MESON Chess Problem Database

Problem Display
PID: 45556 (1B1Rn2Q/1b6/3n1r2/4P3/1K2k1P1/3R2P1/2PP4/8 w - - 0 1)

Stevenson, Edward

Double Pin-Mate after a Black King Move, 1980

1B1Rn2Q/1b6/3n1r2/4P3/1K2k1P1/3R2P1/2PP4/8

#2

10 + 5

SOLUTION

  • SOUND
  • Sets
    • 1...Kxe5
      • 2.Rxe8#
    • 1...Sc4
      • 2.R8d4#
    • 1...Sb5
      • 2.Re3#
    • 1...Sf5
      • 2.Qh1#
    • 1...Sf7
      • 2.Re3#
      • 2.R8d4#
    • 1...Sc8
      • 2.Re3#
      • 2.R8d4#
  • Tries
    • 1.Qxf6?
      • threat
        • 2.Qf4#
      • 1...Sf5
        • 2.Qxf5#
      • 1...Sxf6!
  • Keys
    • 1.Kc5!
      • threat
        • 2.Re3#
      • 1...Kxe5
        • 2.Rxe8#
      • 1...Rf3
        • 2.Rd4#
      • 1...Sc4
        • 2.R8d4#
      • 1...Sf5
        • 2.Qh1#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 1
    • REMOVED MATES = 1
  • Sets
    • K(a);OGATEB,P-FLIGHT,P_SPINR(c),P_SPINS(b),XP(G)::R(I),XS(e)
    • S(b);OGATE::R1(I)
    • S(b);::R1(C)
    • S(b);S_CUTR(c)::QAB(J)
  • Tries
    • Try
      • Q(J);XR(c)
      • Threat
        • QAR1(J)
      • Vars
        • S(b);N_GUARD::QAB1(J),XS(b)
      • Refutation
        • S(e);XQ(J)
  • Actual
    • K(E);S_FLIGHT
    • Threat
      • R1(C)
    • Vars
      • K(a);OGATEB,P-FLIGHT,P_SPINR(c),P_SPINS(b),XP(G)::R(I),XS(e)
      • R(c);SBLOCK::R1(C)
      • S(b);OGATE::R1(I)
      • S(b);S_CUTR(c)::QAB(J)
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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).