MESON Chess Problem Database

Problem Display
PID: 45562 (2B5/7b/K2Q3B/p3n1r1/4k2N/2p1p1R1/1P1P3b/4r3 w - - 0 1)

Stevenson, Edward

Double Pin-Mate after a Black King Move, 1980

2B5/7b/K2Q3B/p3n1r1/4k2N/2p1p1R1/1P1P3b/4r3

#2

8 + 9

SOLUTION

  • SOUND
  • Sets
    • 1...Kf4
      • 2.Rg4#
    • 1...Rg6
      • 2.Bf5#
    • 1...Sf3
      • 2.d3#
    • 1...Sc4
      • 2.d3#
    • 1...Sg4
      • 2.d3#
    • 1...Sc6
      • 2.d3#
    • 1...Sg6
      • 2.d3#
    • 1...Sd7
      • 2.d3#
    • 1...Sf7
      • 2.d3#
  • Tries
    • 1.Bb7+?
      • 1...Sc6
        • 2.d3#
      • 1...Kf4!
    • 1.Rxe3+?
      • 1...Kf4
        • 2.Sg2#
        • 2.Qxe5#
      • 1...Rxe3!
    • 1.d3+?
      • 1...Kf4
        • 2.Rf3#
        • 2.Rg4#
      • 1...Sxd3!
  • Keys
    • 1.bxc3!
      • threat
        • 2.Qd4#
      • 1...Kf4
        • 2.Rg4#
      • 1...Rg6
        • 2.Bf5#
      • 1...Sf3
        • 2.d3#
      • 1...Sc6
        • 2.d3#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 0
    • REMOVED MATES = 5
  • Sets
    • K(e);P-FLIGHT,P_SPINR(h),P_SPINS(g)::R1(C)
    • R(h);N_GUARD,P_PINQ(F),S_CUTB(i)::B(H)
    • S(g);N_GUARD::P(B)
  • Tries
    • Try
      • B(H);CHECK
      • Vars
        • S(g);P_SPINS(g)::P(B)
      • Refutation
        • K(e);P-FLIGHT,P_SPINR(h),P_SPINS(g)
    • Try
      • R(C);CHECK,XP(d)
      • Refutation
        • R(a);XR(C)
    • Try
      • P(B);CHECK
      • Refutation
        • S(g);XP(B)
  • Actual
    • P(A);XP(c)
    • Threat
      • QAR1(F)
    • Vars
      • K(e);P-FLIGHT,P_SPINR(h),P_SPINS(g)::R1(C)
      • R(h);N_GUARD,P_PINQ(F),S_CUTB(i)::B(H)
      • S(g);N_GUARD::P(B)
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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).