MESON Chess Problem Database

Problem Display
PID: 43361 (1B4B1/3p3N/3n4/3PP1NR/1K1kn3/1ppb1R2/2P1pP2/4r3 w - - 0 1)

Stevenson, Edward

Double Pin-Mate after a Black King Move, 1980

1B4B1/3p3N/3n4/3PP1NR/1K1kn3/1ppb1R2/2P1pP2/4r3

#2

11 + 9

SOLUTION

  • SOUND
  • Sets
    • 1...Sc4
      • 2.Rxd3#
    • 1...Sb5
      • 2.Rxd3#
    • 1...Sf5
      • 2.Rxd3#
    • 1...Sb7
      • 2.Rxd3#
    • 1...Sf7
      • 2.Rxd3#
    • 1...Sc8
      • 2.Rxd3#
    • 1...Se8
      • 2.Rxd3#
  • Tries
    • 1.Se6+?
      • 1...dxe6
        • 2.Rxd3#
      • 1...Kxd5!
    • 1.Ba7+?
      • 1...Kxe5
        • 2.Sf7#
      • 1...Sc5!
  • Keys
    • 1.Re3!
      • threat
        • 2.Sf3#
      • 1...Kxe5
        • 2.Se6#
      • 1...Sxf2
        • 2.Ba7#
      • 1...Sxg5
        • 2.Ba7#
      • 1...Sd2
        • 2.Ba7#
      • 1...Sf7
        • 2.Rxd3#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 4
    • REMOVED MATES = 6
  • Sets
    • S(h);::R1(C),XB(e)
  • Tries
    • Try
      • S(G);CHECK
      • Vars
        • P(i);XS(G)::R1(C),XB(e)
      • Refutation
        • K(f);P-FLIGHT,XP(E)
    • Try
      • B(J);CHECK
      • Vars
        • K(f);S_FLIGHT,XP(F)::R(H)+S(G),DCHECK
      • Refutation
        • S(g);P_SPINS(g)
  • Actual
    • R(C);
    • Threat
      • S(G)
    • Vars
      • K(f);P_SPINS(g),S_FLIGHT,XP(F)::R(H)+S(G)
      • S(g);N_GUARD,XP(B)::B(J)
      • S(g);N_GUARD,XS(G)::B(J)
      • S(g);N_GUARD::B(J)
      • S(h);::R1(C),XB(e)
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).