MESON Chess Problem Database

Problem Display
PID: 45466 (6KB/1N2p3/2Bp4/R2Pb3/1pk3pR/P3r2r/1PP5/5bQ1 w - - 0 1)

Stevenson, Edward

Double Pin-Mate after a Black King Move, 1980

6KB/1N2p3/2Bp4/R2Pb3/1pk3pR/P3r2r/1PP5/5bQ1

#2

11 + 9

SOLUTION

  • SOUND
  • Sets
    • 1...Kd4
      • 2.Rxg4#
    • 1...Bc3
      • 2.b3#
    • 1...bxa3
      • 2.Ra4#
    • 1...b3
      • 2.Ra4#
  • Tries
    • 1.Rc5+?
      • 1...Kd4
        • 2.Rxg4#
      • 1...dxc5!
  • Keys
    • 1.Ra4!
      • threat
        • 2.Rxb4#
      • 1...Kd4
        • 2.Rxg4#
      • 1...Rxa3
        • 2.Sa5#
      • 1...Rb3
        • 2.Sa5#
      • 1...Bc3
        • 2.b3#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 2
    • REMOVED MATES = 2
  • Sets
    • K(e);P-FLIGHT,P_SPINB(g),P_SPINR(b)::R(E),XP(f)
    • B(g);S_CUTR(b)::P(B)
    • P(d);OGATEB,XP(D)::R(F)
    • P(d);OGATEB::R(F)
  • Tries
    • Try
      • R(F);CHECK
      • Vars
        • K(e);P-FLIGHT,P_SPINB(g),P_SPINR(b)::R(E),XP(f)
      • Refutation
        • P(h);XR(F)
  • Actual
    • R(F);N_PINP(f),P_PINP(d)
    • Threat
      • R1(F),XP(d)
    • Vars
      • K(e);P-FLIGHT,P_SPINB(g),P_SPINR(b)::R(E),XP(f)
      • R(b);XP(D)::S(I)
      • R(b);::S(I)
      • B(g);S_CUTR(b)::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).