MESON Chess Problem Database

Problem Display
PID: 45455 (B3RB2/8/4n2Q/2Pp1r1R/2pk4/5n2/1P3N2/K7 w - - 0 1)

Stevenson, Edward

Double Pin-Mate after a Black King Move, 1980

B3RB2/8/4n2Q/2Pp1r1R/2pk4/5n2/1P3N2/K7

#2

9 + 6

SOLUTION

  • SOUND
  • Sets
    • 1...Ke5
      • 2.Bg7#
    • 1...Rf6
      • 2.Rxd5#
    • 1...Rf7
      • 2.Rxd5#
    • 1...Rxf8
      • 2.Rxd5#
    • 1...Sxc5
      • 2.Qe3#
    • 1...Sc7
      • 2.Qe3#
    • 1...Sg7
      • 2.Qe3#
    • 1...Sd8
      • 2.Qe3#
    • 1...Sxf8
      • 2.Qe3#
  • Tries
    • 1.Qd2+?
      • 1...Ke5
        • 2.Bg7#
      • 1...Sxd2!
  • Keys
    • 1.Qc1!
      • threat
        • 2.Qc3#
      • 1...Ke5
        • 2.Bg7#
      • 1...Rxf8
        • 2.Rxd5#
      • 1...Sxf8
        • 2.Qe3#
      • 1...c3
        • 2.Qxc3#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 1
    • REMOVED MATES = 6
  • Sets
    • K(c);P_SPINR(e),P_SPINS(f),S_FLIGHT::B(I)
    • R(e);OGATE::R1(E),XP(d)
    • R(e);OGATE,XB(I)::R1(E),XP(d)
    • S(f);XP(D)::QAB1(F)
    • S(f);::QAB1(F)
    • S(f);XB(I)::QAB1(F)
  • Tries
    • Try
      • Q(F);CHECK
      • Vars
        • K(c);P_SPINR(e),P_SPINS(f),S_FLIGHT::B(I)
      • Refutation
        • S(a);XQ(F)
  • Actual
    • Q(F);
    • Threat
      • QAB1(F)
    • Vars
      • K(c);P_SPINR(e),P_SPINS(f),S_FLIGHT::B(I)
      • R(e);OGATE,XB(I)::R1(E),XP(d)
      • S(f);XB(I)::QAB1(F)
      • P(b);::QAB1(F),XP(b)
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).