MESON Chess Problem Database

Problem Display
PID: 45463 (4Q3/8/3rnnp1/R2r4/3k1p1p/B7/Bp1P1NN1/b2R3K w - - 0 1)

Stevenson, Edward

Double Pin-Mate after a Black King Move, 1980

4Q3/8/3rnnp1/R2r4/3k1p1p/B7/Bp1P1NN1/b2R3K

#2

9 + 10

SOLUTION

  • SOUND
  • Sets
    • 1...Re5
      • 2.Ra4#
      • 2.Qa4#
    • 1...Rf5
      • 2.Qa4#
    • 1...Rg5
      • 2.Qa4#
    • 1...Rh5
      • 2.Qa4#
    • 1...Sg5
      • 2.Ra4#
    • 1...Sc7
      • 2.Ra4#
    • 1...Sg7
      • 2.Ra4#
    • 1...Sd8
      • 2.Ra4#
    • 1...Sf8
      • 2.Ra4#
  • Tries
    • 1.Se1?
      • threat
        • 2.Sf3#
      • 1...Sg5
        • 2.Sc2#
        • 2.Ra4#
      • 1...f3
        • 2.Sxf3#
      • 1...Ke5!
  • Keys
    • 1.Sxh4!
      • threat
        • 2.Sf3#
      • 1...Ke5
        • 2.d4#
      • 1...Rh5
        • 2.Qa4#
      • 1...Sg5
        • 2.Ra4#
      • 1...f3
        • 2.Sxf3#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 2
    • REMOVED MATES = 6
  • Sets
    • R(f);::QAR(I)
    • S(h);::R(H)
  • Tries
    • Try
      • S(F);
      • Threat
        • S(F)
      • Vars
        • P(d);::S(F),XP(d)
      • Refutation
        • K(c);P_SPINR(f),P_SPINS(h),S_FLIGHT
  • Actual
    • S(F);XP(e)
    • Threat
      • S(F)
    • Vars
      • K(c);OGATE,P_SPINR(f),P_SPINS(h),S_FLIGHT::P(D)
      • R(f);P_PINS(F)::QAR(I)
      • S(h);::R(H)
      • P(d);::S(F),XP(d)
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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).