MESON Chess Problem Database

Problem Display
PID: 45367 (7Q/4bK2/6p1/4p1kN/4RnP1/4Pb2/4B1N1/r5R1 w - - 0 1)

Stevenson, Edward

Double Pin-Mate after a Black King Move, 1980

7Q/4bK2/6p1/4p1kN/4RnP1/4Pb2/4B1N1/r5R1

#2

9 + 7

SOLUTION

  • SOUND
  • Tries
    • 1.Sf6?
      • threat
        • 2.Rxe5#
        • 2.Qh4#
      • 1...Bxg2
        • 2.Rxe5#
      • 1...Bxe4
        • 2.Sxe4#
        • 2.Qh4#
      • 1...Bxf6
        • 2.Qh4#
      • 1...Sxg2
        • 2.Rxe5#
      • 1...Ra5
        • 2.Qh4#
      • 1...Bd6
        • 2.Qh4#
      • 1...Sd3
        • 2.Qh4#
      • 1...Sh5
        • 2.Rxe5#
      • 1...Bxg4!
  • Keys
    • 1.Sg7!
      • threat
        • 2.Qh4#
      • 1...Kxg4
        • 2.Se1#
      • 1...Bxg2
        • 2.Rxe5#
      • 1...Sxg2
        • 2.Se6#
      • 1...Sh5
        • 2.Se6#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 4
    • REMOVED MATES = 0
  • Sets
  • Tries
    • Try
      • S(G);
      • Threat
        • DUALS(2)
      • Vars
        • B(b);XS(C)::R(E),XP(d)
        • B(g);XS(G)::QAB1(I)
        • S(c);XS(C)::R(E),XP(d)
        • R(a);::QAB1(I)
        • B(g);::QAB1(I)
        • S(c);::QAB1(I)
        • S(c);::R(E),XP(d)
      • Refutation
        • B(b);XP(F)
  • Actual
    • S(G);
    • Threat
      • QAB1(I)
    • Vars
      • K(e);P-FLIGHT,P_SPINB(b),P_SPINS(c),XP(F)::R(A)+S(C)
      • B(b);XS(C)::R(E),XP(d)
      • S(c);N_GUARD,XS(C)::S(G)
      • S(c);N_GUARD::S(G)
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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).