MESON Chess Problem Database

Problem Display
PID: 45451 (4R3/2N2p2/4n3/2P5/3k1rP1/B5Q1/2PN1Pn1/7K w - - 0 1)

Stevenson, Edward

Double Pin-Mate after a Black King Move, 1980

4R3/2N2p2/4n3/2P5/3k1rP1/B5Q1/2PN1Pn1/7K

#2

10 + 5

SOLUTION

  • SOUND
  • Sets
    • 1...Ke5
      • 2.Bb2#
    • 1...Rxf2
      • 2.c3#
    • 1...Re4
      • 2.c3#
    • 1...Rxg4
      • 2.c3#
    • 1...Rf5
      • 2.c3#
    • 1...Rf6
      • 2.c3#
    • 1...Se1
      • 2.Qe3#
    • 1...Se3
      • 2.Qxe3#
    • 1...Sh4
      • 2.Qe3#
    • 1...Sxc5
      • 2.Bb2#
      • 2.c3#
    • 1...Sg5
      • 2.Qd3#
      • 2.c3#
    • 1...Sxc7
      • 2.Qd3#
    • 1...Sg7
      • 2.Qd3#
      • 2.c3#
    • 1...Sd8
      • 2.Qd3#
      • 2.c3#
    • 1...Sf8
      • 2.Qd3#
      • 2.c3#
  • Tries
    • 1.Rxe6?
      • threat
        • 2.Qd3#
        • 2.c3#
      • 1...Rf3
        • 2.Qe5#
      • 1...Se3
        • 2.Qxe3#
      • 1...Se1
        • 2.Qe3#
        • 2.c3#
      • 1...fxe6!
  • Keys
    • 1.Bb4!
      • threat
        • 2.Qc3#
      • 1...Ke5
        • 2.Bc3#
      • 1...Sxc7
        • 2.Qd3#
      • 1...Rf3
        • 2.Qd6#
      • 1...Se3
        • 2.Qxe3#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 1
    • ADDED MATES = 1
    • REMOVED MATES = 7
  • Sets
    • K(b);P_SPINR(c),P_SPINS(d),S_FLIGHT::B(E)
    • R(c);XP(D)::P(B)
    • R(c);::P(B)
    • R(c);XP(G)::P(B)
    • S(a);N_GUARD::QAB1(F)
    • S(a);N_GUARD::QAB1(F),XS(a)
    • S(d);XS(I)::QAR1(F)
  • Tries
    • Try
      • R(J);XS(d)
      • Threat
        • DUALS(2)
      • Vars
        • R(c);OGATE::QAB1(F)
        • S(a);N_GUARD::QAB1(F),XS(a)
      • Refutation
        • P(e);XR(J)
  • Actual
    • B(E);
    • Threat
      • QAB1(F)
    • Vars
      • K(b);P_SPINR(c),P_SPINS(d),S_FLIGHT::B(E)
      • S(d);XS(I)::QAR1(F)
      • R(c);OGATE::QAR2(F)
      • S(a);N_GUARD::QAB1(F),XS(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).