MESON Chess Problem Database

Problem Display
PID: 45212 (1B3K1N/5p2/3N1r1R/3rk1p1/2Bp1p2/3p4/R7/1Qn5 w - - 0 1)

Stevenson, Edward

Double Pin-Mate after a Black King Move, 1980

1B3K1N/5p2/3N1r1R/3rk1p1/2Bp1p2/3p4/R7/1Qn5

#2

8 + 9

SOLUTION

  • SOUND
  • Sets
    • 1...Ra5
      • 2.Rxa5#
    • 1...Rb5
      • 2.Qxb5#
    • 1...Re6
      • 2.Shxf7#
    • 1...Sxa2
      • 2.Qe1#
    • 1...Sb3
      • 2.Qe1#
    • 1...d2
      • 2.Qe4#
  • Tries
    • 1.Re2+?
      • 1...dxe2
        • 2.Qe4#
      • 1...Sxe2!
  • Keys
    • 1.Qxd3!
      • threat
        • 2.Qe4#
      • 1...Ke6
        • 2.Qf5#
      • 1...Rdxd6
        • 2.Ra5#
      • 1...Rfxd6
        • 2.Sxf7#
      • 1...Rxh6
        • 2.Qf5#
      • 1...Sxd3
        • 2.Re2#
      • 1...Rg6
        • 2.Qf5#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 6
    • REMOVED MATES = 6
  • Sets
    • R(e);OGATEB::R(B),XR(e)
    • R(e);OGATEB::QAR(A),XR(e)
    • R(h);N_GUARD::S(H),XP(i)
    • S(a);OGATE,XR(B)::QAR(A)
    • S(a);OGATE::QAR(A)
    • P(b);OGATE::QAR1(A)
  • Tries
    • Try
      • R(B);CHECK
      • Vars
        • P(b);OGATE,XR(B)::QAR1(A)
      • Refutation
        • S(a);XR(B)
  • Actual
    • Q(A);XP(b)
    • Threat
      • QAR1(A)
    • Vars
      • K(f);P-FLIGHT,P_SPINR(e)::QAB1(A)
      • R(e);OGATEB,P_SPINR(e),XS(D)::R(B)
      • R(h);N_GUARD,P_SPINR(h),XS(D)::S(H),XP(i)
      • R(h);N_GUARD,XR(E)::QAR1(A)
      • S(a);N_GUARD,XQ(A)::R(B)
      • R(h);N_GUARD::QAR1(A)
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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).