MESON Chess Problem Database

Problem Display
PID: 43363 (1b6/6N1/4p3/1Rn1n1Q1/4k3/1PP3P1/4B3/7K w - - 0 1)

Stevenson, Edward

Double Pin-Mate after a Black King Move, 1980

1b6/6N1/4p3/1Rn1n1Q1/4k3/1PP3P1/4B3/7K

#2

8 + 5

SOLUTION

  • SOUND
  • Sets
    • 1...Sxb3
      • 2.Qf4#
    • 1...Sa4
      • 2.Qf4#
    • 1...Sa6
      • 2.Qf4#
    • 1...Sb7
      • 2.Qf4#
    • 1...Scd7
      • 2.Qf4#
    • 1...Sg4
      • 2.Rb4#
    • 1...Sg6
      • 2.Rb4#
    • 1...Sed7
      • 2.Rb4#
    • 1...Sf7
      • 2.Rb4#
  • Tries
    • 1.Sh5?
      • threat
        • 2.Sf6#
      • 1...Scd7
        • 2.Qf4#
      • 1...Sg4
        • 2.Rb4#
      • 1...Sed7
        • 2.Rb4#
      • 1...Kd5!
    • 1.Rb4+?
      • 1...Sc4
        • 2.Rxc4#
      • 1...Kd5!
  • Keys
    • 1.Se8!
      • threat
        • 2.Sf6#
      • 1...Kd5
        • 2.Bf3#
      • 1...Scd7
        • 2.Qf4#
      • 1...Sg4
        • 2.Rb4#
      • 1...Sed7
        • 2.Rb4#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 1
    • REMOVED MATES = 6
  • Sets
    • S(b);XP(C)::QAR1(G)
    • S(b);::QAR1(G)
    • S(c);N_GUARD::R(F)
  • Tries
    • Try
      • S(H);
      • Threat
        • S(H)
      • Vars
        • S(b);::QAR1(G)
        • S(c);N_GUARD::R(F)
      • Refutation
        • K(a);P_SPINS(b),S_FLIGHT
    • Try
      • R(F);CHECK
      • Vars
        • S(c);N_GUARD,P_SPINS(c)::R(F),XS(c)
      • Refutation
        • K(a);P_SPINS(c),S_FLIGHT
  • Actual
    • S(H);
    • Threat
      • S(H)
    • Vars
      • K(a);P_SPINS(b),S_FLIGHT::B(B)
      • S(b);::QAR1(G)
      • S(c);N_GUARD::R(F)
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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).