MESON Chess Problem Database

Problem Display
PID: 45142 (7K/1N3p2/4PQp1/1B1kn1rp/1p2p3/2n1p3/b7/B1R5 w - - 0 1)

Stevenson, Edward

Double Pin-Mate after a Black King Move, 1980

7K/1N3p2/4PQp1/1B1kn1rp/1p2p3/2n1p3/b7/B1R5

#2

7 + 11

SOLUTION

  • SOUND
  • Sets
    • 1...Kd4
      • 2.Rd1#
    • 1...Sb1
      • 2.Rc5#
    • 1...Sd1
      • 2.Rc5#
    • 1...Se2
      • 2.Rc5#
    • 1...Sxb5
      • 2.Rc5#
  • Tries
    • 1.Qe7?
      • threat
        • 2.Qd6#
      • 1...Kd4
        • 2.Qc5#
      • 1...Sxb5
        • 2.Rc5#
      • 1...Sc4!
    • 1.exf7?
      • threat
        • 2.Qd6#
      • 1...Kd4
        • 2.Rd1#
      • 1...Sxb5
        • 2.Rc5#
      • 1...Sc4
        • 2.Bc6#
      • 1...Sxf7+!
  • Keys
    • 1.e7!
      • threat
        • 2.Qd6#
      • 1...Kd4
        • 2.Rd1#
      • 1...Sxb5
        • 2.Rc5#
      • 1...Sc4
        • 2.Bc6#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 1
    • REMOVED MATES = 3
  • Sets
    • K(f);P-FLIGHT,P_SPINS(b)::R(B)
    • S(b);OGATE::R1(B)
    • S(b);OGATE,XB(C)::R1(B)
  • Tries
    • Try
      • Q(E);
      • Threat
        • QAR1(E)
      • Vars
        • K(f);P-FLIGHT,P_SPINS(b)::QAB1(E)
        • S(b);OGATE,XB(C)::R1(B)
      • Refutation
        • S(g);
    • Try
      • P(D);XP(k)
      • Threat
        • QAR1(E)
      • Vars
        • K(f);P-FLIGHT,P_SPINS(b)::R(B)
        • S(b);OGATE,XB(C)::R1(B)
        • S(g);N_GUARD,SBLOCK::B(C)
      • Refutation
        • S(g);CHECK,XP(D)
  • Actual
    • P(D);
    • Threat
      • QAR1(E)
    • Vars
      • K(f);P-FLIGHT,P_SPINS(b)::R(B)
      • S(b);OGATE,XB(C)::R1(B)
      • S(g);N_GUARD,SBLOCK::B(C)
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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).