MESON Chess Problem Database

Problem Display
PID: 43340 (1B2R3/Qp2N1K1/2Pb1p1n/2Rb4/3kP3/5nP1/2B2P2/N7 w - - 0 1)

Stevenson, Edward

Double Pin-Mate after a Black King Move, 1980

1B2R3/Qp2N1K1/2Pb1p1n/2Rb4/3kP3/5nP1/2B2P2/N7

#2

12 + 7

SOLUTION

  • SOUND
  • Sets
    • 1...Ke5
      • 2.Sf5#
    • 1...Bb3
      • 2.Sxb3#
    • 1...Bxe4
      • 2.Sb3#
    • 1...Bxc6
      • 2.Sb3#
    • 1...Sg4
      • 2.Sf5#
    • 1...Sf5+
      • 2.Sxf5#
    • 1...Sf7
      • 2.Sf5#
    • 1...Sg8
      • 2.Sf5#
  • Tries
    • 1.Sb3+?
      • 1...Ke5
        • 2.Sxd5#
        • 2.Sf5#
        • 2.Sg6#
        • 2.Sc8#
        • 2.Sg8#
      • 1...Bxb3!
    • 1.Rc4+?
      • 1...Ke5
        • 2.Sxd5#
        • 2.Sg6#
      • 1...Kxc4!
    • 1.Qa4+?
      • 1...Ke5
        • 2.Sxd5#
        • 2.Sf5#
        • 2.Sg6#
        • 2.Sc8#
        • 2.Sg8#
      • 1...Bc4
        • 2.Qxc4#
      • 1...Kxc5!
  • Keys
    • 1.Qa3!
      • threat
        • 2.Qc3#
      • 1...Sf5+
        • 2.Sxf5#
      • 1...Ke5
        • 2.Sf5#
      • 1...Bxc5
        • 2.Qd3#
      • 1...Bb3
        • 2.Sxb3#
      • 1...Bc4
        • 2.Qe3#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 2
    • REMOVED MATES = 5
  • Sets
    • K(b);P_SPINB(c),S_FLIGHT::R(L)+S(I)
    • B(c);N_GUARD::S(A),XB(c)
    • B(c);N_GUARD,XP(E)::S(A)
    • B(c);N_GUARD,XP(G)::S(A)
    • S(f);N_GUARD::S(I)
    • S(f);CHECK,N_GUARD::S(I),XS(f)
  • Tries
    • Try
      • S(A);CHECK
      • Refutation
        • B(c);XS(A)
    • Try
      • R(F);CHECK
      • Refutation
        • K(b);P-FLIGHT,XR(F)
    • Try
      • Q(H);CHECK
      • Vars
        • B(c);N_GUARD,P_SPINB(c)::QAR1(H),XB(c)
      • Refutation
        • K(b);S_FLIGHT,XR(F)
  • Actual
    • Q(H);
    • Threat
      • QAB1(H)
    • Vars
      • S(f);CHECK,N_GUARD::S(I),XS(f)
      • K(b);P_SPINB(c),S_FLIGHT::R(L)+S(I)
      • B(d);SBLOCK,XR(F)::QAR1(H)
      • B(c);N_GUARD::S(A),XB(c)
      • B(c);::QAB1(H)
HTML5 logo

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).