MESON Chess Problem Database

Problem Display
PID: 45464 (B3b3/B5N1/2r3p1/1RnP4/4k3/2PN3Q/r3n3/4R2K w - - 0 1)

Stevenson, Edward

Double Pin-Mate after a Black King Move, 1980

B3b3/B5N1/2r3p1/1RnP4/4k3/2PN3Q/r3n3/4R2K

#2

10 + 7

SOLUTION

  • SOUND
  • Sets
    • 1...Kxd5
      • 2.Qe6#
    • 1...Ra6
      • 2.Rb4#
    • 1...Rd6
      • 2.Rb4#
    • 1...Re6
      • 2.Rb4#
    • 1...Rf6
      • 2.Rb4#
    • 1...Rc7
      • 2.Rb4#
    • 1...Rc8
      • 2.Rb4#
    • 1...Sb3
      • 2.Qe3#
    • 1...Sxd3
      • 2.Qe3#
    • 1...Sa4
      • 2.Qe3#
    • 1...Sa6
      • 2.Qe3#
    • 1...Se6
      • 2.Qe3#
    • 1...Sb7
      • 2.Qe3#
    • 1...Sd7
      • 2.Qe3#
  • Tries
    • 1.Rxe2+?
      • 1...Kxd5
        • 2.Qe6#
      • 1...Rxe2!
    • 1.Qe3+?
      • 1...Kxd5
        • 2.Qe6#
      • 1...Kxe3!
  • Keys
    • 1.Kg2!
      • threat
        • 2.Qf3#
      • 1...Kxd5
        • 2.Qe6#
      • 1...Sxd3
        • 2.Qe3#
      • 1...Rf6
        • 2.Rb4#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 0
    • REMOVED MATES = 11
  • Sets
    • K(c);N_SPINS(b),P_SPINR(e),P_SPINS(d),S_FLIGHT,XP(G)::QAB1(E)
    • R(e);::R(F)
    • S(d);::QAR1(E)
    • S(d);XS(D)::QAR1(E)
  • Tries
    • Try
      • R(A);CHECK,XS(b)
      • Vars
        • K(c);P_SPINR(e),P_SPINS(d),S_FLIGHT,XP(G)::QAB1(E)
      • Refutation
        • R(a);XR(A)
    • Try
      • Q(E);CHECK,N_PINS(b)
      • Vars
        • K(c);OGATE,P_SPINR(e),P_SPINS(d),S_FLIGHT,XP(G)::QAB1(E)
      • Refutation
        • K(c);P-FLIGHT,P_SPINS(b),XQ(E)
  • Actual
    • K(B);S_FLIGHT
    • Threat
      • QAB1(E)
    • Vars
      • K(c);N_SPINS(b),P_SPINR(e),P_SPINS(d),S_FLIGHT,XP(G)::QAB1(E)
      • S(d);XS(D)::QAR1(E)
      • R(e);::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).