MESON Chess Problem Database

Problem Display
PID: 185828 (2k3q1/3p3b/KP6/B7/2p4Q/6RB/8/8 w - - 0 1)

Stallybrass, Don HR

Chess, 1957

2k3q1/3p3b/KP6/B7/2p4Q/6RB/8/8

#2

6 + 5

SOLUTION

  • SOUND
  • Sets
    • 1...Bb1
      • 2.Rxg8#
    • 1...Bc2
      • 2.Rxg8#
    • 1...Bd3
      • 2.Rxg8#
    • 1...Be4
      • 2.Rxg8#
    • 1...Bf5
      • 2.Rxg8#
  • Tries
    • 1.Ka7?
      • threat
        • 2.b7#
      • 1...Be4
        • 2.Rxg8#
      • 1...Qd5!
    • 1.Qf4?
      • threat
        • 2.Qc7#
        • 2.b7#
      • 1...Qxg3
        • 2.Qf8#
        • 2.b7#
      • 1...Qe6
        • 2.Qc7#
      • 1...Qd5
        • 2.Qc7#
        • 2.Qf8#
      • 1...Qg6
        • 2.Qc7#
      • 1...Qd8
        • 2.b7#
      • 1...Be4
        • 2.Rxg8#
        • 2.Qc7#
      • 1...Kd8!
  • Keys
    • 1.Qe4!
      • threat
        • 2.Qa8#
      • 1...Kb8
        • 2.Qb7#
      • 1...Kd8
        • 2.b7#
      • 1...Qxg3
        • 2.Qe8#
      • 1...Bxe4
        • 2.Rxg8#
      • 1...Qd5
        • 2.Qe8#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 4
    • REMOVED MATES = 4
  • Sets
    • B(c);N_GUARD::R(A),XQ(e)
    • B(c);N_GUARD,N_SPINP(b)::R(A),XQ(e)
  • Tries
    • Try
      • K(E);P-FLIGHT
      • Threat
        • P(F)
      • Vars
        • B(c);N_GUARD::R(A),XQ(e)
      • Refutation
        • Q(e);
    • Try
      • Q(C);
      • Threat
        • DUALS(2)
      • Vars
        • Q(e);N_SPINP(b),P_PINP(F)::QAR1(C)
        • Q(e);P_PINP(F)::QAR1(C)
        • Q(e);::P(F)
      • Refutation
        • K(d);N_SPINP(b),P-FLIGHT
  • Actual
    • Q(C);
    • Threat
      • QAR2(C)
    • Vars
      • K(d);N_SPINP(b),P-FLIGHT::QAR1(C)
      • K(d);N_SPINP(b),P-FLIGHT::B(D)+P(F)
      • Q(e);N_GUARD,XR(A)::QAR2(C)
      • B(c);N_GUARD,XQ(C)::R(A),XQ(e)
      • Q(e);N_GUARD::QAR2(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).