      • 1...Ka7
        • 2.Qxb8#
      • 1...Bxa2
        • 2.Qxa6#
      • 1...Bxg8
        • 2.Rxa6#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 0
  • Sets
  • Tries
    • Try
      • R(A);CHECK,XS(c)
      • Refutation
        • B(a);XR(A)
    • Try
      • Q(B);
      • Threat
        • DUALS(2)
      • Vars
        • B(a);N_GUARD,N_SPINS(c),XR(A)::QAR2(B),XS(c)
      • Refutation
        • B(a);N_SPINB(e),XR(D)
    • Try
      • Q(B);XB(a)
      • Threat
        • QAR2(B),XS(c)
      • Vars
        • K(d);N_SPINB(e),P-FLIGHT::QAR1(B),XS(c)
      • Refutation
        • K(d);N_SPINB(e),N_SPINS(c),S_FLIGHT
  • Actual
    • Q(B);
    • Threat
      • QAR1(B),XB(e)
    • Vars
      • K(d);N_SPINB(e),P-FLIGHT::QAB1(B),XB(e)
      • B(a);N_GUARD,N_SPINS(c),XR(A)::QAR2(B),XS(c)
      • B(a);N_GUARD,XR(D)::R(A),XS(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).